Faculty Profiles - INAMI, Kenji

Papers - INAMI, Kenji

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Search for a Heavy Neutrino in τ Decays at Belle Reviewed

Vol. 131 ( 21 ) 2023.11

First Simultaneous Determination of Inclusive and Exclusive |Vub | Reviewed

Vol. 131 ( 21 ) 2023.11

Tests of Light-Lepton Universality in Angular Asymmetries of B0 →d∗-ℓν Decays Reviewed

Vol. 131 ( 18 ) 2023.11

Determination of |Vcb | using B ¯ 0 →D∗+ℓ- ν ¯ ℓ decays with Belle II Reviewed

Vol. 108 ( 9 ) 2023.11

Precise Measurement of the Ds+ Lifetime at Belle II Reviewed

Vol. 131 ( 17 ) 2023.10

Measurement of CP asymmetries in B0 →φ Ks0 decays with Belle II Reviewed

Vol. 108 ( 7 ) 2023.10

Measurement of Angular Coefficients of $\bar{B} \to D^* \ell \bar{\nu}_\ell$: Implications for $|V_{cb}|$ and Tests of Lepton Flavor Universality Reviewed

Markus Tobias Prim, Florian Bernlochner, Felix Metzner, Hiroaki Aihara, David Asner, Tagir Aushev, Rachid Ayad, Varghese Babu, swagato banerjee, Prafulla Kumar Behera, Konstantin Belous, Jake Bennett, Martin Bessner, V. Bhardwaj, BIPUL BHUYAN, Tadeas Bilka, Diptaparna Biswas, Denis Bodrov, Alexander Bondar, Jyotirmoi Borah, Marko Bračko, Paolo Branchini, Thomas E Browder, Antonio Budano, Marcello Campajola, Lu Cao, Daniel Červenkov, PAO-TI CHANG, ByungGu Cheon, S. -K. Choi, YOUNG-IL CHOI, Seema Choudhury, James Cochran, Sanjeeda Bharati Das, nibedita dash, Guglielmo De Nardo, Giacomo De Pietro, Rashmi Dhamija, Francesco Di Capua, Zdeněk Doležal, T. V. Dong, Shawn Dubey, Patrick Ecker, Denis Epifanov, Torben Ferber, Daniel Ferlewicz, Bryan FULSOM, Renu, Vipin Gaur, Anjan Giri, Pablo Goldenzweig, T. Gu, Kristina Gudkova, Christos Hadjivasiliou, Takanori HARA, Hisaki Hayashii, SAGAR HAZRA, Michael Thomas Hedges, Daniel Ricalde, Michel Enrique Hernández Villanueva, Wei-Shu Hou, Chia-Ling Hsu, Kenji Inami, Gianluca Inguglia, N Sushree Ipsita, A. Ishikawa, Ryosuke Itoh, Masako Iwasaki, W. W. Jacobs, Christian Kiesling, Cheolhun Kim, Doris Yangsoo Kim, Kyungho KIM, Peter Kodyš, Tomoyuki Konno, Alexandr Korobov, Samo Korpar, Evgeniy Kovalenko, Peter Križan, Pavel Krokovny, Thomas Kuhr, Manish Kumar, R.Kumar, Rajeev Kumar Sharma, Sharma R K, Young-Joon Kwon, Tommy Lam, Seungcheol Lee, Peter M Lewis, Longke Li, Luigi LI GIOI, James Libby, Dmitri Liventsev, Y. Ma, Tatsuro Matsuda, Dmitry Matvienko, Shubhangi Krishan Maurya, Frank Meier, Mario Merola, Kenkichi Miyabayashi, Roman Mizuk, Gagan B. Mohanty, isamu nakamura, Mikihiko Nakao, Devender Kumar, Zbigniew Natkaniec, Andrii Natochii, Lopamudra Nayak, Shohei Nishida, Hiroaki Ono, Pavel Oskin, Pavel Pakhlov, Galina Pakhlova, Seokhee Park, antonio passeri, Sourav Patra, Todd Pedlar, Rok Pestotnik, Leo Piilonen, Tomaž Podobnik, Elisabetta Prencipe, Markus Röhrken, N. Rout, Guido Russo, Saurabh Sandilya, Luka Santelj, Vladimir Savinov, Pascal Schmolz, Gunar Schnell, Christoph Schwanda, Yoshiaki Seino, Katsumi Senyo, Wei Shan, Jing-Ge Shiu, J.B. Singh, Elena Solovieva, Staric Marko, Zachary Stottler, Mizuki Sumihama, Makoto Takizawa, Kiyoshi Tanida, Francesco Tenchini, Rahul Tiwary, Karim Trabelsi, Yuuji Unno, SHOJI UNO, PHILLIP URQUIJO, Yuriy Usov, Sven Vahsen, Kevin Varvell, Anselm Vossen, MIN-ZU WANG, Xiaolong Wang, Eunil Won, Bruce Yabsley, Wenbiao Yan, Seongbae Yang, Junhao Yin, Li Yuan, Ziping Zhang, Victor Zhilich, Valentina Zhukova

Phys.Rev.Lett. Vol. 133 ( 13 ) page： 131801 - 131801 2023.10

Search for a τ+τ- Resonance in e+e- →μ+μ-τ+τ- Events with the Belle II Experiment Reviewed

Adachi I., Adamczyk K., Aggarwal L., Ahmed H., Aihara H., Akopov N., Aloisio A., Anh Ky N., Asner D.M., Atmacan H., Aushev T., Aushev V., Aversano M., Babu V., Bae H., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Baudot J., Bauer M., Baur A., Beaubien A., Becker J., Behera P.K., Bennett J.V., Bernieri E., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhardwaj V., Bhuyan B., Bianchi F., Bilka T., Bilokin S., Biswas D., Bobrov A., Bodrov D., Bolz A., Borah J., Bozek A., Bračko M., Branchini P., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Chekelian V., Chen Y.Q., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cinabro D., Cochran J., Corona L., Cremaldi L.M., Cunliffe S., Czank T., Das S., Dattola F., De La Cruz-Burelo E., De La Motte S.A., De Marino G., De Nardo G., De Nuccio M., De Pietro G., De Sangro R., Destefanis M., Dey S., De Yta-Hernandez A., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., DoleŽal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dort K., Dossett D., Dreyer S., Dubey S., Dujany G.

Physical Review Letters Vol. 131 ( 12 ) 2023.9

Language：English Publisher：Physical Review Letters

We report the first search for a nonstandard-model resonance decaying into τ pairs in e+e-→μ+μ-τ+τ- events in the 3.6-10 GeV/c2 mass range. We use a 62.8 fb-1 sample of e+e- collisions collected at a center-of-mass energy of 10.58 GeV by the Belle II experiment at the SuperKEKB collider. The analysis probes three different models predicting a spin-1 particle coupling only to the heavier lepton families, a Higgs-like spin-0 particle that couples preferentially to charged leptons (leptophilic scalar), and an axionlike particle, respectively. We observe no evidence for a signal and set exclusion limits at 90% confidence level on the product of cross section and branching fraction into τ pairs, ranging from 0.7 to 24 fb, and on the couplings of these processes. We obtain world-leading constraints on the couplings for the leptophilic scalar model for masses above 6.5 GeV/c2 and for the axionlike particle model over the entire mass range.

DOI： 10.1103/PhysRevLett.131.121802

Scopus

Measurement of CP Violation in B0 → KS0 π0 Decays at Belle II Reviewed

Adachi I., Adamczyk K., Aggarwal L., Ahmed H., Aihara H., Akopov N., Aloisio A., Anh Ky N., Asner D.M., Atmacan H., Aushev T., Aushev V., Aversano M., Babu V., Bae H., Bahinipati S., Bambade P., Banerjee S., Barrett M., Baudot J., Bauer M., Baur A., Beaubien A., Becker J., Behera P.K., Bennett J.V., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Bilka T., Biswas D., Bodrov D., Bondar A., Borah J., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang P., Cheaib R., Cheema P., Chekelian V., Chen C., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Corona L., Cremaldi L.M., Das S., Dattola F., De La Cruz-Burelo E., De La Motte S.A., De Marino G., De Nuccio M., De Pietro G., De Sangro R., Destefanis M., De Yta-Hernandez A., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., DoleŽal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dort K., Dreyer S., Dubey S., Dujany G., Ecker P., Eliachevitch M., Feichtinger P., Ferber T., Ferlewicz D., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F., Fulsom B.G., Gabrielli A.

Physical Review Letters Vol. 131 ( 11 ) 2023.9

Language：English Publisher：Physical Review Letters

We report a measurement of the CP-violating parameters C and S in B0→KS0π0 decays at Belle II using a sample of 387×106 BB¯ events recorded in e+e- collisions at a center-of-mass energy corresponding to the ϒ(4S) resonance. These parameters are determined by fitting the proper decay-time distribution of a sample of 415 signal events. We obtain C=-0.04-0.15+0.14±0.05 and S=0.75-0.23+0.20±0.04, where the first uncertainties are statistical and the second are systematic.

DOI： 10.1103/PhysRevLett.131.111803

Scopus

Evidence for B0 →p ς ¯ 0π- at Belle Reviewed

Chang C.Y., Wang M.Z., Adachi I., Aihara H., Said S.A., Asner D.M., Atmacan H., Aushev T., Ayad R., Babu V., Banerjee S., Bauer M., Behera P., Belous K., Bennett J., Bernlochner F., Bessner M., Bilka T., Biswas D., Bobrov A., Bodrov D., Bonvicini G., Borah J., Bozek A., Bračko M., Branchini P., Browder T.E., Budano A., Campajola M., Cao L., Červenkov D., Chang M.C., Cheon B.G., Chilikin K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choi Y., Choudhury S., Cinabro D., Das S., De Nardo G., De Pietro G., Dhamija R., Di Capua F., DoleŽal Z., Dong T.V., Dubey S., Ecker P., Ferber T., Ferlewicz D., Fulsom B.G., Gaur V., Garmash A., Giri A., Goldenzweig P., Graziani E., Gu T., Guan Y., Gudkova K., Hadjivasiliou C., Halder S., Hara T., Hayasaka K., Hayashii H., Hazra S., Hedges M.T., Herrmann D., Hou W.S., Hsu C.L., Inami K., Ipsita N., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Jacobs W.W., Jia S., Jin Y., Joo K.K., Kaliyar A.B., Kawasaki T., Kiesling C., Kim C.H., Kim D.Y., Kim K.H., Kim Y.K., Kinoshita K., Kodyš P., Konno T., Korobov A., Korpar S., Kovalenko E., KriŽan P., Krokovny P., Kuhr T., Kumar M., Kumara K., Kuzmin A.

Physical Review D Vol. 108 ( 5 ) 2023.9

Language：English Publisher：Physical Review D

We search for the B0→pς¯0π- decay with ς¯0→Λ¯γ, where the γ is not measured, using a data sample corresponding to an integrated luminosity of 711 fb-1 which contains 772×106 BB¯ pairs, collected around the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We measure for the first time the B0→pς¯0π- branching fraction to be B(B0→pς¯0π-)=(1.17-0.40+0.43(stat)±0.07(syst))×10-6 with a significance of 3.0σ. We simultaneously measure the branching fraction for the related channel B0→pΛ¯π- with much improved precision.

DOI： 10.1103/PhysRevD.108.052011

Scopus

Measurement of CP asymmetries and branching-fraction ratios for B± → DK± and Dπ± with D → KS0 K± π∓ using Belle and Belle II data Reviewed

Adachi I., Aggarwal L., Aihara H., Akopov N., Aloisio A., Anh Ky N., Asner D.M., Aushev T., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Bahinipati S., Bambade P., Banerjee S., Barrett M., Baudot J., Bauer M., Baur A., Beaubien A., Becker J., Behera P.K., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Bilka T., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Borah J., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Chekelian V., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Choi S.K., Choi Y., Choudhury S., Cochran J., Corona L., Cremaldi L.M., Das S., Dattola F., De La Cruz-Burelo E., De La Motte S.A., De Nardo G., De Nuccio M., De Pietro G., de Sangro R., Destefanis M., Dey S., De Yta-Hernandez A., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., Doležal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dort K., Dreyer S., Dubey S., Dujany G., Ecker P., Epifanov D., Feichtinger P., Ferber T., Ferlewicz D., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F.

Journal of High Energy Physics Vol. 2023 ( 9 ) 2023.9

Language：English Publisher：Journal of High Energy Physics

We measure CP asymmetries and branching-fraction ratios for B± → DK± and Dπ± decays with D → KS0 K± π∓, where D is a superposition of D0 and D¯0. We use the full data set of the Belle experiment, containing 772 × 106 BB¯ pairs, and data from the Belle II experiment, containing 387 × 106 BB¯ pairs, both collected in electron-positron collisions at the Υ(4S) resonance. Our results provide model-independent information on the unitarity triangle angle ϕ 3. [Figure not available: see fulltext.]

DOI： 10.1007/JHEP09(2023)146

Scopus

Search for Bs0 → ℓ∓ τ± with the semi-leptonic tagging method at Belle Reviewed

Nayak L., Nishida S., Giri A., Adachi I., Aihara H., Asner D.M., Atmacan H., Aulchenko V., Aushev T., Ayad R., Babu V., Bahinipati S., Banerjee S., Bauer M., Behera P., Belous K., Bennett J., Bessner M., Bhuyan B., Biswas D., Bodrov D., Borah J., Bozek A., Bračko M., Branchini P., Browder T.E., Budano A., Campajola M., Červenkov D., Chang M.C., Cheon B.G., Chilikin K., Cho H.E., Cho K., Choi S.K., Choi Y., Choudhury S., Cinabro D., Cochran J., Das S., Dash N., De Nardo G., De Pietro G., Dhamija R., Di Capua F., Dingfelder J., Doležal Z., Dong T.V., Dossett D., Dubey S., Epifanov D., Ferber T., Ferlewicz D., Fulsom B.G., Garg R., Gaur V., Goldenzweig P., Graziani E., Gu T., Guan Y., Halder S., Hara T., Hayasaka K., Hayashii H., Hedges M.T., Herrmann D., Hou W.S., Hsu C.L., Iijima T., Inami K., Inguglia G., Ipsita N., Ishikawa A., Itoh R., Iwasaki M., Jacobs W.W., Jang E.J., Jia S., Jin Y., Joo K.K., Kaliyar A.B., Kawasaki T., Kiesling C., Kim C.H., Kim D.Y., Kim K.H., Kim Y.K., Kinoshita K., Kodyš P., Konno T., Korobov A., Korpar S., Kovalenko E., Križan P., Krokovny P., Kuhr T., Kumar M., Kumar R., Kumara K., Kuzmin A.

Journal of High Energy Physics Vol. 2023 ( 8 ) 2023.9

Language：English Publisher：Journal of High Energy Physics

We present a search for the lepton-flavor-violating decays Bs0 → ℓ∓ τ±, where ℓ = e, μ, using the full data sample of 121 fb−1 collected at the Υ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e− collider. We use Bs0B¯s0 events in which one Bs0 meson is reconstructed in a semileptonic decay mode and the other in the signal mode. We find no evidence for Bs0 → ℓ∓ τ± decays and set upper limits on their branching fractions at 90% confidence level as B (Bs0 → e∓ τ±) < 14 × 10−4 and B (Bs0 → μ∓ τ±) < 7.3 × 10−4. Our result represents the first upper limit on the Bs0 → e∓ τ± decay rate. [Figure not available: see fulltext.]

DOI： 10.1007/JHEP08(2023)178

Scopus

Measurement of the e+e− → $$ {B}_s^0{\overline{B } }_s^0X $$ cross section in the energy range from 10.63 to 11.02 GeV using inclusive $$ {D}_s^{+} $$ and D0 production Reviewed

V. Zhukova, R. Mizuk, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, Sw. Banerjee, M. Bauer, P. Behera, K. Belous, J. Bennett, F. Bernlochner, M. Bessner, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, A. Bondar, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, M.-C. Chang, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Das, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, T. V. Dong, S. Dubey, P. Ecker, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, T. Gu, K. Gudkova, C. Hadjivasiliou, T. Hara, K. Hayasaka, S. Hazra, M. T. Hedges, D. Herrmann, W.-S. Hou, C.-L. Hsu, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, M. Kumar, R. Kumar, A. Kuzmin, Y.-J. Kwon, Y.-T. Lai, T. Lam, M. Laurenza, S. C. Lee, D. Levit, L. K. Li, J. Libby, K. Lieret, D. Liventsev, Y. Ma, M. Masuda, T. Matsuda, S. K. Maurya, F. Meier, M. Merola, F. Metzner, K. Miyabayashi, G. B. Mohanty, I. Nakamura, T. Nakano, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, N. K. Nisar, S. Nishida, K. Ogawa, S. Ogawa, H. Ono, P. Oskin, P. Pakhlov, G. Pakhlova, T. Pang, S. Pardi, H. Park, J. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, E. Prencipe, M. T. Prim, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, L. Santelj, V. Savinov, G. Schnell, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, W. Shan, M. Shapkin, C. Sharma, J.-G. Shiu, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, M. Sumihama, W. Sutcliffe, M. Takizawa, K. Tanida, F. Tenchini, R. Tiwary, K. Trabelsi, M. Uchida, Y. Unno, S. Uno, Y. Usov, S. E. Vahsen, G. Varner, A. Vinokurova, D. Wang, E. Wang, M.-Z. Wang, X. L. Wang, M. Watanabe, S. Watanuki, O. Werbycka, E. Won, B. D. Yabsley, W. Yan, J. H. Yin, C. Z. Yuan, L. Yuan, Z. P. Zhang, V. Zhilich

Journal of High Energy Physics Vol. 2023 ( 8 ) 2023.8

Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

We report the first measurement of the inclusive e+e−→$$ b\overline{b} $$→$$ {D}_s^{\pm } $$X and e+e−→$$ b\overline{b} $$→ D0/$$ {\overline{D } }^0 $$X cross sections in the energy range from 10.63 to 11.02 GeV. Based on these results, we determine σ(e+e−→$$ {B}_s^0{\overline{B } }_s^0 $$X) and σ(e+e−→$$ B\overline{B} $$X) in the same energy range. We measure the fraction of $$ {B}_s^0 $$ events at Υ(10860) to be fs = ($$ {22.0}_{-2.1}^{+2.0} $$)%. We determine also the ratio of the $$ {B}_s^0 $$ inclusive branching fractions $$ \mathcal{B} $$($$ {B}_s^0 $$→ D0/$$ {\overline{D } }^0 $$X)/$$ \mathcal{B} $$($$ {B}_s^0 $$→$$ {D}_s^{\pm } $$X) = 0.416 ± 0.018 ± 0.092. The results are obtained using the data collected with the Belle detector at the KEKB asymmetric-energy e+e− collider.

DOI： 10.1007/jhep08(2023)131

Other Link： https://link.springer.com/article/10.1007/JHEP08(2023)131/fulltext.html

Measurement of differential distributions of B →d∗ℓ ν ¯ ℓ and implications on |Vcb | Reviewed

Prim M.T., Bernlochner F., Metzner F., Lieret K., Kuhr T., Adachi I., Aihara H., Said S.A., Asner D.M., Atmacan H., Aulchenko V., Aushev T., Ayad R., Babu V., Bahinipati S., Banerjee S., Bauer M., Behera P., Bennett J., Bessner M., Bhardwaj V., Bhuyan B., Bilka T., Biswas D., Bodrov D., Borah J., Bozek A., Bračko M., Branchini P., Browder T.E., Budano A., Campajola M., Cao L., Červenkov D., Chang M.C., Chekelian V., Cheon B.G., Chilikin K., Cho H.E., Cho K., Choi Y., Choudhury S., Cinabro D., Das S., Dash N., De Marino G., De Nardo G., De Pietro G., Dhamija R., Di Capua F., Dingfelder J., DoleŽal Z., Dong T.V., Epifanov D., Ferber T., Ferlewicz D., Frey A., Fulsom B.G., Gaur V., Garmash A., Giri A., Goldenzweig P., Graziani E., Gu T., Gudkova K., Hadjivasiliou C., Halder S., Hara T., Hayasaka K., Hayashii H., Hedges M.T., Herrmann D., Hernández Villanueva M., Hsu C.L., Iijima T., Inami K., Inguglia G., Ipsita N., Ishikawa A., Itoh R., Iwasaki M., Jacobs W.W., Jang E.J., Jia S., Jin Y., Joo K.K., Kaliyar A.B., Kang K.H., Kawasaki T., Kiesling C., Kim C.H., Kim D.Y., Kim K.H., Kim Y.K., Kinoshita K., Kodyš P., Konno T., Korobov A., Korpar S., Kovalenko E.

Physical Review D Vol. 108 ( 1 ) 2023.7

Language：English Publisher：Physical Review D

We present a measurement of the differential shapes of exclusive B→D∗ℓν¯ℓ (B=B-,B¯0 and ℓ=e, μ) decays with hadronic tag-side reconstruction for the full 711 fb-1 Belle dataset. We extract the Caprini-Lellouch-Neubert (CLN) and Boyd-Grinstein-Lebed (BGL) form factor parameters and use an external input for the absolute branching fractions to determine the Cabibbo-Kobayashi-Maskawa matrix element and find |Vcb|CLN=(40.2±0.9)×10-3 and |Vcb|BGL=(40.7±1.0)×10-3 with the zero-recoil lattice QCD point F(1)=0.906±0.013. We also perform a study of the impact of beyond zero-recoil lattice QCD calculations on the |Vcb| determinations. Additionally, we present the lepton-flavor universality ratio Reμ=B(B→D∗eν¯e)/B(B→D∗μν¯μ)=0.993±0.023±0.023, the electron and muon forward-backward asymmetry and their difference ΔAFB=0.028±0.028±0.008, and the electron and muon D∗ longitudinal polarization fraction and their difference ΔFLD∗=0.030±0.025±0.007. The uncertainties quoted correspond to the statistical and systematic uncertainties, respectively.

DOI： 10.1103/PhysRevD.108.012002

Scopus

Search for an Invisible Z′ in a Final State with Two Muons and Missing Energy at Belle II Reviewed

Adachi I., Adamczyk K., Aggarwal L., Ahmed H., Aihara H., Akopov N., Aloisio A., Anh Ky N., Asner D.M., Aushev T., Aushev V., Bae H., Bahinipati S., Bambade P., Banerjee S., Baudot J., Bauer M., Baur A., Beaubien A., Becker J., Behera P.K., Bennett J.V., Bernieri E., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Bilka T., Biswas D., Bodrov D., Bolz A., Borah J., Bozek A., Bračko M., Branchini P., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Chang M.C., Chang P., Cheaib R., Cheema P., Chekelian V., Chen C., Chen Y.Q., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cinabro D., Corona L., Cunliffe S., Das S., Dattola F., De La Cruz-Burelo E., De La Motte S.A., De Nardo G., De Nuccio M., De Pietro G., De Sangro R., Destefanis M., Dey S., De Yta-Hernandez A., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., DoleŽal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dort K., Dossett D., Dreyer S., Dubey S., Dujany G., Ecker P., Eliachevitch M., Epifanov D., Feichtinger P., Ferber T., Ferlewicz D., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F., Fulsom B.G.

Physical Review Letters Vol. 130 ( 23 ) 2023.6

Language：English Publisher：Physical Review Letters

The Lμ-Lτ extension of the standard model predicts the existence of a lepton-flavor-universality-violating Z′ boson that couples only to the heavier lepton families. We search for such a Z′ through its invisible decay in the process e+e-→μ+μ-Z′. We use a sample of electron-positron collisions at a center-of-mass energy of 10.58 GeV collected by the Belle II experiment in 2019-2020, corresponding to an integrated luminosity of 79.7 fb-1. We find no excess over the expected standard-model background. We set 90%-confidence-level upper limits on the cross section for this process as well as on the coupling of the model, which ranges from 3×10-3 at low Z′ masses to 1 at Z′ masses of 8 GeV/c2.

DOI： 10.1103/PhysRevLett.130.231801

Scopus

Study of the lineshape of X (3872) using B decays to D0 D ¯ ∗0K Reviewed

Hirata H., Iijima T., Kato Y., Tanida K., Adachi I., Ahn J.K., Aihara H., Al Said S., Asner D.M., Atmacan H., Aushev T., Ayad R., Babu V., Banerjee S., Behera P., Belous K., Bennett J., Bessner M., Bhardwaj V., Bhuyan B., Bilka T., Biswas D., Bobrov A., Bodrov D., Borah J., Bozek A., Bračko M., Branchini P., Browder T.E., Budano A., Campajola M., Červenkov D., Chang M.C., Chang P., Cheon B.G., Chilikin K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choi Y., Choudhury S., Cinabro D., Cunliffe S., Das S., De Marino G., De Nardo G., De Pietro G., Dhamija R., Di Capua F., Dingfelder J., DoleŽal Z., Dong T.V., Epifanov D., Ferber T., Ferlewicz D., Fulsom B.G., Gaur V., Garmash A., Giri A., Goldenzweig P., Graziani E., Gudkova K., Hadjivasiliou C., Halder S., Hara T., Hayasaka K., Hayashii H., Hedges M.T., Herrmann D., Hou W.S., Hsu C.L., Inami K., Ipsita N., Ishikawa A., Itoh R., Iwasaki M., Jacobs W.W., Jang E.J., Jia S., Jin Y., Kalita D., Kiesling C., Kim C.H., Kim D.Y., Kim K.H., Kim Y.K., Kinoshita K., Kodyš P., Konno T., Korobov A., Korpar S., Kovalenko E., KriŽan P., Krokovny P., Kuhr T., Kumar R., Kumara K., Kuzmin A., Kwon Y.J.

Physical Review D Vol. 107 ( 11 ) 2023.6

Language：English Publisher：Physical Review D

We present a study of the X(3872) lineshape in the decay B→X(3872)K→D0D¯∗0K using a data sample of 772×106 BB¯ pairs collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The peak near the threshold in the D0D¯∗0 invariant mass spectrum is fitted using a relativistic Breit-Wigner lineshape. We determine the mass and width parameters to be mBW=3873.71-0.50+0.56(stat)±0.13(syst) MeV/c2 and ΓBW=5.2-1.5+2.2(stat)±0.4(syst) MeV, respectively. The branching fraction is found to be B(B+→X(3872)K+)×B(X(3872)→D0D¯∗0)=(0.97-0.18+0.21(stat)±0.10(syst))×10-4. The signal from B0 decays is observed for the first time with 5.2σ significance, and the ratio of branching fractions between charged and neutral B decays is measured to be B(B0→X(3872)K0)/B(B+→X(3872)K+)=1.34-0.40+0.47(stat)-0.12+0.10(syst). The peak is also studied using a Flatté lineshape. We determine the lower limit on the DD¯∗ coupling constant g to be 0.075 at 95% credibility in the parameter region where the ratio of g to the mass difference from the D0D¯∗0 threshold is equal to -15.11 GeV-1, as measured by LHCb.

DOI： 10.1103/PhysRevD.107.112011

Scopus

Measurement of the branching fraction and CP asymmetry of B0 →π0π0 decays using 198×106 B B ¯ pairs in Belle II data Reviewed

Abudinén F., Adachi I., Adamczyk K., Aggarwal L., Ahmed H., Aihara H., Akopov N., Aloisio A., Anh Ky N., Asner D.M., Atmacan H., Aushev T., Aushev V., Bae H., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Baudot J., Bauer M., Baur A., Beaubien A., Becker J., Behera P.K., Bennett J.V., Bernieri E., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhardwaj V., Bhuyan B., Bianchi F., Bilka T., Bilokin S., Biswas D., Bodrov D., Bolz A., Borah J., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Chang M.C., Chang P., Cheaib R., Cheema P., Chekelian V., Chen C., Chen Y.Q., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cinabro D., Cochran J., Corona L., Cunliffe S., Das S., Dattola F., De La Cruz-Burelo E., De La Motte S.A., De Marino G., De Nardo G., De Nuccio M., De Pietro G., De Sangro R., Destefanis M., Dey S., De Yta-Hernandez A., Dhamija R., Di Canto A., Di Capua F., DoleŽal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dort K., Dossett D., Dreyer S., Dubey S., Dujany G., Ecker P., Eliachevitch M., Feichtinger P., Ferber T.

Physical Review D Vol. 107 ( 11 ) 2023.6

Language：English Publisher：Physical Review D

We report measurements of the branching fraction and CP asymmetry in B0→π0π0 decays reconstructed at Belle II in an electron-positron collision sample containing 198×106 BB¯ pairs. We measure a branching fraction B(B0→π0π0)=(1.38±0.27±0.22)×10-6 and a CP asymmetry ACP(B0→π0π0)=0.14±0.46±0.07, where the first uncertainty is statistical and the second is systematic.

DOI： 10.1103/PhysRevD.107.112009

Scopus

Novel method for the identification of the production flavor of neutral charmed mesons Reviewed

Adachi I., Aggarwal L., Ahmed H., Aihara H., Akopov N., Aloisio A., Anh Ky N., Asner D.M., Atmacan H., Aushev T., Aushev V., Aversano M., Babu V., Bae H., Bahinipati S., Bambade P., Banerjee S., Barrett M., Baudot J., Bauer M., Baur A., Beaubien A., Becker J., Behera P.K., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Bilka T., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Borah J., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Chekelian V., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Corona L., Cremaldi L.M., Das S., Dattola F., De La Cruz-Burelo E., De La Motte S.A., De Nardo G., De Nuccio M., De Pietro G., De Sangro R., Destefanis M., De Yta-Hernandez A., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., DoleŽal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dort K., Dreyer S., Dubey S., Dujany G., Ecker P., Eliachevitch M., Feichtinger P., Ferber T., Ferlewicz D., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F., Frey A.

Physical Review D Vol. 107 ( 11 ) 2023.6

Language：English Publisher：Physical Review D

We propose a new algorithm for the identification of the production flavor of neutral D mesons in the Belle II experiment. The algorithm exploits the correlation between the flavor of a reconstructed neutral D meson (signal D meson) and the electric charges of particles reconstructed in the rest of the e+e-→cc¯ event. These include those originating from the decay of the other charm hadron produced in the event, as well as those possibly produced in association with the signal D meson. We develop the algorithm using simulation and calibrate it in data using decay modes that identify the flavor of the decaying neutral D meson. We use a data sample of e+e- collisions, corresponding to 362 fb-1 of integrated luminosity, collected by Belle II at center-of-mass energies near the γ(4S) mass. The effective tagging efficiency in data is (47.91±0.07(stat)±0.51(syst))%, independent of the neutral-D-meson decay mode. This charm flavor tagger will approximately double the effective sample size of many CP-violation and charm-mixing measurements that so far have exclusively relied on neutral D mesons originating from D∗± decays. While developed for Belle II, the basic principles underlying the charm flavor tagger can be used in other experiments, including those at hadron colliders.

DOI： 10.1103/PhysRevD.107.112010

Scopus

Search for lepton-flavor-violating τ decays into a lepton and a vector meson using the full Belle data sample Reviewed International coauthorship

N. Tsuzuki, K. Inami, I. Adachi, H. Aihara, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, Sw Banerjee, P. Behera, K. Belous, J. Bennett, M. Bessner, B. Bhuyan, T. Bilka, D. Biswas, D. Bodrov, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M. C. Chang, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S. J. Cho, S. K. Choi, Y. Choi, S. Choudhury, D. Cinabro, J. Cochran, S. Das, N. Dash, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Doležal, T. V. Dong, D. Dossett, S. Dubey, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, V. Gaur, A. Giri, P. Goldenzweig, Y. Guan, K. Gudkova, X. Han, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, D. Herrmann, W. S. Hou, C. L. Hsu, T. Iijima, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, E. J. Jang, S. Jia, Y. Jin, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K. H. Kim, Y. K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, P. Krokovny, M. Kumar, K. Kumara, A. Kuzmin, Y. J. Kwon, S. C. Lee, J. Li, L. K. Li, Y. Li, J. Libby, K. Lieret, Y. R. Lin, D. Liventsev, Y. Ma

Journal of High Energy Physics Vol. 2023 ( 6 ) 2023.6

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Charged-lepton-flavor-violation is predicted in several new physics scenarios. We update the analysis of τ lepton decays into a light charged lepton (ℓ = e ± or μ ±) and a vector meson (V 0 = ρ 0, ϕ, ω, K *0, or K¯ *0) using 980 fb−1 of data collected with the Belle detector at the KEKB collider. No significant excess of such signal events is observed, and thus 90% credibility level upper limits are set on the τ → ℓV 0 branching fractions in the range of (1.7–4.3) × 10−8. These limits are improved by 30% on average from the previous results. [Figure not available: see fulltext.].

DOI： 10.1007/JHEP06(2023)118

Scopus

Two-particle angular correlations in e + e − collisions to hadronic final states in two reference coordinates at Belle Reviewed

Chen, Y.-C., Lee, Y.-J., Chang, P., Adachi, I., Aihara, H., Al Said, S., Asner, D.M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Behera, P., Belous, K., Bennett, J., Bessner, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Bodrov, D., Bonvicini, G., Borah, J., Bozek, A., Bra?ko, M., Branchini, P., Budano, A., Campajola, M., ?ervenkov, D., Chang, M.-C., Chekelian, V., Cheon, B.G., Chilikin, K., Cho, H.E., Cho, K., Cho, S.-J., Choi, S.-K., Choi, Y., Choudhury, S., Cinabro, D., Das, S., De Pietro, G., Dhamija, R., Di Capua, F., Dingfelder, J., Dole?al, Z., Dong, T.V., Epifanov, D., Ferber, T., Ferlewicz, D., Fulsom, B.G., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Giri, A., Goldenzweig, P., Graziani, E., Gu, T., Hadjivasiliou, C., Hayasaka, K., Hayashii, H., Hedges, M.T., Herrmann, D., Hou, W.-S., Hsu, C.-L., Inami, K., Ipsita, N., Ishikawa, A., Itoh, R., Iwasaki, M., Jacobs, W.W., Jang, E.-J., Jia, S., Jin, Y., Joo, K.K., Kang, K.H., Karyan, G., Kawasaki, T., Kiesling, C., Kim, C.H., Kim, D.Y., Kim, K.-H., Kim, Y.-K., Kody?, P., Korobov, A., Korpar, S., Kovalenko, E., Kri?an, P., Krokovny, P., Kumar, M., Kumar, R., Kumara, K., Kwon, Y.-J., Lam, T., Lange, J.S., Lee, S.C., Li, J., Li, L.K., Li, Y., Li, Y.B., Gioi, L.L., Libby, J., Lin, C.-W., Lieret, K., Liventsev, D., Masuda, M., Matsuda, T., Maurya, S.K., Meier, F., Merola, M., Miyabayashi, K., Mizuk, R., Mohanty, G.B., Mrvar, M., Mussa, R., Nakao, M., Natkaniec, Z., Natochii, A., Nayak, M., Nisar, N.K., Nishida, S., Ogawa, S., Ono, H., Onuki, Y., Oskin, P., Pakhlova, G., Pardi, S., Park, H., Park, S.-H., Patra, S., Paul, S., Pedlar, T.K., Pestotnik, R., Piilonen, L.E., Podobnik, T., Prencipe, E., Prim, M.T., Rout, N., Russo, G., S, ilya, S., Sangal, A., Santelj, L., Savinov, V., Schnell, G., Schw, a, C., Seidl, R., Seino, Y., Senyo, K., Sevior, M.E., Shapkin, M., Sharma, C., Shen, C.P., Shiu, J.-G., Solovieva, E., Stari?, M., Stottler, Z.S., Strube, J.F., Sumihama, M., Sumiyoshi, T., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Trabelsi, K., Uchida, M., Uglov, T., Unno, Y., Uno, K., Uno, S., Urquijo, P., van Tonder, R., Varner, G., Vinokurova, A., Vossen, A., Waheed, E., Wang, E., Wang, M.-Z., Wang, X.L., Watanabe, M., Watanuki, S., Won, E., Yan, W., Yang, S.B., Yin, J.H., Yuan, C.Z., Yusa, Y., Zhai, Y., Zhang, Z.P., Zhilich, V., Zhukova, V.

Journal of High Energy Physics Vol. 2023 ( 3 ) 2023

Language：English Publishing type：Research paper (scientific journal)

We present the analysis of two-particle angular correlations using coordinate systems defined with the conventional beam axis and the event thrust axis. We propose the latter as a good representation for the correlation structure interpretation in the e+e− collision system. The e+e− collisions to hadronic final states at center-of-mass energies of s = 10.52 GeV and 10.58 GeV are recorded by the Belle detector at KEKB. In this paper, results on the first dataset are supplementary to the previous Belle publication [1]. At the same time, the latter is the first two-particle correlation measurement at collision energy on the Υ(4S) resonance and is sensitive to its decay products. Measurements are reported as a function of the charged-particle multiplicity. Finally, a qualitative understanding of the correlation structure is discussed using a combination of Monte Carlo simulations and experimental data. [Figure not available: see fulltext.].

DOI： 10.1007/JHEP03(2023)171

Scopus

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