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Article ; Online: First Measurement of the Michel Parameter ξ^{'} in the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} Decay at Belle.

Bodrov, D / Pakhlov, P / Adachi, I / Aihara, H / Said, S Al / Asner, D M / Atmacan, H / Aushev, T / Ayad, R / Babu, V / Banerjee, Sw / Behera, P / Belous, K / Bennett, J / Bessner, M / Bhuyan, B / Bilka, T / Biswas, D / Bobrov, A /

Bondar, A / 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 / 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 / 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 / Greenwald, D / Gu, T / Guan, Y / Gudkova, K / Hadjivasiliou, C / Halder, S / Hayasaka, K / Hayashii, H / Hedges, M T / Herrmann, D / Hou, W-S / Hsu, C-L / Iijima, T / Inami, K / Ipsita, N / Ishikawa, A / Itoh, R / Iwasaki, M / Jacobs, W W / Jang, E-J / Ji, Q P / Jia, S / Jin, Y / Joo, K K / Kalita, D / Kaliyar, A B / Kawasaki, T / Kiesling, C / Kim, C H / Kim, D Y / Kim, K-H / Kim, Y-K / Kindo, H / Kinoshita, K / Kodyš, P / Korpar, S / Križan, P / Krokovny, P / Kuhr, T / Kumar, M / Kumar, R / Kumara, K / Kwon, Y-J / Lange, J S / Lee, S C / Li, J / Li, L K / Libby, J / Lieret, K / Lin, Y-R / Liventsev, D / Luo, T / Ma, Y / Masuda, M / Matsuda, T / Maurya, S K / Meier, F / Merola, M / Metzner, F / Miyabayashi, K / Mizuk, R / Mohanty, G B / Mussa, R / Nakao, M / Narwal, D / Natkaniec, Z / Natochii, A / Nayak, L / Nayak, M / Nisar, N K / Nishida, S / Ogawa, S / Oskin, P / Pakhlova, G / Pardi, S / Park, H / Park, J / Park, S-H / Passeri, A / Patra, S / Paul, S / Pestotnik, R / Piilonen, L E / Podobnik, T / Prencipe, E / Prim, M T / Rabusov, A / Rout, N / Russo, G / Sandilya, S / Sangal, A / Santelj, L / Savinov, V / Schnell, G / Schwanda, C / Seino, Y / Senyo, K / Shan, W / Shapkin, M / Sharma, C / Shiu, J-G / Singh, J B / Sokolov, A / Solovieva, E / Starič, M / Stottler, Z S / Sumihama, M / Takizawa, M / Tamponi, U / Tanida, K / Tenchini, F / Tiwary, R / Trabelsi, K / Uchida, M / Uglov, T / Unno, Y / Uno, K / Uno, S / Vahsen, S E / Varner, G / Vinokurova, A / Vossen, A / Wang, D / Wang, E / Wang, M-Z / Watanuki, S / Werbycka, O / Xu, X / Yabsley, B D / Yan, W / Yang, S B / Yelton, J / Yin, J H / Yuan, C Z / Yusa, Y / Zhang, Z P / Zhilich, V / Zhukova, V

Physical review letters

2023 Volume 131, Issue 2, Page(s) 21801

Abstract: We report the first measurement of the Michel parameter ξ^{'} in the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} decay with a new method proposed just recently. The measurement is based on the reconstruction of the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} events with subsequent ... ...

Abstract	We report the first measurement of the Michel parameter ξ^{'} in the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} decay with a new method proposed just recently. The measurement is based on the reconstruction of the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} events with subsequent muon decay in flight in the Belle central drift chamber. The analyzed data sample of 988 fb^{-1} collected by the Belle detector corresponds to approximately 912×10^{6} τ^{+}τ^{-} pairs. We measure ξ^{'}=0.22±0.94(stat)±0.42(syst), which is in agreement with the standard model prediction of ξ^{'}=1. Statistical uncertainty dominates in this study, being a limiting factor, while systematic uncertainty is well under control. Our analysis proved the practicability of this promising method and its prospects for further precise measurement in future experiments.
Language	English
Publishing date	2023-07-28
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.131.021801
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Search for a Light Higgs Boson in Single-Photon Decays of ϒ(1S) Using ϒ(2S)→π^{+}π^{-}ϒ(1S) Tagging Method.

Jia, S / Shen, C P / Adachi, I / Aihara, H / Al Said, S / Asner, D M / Atmacan, H / Aushev, T / Ayad, R / Babu, V / Behera, P / Belous, K / Bennett, J / Bessner, M / Bhardwaj, V / Bhuyan, B / Bilka, T / Bobrov, A / Bodrov, D /

Bonvicini, G / Borah, J / Bračko, M / Branchini, P / Browder, T E / Budano, A / Campajola, M / Červenkov, D / Chang, M-C / Chang, P / Chekelian, V / Chen, A / 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 / Dash, N / De Nardo, G / De Pietro, G / Dhamija, R / Di Capua, F / Doležal, Z / Dong, T V / Epifanov, D / Ferber, T / Ferlewicz, D / Fulsom, B G / Garg, R / Gaur, V / Gabyshev, N / Giri, A / Goldenzweig, P / Golob, B / Graziani, E / Guan, Y / Gudkova, K / Hadjivasiliou, C / Hara, T / Hayasaka, K / Hayashii, H / Hedges, M T / Hou, W-S / Inami, K / Inguglia, G / Ishikawa, A / Itoh, R / Iwasaki, M / Iwasaki, Y / Jacobs, W W / Jang, E-J / Jin, Y / Joo, K K / Kahn, J / 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 / Kohani, S / Konno, T / Korobov, A / Korpar, S / Kovalenko, E / Križan, P / Kroeger, R / Krokovny, P / Kumar, M / Kumar, R / Kumara, K / Kwon, Y-J / Lam, T / Laurenza, M / Lee, S C / Li, J / Li, L K / Li, Y / Li, Y B / Li Gioi, L / Libby, J / Lieret, K / Liventsev, D / Martini, A / Masuda, M / Matsuda, T / Matvienko, D / Maurya, S K / Meier, F / Merola, M / Metzner, F / Miyabayashi, K / Mizuk, R / Mohanty, G B / Mussa, R / Nakao, M / Narwal, D / Natkaniec, Z / Natochii, A / Nayak, L / Nisar, N K / Nishida, S / Nishimura, K / Ogawa, K / Ogawa, S / Ono, H / Oskin, P / Pakhlov, P / Pakhlova, G / Pang, T / Pardi, S / Park, S-H / Patra, S / Paul, S / Pedlar, T K / Pestotnik, R / Piilonen, L E / Podobnik, T / Prencipe, E / Prim, M T / Röhrken, M / Rostomyan, A / Rout, N / Russo, G / Sahoo, D / Sandilya, S / Sangal, A / Santelj, L / Sanuki, T / Savinov, V / Schnell, G / Schueler, J / Schwanda, C / Seino, Y / Senyo, K / Sevior, M E / Shapkin, M / Sharma, C / Shebalin, V / Shiu, J-G / Shwartz, B / Singh, J B / Sokolov, A / Solovieva, E / Stanič, S / Starič, M / Stottler, Z S / Sumihama, M / Sumisawa, K / Sumiyoshi, T / Sutcliffe, W / Takizawa, M / Tamponi, U / Tanida, K / Tenchini, F / Trabelsi, K / Uchida, M / Uehara, S / Uglov, T / Unno, Y / Uno, K / Uno, S / Urquijo, P / Vahsen, S E / Van Tonder, R / Varner, G / Vinokurova, A / Waheed, E / Wang, D / Wang, E / Wang, M-Z / Watanuki, S / Won, E / Yabsley, B D / Yan, W / Yang, S B / Ye, H / Yelton, J / Yin, J H / Yusa, Y / Zhai, Y / Zhang, Z P / Zhilich, V / Zhukova, V

Physical review letters

2022 Volume 128, Issue 8, Page(s) 81804

Abstract: We search for a light Higgs boson (A^{0}) decaying into a τ^{+}τ^{-} or μ^{+}μ^{-} pair in the radiative decays of ϒ(1S). The production of ϒ(1S) mesons is tagged by ϒ(2S)→π^{+}π^{-}ϒ(1S) transitions, using 158×10^{6} ϒ(2S) events accumulated with the ... ...

Abstract	We search for a light Higgs boson (A^{0}) decaying into a τ^{+}τ^{-} or μ^{+}μ^{-} pair in the radiative decays of ϒ(1S). The production of ϒ(1S) mesons is tagged by ϒ(2S)→π^{+}π^{-}ϒ(1S) transitions, using 158×10^{6} ϒ(2S) events accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant A^{0} signals in the mass range from the τ^{+}τ^{-} or μ^{+}μ^{-} threshold to 9.2 GeV/c^{2} are observed. We set the upper limits at 90% credibility level (C.L.) on the product branching fractions for ϒ(1S)→γA^{0} and A^{0}→τ^{+}τ^{-} varying from 3.8×10^{-6} to 1.5×10^{-4}. Our results represent an approximately twofold improvement on the current world best upper limits for the ϒ(1S)→γA^{0}(→τ^{+}τ^{-}) production. For A^{0}→μ^{+}μ^{-}, the upper limits on the product branching fractions for ϒ(1S)→γA^{0} and A^{0}→μ^{+}μ^{-} are at the same level as the world average limits, and vary from 3.1×10^{-7} to 1.6×10^{-5}. The upper limits at 90% credibility level on the Yukawa coupling f_{ϒ(1S)} and mixing angle sinθ_{A^{0}} are also given.
Language	English
Publishing date	2022-03-11
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.128.081804
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Test of Light-Lepton Universality in the Rates of Inclusive Semileptonic B-Meson Decays at Belle II.

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, Sw / Bansal, S / Barrett, M / Baudot, J / Bauer, M / Baur, A /

Beaubien, A / Becker, J / 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 / Borah, J / Bozek, A / Bračko, M / Briere, R A / Browder, T E / Budano, A / Bussino, S / Campajola, M / Cao, L / Casarosa, G / Cecchi, C / Cerasoli, J / Chang, M-C / 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 / Cochran, J / Corona, L / Cunliffe, 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 / Dhamija, R / Di Capua, F / Dingfelder, J / Doležal, Z / Dong, T V / Dorigo, M / Dossett, D / Dreyer, S / Dubey, S / Dujany, G / Ecker, P / Eliachevitch, M / Feichtinger, P / Ferber, T / Ferlewicz, D / Fillinger, T / Finocchiaro, G / Fodor, A / Forti, F / Frey, A / Fulsom, B G / Gabrielli, A / Ganiev, E / Garcia-Hernandez, M / Gaudino, G / Gaur, V / Gaz, A / Gellrich, A / Ghevondyan, G / Giordano, R / Giri, A / Glazov, A / Gobbo, B / Godang, R / Goldenzweig, P / Gradl, W / Grammatico, T / Granderath, S / Graziani, E / Gruberová, Z / Gu, T / Gudkova, K / Halder, S / Hara, T / Hayasaka, K / Hayashii, H / Hazra, S / Hearty, C / Hedges, M T / Heredia de la Cruz, I / Hernández Villanueva, M / Hershenhorn, A / Higuchi, T / Hill, E C / Hohmann, M / Hsu, C-L / Iijima, T / Inami, K / Inguglia, G / Ipsita, N / Ishikawa, A / Ito, S / Itoh, R / Iwasaki, M / Jacobs, W W / Jang, E-J / Ji, Q P / Jia, S / Jin, Y / Junkerkalefeld, H / Kaleta, M / Kaliyar, A B / Karyan, G / Kawasaki, T / Kiesling, C / Kim, C-H / Kim, D Y / Kim, K-H / Kim, Y-K / Kindo, H / Kinoshita, K / Kodyš, P / Kohani, S / Kojima, K / Korobov, A / Korpar, S / Kovalenko, E / Kowalewski, R / Križan, P / Krokovny, P / Kumar, J / Kumar, R / Kumara, K / Kuzmin, A / Kwon, Y-J / Lacaprara, S / Lange, J S / Laurenza, M / Leboucher, R / Le Diberder, F R / Levit, D / Lewis, P M / Li, L K / Libby, J / Liptak, Z / Liu, Q Y / Liu, Z Q / Liventsev, D / Longo, S / Lueck, T / Lyu, C / Ma, Y / Maggiora, M / Maharana, S P / Maiti, R / Maity, S / Manfredi, R / Manoni, E / Manthei, A C / Mantovano, M / Marinas, C / Martel, L / Martellini, C / Martini, A / Massaccesi, L / Masuda, M / Matsuoka, K / Matvienko, D / Maurya, S K / McKenna, J A / Meier, F / Merola, M / Metzner, F / Milesi, M / Miller, C / Miyabayashi, K / Mizuk, R / Mohanty, G B / Moneta, S / Mrvar, M / Mussa, R / Nakamura, I / Nakamura, K R / Nakao, M / Nakazawa, Y / Narimani Charan, A / Naruki, M / Narwal, D / Natochii, A / Nayak, L / Nazaryan, G / Nisar, N K / Nishida, S / Ono, H / Onuki, Y / Oskin, P / Pakhlov, P / Pakhlova, G / Paladino, A / Panta, A / Pardi, S / Park, H / Park, J / Paschen, B / Passeri, A / Patra, S / Paul, S / Pedlar, T K / Peruzzi, I / Peschke, R / Pestotnik, R / Piilonen, L E / Pinna Angioni, G / Podesta-Lerma, P L M / Podobnik, T / Pokharel, S / Polat, L / Praz, C / Prell, S / Prencipe, E / Prim, M T / Purwar, H / Rad, N / Rados, P / Raeuber, G / Reif, M / Reiter, S / Ripp-Baudot, I / Rizzo, G / Rizzuto, L B / Rocchetti, P / Roney, J M / Rostomyan, A / Rout, N / Sanders, D A / Sandilya, S / Sangal, A / Santelj, L / Sato, Y / Scavino, B / Schwanda, C / Seino, Y / Selce, A / Senyo, K / Sevior, M E / Sfienti, C / Shan, W / Sharma, C / Shen, C P / Shillington, T / Shiu, J-G / Simon, F / Singh, J B / Skorupa, J / Sobie, R J / Soffer, A / Sokolov, A / Solovieva, E / Spataro, S / Spruck, B / Starič, M / Stefkova, S / Stroili, R / Sue, Y / Sumihama, M / Sutcliffe, W / Suzuki, S Y / Svidras, H / Takizawa, M / Tamponi, U / Tanida, K / Taniguchi, N / Tenchini, F / Tiwary, R / Tonelli, D / Torassa, E / Trabelsi, K / Tsaklidis, I / Ueda, I / Uematsu, Y / Uglov, T / Unger, K / Unno, Y / Uno, K / Uno, S / Urquijo, P / Ushiroda, Y / Vahsen, S E / van Tonder, R / Varner, G S / Varvell, K E / Vinokurova, A / Vismaya, V S / Vitale, L / Vossen, A / Wallner, S / Wang, E / Wang, M-Z / Wang, X L / Warburton, A / Watanabe, M / Watanuki, S / Welsch, M / Wessel, C / Won, E / Xu, X P / Yabsley, B D / Yamada, S / Yan, W / Yang, S B / Ye, H / Yin, J H / Yook, Y M / Yoshihara, K / Zhai, Y / Zhang, Y / Zhilich, V / Zhou, Q D / Zhou, X Y / Zhukova, V I / Žlebčík, R

Physical review letters

2023 Volume 131, Issue 5, Page(s) 51804

Abstract: We present the first measurement of the ratio of branching fractions of inclusive semileptonic B-meson decays, R(X_{e/μ})=B(B→Xeν)/B(B→Xμν), a precision test of electron-muon universality, using data corresponding to 189 fb^{-1} from electron-positron ... ...

Abstract	We present the first measurement of the ratio of branching fractions of inclusive semileptonic B-meson decays, R(X_{e/μ})=B(B→Xeν)/B(B→Xμν), a precision test of electron-muon universality, using data corresponding to 189 fb^{-1} from electron-positron collisions collected with the Belle II detector. In events where the partner B meson is fully reconstructed, we use fits to the lepton momentum spectra above 1.3 GeV/c to obtain R(X_{e/μ})=1.007±0.009(stat)±0.019(syst), which is the most precise lepton-universality test of its kind and agrees with the standard-model expectation.
Language	English
Publishing date	2023-08-18
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.131.051804
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Search for a τ^{+}τ^{-} Resonance in e^{+}e^{-}→μ^{+}μ^{-}τ^{+}τ^{-} Events with the Belle II Experiment.

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, Sw / 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 / Ecker, P / Eliachevitch, M / Epifanov, D / Feichtinger, P / Ferber, T / Ferlewicz, D / Fillinger, T / Finck, C / Finocchiaro, G / Fodor, A / Forti, F / Frey, A / Fulsom, B G / Gabrielli, A / Ganiev, E / Garcia-Hernandez, M / Garmash, A / Gaudino, G / Gaur, V / Gaz, A / Gellrich, A / Ghevondyan, G / Ghosh, D / Ghumaryan, H / Giakoustidis, G / Giordano, R / Giri, A / Glazov, A / Gobbo, B / Godang, R / Gogota, O / Goldenzweig, P / Gradl, W / Grammatico, T / Granderath, S / Graziani, E / Greenwald, D / Gruberová, Z / Gu, T / Guan, Y / Gudkova, K / Guilliams, J / Halder, S / Han, Y / Hara, T / Hayasaka, K / Hayashii, H / Hazra, S / Hearty, C / Hedges, M T / Heredia de la Cruz, I / Hernández Villanueva, M / Hershenhorn, A / Higuchi, T / Hill, E C / Hirata, H / Hoek, M / Hohmann, M / Hsu, C-L / Humair, T / Iijima, T / Inami, K / Inguglia, G / Ipsita, N / Ishikawa, A / Ito, S / Itoh, R / Iwasaki, M / Jackson, P / Jacobs, W W / Jaffe, D E / Jang, E-J / Ji, Q P / Jia, S / Jin, Y / Johnson, A / Joo, K K / Junkerkalefeld, H / Kakuno, H / Kaleta, M / Kalita, D / Kaliyar, A B / Kandra, J / Kang, K H / Kang, S / Karl, R / Karyan, G / Kawasaki, T / Keil, F / Ketter, C / Kiesling, C / Kim, C-H / Kim, D Y / Kim, K-H / Kim, Y-K / Kindo, H / Kodyš, P / Koga, T / Kohani, S / Kojima, K / Konno, T / Korobov, A / Korpar, S / Kovalenko, E / Kowalewski, R / Kraetzschmar, T M G / Križan, P / Krokovny, P / Kuhr, T / Kumar, J / Kumar, M / Kumar, R / Kumara, K / Kunigo, T / Kuzmin, A / Kwon, Y-J / Lacaprara, S / Lai, Y-T / Lam, T / Lanceri, L / Lange, J S / Laurenza, M / Lautenbach, K / Leboucher, R / Le Diberder, F R / Leitl, P / Levit, D / Lewis, P M / Li, C / Li, L K / Li, Y B / Libby, J / Lieret, K / Liu, Q Y / Liu, Z Q / Liventsev, D / Longo, S / Lozar, A / Lueck, T / Lyu, C / Ma, Y / Maggiora, M / Maharana, S P / Maiti, R / Maity, S / Manfredi, R / Manoni, E / Manthei, A C / Mantovano, M / Marcantonio, D / Marcello, S / Marinas, C / Martel, L / Martellini, C / Martini, A / Martinov, T / Massaccesi, L / Masuda, M / Matsuda, T / Matsuoka, K / Matvienko, D / Maurya, S K / McKenna, J A / Mehta, R / Merola, M / Metzner, F / Milesi, M / Miller, C / Mirra, M / Miyabayashi, K / Miyake, H / Mizuk, R / Mohanty, G B / Molina-Gonzalez, N / Mondal, S / Moneta, S / Moser, H-G / Mrvar, M / Mussa, R / Nakamura, I / Nakamura, K R / Nakao, M / Nakayama, H / Nakazawa, H / Nakazawa, Y / Narimani Charan, A / Naruki, M / Narwal, D / Natkaniec, Z / Natochii, A / Nayak, L / Nayak, M / Nazaryan, G / Niebuhr, C / Nisar, N K / Nishida, S / Ogawa, S / Ono, H / Onuki, Y / Oskin, P / Otani, F / Pakhlov, P / Pakhlova, G / Paladino, A / Panta, A / Paoloni, E / Pardi, S / Parham, K / Park, J / Park, S-H / Paschen, B / Passeri, A / Patra, S / Paul, S / Pedlar, T K / Peruzzi, I / Peschke, R / Pestotnik, R / Pham, F / Piccolo, M / Piilonen, L E / Pinna Angioni, G / Podesta-Lerma, P L M / Podobnik, T / Pokharel, S / Polat, L / Praz, C / Prell, S / Prencipe, E / Prim, M T / Purwar, H / Rad, N / Rados, P / Raeuber, G / Raiz, S / Ramirez Morales, A / Reif, M / Reiter, S / Remnev, M / Ripp-Baudot, I / Rizzo, G / Rizzuto, L B / Robertson, S H / Rodríguez Pérez, D / Roehrken, M / Roney, J M / Rostomyan, A / Rout, N / Russo, G / Sahoo, D / Sanders, D A / Sandilya, S / Sangal, A / Santelj, L / Sato, Y / Savinov, V / Scavino, B / Schnepf, M / Schueler, J / Schwanda, C / Seino, Y / Selce, A / Senyo, K / Serrano, J / Sevior, M E / Sfienti, C / Shan, W / Sharma, C / Shen, C P / Shi, X D / Shillington, T / Shiu, J-G / Shtol, D / Shwartz, B / Sibidanov, A / Simon, F / Singh, J B / Skorupa, J / Sobie, R J / Sobotzik, M / Soffer, A / Sokolov, A / Solovieva, E / Spataro, S / Spruck, B / Starič, M / Stavroulakis, P / Stefkova, S / Stottler, Z S / Stroili, R / Strube, J / Sue, Y / Sumihama, M / Sumisawa, K / Sutcliffe, W / Suzuki, S Y / Svidras, H / Takahashi, M / Takizawa, M / Tamponi, U / Tanaka, S / Tanida, K / Tanigawa, H / Tenchini, F / Thaller, A / Tiwary, R / Tonelli, D / Torassa, E / Toutounji, N / Trabelsi, K / Tsaklidis, I / Uchida, M / Ueda, I / Uematsu, Y / Uglov, T / Unger, K / Unno, Y / Uno, K / Uno, S / Urquijo, P / Ushiroda, Y / Vahsen, S E / van Tonder, R / Varner, G S / Varvell, K E / Vinokurova, A / Vismaya, V S / Vitale, L / Vobbilisetti, V / Volpe, R / Vossen, A / Wach, B / Wakai, M / Wakeling, H M / Wallner, S / Wang, E / Wang, M-Z / Wang, X L / Wang, Z / Warburton, A / Watanabe, M / Watanuki, S / Welsch, M / Wessel, C / Won, E / Xu, X P / Yabsley, B D / Yamada, S / Yan, W / Yang, S B / Ye, H / Yelton, J / Yin, J H / Yook, Y M / Yoshihara, K / Yuan, C Z / Yusa, Y / Zani, L / Zhai, Y / Zhang, Y / Zhilich, V / Zhou, J S / Zhou, Q D / Zhou, X Y / Zhukova, V I / Žlebčík, R

Physical review letters

2023 Volume 131, Issue 12, Page(s) 121802

Abstract: 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/c^{2} mass range. We use a 62.8 fb^{-1} sample of e^{+}e^{-} collisions collected at a center-of-mass energy ... ...

Abstract	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/c^{2} 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/c^{2} and for the axionlike particle model over the entire mass range.
Language	English
Publishing date	2023-10-06
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.131.121802
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Book ; Online: First Measurement of the $\Lambda_c^+ \to p \eta'$ decay

Belle Collaboration / Li, S. X. / Cui, J. X. / Shen, C. P. / Adachi, I. / Aihara, H. / Said, S. Al / Asner, D. M. / Atmacan, H. / Aushev, T. / Ayad, R. / Babu, V. / Behera, P. / Belous, K. / Bessner, M. / Bhardwaj, V. / Bhuyan, B. / Bilka, T. / Bodrov, D. /

Bonvicini, G. / Borah, J. / Bozek, A. / Bracko, M. / Branchini, P. / Browder, T. E. / Budano, A. / Campajola, M. / Cervenkov, D. / Chang, M. -C. / Chang, P. / Chekelian, V. / Chen, A. / 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. / Dash, N. / De Nardo, G. / De Pietro, G. / Dhamija, R. / Di Capua, F. / Dolezal, Z. / Dong, T. V. / Epifanov, D. / Ferber, T. / Ferlewicz, D. / Fulsom, B. G. / Garg, R. / Gaur, V. / Gabyshev, N. / Giri, A. / Goldenzweig, P. / Golob, B. / Graziani, E. / Gu, T. / Hara, T. / Hayasaka, K. / Hayashii, H. / Hou, W. -S. / Inami, K. / Ishikawa, A. / Iwasaki, M. / Iwasaki, Y. / Jacobs, W. W. / Jang, E. -J. / Jia, S. / Jin, Y. / Joo, K. K. / Kahn, J. / Kaliyar, A. B. / Kang, K. H. / Kato, Y. / Kawasaki, T. / Kichimi, H. / Kiesling, C. / Kim, C. H. / Kim, D. Y. / Kim, Y. -K. / Kinoshita, K. / Kodys, P. / Konno, T. / Korobov, A. / Korpar, S. / Kovalenko, E. / Krizan, P. / Kroeger, R. / Krokovny, P. / Kumar, M. / Kumar, R. / Kumara, K. / Kwon, Y. -J. / Lam, T. / Laurenza, M. / Lee, S. C. / Li, J. / Li, L. K. / Li, Y. / Gioi, L. Li / Libby, J. / Liventsev, D. / Martini, A. / Masuda, M. / Matsuda, T. / Matvienko, D. / Maurya, S. K. / Meier, F. / Merola, M. / Miyabayashi, K. / Mizuk, R. / Mussa, R. / Nakao, M. / Narwal, D. / Natkaniec, Z. / Natochii, A. / Nayak, L. / Nisar, N. K. / Nishida, S. / Nishimura, K. / Ogawa, K. / Ogawa, S. / Ono, H. / Oskin, P. / Pakhlov, P. / Pakhlova, G. / Pang, T. / Pardi, S. / Park, S. -H. / Patra, S. / Pedlar, T. K. / Pestotnik, R. / Piilonen, L. E. / Podobnik, T. / Popov, V. / Prim, M. T. / Rohrken, M. / Rostomyan, A. / Rout, N. / Russo, G. / Sahoo, D. / Sandilya, S. / Sangal, A. / Sanuki, T. / Savinov, V. / Schnell, G. / Schueler, J. / Schwanda, C. / Schwartz, A. J. / Seino, Y. / Senyo, K. / Sevior, M. E. / Shapkin, M. / Sharma, C. / Shebalin, V. / Shiu, J. -G. / Shwartz, B. / Simon, F. / Solovieva, E. / Stanic, S. / Staric, M. / Stottler, Z. S. / Sumihama, M. / Sumisawa, K. / Sumiyoshi, T. / Sutcliffe, W. / Takizawa, M. / Tamponi, U. / Tanida, K. / Tenchini, F. / Trabelsi, K. / Uchida, M. / Unno, Y. / Uno, K. / Uno, S. / Urquijo, P. / Vahsen, S. E. / Van Tonder, R. / Varner, G. / Vinokurova, A. / Waheed, E. / Wang, D. / Wang, E. / Wang, M. -Z. / Watanuki, S. / Won, E. / Xu, X. / Yabsley, B. D. / Yan, W. / Ye, H. / Yin, J. H. / Yusa, Y. / Zhai, Y. / Zhilich, V. / Zhukova, V.

2021

Abstract: We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay $\Lambda_c^+ \to p \eta'$ with $\eta' \to \eta\pi^+\pi^-$, using a data sample corresponding to an integrated luminosity of 981 $\rm fb^{-1}$, ... ...

Abstract	We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay $\Lambda_c^+ \to p \eta'$ with $\eta' \to \eta\pi^+\pi^-$, using a data sample corresponding to an integrated luminosity of 981 $\rm fb^{-1}$, collected by the Belle detector at the KEKB $e^{+}$$e^{-}$ asymmetric-energy collider. A significant $\Lambda_c^+$ signal is observed for the first time with a signal significance of 5.4$\sigma$. The relative branching fraction with respect to the normalization mode $\Lambda_c^+ \to pK^-\pi^+$ is measured to be \begin{equation} \frac{{\cal B}(\Lambda_c^+ \to p \eta')}{{\cal B}(\Lambda_c^+ \to p K^-\pi^+)} = (7.54 \pm 1.32 \pm 0.75) \times 10^{-3}, \end{equation} where the uncertainties are statistical and systematic, respectively. Using the world-average value of ${\cal B}(\Lambda_c^+ \to p K^-\pi^+) = (6.28\pm0.32)\times10^{-2}$, we obtain \begin{equation} {\cal B}(\Lambda_c^+ \to p \eta') = (4.73 \pm 0.82 \pm 0.47 \pm 0.24)\times 10^{-4}, \end{equation} where the uncertainties are statistical, systematic, and from ${\cal B}(\Lambda_c^+ \to pK^-\pi^+)$, respectively. Comment: 14 pages, 2 figures, accepted for publication in JHEP
Keywords	High Energy Physics - Experiment ; High Energy Physics - Phenomenology
Subject code	551
Publishing date	2021-12-28
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: First Measurement of the Michel Parameter ξ^{'} in the τ^{-}→μ^{-}ν[over ¯]_{μ}ν_{τ} Decay at Belle.

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Article ; Online: Search for a Light Higgs Boson in Single-Photon Decays of ϒ(1S) Using ϒ(2S)→π^{+}π^{-}ϒ(1S) Tagging Method.

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Article ; Online: Test of Light-Lepton Universality in the Rates of Inclusive Semileptonic B-Meson Decays at Belle II.

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Article ; Online: Search for a τ^{+}τ^{-} Resonance in e^{+}e^{-}→μ^{+}μ^{-}τ^{+}τ^{-} Events with the Belle II Experiment.

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Book ; Online: First Measurement of the $\Lambda_c^+ \to p \eta'$ decay

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