首页|Measurement of branching fractions, CP asymmetry, and isospin asymmetry
for $\boldsymbol{B\rightarrow\rho\gamma}$ decays using Belle and Belle II
data
Measurement of branching fractions, CP asymmetry, and isospin asymmetry
for $\boldsymbol{B\rightarrow\rho\gamma}$ decays using Belle and Belle II
data
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Arxiv
We present measurements of $B^{+}\rightarrow\rho^{+}\gamma$ and
$B^{0}\rightarrow\rho^{0}\gamma$ decays using a combined data sample of $772
\times 10^6$ $B\overline{B}$ pairs collected by the Belle experiment and
$387\times 10^6$ $B\overline{B}$ pairs collected by the Belle II experiment in
$e^{+}e^{-}$ collisions at the $\Upsilon (4S)$ resonance. After an optimized
selection, a simultaneous fit to the Belle and Belle II data sets yields
$114\pm 12$ $B^{+}\rightarrow\rho^{+}\gamma$ and $99\pm 12$
$B^{0}\rightarrow\rho^{0}\gamma$ decays. The measured branching fractions are
$(13.1^{+2.0 +1.3}_{-1.9 -1.2})\times 10^{-7}$ and $(7.5\pm
1.3^{+1.0}_{-0.8})\times 10^{-7}$ for $B^{+}\rightarrow\rho^{+}\gamma$ and
$B^{0}\rightarrow\rho^{0}\gamma$ decays, respectively, where the first
uncertainty is statistical and the second is systematic. We also measure the
isospin asymmetry $A_{\rm I}(B\rightarrow\rho\gamma)=(10.9^{+11.2 +7.8}_{-11.7
-7.3})\%$ and the direct CP asymmetry
$A_{CP}(B^{+}\rightarrow\rho^{+}\gamma)=(-8.2\pm 15.2^{+1.6}_{-1.2})\%$.
N. Rout、B. Scavino、T. Koga、M. Roehrken、C. -H. Kim、R. Mussa、J. Serrano、E. Wang、V. Vobbilisetti、Y. Unno、K. E. Varvell、J. M. Roney、T. Hara、U. Tamponi、K. Dort、A. Frey、W. Shan、G. Pinna Angioni、C. Cecchi、M. Bra?ko、W. Yan、P. Oskin、S. Tanaka、W. W. Jacobs、Y. Han、Y. Jin、S. B. Yang、G. Rizzo、E. Graziani、S. Uno、V. S. Vismaya、P. Pakhlov、T. Lam、M. Stari?、Z. Q. Liu、C. Lyu、L. Martel、P. Krokovny、K. Trabelsi、H. Kindo、D. Dossett、V. Zhilich、P. Goldenzweig、G. De Nardo、A. Budano、S. Marcello、A. Bobrov、I. Tsaklidis、T. Ferber、S. Bettarini、G. Russo、S. Lacaprara、A. Bolz、T. Kuhr、P. Ecker、A. Fodor、P. Cheema、Y. Guan、K. K. Joo、C. Sfienti、F. Bianchi、A. Sokolov、A. Warburton、S. Dreyer、A. Soffer、R. Peschke、F. U. Bernlochner、B. Gobbo、R. Maiti、S. Reiter、H. -E. Cho、S. Prell、A. Korobov、K. Chilikin、L. Corona、P. Horak、X. Y. Zhou、D. Ghosh、G. B. Mohanty、S. Dubey、A. Vinokurova、O. Gogota、M. J. Lee、Y. -J. Kwon、S. Das、B. Bhuyan、R. de Sangro、M. Sumihama、H. Svidras、M. Remnev、G. Ghevondyan、G. Finocchiaro、K. Unger、S. Maity、J. Yelton、G. De Pietro、S. H. Robertson、R. Mehta、H. Aihara、K. Kojima、G. Gaudino、R. Cheaib、S. Ogawa、C. Miller、S. Jia、Y. Onishchuk、S. P. Maharana、K. Uno、Q. P. Ji、C. P. Shen、S. Longo、G. Nazaryan、J. A. McKenna、L. Aggarwal、D. Y. Kim、T. Aushev、T. Humair、J. Cerasoli、H. Bae、I. Ripp-Baudot、M. Schwickardi、M. -Z. Wang、M. Dorigo、M. Piccolo、H. Hayashii、H. Junkerkalefeld、H. Park、K. Miyabayashi、J. Kumar、D. Kalita、S. Wallner、S. A. De La Motte、L. Bierwirth、Y. Ushiroda、M. Maggiora、I. Adachi、T. Lueck、B. G. Cheon、M. Eliachevitch、J. B. Singh、I. Heredia de la Cruz、M. Veronesi、M. Kumar、Z. Dole?al、L. Zani、K. Parham、E. Manoni、E. Won、A. Rostomyan、F. Metzner、Y. -K. Kim、K. -H. Kim、T. Kawasaki、M. Hoek、O. Tittel、J. Kandra、L. K. Li、X. P. Xu、S. -K. Choi、V. Savinov、K. Inami、R. J. Sobie、Q. Y. Liu、V. Aushev、R. Kumar、E. Ganiev、F. R. Le Diberder、P. Bambade、S. Sandilya、F. Keil、G. Casarosa、S. Spataro、R. A. Briere、T. Fillinger、A. Gellrich、F. Forti、D. Shtol、X. D. Shi、P. Jackson、D. Greenwald、D. Marcantonio、P. Feichtinger、E. De La Cruz-Burelo、J. Wiechczynski、P. Stavroulakis、F. Simon、S. Patra、M. E. Sevior、T. Bilka、B. Wach、M. Iwasaki、K. R. Nakamura、S. Raiz、A. Selce、A. Bozek、X. L. Wang、R. Manfredi、D. Bodrov、I. Nakamura、C. Niebuhr、G. Giakoustidis、Y. Nakazawa、Y. Li、T. Podobnik、M. H. Liu、P. L. M. Podesta-Lerma、Z. Natkaniec、L. E. Piilonen、M. Mantovano、M. T. Prim、T. Gu、K. Kumara、C. Finck、R. Leboucher、S. Halder、S. Paul、V. I. Zhukova、C. Z. Yuan、R. Pestotnik、V. Bertacchi、N. Molina-Gonzalez、T. Kunigo、M. Mrvar、D. Epifanov、E. Solovieva、R. Volpe、A. Martini、M. Nakao、H. Ghumaryan、A. J. Schwartz、T. E. Browder、D. A. Sanders、J. V. Bennett、S. Bilokin、S. Bansal、H. Atmacan、R. Giordano、M. Merola、P. Kody?、P. Chang、P. Rados、S. Moneta、A. Gaz、E. Torassa、K. Cho、A. Glazov、A. Heidelbach、E. Prencipe、J. Becker、S. Bussino、R. Ayad、L. Vitale、M. -C. Chang、R. Stroili、K. Adamczyk、M. Barrett、D. Tonelli、S. Choudhury、S. Pokharel、M. Destefanis、A. Ishikawa、I. Ueda、K. Tanida、L. Nayak、B. Spruck、Z. Wang、S. -H. Park、J. -G. Shiu、G. Mancinelli、A. Bondar、A. Passeri、K. Senyo、Q. D. Zhou、T. Iijima、S. Watanuki、Sw. Banerjee、M. De Nuccio、C. Marinas、B. D. Yabsley、M. Reif、M. Takizawa、A. Panta、F. Becherer、K. Chirapatpimol、W. Sutcliffe、A. Kuzmin、C. Martellini、F. Dattola、C. Praz、Belle II Collaboration、M. Uchida、N. Rauls、E. Bertholet、R. Garg、Y. Uematsu、P. Urquijo、B. Zhang、A. Giri、M. Nayak、S. E. Vahsen、T. K. Pedlar、D. Levit、T. Shimasaki、L. Santelj、C. Schmitt、K. Sumisawa、S. Hazra、A. Baur、J. Dingfelder、V. Babu、G. Pakhlova、M. Hohmann、D. Ferlewicz、J. Skorupa、Y. Sato、T. Martinov、R. Itoh、K. H. Kang、N. Akopov、D. Narwal、K. Yoshihara、N. Anh Ky、A. Di Canto、R. Tiwary、Y. Ma、M. Hern¨￠ndez Villanueva、L. Cao、M. Laurenza、G. Karyan、F. Meier、P. M. Lewis、C. Kiesling、H. Purwar、L. Lanceri、S. Bahinipati、A. Narimani Charan、J. Baudot、H. Ono、C. -L. Hsu、E. -J. Jang、K. Gudkova、A. Aloisio、T. Uglov、M. Garcia-Hernandez、H. Miyake、F. Di Capua、F. Tenchini、S. Kohani、D. Matvienko、G. Raeuber、C. Li、M. Campajola、R. van Tonder、A. Gabrielli、Y. -T. Lai、M. Masuda、Z. Gruberov¨￠、G. Dujany、M. Aversano、M. T. Hedges、S. Nishida、D. M. Asner、Y. Seino、T. M. G. Kraetzschmar、V. Gaur、S. Pardi、M. Mirra、T. V. Dong、R. Kowalewski、A. Sibidanov、S. Korpar、L. Massaccesi、B. G. Fulsom、Y. Zhang、T. Grammatico、A. Natochii、M. Neu、D. Liventsev、M. Bessner、M. Naruki、J. H. Yin、M. Bertemes、S. Stefkova、R. Dhamija、H. -G. Moser、S. Mondal、J. S. Lange、N. Ipsita、R. Godang、J. Libby、P. Branchini、E. Kovalenko、C. Wessel、C. Schwanda、Y. B. Li、R. Mizuk、F. Otani、S. Yamada、W. Gradl、K. Lautenbach、A. B. Kaliyar、S. K. Maurya、K. Kinoshita、T. Higuchi、T. Shillington、A. Beaubien、D. Biswas、P. Kri?an、M. Wakai、M. Sobotzik
Arxiv
