Measurement of the Direct CP Asymmetry in B¯→X(s+dγ) Decays with a Lepton Tag

L Pesántez; P Urquijo; J Dingfelder; A Abdesselam; I Adachi; K Adamczyk; H Aihara; S Al Said; K Arinstein; D M Asner; V Aulchenko; T Aushev; R Ayad; S Bahinipati; A M Bakich; V Bansal; E Barberio; V Bhardwaj; B Bhuyan; A Bobrov; A Bondar; G Bonvicini; A Bozek; M Bračko; T E Browder; D Červenkov; V Chekelian; A Chen; B G Cheon; K Chilikin; R Chistov; K Cho; V Chobanova; Y Choi; D Cinabro; J Dalseno; Z Doležal; Z Drásal; A Drutskoy; D Dutta; S Eidelman; H Farhat; J E Fast; T Ferber; O Frost; V Gaur; N Gabyshev; S Ganguly; A Garmash; D Getzkow; R Gillard; Y M Goh; B Golob; J Haba; J Hasenbusch; H Hayashii; X H He; A Heller; T Horiguchi; W-S Hou; M Huschle; T Iijima; K Inami; A Ishikawa; R Itoh; Y Iwasaki; I Jaegle; D Joffe; T Julius; K H Kang; E Kato; T Kawasaki; C Kiesling; D Y Kim; J B Kim; J H Kim; K T Kim; M J Kim; S H Kim; Y J Kim; B R Ko; P Kodyš; S Korpar; P Križan; P Krokovny; B Kronenbitter; T Kuhr; T Kumita; A Kuzmin; Y-J Kwon; J S Lange; I S Lee; Y Li; L Li Gioi; J Libby; D Liventsev; P Lukin; D Matvienko; K Miyabayashi; H Miyata; R Mizuk; G B Mohanty; A Moll; H K Moon; E Nakano; M Nakao; T Nanut; Z Natkaniec; M Nayak; C Ng; N K Nisar; S Nishida; S Ogawa; S Okuno; S L Olsen; C Oswald; P Pakhlov; G Pakhlova; C W Park; H Park; T K Pedlar; R Pestotnik; M Petrič; L E Piilonen; E Ribežl; M Ritter; A Rostomyan; M Rozanska; Y Sakai; S Sandilya; L Santelj; T Sanuki; Y Sato; V Savinov; O Schneider; G Schnell; C Schwanda; A J Schwartz; K Senyo; O Seon; M E Sevior; V Shebalin; C P Shen; T-A Shibata; J-G Shiu; B Shwartz; A Sibidanov; F Simon; Y-S Sohn; A Sokolov; E Solovieva; M Starič; M Steder; T Sumiyoshi; U Tamponi; N Taniguchi; G Tatishvili; Y Teramoto; K Trabelsi; M Uchida; T Uglov; Y Unno; S Uno; Y Usov; C Van Hulse; P Vanhoefer; G Varner; A Vinokurova; V Vorobyev; M N Wagner; B Wang; C H Wang; M-Z Wang; P Wang; Y Watanabe; K M Williams; E Won; J Yamaoka; S Yashchenko; Y Yook; Z P Zhang; V Zhilich; V Zhulanov; A Zupanc; Belle Collaboration

doi:10.1103/PhysRevLett.114.151601

Measurement of the Direct CP Asymmetry in B¯→X(s+dγ) Decays with a Lepton Tag

Phys Rev Lett. 2015 Apr 17;114(15):151601. doi: 10.1103/PhysRevLett.114.151601. Epub 2015 Apr 15.

Authors

L Pesántez¹, P Urquijo², J Dingfelder¹, A Abdesselam³, I Adachi^{4

5}, K Adamczyk⁶, H Aihara⁷, S Al Said^{8

3}, K Arinstein⁹, D M Asner¹⁰, V Aulchenko⁹, T Aushev^{11

12}, R Ayad³, S Bahinipati¹³, A M Bakich¹⁴, V Bansal¹⁰, E Barberio², V Bhardwaj¹⁵, B Bhuyan¹⁶, A Bobrov⁹, A Bondar⁹, G Bonvicini¹⁷, A Bozek⁶, M Bračko^{18

19}, T E Browder²⁰, D Červenkov²¹, V Chekelian²², A Chen²³, B G Cheon²⁴, K Chilikin¹¹, R Chistov¹¹, K Cho²⁵, V Chobanova²², Y Choi²⁶, D Cinabro¹⁷, J Dalseno^{22

27}, Z Doležal²¹, Z Drásal²¹, A Drutskoy^{11

28}, D Dutta¹⁶, S Eidelman⁹, H Farhat¹⁷, J E Fast¹⁰, T Ferber²⁹, O Frost²⁹, V Gaur³⁰, N Gabyshev⁹, S Ganguly¹⁷, A Garmash⁹, D Getzkow³¹, R Gillard¹⁷, Y M Goh²⁴, B Golob^{18

32}, J Haba^{4

5}, J Hasenbusch¹, H Hayashii¹⁵, X H He³³, A Heller³⁴, T Horiguchi³⁵, W-S Hou³⁶, M Huschle³⁴, T Iijima^{37

38}, K Inami³⁷, A Ishikawa³⁵, R Itoh^{4

5}, Y Iwasaki⁵, I Jaegle²⁰, D Joffe³⁹, T Julius², K H Kang⁴⁰, E Kato³⁵, T Kawasaki⁴¹, C Kiesling²², D Y Kim⁴², J B Kim⁴³, J H Kim²⁵, K T Kim⁴³, M J Kim⁴⁰, S H Kim²⁴, Y J Kim²⁵, B R Ko⁴³, P Kodyš²¹, S Korpar^{18

19}, P Križan^{18

32}, P Krokovny⁹, B Kronenbitter³⁴, T Kuhr³⁴, T Kumita⁴⁴, A Kuzmin⁹, Y-J Kwon⁴⁵, J S Lange³¹, I S Lee²⁴, Y Li⁴⁶, L Li Gioi²², J Libby⁴⁷, D Liventsev⁵, P Lukin⁹, D Matvienko⁹, K Miyabayashi¹⁵, H Miyata⁴¹, R Mizuk^{11

28}, G B Mohanty³⁰, A Moll^{22

27}, H K Moon⁴³, E Nakano⁴⁸, M Nakao^{4

5}, T Nanut¹⁸, Z Natkaniec⁶, M Nayak⁴⁷, C Ng⁷, N K Nisar³⁰, S Nishida^{4

5}, S Ogawa⁴⁹, S Okuno⁵⁰, S L Olsen⁵¹, C Oswald¹, P Pakhlov^{11

28}, G Pakhlova¹¹, C W Park²⁶, H Park⁴⁰, T K Pedlar⁵², R Pestotnik¹⁸, M Petrič¹⁸, L E Piilonen⁴⁶, E Ribežl¹⁸, M Ritter²², A Rostomyan²⁹, M Rozanska⁶, Y Sakai^{4

5}, S Sandilya³⁰, L Santelj⁵, T Sanuki³⁵, Y Sato³⁷, V Savinov⁵³, O Schneider⁵⁴, G Schnell^{55

56}, C Schwanda⁵⁷, A J Schwartz⁵⁸, K Senyo⁵⁹, O Seon³⁷, M E Sevior², V Shebalin⁹, C P Shen⁶⁰, T-A Shibata⁶¹, J-G Shiu³⁶, B Shwartz⁹, A Sibidanov¹⁴, F Simon^{22

27}, Y-S Sohn⁴⁵, A Sokolov⁶², E Solovieva¹¹, M Starič¹⁸, M Steder²⁹, T Sumiyoshi⁴⁴, U Tamponi^{63

64}, N Taniguchi⁵, G Tatishvili¹⁰, Y Teramoto⁴⁸, K Trabelsi^{4

5}, M Uchida⁶¹, T Uglov^{11

12}, Y Unno²⁴, S Uno^{4

5}, Y Usov⁹, C Van Hulse⁵⁵, P Vanhoefer²², G Varner²⁰, A Vinokurova⁹, V Vorobyev⁹, M N Wagner³¹, B Wang⁵⁸, C H Wang⁶⁵, M-Z Wang³⁶, P Wang⁶⁶, Y Watanabe⁵⁰, K M Williams⁴⁶, E Won⁴³, J Yamaoka¹⁰, S Yashchenko²⁹, Y Yook⁴⁵, Z P Zhang⁶⁷, V Zhilich⁹, V Zhulanov⁹, A Zupanc¹⁸; Belle Collaboration

Affiliations

¹ University of Bonn, 53115 Bonn.
² School of Physics, University of Melbourne, Victoria 3010.
³ Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
⁴ The Graduate University for Advanced Studies, Hayama 240-0193.
⁵ High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
⁶ H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
⁷ Department of Physics, University of Tokyo, Tokyo 113-0033.
⁸ Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589.
⁹ Budker Institute of Nuclear Physics SB RAS and Novosibirsk State University, Novosibirsk 630090.
¹⁰ Pacific Northwest National Laboratory, Richland, Washington 99352.
¹¹ Institute for Theoretical and Experimental Physics, Moscow 117218.
¹² Moscow Institute of Physics and Technology, Moscow Region 141700.
¹³ Indian Institute of Technology Bhubaneswar, Satya Nagar 751007.
¹⁴ School of Physics, University of Sydney, New South Wales 2006.
¹⁵ Nara Women's University, Nara 630-8506.
¹⁶ Indian Institute of Technology Guwahati, Assam 781039.
¹⁷ Wayne State University, Detroit, Michigan 48202.
¹⁸ J. Stefan Institute, 1000 Ljubljana.
¹⁹ University of Maribor, 2000 Maribor.
²⁰ University of Hawaii, Honolulu, Hawaii 96822.
²¹ Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
²² Max-Planck-Institut für Physik, 80805 München.
²³ National Central University, Chung-li 32054.
²⁴ Hanyang University, Seoul 133-791.
²⁵ Korea Institute of Science and Technology Information, Daejeon 305-806.
²⁶ Sungkyunkwan University, Suwon 440-746.
²⁷ Excellence Cluster Universe, Technische Universität München, 85748 Garching.
²⁸ Moscow Physical Engineering Institute, Moscow 115409.
²⁹ Deutsches Elektronen-Synchrotron, 22607 Hamburg.
³⁰ Tata Institute of Fundamental Research, Mumbai 400005.
³¹ Justus-Liebig-Universität Gießen, 35392 Gießen.
³² Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
³³ Peking University, Beijing 100871.
³⁴ Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
³⁵ Tohoku University, Sendai 980-8578.
³⁶ Department of Physics, National Taiwan University, Taipei 10617.
³⁷ Graduate School of Science, Nagoya University, Nagoya 464-8602.
³⁸ Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602.
³⁹ Kennesaw State University, Kennesaw, Georgia 30144.
⁴⁰ Kyungpook National University, Daegu 702-701.
⁴¹ Niigata University, Niigata 950-2181.
⁴² Soongsil University, Seoul 156-743.
⁴³ Korea University, Seoul 136-713.
⁴⁴ Tokyo Metropolitan University, Tokyo 192-0397.
⁴⁵ Yonsei University, Seoul 120-749.
⁴⁶ CNP, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
⁴⁷ Indian Institute of Technology Madras, Chennai 600036.
⁴⁸ Osaka City University, Osaka 558-8585.
⁴⁹ Toho University, Funabashi 274-8510.
⁵⁰ Kanagawa University, Yokohama 221-8686.
⁵¹ Seoul National University, Seoul 151-742.
⁵² Luther College, Decorah, Iowa 52101.
⁵³ University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
⁵⁴ École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015.
⁵⁵ University of the Basque Country UPV/EHU, 48080 Bilbao.
⁵⁶ IKERBASQUE, Basque Foundation for Science, 48013 Bilbao.
⁵⁷ Institute of High Energy Physics, Vienna 1050.
⁵⁸ University of Cincinnati, Cincinnati, Ohio 45221.
⁵⁹ Yamagata University, Yamagata 990-8560.
⁶⁰ Beihang University, Beijing 100191.
⁶¹ Tokyo Institute of Technology, Tokyo 152-8550.
⁶² Institute for High Energy Physics, Protvino 142281.
⁶³ INFN-Sezione di Torino, 10125 Torino.
⁶⁴ University of Torino, 10124 Torino.
⁶⁵ National United University, Miao Li 36003.
⁶⁶ Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049.
⁶⁷ University of Science and Technology of China, Hefei 230026.

PMID: 25933306
DOI: 10.1103/PhysRevLett.114.151601

Abstract

We report the measurement of the direct CP asymmetry in the radiative B¯→X(s+dγ) decay using a data sample of (772 ± 11)×10(6) BB[over ¯] pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The CP asymmetry is measured as a function of the photon energy threshold. For Eγ*≥2.1 GeV, where Eγ* is the photon energy in the center-of-mass frame, we obtain A(CP)(B¯→X(s+dγ))=(2.2±3.9±0.9)%, consistent with the standard model prediction.