Rapid Communication
Open Access
Access by Xinjiang University

Measurement of time-dependent $C P$ violation in $B^{0} \to K_{S}^{0} π^{0} π^{0}$ decays

Y. Yusa⁵⁹, H. Aihara⁸⁰, S. Al Said^74,35, D. M. Asner³, H. Atmacan⁷¹, V. Aulchenko^4,60, T. Aushev⁵⁰, R. Ayad⁷⁴, V. Babu⁷⁵ et al. (Belle Collaboration)

V. Babu⁷⁵, I. Badhrees^74,34, S. Bahinipati²², A. M. Bakich⁷³, V. Bansal⁶², P. Behera²⁵, V. Bhardwaj²¹, B. Bhuyan²³, J. Biswal³², A. Bozek⁵⁷, M. Bračko^44,32, T. E. Browder¹⁶, L. Cao³³, D. Červenkov⁵, V. Chekelian⁴⁵, A. Chen⁵⁴, B. G. Cheon¹⁵, K. Chilikin⁴⁰, S.-K. Choi¹⁴, Y. Choi⁷², D. Cinabro⁸⁴, S. Cunliffe⁸, N. Dash²², S. Di Carlo³⁸, T. V. Dong^17,13, Z. Drásal⁵, S. Eidelman^4,60,40, D. Epifanov^4,60, J. E. Fast⁶², B. G. Fulsom⁶², R. Garg⁶³, V. Gaur⁸³, A. Garmash^4,60, A. Giri²⁴, P. Goldenzweig³³, B. Golob^41,32, Y. Guan^26,17, J. Haba^17,13, K. Hayasaka⁵⁹, H. Hayashii⁵³, S. Hirose⁵¹, K. Inami⁵¹, G. Inguglia⁸, A. Ishikawa⁷⁸, R. Itoh^17,13, M. Iwasaki⁶¹, Y. Iwasaki¹⁷, W. W. Jacobs²⁶, S. Jia², Y. Jin⁸⁰, K. K. Joo⁶, K. H. Kang³⁷, T. Kawasaki⁵⁹, C. Kiesling⁴⁵, D. Y. Kim⁷⁰, J. B. Kim³⁶, K. T. Kim³⁶, S. H. Kim¹⁵, K. Kinoshita⁷, P. Kodyš⁵, S. Korpar^44,32, D. Kotchetkov¹⁶, P. Križan^41,32, R. Kroeger⁴⁷, T. Kuhr⁴², R. Kumar⁶⁶, Y.-J. Kwon⁸⁶, J. S. Lange¹¹, I. S. Lee¹⁵, S. C. Lee³⁷, L. K. Li²⁷, Y. B. Li⁶⁴, L. Li Gioi⁴⁵, J. Libby²⁵, D. Liventsev^83,17, M. Lubej³², T. Luo¹⁰, M. Masuda⁷⁹, T. Matsuda⁴⁸, M. Merola^29,52, K. Miyabayashi⁵³, H. Miyata⁵⁹, R. Mizuk^40,49,50, G. B. Mohanty⁷⁵, H. K. Moon³⁶, E. Nakano⁶¹, M. Nakao^17,13, T. Nanut³², K. J. Nath²³, Z. Natkaniec⁵⁷, N. K. Nisar⁶⁵, S. Nishida^17,13, K. Nishimura¹⁶, K. Ogawa⁵⁹, S. Ogawa⁷⁷, H. Ono^58,59, G. Pakhlova^40,50, B. Pal³, S. Pardi²⁹, H. Park³⁷, S. Paul⁷⁶, T. K. Pedlar⁴³, R. Pestotnik³², L. E. Piilonen⁸³, V. Popov^40,50, E. Prencipe¹⁹, A. Rostomyan⁸, G. Russo²⁹, Y. Sakai^17,13, S. Sandilya⁷, T. Sanuki⁷⁸, V. Savinov⁶⁵, O. Schneider³⁹, G. Schnell^1,20, C. Schwanda²⁸, A. J. Schwartz⁷, Y. Seino⁵⁹, K. Senyo⁸⁵, O. Seon⁵¹, M. E. Sevior⁴⁶, C. P. Shen², T.-A. Shibata⁸¹, J.-G. Shiu⁵⁶, M. Starič³², M. Sumihama¹², T. Sumiyoshi⁸², M. Takizawa^69,18,67, U. Tamponi³⁰, K. Tanida³¹, F. Tenchini⁴⁶, M. Uchida⁸¹, T. Uglov^40,50, Y. Unno¹⁵, S. Uno^17,13, Y. Ushiroda^17,13, Y. Usov^4,60, C. Van Hulse¹, R. Van Tonder³³, G. Varner¹⁶, K. E. Varvell⁷³, V. Vorobyev^4,60,40, A. Vossen⁹, E. Waheed⁴⁶, B. Wang⁷, C. H. Wang⁵⁵, M.-Z. Wang⁵⁶, P. Wang²⁷, E. Won³⁶, H. Ye⁸, J. H. Yin²⁷, Z. P. Zhang⁶⁸, V. Zhilich^4,60, and V. Zhulanov^4,60 (Belle Collaboration)

¹University of the Basque Country UPV/EHU, 48080 Bilbao
²Beihang University, Beijing 100191
³Brookhaven National Laboratory, Upton, New York 11973
⁴Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090
⁵Faculty of Mathematics and Physics, Charles University, 121 16 Prague
⁶Chonnam National University, Kwangju 660-701
⁷University of Cincinnati, Cincinnati, Ohio 45221
⁸Deutsches Elektronen–Synchrotron, 22607 Hamburg
⁹Duke University, Durham, North Carolina 27708
¹⁰Key Laboratory of Nuclear Physics and Ion-Beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443
¹¹Justus-Liebig-Universität Gießen, 35392 Gießen
¹²Gifu University, Gifu 501-1193
¹³SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193
¹⁴Gyeongsang National University, Chinju 660-701
¹⁵Hanyang University, Seoul 133-791
¹⁶University of Hawaii, Honolulu, Hawaii 96822
¹⁷High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
¹⁸J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801
¹⁹Forschungszentrum Jülich, 52425 Jülich
²⁰IKERBASQUE, Basque Foundation for Science, 48013 Bilbao
²¹Indian Institute of Science Education and Research Mohali, SAS Nagar, 140306
²²Indian Institute of Technology Bhubaneswar, Satya Nagar 751007
²³Indian Institute of Technology Guwahati, Assam 781039
²⁴Indian Institute of Technology Hyderabad, Telangana 502285
²⁵Indian Institute of Technology Madras, Chennai 600036
²⁶Indiana University, Bloomington, Indiana 47408
²⁷Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
²⁸Institute of High Energy Physics, Vienna 1050
²⁹INFN—Sezione di Napoli, 80126 Napoli
³⁰INFN—Sezione di Torino, 10125 Torino
³¹Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195
³²J. Stefan Institute, 1000 Ljubljana
³³Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe
³⁴King Abdulaziz City for Science and Technology, Riyadh 11442
³⁵Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589
³⁶Korea University, Seoul 136-713
³⁷Kyungpook National University, Daegu 702-701
³⁸LAL, University Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay
³⁹École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015
⁴⁰P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991
⁴¹Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana
⁴²Ludwig Maximilians University, 80539 Munich
⁴³Luther College, Decorah, Iowa 52101
⁴⁴University of Maribor, 2000 Maribor
⁴⁵Max-Planck-Institut für Physik, 80805 München
⁴⁶School of Physics, University of Melbourne, Victoria 3010
⁴⁷University of Mississippi, University, Mississippi 38677
⁴⁸University of Miyazaki, Miyazaki 889-2192
⁴⁹Moscow Physical Engineering Institute, Moscow 115409
⁵⁰Moscow Institute of Physics and Technology, Moscow Region 141700
⁵¹Graduate School of Science, Nagoya University, Nagoya 464-8602
⁵²Università di Napoli Federico II, 80055 Napoli
⁵³Nara Women’s University, Nara 630-8506
⁵⁴National Central University, Chung-li 32054
⁵⁵National United University, Miao Li 36003
⁵⁶Department of Physics, National Taiwan University, Taipei 10617
⁵⁷H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342
⁵⁸Nippon Dental University, Niigata 951-8580
⁵⁹Niigata University, Niigata 950-2181
⁶⁰Novosibirsk State University, Novosibirsk 630090
⁶¹Osaka City University, Osaka 558-8585
⁶²Pacific Northwest National Laboratory, Richland, Washington 99352
⁶³Panjab University, Chandigarh 160014
⁶⁴Peking University, Beijing 100871
⁶⁵University of Pittsburgh, Pittsburgh, Pennsylvania 15260
⁶⁶Punjab Agricultural University, Ludhiana 141004
⁶⁷Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198
⁶⁸University of Science and Technology of China, Hefei 230026
⁶⁹Showa Pharmaceutical University, Tokyo 194-8543
⁷⁰Soongsil University, Seoul 156-743
⁷¹University of South Carolina, Columbia, South Carolina 29208
⁷²Sungkyunkwan University, Suwon 440-746
⁷³School of Physics, University of Sydney, New South Wales 2006
⁷⁴Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451
⁷⁵Tata Institute of Fundamental Research, Mumbai 400005
⁷⁶Department of Physics, Technische Universität München, 85748 Garching
⁷⁷Toho University, Funabashi 274-8510
⁷⁸Department of Physics, Tohoku University, Sendai 980-8578
⁷⁹Earthquake Research Institute, University of Tokyo, Tokyo 113-0032
⁸⁰Department of Physics, University of Tokyo, Tokyo 113-0033
⁸¹Tokyo Institute of Technology, Tokyo 152-8550
⁸²Tokyo Metropolitan University, Tokyo 192-0397
⁸³Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
⁸⁴Wayne State University, Detroit, Michigan 48202
⁸⁵Yamagata University, Yamagata 990-8560
⁸⁶Yonsei University, Seoul 120-749

PDF

Phys. Rev. D 99, 011102(R) – Published 18 January, 2019

DOI: https://doi.org/10.1103/PhysRevD.99.011102

Abstract

We report a measurement of time-dependent $C P$ violation in $B^{0} \to K_{S}^{0} π^{0} π^{0}$ decays using a data sample of $772 \times 10^{6} B \bar{B}$ pairs collected by the Belle experiment running at the $ϒ (4 S)$ resonance at the KEKB $e^{+} e^{-}$ collider. This decay proceeds mainly via a $b \to s d \bar{d}$ “penguin” amplitude. The results are $\sin 2 ϕ_{1}^{eff} = 0.9 2_{- 0.31}^{+ 0.27}$ (stat.) $\pm 0.11$ (syst.) and $A = 0.28 \pm 0.21$ (stat.) $\pm 0.04$ (syst.), which are the most precise measurements of $C P$ violation in this decay mode to date. The value for the $C P$ -violating parameter $\sin 2 ϕ_{1}^{eff}$ is consistent with that obtained using decay modes proceeding via a $b \to c \bar{c} s$ “tree” amplitude.

Physics Subject Headings (PhySH)

Article Text

References (26)

M. Kobayashi and T. Maskawa, Prog. Theor. Phys. 49, 652 (1973).
A. B. Carter and A. I. Sanda, Phys. Rev. Lett. 45, 952 (1980); Phys. Rev. D 23, 1567 (1981); I. I. Bigi and A. I. Sanda, Nucl. Phys. 193, 85 (1981).
A general review of the formalism is given in I. I. Bigi, V. A. Khoze, N. G. Uraltsev, and A. I. Sanda, CP Violation, edited by C. Jarlskog (World Scientific, Singapore, 1989), p. 175.
T. Gershon and M. Hazumi, Phys. Lett. B 596, 163 (2004).
Another naming convention, $β (= ϕ_{1})$ , is also used in the literature.
I. Adachi et al. (Belle Collaboration), Phys. Rev. Lett. 108, 171802 (2012).
B. Aubert et al. (BABAR Collaboration), Phys. Rev. D 79, 072009 (2009).
Y. Grossman and M. Woarh, Phys. Lett. B 395, 241 (1997).
H.-Y. Cheng, arXiv:hep-ph/0702252.
B. Aubert et al. (BABAR Collaboration), Phys. Rev. D 76, 071101 (2007).
A. Abashian et al. (Belle Collaboration), Nucl. Instrum. Methods Phys. Res., Sect. A 479, 117 (2002); also see detector section in J. Brodzicka et al., Prog. Theor. Exp. Phys. 2012, 04D001 (2012).
Z. Natkaniec et al. (Belle SVD2 Group), Nucl. Instrum. Methods Phys. Res., Sect. A 560, 1 (2006).
M. Fujikawa et al. (Belle Collaboration), Phys. Rev. D 81, 011101 (2010).
K. Sumisawa et al. (Belle Collaboration), Phys. Rev. Lett. 95, 061801 (2005).
D. J. Lange, Nucl. Instrum. Methods Phys. Res., Sect. A 462, 152 (2001).
R. Brun et al., Report No. CERN DD/EE/84-1, 1984.
M. Feindt and U. Kerzel, Nucl. Instrum. Methods Phys. Res., Sect. A 559, 190 (2006).
H. Nakano, Ph. D. thesis, Tohoku University, 2014, Ch. 4 (unpublished), https://tohoku.repo.nii.ac.jp/?action=pages_view_main&active_action=repository_view_main_item_detail&item_id=70563&item_no=1&page_id=33&block_id=38.
The Fox-Wolfram moments were introduced in G. C. Fox and S. Wolfram, Phys. Rev. Lett. 41, 1581 (1978); The Fisher discriminant used by Belle, based on modified Fox-Wolfram moments (SFW), is described in K. Abe et al. (Belle Collaboration), 87, 101801 (2001); Phys. Lett. B 511, 151 (2001).
S. H. Lee et al. (Belle Collaboration), Phys. Rev. Lett. 91, 261801 (2003).
H. Tajima et al., Nucl. Instrum. Methods Phys. Res., Sect. A 533, 370 (2004).
H. Kakuno et al., Nucl. Instrum. Methods Phys. Res., Sect. A 533, 516 (2004).
H. Albrecht et al. (ARGUS Collaboration), Phys. Lett. B 241, 278 (1990).
M. Tanabashi et al. (Particle Data Group), Phys. Rev. D 98, 030001 (2018).
O. Long, M. Baak, R. N. Cahn, and D. Kirkby, Phys. Rev. D 68, 034010 (2003).
Y. Amhis et al. (Heavy Flavor Averaging Group), Eur. Phys. J. C 77, 895 (2017).

Phys. Rev. D 99, 011102(R)– Published 18 January, 2019

Vol. 99, Iss. 1 — 1 January 2019

Received 8 October 2018

DOI: https://doi.org/10.1103/PhysRevD.99.011102

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society

Physical Review D

Reuse & Permissions

Export citation

Export citation

Measurement of time-dependent $C P$ violation in $B^{0} \to K_{S}^{0} π^{0} π^{0}$ decays

Abstract

Physics Subject Headings (PhySH)

Article Text

References (26)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation

Measurement of time-dependent CP violation in B0→KS0π0π0 decays

Abstract

Physics Subject Headings (PhySH)

Article Text

References (26)

Measurement of time-dependent $C P$ violation in $B^{0} \to K_{S}^{0} π^{0} π^{0}$ decays