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Title: Observation of Large CP Violation in the Neutral B Meson System

Abstract

We present a measurement of the standard model CP violation parameter sin<hspace SPACE=''-0.167''>2{phi}{sub 1} based on a 29.1 fb{sup -1} data sample collected at the {Upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. One neutral B meson is fully reconstructed as a J/{psi}K{sub S} , {psi}(2S)K{sub S} , {chi}{sub c1}K{sub S} , {eta}{sub c}K{sub S} , J/{psi}K{sub L} , or J/{psi}K{sup *0} decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin<hspace SPACE=''-0.167''>2{phi}{sub 1}=0.99{+-} 0.14(stat){+-}0.06(syst) . We conclude that we have observed CP violation in the neutral B meson system.

Authors:
; ; ; ; ; ; ; ;  [1]
  1. (and others)
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40277442
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevLett.87.091802; Othernumber: PRLTAO000087000009091802000001; 027136PRL; PBD: 27 Aug 2001; Journal ID: ISSN 0031-9007
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; B MESONS; DAUGHTER PRODUCTS; DECAY; DISTRIBUTION; RESONANCE; STANDARD MODEL

Citation Formats

Abe, K., Abe, R., Adachi, I., Ahn, Byoung Sup, Aihara, H., Akatsu, M., Alimonti, G., Asai, K., and Asai, M. Observation of Large CP Violation in the Neutral B Meson System. United States: N. p., 2001. Web. doi:10.1103/PhysRevLett.87.091802.
Abe, K., Abe, R., Adachi, I., Ahn, Byoung Sup, Aihara, H., Akatsu, M., Alimonti, G., Asai, K., & Asai, M. Observation of Large CP Violation in the Neutral B Meson System. United States. doi:10.1103/PhysRevLett.87.091802.
Abe, K., Abe, R., Adachi, I., Ahn, Byoung Sup, Aihara, H., Akatsu, M., Alimonti, G., Asai, K., and Asai, M. Mon . "Observation of Large CP Violation in the Neutral B Meson System". United States. doi:10.1103/PhysRevLett.87.091802.
@article{osti_40277442,
title = {Observation of Large CP Violation in the Neutral B Meson System},
author = {Abe, K. and Abe, R. and Adachi, I. and Ahn, Byoung Sup and Aihara, H. and Akatsu, M. and Alimonti, G. and Asai, K. and Asai, M.},
abstractNote = {We present a measurement of the standard model CP violation parameter sin<hspace SPACE=''-0.167''>2{phi}{sub 1} based on a 29.1 fb{sup -1} data sample collected at the {Upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. One neutral B meson is fully reconstructed as a J/{psi}K{sub S} , {psi}(2S)K{sub S} , {chi}{sub c1}K{sub S} , {eta}{sub c}K{sub S} , J/{psi}K{sub L} , or J/{psi}K{sup *0} decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin<hspace SPACE=''-0.167''>2{phi}{sub 1}=0.99{+-} 0.14(stat){+-}0.06(syst) . We conclude that we have observed CP violation in the neutral B meson system.},
doi = {10.1103/PhysRevLett.87.091802},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 9,
volume = 87,
place = {United States},
year = {2001},
month = {8}
}