1. Difference in direct charge-parity violation between charged and neutral B meson decays.
- Author
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Lin SW, Unno Y, Hou WS, Chang P, Adachi I, Aihara H, Akai K, Arinstein K, Aulchenko V, Aushev T, Aziz T, Bakich AM, Balagura V, Barberio E, Bay A, Bedny I, Bitenc U, Bondar A, Bozek A, Bracko M, Browder TE, Chang MC, Chao Y, Chen A, Chen KF, Chen WT, Cheon BG, Chiang CC, Chistov R, Cho IS, Choi SK, Choi Y, Choi YK, Cole S, Dalseno J, Danilov M, Dash M, Drutskoy A, Eidelman S, Epifanov D, Fratina S, Fujikawa M, Furukawa K, Gabyshev N, Goldenzweig P, Golob B, Ha H, Haba J, Hara T, Hayasaka K, Hayashii H, Hazumi M, Heffernan D, Hokuue T, Hoshi Y, Hsiung YB, Hyun HJ, Iijima T, Ikado K, Inami K, Ishikawa A, Ishino H, Itoh R, Iwabuchi M, Iwasaki M, Iwasaki Y, Kah DH, Kaji H, Kataoka SU, Kawai H, Kawasaki T, Kibayashi A, Kichimi H, Kikutani E, Kim HJ, Kim SK, Kim YJ, Kinoshita K, Korpar S, Kozakai Y, Krizan P, Krokovny P, Kumar R, Kuo CC, Kuzmin A, Kwon YJ, Lee MJ, Lee SE, Lesiak T, Li J, Liu Y, Liventsev D, Mandl F, Marlow D, McOnie S, Medvedeva T, Mimashi T, Mitaroff W, Miyabayashi K, Miyake H, Miyazaki Y, Mizuk R, Mori T, Nakamura TT, Nakano E, Nakao M, Nakazawa H, Nishida S, Nitoh O, Noguchi S, Nozaki T, Ogawa S, Ogawa Y, Ohshima T, Okuno S, Olsen SL, Ozaki H, Pakhlova G, Park CW, Park H, Peak LS, Pestotnik R, Peters M, Piilonen LE, Poluektov A, Sahoo H, Sakai Y, Schneider O, Schümann J, Schwartz AJ, Seidl R, Senyo K, Sevior ME, Shapkin M, Shen CP, Shibuya H, Shidara T, Shinomiya S, Shiu JG, Shwartz B, Singh JB, Sokolov A, Somov A, Stanic S, Staric M, Sumisawa K, Sumiyoshi T, Suzuki S, Tajima O, Takasaki F, Tamura N, Tanaka M, Tawada M, Taylor GN, Teramoto Y, Tikhomirov I, Trabelsi K, Uehara S, Ueno K, Uglov T, Uno S, Urquijo P, Ushiroda Y, Usov Y, Varner G, Varvell KE, Vervink K, Villa S, Wang CC, Wang CH, Wang MZ, Watanabe Y, Wedd R, Wicht J, Won E, Yabsley BD, Yamaguchi A, Yamashita Y, Yamauchi M, Yoshida M, Yuan CZ, Yusa Y, Zhang CC, Zhang ZP, Zhilich V, Zhulanov V, and Zupanc A
- Abstract
Equal amounts of matter and antimatter are predicted to have been produced in the Big Bang, but our observable Universe is clearly matter-dominated. One of the prerequisites for understanding this elimination of antimatter is the nonconservation of charge-parity (CP) symmetry. So far, two types of CP violation have been observed in the neutral K meson (K(0)) and B meson (B(0)) systems: CP violation involving the mixing between K(0) and its antiparticle (and likewise for B(0) and ), and direct CP violation in the decay of each meson. The observed effects for both types of CP violation are substantially larger for the B(0) meson system. However, they are still consistent with the standard model of particle physics, which has a unique source of CP violation that is known to be too small to account for the matter-dominated Universe. Here we report that the direct CP violation in charged B(+/-)-->K(+/-)pi(0) decay is different from that in the neutral B(0) counterpart. The direct CP-violating decay rate asymmetry, (that is, the difference between the number of observed B(-)-->K(-)pi(0) event versus B(+)-->K(+) pi(0) events, normalized to the sum of these events) is measured to be about +7%, with an uncertainty that is reduced by a factor of 1.7 from a previous measurement. However, the asymmetry for versus B(0)-->K(+)pi(-) is at the -10% level. Although it is susceptible to strong interaction effects that need further clarification, this large deviation in direct CP violation between charged and neutral B meson decays could be an indication of new sources of CP violation-which would help to explain the dominance of matter in the Universe.
- Published
- 2008
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