Measurements of Branching Fractions and Direct CP Asymmetries for B -> K pi, B->pi pi and B->to KK Decays

Y.-T. Duh , T.-Y. Wu , P. Chang , G. B. Mohanty , Y. Unno , I. Adachi , H. Aihara , D. M. Asner

show 135 more authors

V. Aulchenko T. Aushev T. Aziz A. M. Bakich B. Bhuyan M. Bischofberger A. Bondar G. Bonvicini A. Bozek M. Bracko T. E. Browder Y. Chao V. Chekelian A. Chen P. Chen B. G. Cheon I.-S. Cho K. Cho V. Chobanova Y. Choi Z. Dolezal A. Drutskoy D. Dutta S. Eidelman H. Farhat J. E. Fast A. Frey V. Gaur R. Gillard Y. M. Goh B. Golob J. Haba K. Hayasaka H. Hayashii Y. Horii Y. Hoshi W.-S. Hou Y. B. Hsiung H. J. Hyun T. Iijima A. Ishikawa T. Julius J. H. Kang P. Kapusta T. Kawasaki H. J. Kim H. O. Kim J. H. Kim M. J. Kim Y. J. Kim K. Kinoshita B. R. Ko P. Kodys S. Korpar P. Krizan P. Krokovny T. Kuhr R. Kumar T. Kumita A. Kuzmin Y.-J. Kwon S.-H. Lee Y. Li J. Libby C. Liu Y. Liu K. Miyabayashi H. Miyata R. Mizuk T. Mori N. Muramatsu E. Nakano M. Nakao C. Ng S. Nishida K. Nishimura O. Nitoh S. Ogawa T. Ohshima S. Okuno G. Pakhlova H. Park H. K. Park T. K. Pedlar R. Pestotnik M. Petric L. E. Piilonen M. Prim M. Ritter M. Rohrken S. Ryu H. Sahoo Y. Sakai S. Sandilya D. Santel Y. Sato O. Schneider C. Schwanda K. Senyo M. E. Sevior M. Shapkin V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz A. Sibidanov F. Simon P. Smerkol Y.-S. Sohn A. Sokolov E. Solovieva M. Staric M. Sumihama T. Sumiyoshi G. Tatishvili Y. Teramoto K. Trabelsi M. Uchida S. Uehara S. Uno P. Vanhoefer G. Varner A. Vinokurova C. H. Wang M.-Z. Wang M. Watanabe K. M. Williams E. Won B. D. Yabsley Y. Yamashita Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc

Authors on Pith no claims yet

classification ✦ hep-ex

keywords gammadecayssigmasignificancebranchingfractionsasymmetriesbelle

0 comments

read the original abstract

We report measurements of the branching fractions and direct CP asymmetries (A_{CP}) for B->K pi, pi pi and KK decays (but not pi^0 pi^0) based on the final data sample of 772x10^6 B B-bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+ e^- collider. We set a 90% confidence-level upper limit for K^+- K^-+ at 2.0x10^{-7}; all other decays are observed with branching fractions ranging from 10^{-6} to 10^{-5}. In the $B^0/B^0-bar -> K^+-\pi^-+ mode, we confirm Belle's previously reported large A_{CP} with a value of -0.069 +- 0.014 +- 0.007 and a significance of 4.4 sigma. For all other flavor-specific modes, we find A_{CP} values consistent with zero, including A_{CP}(K^+- \pi^0) = +0.043 +- 0.024 +- 0.007 with 1.8 sigma significance. The difference of CP asymmetry between B^+- -> K^+- pi^0 and B^0/B^0-bar -> K^+-\pi^-+ is found to be Delta A_{K pi} equiv A_{CP} (K^+ pi^0) - A_{CP}(K^+ pi^-) = +0.112 +- 0.027 +- 0.007 with 4.0 sigma significance. We also calculate the ratios of partial widths for the B-> K pi decays. Using our results, we test the validity of the sum rule A_{CP}(K^+ pi^-) + A_{CP}(K^0\pi^+) x Gamma(K^0\pi^+)/Gamma(K^+ pi^-)} - A_{CP}(K^+ pi^0)x 2Gamma(K^+ pi^0)/Gamma(K^+ pi^-) - A_{CP}(K^0 pi^0)x 2Gamma(K^0 pi^0)/Gamma(K^+ pi^-) = 0 and obtain a sum of -0.270 +- 0.132 +- 0.060 with 1.9 sigma significance.

This paper has not been read by Pith yet.

discussion (0)

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

CP asymmetries in charged meson decay to two pions
hep-ph 2026-05 unverdicted novelty 4.0

CP asymmetries for B+ to pi+ pi0, D+ to pi+ pi0, and K+ to pi+ pi0 are estimated in the Standard Model at roughly 3 times 10 to the -3, 10 to the -5, and 10 to the -6 using a unified formalism for isospin violation.