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26 April 2024

» arxiv » 1201.3502

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Measurement of the CP-violation Parameter sin2$phi_1$ with a New Tagging Method at the $Upsilon(5S)$ Resonance
Belle Collaboration ; Y. Sato ; H. Yamamoto ; H. Aihara ; D. M. Asner ; V. Aulchenko ; T. Aushev ; T. Aziz ; A. M. Bakich ; V. Bhardwaj ; B. Bhuyan ; M. Bischofberger ; A. Bondar ; A. Bozek ; M. Bračko ; T. E. Browder ; P. Chang ; P. Chen ; B. G. Cheon ; K. Chilikin ; R. Chistov ; I.-S. Cho ; K. Cho ; S.-K. Choi ; Y. Choi ; J. Dalseno ; Z. Doležal ; Z. Drásal ; S. Eidelman ; D. Epifanov ; J. E. Fast ; V. Gaur ; N. Gabyshev ; Y. M. Goh ; B. Golob ; J. Haba ; T. Hara ; K. Hayasaka ; H. Hayashii ; Y. Horii ; Y. Hoshi ; W.-S. Hou ; H. J. Hyun ; A. Ishikawa ; R. Itoh ; M. Iwabuchi ; Y. Iwasaki ; T. Iwashita ; T. Julius ; P. Kapusta ; T. Kawasaki ; H. Kichimi ; C. Kiesling ; H. J. Kim ; H. O. Kim ; J. B. Kim ; J. H. Kim ; K. T. Kim ; M. J. Kim ; S. K. Kim ; Y. J. Kim ; K. Kinoshita ; B. R. Ko ; N. Kobayashi ; P. Kodyš ; S. Korpar ; P. Križan ; P. Krokovny ; T. Kuhr ; R. Kumar ; T. Kumita ; A. Kuzmin ; Y.-J. Kwon ; J. S. Lange ; S.-H. Lee ; J. Li ; Y. Li ; C. Liu ; Z. Q. Liu ; R. Louvot ; S. McOnie ; K. Miyabayashi ; H. Miyata ; R. Mizuk ; G. B. Mohanty ; A. Moll ; N. Muramatsu ; E. Nakano ; M. Nakao ; Z. Natkaniec ; S. Nishida ; K. Nishimura ; O. Nitoh ; S. Ogawa ; T. Ohshima ; S. Okuno ; S. L. Olsen ; Y. Onuki ; W. Ostrowicz ; P. Pakhlov ; G. Pakhlova ; C. W. Park ; H. Park ; H. K. Park ; T. K. Pedlar ; M. Petrič ; L. E. Piilonen ; A. Poluektov ; M. Röhrken ; S. Ryu ; H. Sahoo ; Y. Sakai ; T. Sanuki ; O. Schneider ; C. Schwanda ; A. J. Schwartz ; R. Seidl ; K. Senyo ; O. Seon ; M. E. Sevior ; M. Shapkin ; C. P. Shen ; T.-A. Shibata ; J.-G. Shiu ; B. Shwartz ; A. Sibidanov ; F. Simon ; P. Smerkol ; Y.-S. Sohn ; A. Sokolov ; E. Solovieva ; S. Stanič ; M. Starič ; J. Stypula ; M. Sumihama ; T. Sumiyoshi ; S. Tanaka ; G. Tatishvili ; Y. Teramoto ; K. Trabelsi ; M. Uchida ; T. Uglov ; Y. Unno ; S. Uno ; P. Urquijo ; G. Varner ; K. E. Varvell ; C. H. Wang ; M.-Z. Wang ; P. Wang ; X. L. Wang ; M. Watanabe ; Y. Watanabe ; J. Wicht ; E. Won ; B. D. Yabsley ; Y. Yamashita ; Y. Yusa ; Z. P. Zhang ; V. Zhilich ; V. Zhulanov ; A. Zupanc ;
Date:	17 Jan 2012
Abstract:	We report a measurement of the CP-violation parameter sin2$phi_1$ at the $Upsilon(5S)$ resonance using a new tagging method, called "$B$-$pi$ tagging." In $Upsilon(5S)$ decays containing a neutral $B$ meson, a charged $B$, and a charged pion, the neutral $B$ is reconstructed in the $J/psi K_S^0$ CP-eigenstate decay channel. The initial flavor of the neutral $B$ meson at the moment of the $Upsilon(5S)$ decay is opposite to that of the charged $B$ and may thus be inferred from the charge of the pion without reconstructing the charged $B$. From the asymmetry between $B$-$pi^+$ and $B$-$pi^-$ tagged $J/psi K_S^0$ yields, we determine sin2$phi_1$ = 0.57 $pm$ 0.58(stat) $pm$ 0.06(syst). The results are based on 121 fb$^{-1}$ of data recorded by the Belle detector at the KEKB $e^+ e^-$ collider.
Source:	arXiv, 1201.3502
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