Observation of Large CP Violation in the Neutral B Meson System

Preprint

23 July 2001

preprint
Published by arXiv in arXiv

Abstract

We present a measurement of the Standard Model CP violation parameter sin 2phi_1 based on a 29.1 fb^{-1} data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is fully reconstructed as a J/psi Ks, psi(2S) Ks, chi_c1 Ks, eta_c Ks, J/psi K_L or J/psi K^{*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 2phi_1 = 0.99 +- 0.14(stat) +- 0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.

Keywords

NEUTRAL B MESON
STANDARD MODEL
CP VIOLATION
MESON SYSTEM
SIN 2PHI_1
J/PSI
PSI

All Related Versions

Version 1, 2001-07-23, ArXiv
Version 2, 2001-08-01, ArXiv
Version 1, 2002-02-13, ArXiv (Unconfirmed version)
Version 2, 2002-03-16, ArXiv (Unconfirmed version)
Version 3, 2002-07-03, ArXiv (Unconfirmed version)
Published version: Physical Review Letters, 87 (9), 091802.

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