Observation of Large CP Violation in the Neutral B Meson System

2001/07/31 by K. Abe, The Belle Collaboration · 2 citations
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevlett.87.091802

published as Phys.Rev.Lett.87:091802,2001 · 4 figures, to appear in Phys. Rev. Letters

arxiv created 2001/08/01 · arxiv updated 2010/05/28

Abstract

We present a measurement of the Standard Model CP violation parameter sin 2phi₁ 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 2phi₁ = 0.99 +- 0.14(stat) +- 0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.

Cited by

• New horizon in particle physics: first observation of CP violation in baryon decays
• CP-violation and U-spin symmetry in four-body bottom baryon decays