Observation of large CP violation in the neutral meson system
Jul, 200112 pages
Published in:
- Phys.Rev.Lett. 87 (2001) 091802
e-Print:
- hep-ex/0107061 [hep-ex]
PDG: sin
Report number:
- KEK-PREPRINT-2001-50,
- BELLE-PREPRINT-2001-10
Experiments:
Citations per year
Abstract: (arXiv)
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.Note:
- 4 figures, to appear in Phys. Rev. Letters Report-no: KEK Preprint 2001-50, Belle Preprint 2001-10
- electron positron: colliding beams
- electron positron: annihilation
- Upsilon(10570): electroproduction
- B: pair production
- B: hadronic decay
- anti-B0: hadronic decay
- CP: violation
- time dependence
- CKM matrix: unitarity
- charmonium
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