Measurement of the Time-Dependent CP-Violating Asymmetry in B{sup 0}{yields}K{sub S}{sup 0}{pi}{sup 0}{gamma} Decays
- High Energy Accelerator Research Organization (KEK), Tsukuba (Japan); and others
We present a new measurement of CP-violation parameters in B{sup 0}{yields}K{sub S}{sup 0}{pi}{sup 0}{gamma} decay based on a sample of 275x10{sup 6} BB pairs collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB energy-asymmetric e{sup +}e{sup -} collider. One of the B mesons is fully reconstructed in the B{sup 0}{yields}K{sub S}{sup 0}{pi}{sup 0}{gamma} decay. The flavor of the accompanying B meson is identified from its decay products. CP-violation parameters are obtained from the asymmetry in the distribution of the proper time intervals between the two B decays. We obtain S{sub K{sub S}}{sub {sup 0}}{sub {pi}}{sub {sup 0}}{sub {gamma}}=-0.58{sub -0.38}{sup +0.46}(stat){+-}0.11(syst) and A{sub K{sub S}}{sub {sup 0}}{sub {pi}}{sub {sup 0}}{sub {gamma}}=+0.03{+-}0.34(stat){+-}0.11(syst), for the K{sub S}{sup 0}{pi}{sup 0} invariant mass covering the full range up to 1.8 GeV/c{sup 2}. We also measure the CP-violation parameters for the case B{sup 0}{yields}K*{sup 0}({yields}K{sub S}{sup 0}{pi}{sup 0}){gamma} and obtain S{sub K{sup *}}{sub {sup 0}}{sub {gamma}}=-0.79{sub -0.50}{sup +0.63}(stat){+-}0.10(syst) for A{sub K{sup *}}{sub {sup 0}}{sub {gamma}} fixed at 0.
- OSTI ID:
- 20696371
- Journal Information:
- Physical Review Letters, Vol. 94, Issue 23; Other Information: DOI: 10.1103/PhysRevLett.94.231601; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
Similar Records
Measurement of the Time-Dependent CP Asymmetries in B{sup 0}{yields}K{sub S}{sup 0}{rho}{sup 0}{gamma} Decays
First observation of radiative B{sup 0}{yields}{phi}K{sup 0}{gamma} decays and measurements of their time-dependent CP violation