Brandenburg G, Ershov A, Gao YS, Kim DY, Wilson R, Browder TE, Li Y, Rodriguez JL, Yamamoto H, Bergfeld T, Eisenstein BI, Ernst J, Gladding GE, Gollin GD, Hans RM, Johnson E, Karliner I, Marsh MA, Palmer M, Plager C, Sedlack C, Selen M, Thaler JJ, Williams J, Edwards KW, Janicek R
Southern Methodist University, Dallas, Texas 75725, USA.
Phys Rev Lett. 2000 Jun 5;84(23):5283-7. doi: 10.1103/PhysRevLett.84.5283.
We have studied exclusive, radiative B meson decays to charmless mesons in 9.7x10(6) B&Bmacr; decays accumulated with the CLEO detector. We measure B(B0-->K(0)(892)gamma) = (4.55(+0.72)(-0. 68)+/-0.34)x10(-5) and B(B+-->K(+)(892)gamma) = (3.76(+0.89)(-0. 83)+/-0.28)x10(-5). We have searched for CP asymmetry in B-->K()(892)gamma decays and measure A(CP) = +0.08+/-0.13+/-0.03. We report the first observation of B-->K()(2)(1430)gamma decays with a branching fraction of (1.66(+0.59)(-0.53)+/-0.13)x10(-5). No evidence for the decays B-->rhogamma and B0-->omegagamma is found and we limit B(B-->(rho/omega)gamma)/B(B-->K(*)(892)gamma)<0.32 at 90% C.L.
我们利用CLEO探测器积累的9.7×10⁶个B⁰B⁻衰变事例，研究了B介子到无粲介子的单举辐射衰变。我们测量了B(B⁰→K⁺⁰(892)γ) = (4.55(+0.72)(-0.68)±0.34)×10⁻⁵和B(B⁺→K⁺⁺(892)γ) = (3.76(+0.89)(-0.83)±0.28)×10⁻⁵。我们在B→K⁺⁰(892)γ衰变中寻找CP不对称性，并测量得A(CP) = +0.08±0.13±0.03。我们首次观测到B→K⁺⁰(2)(1430)γ衰变，其分支比为(1.66(+0.59)(-0.53)±0.13)×10⁻⁵。未发现B→ργ和B⁰→ωγ衰变的证据，我们在90%置信水平下将B(B⁻→(ρ/ω)γ)/B(B→K⁺⁰(892)γ)限制在小于0.32 。
