Using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb^-1, recorded by the LHCb detector at center-of-mass energies of 7 and 8 TeV, the B_c^+→D^0K^+ decay is observed with a statistical significance of 5.1 standard deviations. By normalizing to B^+→D[over ¯]^0π^+ decays, a measurement of the branching fraction multiplied by the production rates for B_c^+ relative to B^+ mesons in the LHCb acceptance is obtained, R_D^0K=(f_c/f_u)×B(B_c^+→D^0K^+)=(9.3_-2.5^+2.8±0.6)×10^-7, where the first uncertainty is statistical and the second is systematic. This decay is expected to proceed predominantly through weak annihilation and penguin amplitudes, and is the first B_c^+ decay of this nature to be observed.
Observation of B_c^+→D^0K^+ Decays
Veltri, M;
2017
Abstract
Using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb^-1, recorded by the LHCb detector at center-of-mass energies of 7 and 8 TeV, the B_c^+→D^0K^+ decay is observed with a statistical significance of 5.1 standard deviations. By normalizing to B^+→D[over ¯]^0π^+ decays, a measurement of the branching fraction multiplied by the production rates for B_c^+ relative to B^+ mesons in the LHCb acceptance is obtained, R_D^0K=(f_c/f_u)×B(B_c^+→D^0K^+)=(9.3_-2.5^+2.8±0.6)×10^-7, where the first uncertainty is statistical and the second is systematic. This decay is expected to proceed predominantly through weak annihilation and penguin amplitudes, and is the first B_c^+ decay of this nature to be observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
