An analysis of B+→K<inf>S</inf>0π+ ; B+→K<inf>S</inf>0K+ decays is performed with the LHCb experiment. The pp collision data used correspond to integrated luminosities of 1fb-1 ; 2fb-1 collected at centre-of-mass energies of √s=7TeV ; √s=8TeV, respectively. The ratio of branching fractions ; the direct CP asymmetries are measured to be B(B+→K<inf>S</inf>0K+)/B(B+→K<inf>S</inf>0π+)=0.064±0.009 (stat.)±0.004(syst.), ACP(B+→K<inf>S</inf>0π+)=-0.022±0.025(stat.)±0.010 (syst.) ; ACP(B+→K<inf>S</inf>0K+)=-0.21±0.14 (stat.)±0.01 (syst.). The data sample taken at √s=7 TeV is used to search for B<inf>c</inf>+→K<inf>S</inf>0K+ decays ; results in the upper limit (f<inf>c</inf>dot operatorB(B<inf>c</inf>+→K<inf>S</inf>0K+))/(fudot operatorB(B+→K<inf>S</inf>0π+))<5.8×10-2 at 90% confidence level, where f<inf>c</inf> ; f<inf>u</inf> denote the hadronisation fractions of a b- quark into a Bc+ or a B+ meson, respectively. © 2013 CERN.
Branching fraction ; CP asymmetry of the decays B+→KS 0π+ ; B+→KS 0K+
PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2013-01-01
Abstract
An analysis of B+→KI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.