Abstract: We report an indirect search for nonstandard model physics using the flavor-changing neutral current decays B ! Kð
Þ
þ
. We reconstruct the decays and measure their angular distributions, as a function of q2 ¼ M2

c2, where M

is the dimuon mass, in pp
collisions at ffiffis p ¼ 1:96 TeV using a data sample corresponding to an integrated luminosity of 6:8 fb1. The transverse polarization asymmetry Að2ÞT and the time-reversal-odd charge-and-parity asymmetry Aim are measured for the first time, together with the K
longitudinal polarization fraction FL and the muon forward-backward asymmetry AFB for the decays B0 ! K
0
þ
and Bþ ! K
þ
þ
. The B ! K

þ
forward-backward asymmetry in the most sensitive kinematic regime, 1 q2 < 6 GeV2=c2, is measured to be AFB ¼ 0:29þ0:20 0:23ðstatÞ  0:07ðsystÞ, the most precise result to date. No deviations from the standard model predictions are observed.

Autoría

Descargar referencia