Measurements of the branching fractions for B(s)->D(s)πππ and Λb0->Λc+πππ

Unknown, Article, Preprint English OPEN
Back, J. J. ; Dossett, D. ; Gershon, T. J. ; Harrison, P. F. ; Kreps, Michal ; Latham, Thomas ; Pilar, T. ; Poluektov, Anton ; Reid, Matthew M. ; Whitehead, M. (Mark) ; Williams, M. P. ; HASH(0x561a12a52970) (2011)

A measurement of the $C\!P$ asymmetry in $B^+ \rightarrow K^+ \mu^+ \mu^-$ decays is presented using $pp$ collision data, corresponding to an integrated luminosity of 1.0 fb $^{-1}$, recorded by the LHCb experiment during 2011 at a centre-of-mass energy of 7 TeV. The measurement is performed in seven bins of $\mu^+ \mu^-$ invariant mass squared in the range 0.05 < $q^{2}$ < 22.00 GeV$^{2}/c^4$, excluding the ${J\mskip -3mu/\mskip -2mu \psi\mskip 2mu}$ and $\psi{(2S)}$ resonance regions. Production and detection asymmetries are corrected for using the $B^+ \rightarrow J\mskip -3mu/\mskip -2mu \psi\mskip 2mu K^+$ decay as a control mode. Averaged over all the bins, the $C\!P$ asymmetry is found to be ${{\cal A}_{C\!P} = 0.000\pm 0.033\mbox{ (stat.)} \pm0.005 \mbox{ (syst.)} \pm 0.007\mbox{ }(J\mskip -3mu/\mskip -2mu \psi\mskip 2mu K^+)}$, where the third uncertainty is due to the $C\!P$ asymmetry of the control mode. This is consistent with the Standard Model prediction.