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Aaij, R.; Amhis, Y.; Barsuk, S.; Callot, O.; He, J.; Kochebina, O.; Lefrançois, J.; Machefert, F.; Martin Sanchez, A.; Nicol, M.; Robbe, P.; Schune, M.-H.; Teklishyn, M.; Vallier, A.; Viaud, B.; Ben-Haim, E.; Benayoun, M.; David, P.; del Buono, L.; Martens, A.; Milanes, D.A.; Polci, F.; Adrover, C.; Aslanides, E.; Cogan, J.; Kanso, W.; Legac, R.; Leroy, O.; Mancinelli, G.; Maurice, E.; Mordà, A.; Perrin-Terrin, M.; Sapunov, M.; Serrano, J.; Tsaregorodtsev, A.; de Bonis, I.; Decamp, D.; Déléage, N.; Ghez, Ph; Hopchev, P.; Lees, J.-P.; Machikhiliyan, I.V.; Minard, M.-N.; Pietrzyk, B.; Qian, W.; t'Jampens, S.; Tisserand, V.; Tournefier, E.; Ajaltouni, Ziad Zj; Baalouch, M.; Cogneras, E.; Deschamps, O.; El Rifai, I.; Grabalosa Gándara, M.; Henrard, Pierre; Hoballah, M.; Lefèvre, R.; Li Gioi, L.; Maratas, J.; Monteil, S.; Niess, V.; Perret, Pascal; Roa Romero, Diego Alejandro
Physics letters. B, 2013, Volume: 426Journal Article
An analysis of $B^+ \to K_{\rm \scriptscriptstyle S}^0 \pi^+$ and $B^+ \to K_{\rm \scriptscriptstyle S}^0 K^+$ decays is performed with the LHCb experiment. The $pp$ collision data used correspond to integrated luminosities of $1{\,fb}^{-1}$ and $2{\,fb}^{-1}$ collected at centre-of-mass energies of $\sqrt{s}=7\mathrm{\,Te\kern -0.1em V}$ and $\sqrt{s}=8\mathrm{\,Te\kern -0.1em V}$, respectively. The ratio of branching fractions and the direct {\it CP} asymmetries are measured to be $\mathcal{B}(B^+ \to K_{\rm \scriptscriptstyle S}^0 K^+)/\mathcal{B}(B^+ \to K_{\rm \scriptscriptstyle S}^0 \pi^+) = 0.064 \pm 0.009\textrm{(stat.)} \pm 0.004\textrm{(syst.)}$, $\mathcal{A}^{\it CP}(B^+ \to K_{\rm \scriptscriptstyle S}^0 \pi^+) = -0.022 \pm 0.025\textrm{(stat.)} \pm 0.010\textrm{(syst.)}$ and $\mathcal{A}^{\it CP}(B^+ \to K_{\rm \scriptscriptstyle S}^0 K^+) = -0.21 \pm 0.14\textrm{(stat.)} \pm 0.01\textrm{(syst.)}$. The data sample taken at $\sqrt{s}=7\mathrm{\,Te\kern -0.1em V}$ is used to search for $B_c^+ \to K_{\rm \scriptscriptstyle S}^0 K^+$ decays and results in the upper limit $(f_c\cdot\mathcal{B}(B_c^+ \to K_{\rm \scriptscriptstyle S}^0 K^+))/(f_u\cdot\mathcal{B}(B^+ \to K_{\rm \scriptscriptstyle S}^0 \pi^+)) < 5.8\times10^{-2}\textrm{at 90% confidence level}$, where $f_c$ and $f_u$ denote the hadronisation fractions of a $\bar{b}$ quark into a $B_c^+$ or a $B^+$ meson, respectively.
