In a search for B -> c cbar gamma K decays with the BABAR detector, where c cbar include J/psi and psi (2S), and K includes K+-, K0S, and Kstar (892), we find evidence for X(3872) -> J/psi gamma and X (3872) -> psi (2S) gamma with 3.6 sigma and 3.5 significance, respectively. We measure the product of branching fractions Br(B+-->X(3872) K+-)XBr(X(3872)->J/psi gamma) = [2.8+-o.8(stat)+-0.1(sist)]X10^-6 and Br(B+-->X(3872)K+-)XBr(X(3872)->psi(2S)gamma) = {9.5+-2.7(stat)+-0.6(syst)]X10^-6.
Evidence for X(3872) to psi_2S gamma in B+- to X_3872 K+- decays, and a study of B to c cbar gamma K / DE NARDO, Guglielmo; Lista, L.; Monorchio, Diego; Onorato, Giovanni; Sciacca, Crisostomo. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 102:(2009), pp. 132001-1-132001-7. [10.1103/PhysRevLett.102.132001]
Evidence for X(3872) to psi_2S gamma in B+- to X_3872 K+- decays, and a study of B to c cbar gamma K
DE NARDO, GUGLIELMO;L. Lista;MONORCHIO, DIEGO;ONORATO, giovanni;SCIACCA, CRISOSTOMO
2009
Abstract
In a search for B -> c cbar gamma K decays with the BABAR detector, where c cbar include J/psi and psi (2S), and K includes K+-, K0S, and Kstar (892), we find evidence for X(3872) -> J/psi gamma and X (3872) -> psi (2S) gamma with 3.6 sigma and 3.5 significance, respectively. We measure the product of branching fractions Br(B+-->X(3872) K+-)XBr(X(3872)->J/psi gamma) = [2.8+-o.8(stat)+-0.1(sist)]X10^-6 and Br(B+-->X(3872)K+-)XBr(X(3872)->psi(2S)gamma) = {9.5+-2.7(stat)+-0.6(syst)]X10^-6.| File | Dimensione | Formato | |
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