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Search forXYZstates inϒ(1S)inclusive decays
Shen, C. P.,Yuan, C. Z.,Ban, Y.,Aihara, H.,Asner, D. M.,Badhrees, I.,Bakich, A. M.,Barberio, E.,Behera, P.,Bhardwaj, V.,Bhuyan, B.,Biswal, J.,Bondar, A.,Bonvicini, G.,Bozek, A.,Brač,ko, M.,Browde American Physical Society 2016 Physical Review D Vol.93 No.11
<P>The branching fractions of the Upsilon(1S) inclusive decays into final states with a J/psi or psi(2S) are measured with improved precision to be B Upsilon(1S) -> J/psi + anything = (5.25 +/- 0.13(stat) +/- 0.25(syst) x 10(-4) and B Upsilon(1S) -> psi(2S) + anything = (1.23 +/- 0.17(stat) +/- 0.11(syst)) x 10(-4). The first search for Upsilon(1S) decays into XYZ states that decay into a J/psi or a psi(2S) plus one or two charged tracks yields no significant signals for XYZ states in any of the examined decay modes, and upper limits on their production rates in Upsilon(1S) inclusive decays are determined.</P>
Search for a massive invisible particleX0inB+→e+X0andB+→μ+X0decays
Park, C.-S.,Kwon, Y.-J.,Adachi, I.,Aihara, H.,Asner, D. M.,Aushev, T.,Babu, V.,Badhrees, I.,Bakich, A. M.,Barberio, E.,Behera, P.,Bhardwaj, V.,Biswal, J.,Bonvicini, G.,Bozek, A.,Brač,ko, M.,Browd American Physical Society 2016 Physical Review D Vol.94 No.1
<P>We present a search for a non-Standard-Model invisible particle X-0 in the mass range 0.1-1.8 GeV/c(2) in B+ -> e(+)X(0) and B+ -> mu X-+(0) decays. The results are obtained from a 711 fb(-1) data sample that corresponds to 772 x 10(6) B (B) over bar pairs, collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. One B meson is fully reconstructed in a hadronic mode to determine the momentum of the lepton of the signal decay in the rest frame of the recoiling partner B meson. We find no evidence of a signal and set upper limits on the order of 10(-6).</P>