E-viri
PDF
Recenzirano
Odprti dostop
-
Ajaltouni, Z.; Amhis, Y.; An, L.; Anderlini, L.; Andreotti, M.; Aquines Gutierrez, O.; Barlow, R.J.; Beddow, J.; Belyaev, I.; Ben-Haim, E.; Bencivenni, G.; van Beuzekom, M.; Blouw, J.; Bocci, V.; Britsch, M.; Britton, T.; Buytaert, J.; Cadeddu, S.; Campana, P.; Carboni, G.; Cardinale, R.; Carson, L.; Cenci, R.; Charpentier, Ph; Cheung, S.-F.; Cogan, J.; Cojocariu, L.; Comerma-Montells, A.; Couturier, B.; De Miranda, J.M.; De Simone, P.; Di Canto, A.; Donleavy, S.; Dovbnya, A.; Dujany, G.; Egede, U.; Falabella, A.; Fol, P.; Fu, J.; Gavardi, L.; Göbel, C.; Golutvin, A.; Grecu, A.; Gushchin, E.; Hansmann-Menzemer, S.; He, J.; Henry, L.; van Herwijnen, E.; Hill, D.; Hoballah, M.; Jacobsson, R.; Klimaszewski, K.; Kreplin, K.; Kurek, K.; Lafferty, G.; Langenbruch, C.; Likhomanenko, T.; Marchand, J.F.; Marconi, U.; McNab, A.; Mordà, A.; Mussini, M.; Neri, N.; Nikitin, N.; Palombo, F.; Panman, J.; Parkes, C.; Patel, M.; Pilař, T.; Potterat, C.; Price, E.; Pritchard, A.; Raven, G.; Rihl, M.; Rives Molina, V.; Rouvinet, J.; Saborido Silva, J.J.; Schmelling, M.; Schopper, A.; Shekhtman, L.; Simi, G.; Smith, E.; Smith, M.; Sokoloff, M.D.; Stracka, S.; Stroili, R.; Thomas, C.; Tomassetti, L.; Tournefier, E.; Ubeda Garcia, M.; Vacca, C.; Vázquez Sierra, C.; Vieira, D.; Vorobyev, V.; Wallace, C.; Wang, J.; Wilson, F.F.; Wormser, G.; Xing, Z.; Zhang, L.
Physics letters. B, 04/2015, Letnik: 743Journal Article
A search for the rare decays Bs0→π+π−μ+μ− and B0→π+π−μ+μ− is performed in a data set corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector in proton–proton collisions at centre-of-mass energies of 7 and 8 TeV. Decay candidates with pion pairs that have invariant mass in the range 0.5–1.3 GeV/c2 and with muon pairs that do not originate from a resonance are considered. The first observation of the decay Bs0→π+π−μ+μ− and the first evidence of the decay B0→π+π−μ+μ− are obtained and the branching fractions, restricted to the dipion-mass range considered, are measured to be B(Bs0→π+π−μ+μ−)=(8.6±1.5 (stat)±0.7 (syst)±0.7(norm))×10−8 and B(B0→π+π−μ+μ−)=(2.11±0.51(stat)±0.15(syst)±0.16(norm))×10−8, where the third uncertainty is due to the branching fraction of the decay B0→J/ψ(→μ+μ−)K⁎(892)0(→K+π−), used as a normalisation.
