Using a dataset corresponding to an integrated luminosity of 3.0 fb^−1 collected in pp collisions at centre-of-mass energies of 7 and 8 TeV, the B0s → ϕ ϕ branching fraction is measured to be B(B0s → ϕ ϕ) = (1.84 ± 0.05(stat) ± 0.07(syst) ± 0.11(fs/fd) ± 0.12(norm)) × 10^−5, where f_s/f_d represents the ratio of the B0s to B0 production cross-sections, and the B0 → ϕ K*(892)0 decay mode is used for normalization. This is the most precise measurement of this branching fraction to date, representing a factor five reduction in the statistical uncertainty compared with the previous best measurement. A search for the decay B0 → ϕ ϕ is also made. No signal is observed, and an upper limit on the branching fraction is set as B(B0 → ϕ ϕ) < 2.8 × 10^−8 at 90% confidence level. This is a factor of seven improvement compared to the previous best limit.

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2015). Measurement of the B0s → ϕ ϕ Branching Fraction and Search for the Decay B0 → ϕ ϕ. JOURNAL OF HIGH ENERGY PHYSICS, 2015(10), 0-17 [10.1007/JHEP10(2015)053].

Measurement of the B0s → ϕ ϕ Branching Fraction and Search for the Decay B0 → ϕ ϕ

Capriotti, L.;CARBONE, ANGELO;FERRARI, FABIO;GALLI, DOMENICO;MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;ZUCCHELLI, STEFANO
2015

Abstract

Using a dataset corresponding to an integrated luminosity of 3.0 fb^−1 collected in pp collisions at centre-of-mass energies of 7 and 8 TeV, the B0s → ϕ ϕ branching fraction is measured to be B(B0s → ϕ ϕ) = (1.84 ± 0.05(stat) ± 0.07(syst) ± 0.11(fs/fd) ± 0.12(norm)) × 10^−5, where f_s/f_d represents the ratio of the B0s to B0 production cross-sections, and the B0 → ϕ K*(892)0 decay mode is used for normalization. This is the most precise measurement of this branching fraction to date, representing a factor five reduction in the statistical uncertainty compared with the previous best measurement. A search for the decay B0 → ϕ ϕ is also made. No signal is observed, and an upper limit on the branching fraction is set as B(B0 → ϕ ϕ) < 2.8 × 10^−8 at 90% confidence level. This is a factor of seven improvement compared to the previous best limit.
2015
Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2015). Measurement of the B0s → ϕ ϕ Branching Fraction and Search for the Decay B0 → ϕ ϕ. JOURNAL OF HIGH ENERGY PHYSICS, 2015(10), 0-17 [10.1007/JHEP10(2015)053].
Aaij, R.; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Cartelle, P...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/516453
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