A search for B+ → Ds+ K+ K− decays is performed using pp collision data corresponding to an integrated luminosity of 4.8 fb^−1, collected at centre-of-mass energies of 7, 8 and 13 TeV with the LHCb experiment. A significant signal is observed for the first time and the branching fraction is determined to be B(B+ → Ds+ K+ K−) = (7.1 ± 0.5 ± 0.6 ± 0.7) × 10^−6, where the first uncertainty is statistical, the second systematic and the third due to the uncertainty on the branching fraction of the normalisation mode B+ → Ds+ anti-D0. A search is also performed for the pure annihilation decay B+ → Ds+ ϕ. No significant signal is observed and a limit of B(B+ → Ds+ ϕ) < 4.9 × 10^−7 (4.2 × 10^−7) is set on the branching fraction at 95% (90%) confidence level.

Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2018). First Observation of B+ → Ds+ K+ K− Decays and a Search for B+ → Ds+ ϕ Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(1), 0-21 [10.1007/JHEP01(2018)131].

First Observation of B+ → Ds+ K+ K− Decays and a Search for B+ → Ds+ ϕ Decays

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Marconi, U.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2018

Abstract

A search for B+ → Ds+ K+ K− decays is performed using pp collision data corresponding to an integrated luminosity of 4.8 fb^−1, collected at centre-of-mass energies of 7, 8 and 13 TeV with the LHCb experiment. A significant signal is observed for the first time and the branching fraction is determined to be B(B+ → Ds+ K+ K−) = (7.1 ± 0.5 ± 0.6 ± 0.7) × 10^−6, where the first uncertainty is statistical, the second systematic and the third due to the uncertainty on the branching fraction of the normalisation mode B+ → Ds+ anti-D0. A search is also performed for the pure annihilation decay B+ → Ds+ ϕ. No significant signal is observed and a limit of B(B+ → Ds+ ϕ) < 4.9 × 10^−7 (4.2 × 10^−7) is set on the branching fraction at 95% (90%) confidence level.
2018
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2018). First Observation of B+ → Ds+ K+ K− Decays and a Search for B+ → Ds+ ϕ Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(1), 0-21 [10.1007/JHEP01(2018)131].
Aaij, R.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Ali, S.; Alkhazov, G.; Alvar...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/627842
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