A flavour-tagged decay-time-dependent amplitude analysis of B0s → (K+ π−)(K− π+) decays is presented in the K± π∓ mass range from 750 to 1600 MeV/c^2. The analysis uses pp collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb^−1. Several quasi-two-body decay modes are considered, corresponding to K± π∓ combinations with spin 0, 1 and 2, which are dominated by the K0*(800)0 and K0*(1430)0, the K*(892)0 and the K2*(1430)0 resonances, respectively. The longitudinal polarisation fraction for the B0s → K∗(892)0 anti-K∗(892)0 decay is measured as f_L = 0.208 ± 0.032 ± 0.046, where the first uncertainty is statistical and the second is systematic. The first measurement of the mixing-induced CP-violating phase, ϕ_s^{d anti-d}, in b → d anti-d s transitions is performed, yielding a value of ϕ_s^{d anti-d} = −0.10 ± 0.13(stat) ± 0.14(syst) rad.

Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2018). First Measurement of the CP-Violating Phase ϕ_s^{d anti-d} in B0s → (K+ π−)(K− π+) Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(3), 0-31 [10.1007/JHEP03(2018)140].

First Measurement of the CP-Violating Phase ϕ_s^{d anti-d} in B0s → (K+ π−)(K− π+) 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 flavour-tagged decay-time-dependent amplitude analysis of B0s → (K+ π−)(K− π+) decays is presented in the K± π∓ mass range from 750 to 1600 MeV/c^2. The analysis uses pp collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3.0 fb^−1. Several quasi-two-body decay modes are considered, corresponding to K± π∓ combinations with spin 0, 1 and 2, which are dominated by the K0*(800)0 and K0*(1430)0, the K*(892)0 and the K2*(1430)0 resonances, respectively. The longitudinal polarisation fraction for the B0s → K∗(892)0 anti-K∗(892)0 decay is measured as f_L = 0.208 ± 0.032 ± 0.046, where the first uncertainty is statistical and the second is systematic. The first measurement of the mixing-induced CP-violating phase, ϕ_s^{d anti-d}, in b → d anti-d s transitions is performed, yielding a value of ϕ_s^{d anti-d} = −0.10 ± 0.13(stat) ± 0.14(syst) rad.
2018
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2018). First Measurement of the CP-Violating Phase ϕ_s^{d anti-d} in B0s → (K+ π−)(K− π+) Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2018(3), 0-31 [10.1007/JHEP03(2018)140].
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/11585/640493
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