First measurement of the CP-violating phase $$ {\phi}_s^{d\overline{d}} $$ in B0 s → (K+π−)(K−π+) decays

Media type: E-Article

Title: First measurement of the CP-violating phase $$ {\phi}_s^{d\overline{d}} $$ in B0 s → (K+π−)(K−π+) decays

Contributor: Aaij, R.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alves, A. A.; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; Andreassi, G.; Andreotti, M.; Andrews, J. E.; Appleby, R. B.; Archilli, F.; d’Argent, P.; [...]

Published: Springer Science and Business Media LLC, 2018

Language: English

DOI: 10.1007/jhep03(2018)140

ISSN: 1029-8479

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Description: Abstract A flavour-tagged decay-time-dependent amplitude analysis of B s 0 → (K + π −)(K − π +) decays is presented in the K ± π ∓ mass range from 750 to 1600MeV/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 K 0 * (800)0 and K 0 * (1430)0, the K *(892)0 and the K 2 * (1430)0 resonances, respectively. The longitudinal polarisation fraction for the $$ {B}_s^0\to {K}^{\ast }(892){}^{\circ}{\overline{K}}^{\ast }{(892)}^0 $$ B s 0 → K ∗ 892 ° 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, $$ {\phi}_s^{d\overline{d}} $$ ϕ s d d ¯ , in $$ b\to d\overline{d}s $$ b → d d ¯ s transitions is performed, yielding a value of $$ {\phi}_s^{d\overline{d}}=-0.10\pm 0.13\left(\mathrm{stat}\right)\pm 0.14 $$ ϕ s d d ¯ = − 0.10 ± 0.13 stat ± 0.14 (syst) rad.

Access State: Open Access

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