First measurement of the CP-violating phase ϕ[superscript d[bar over d]][subscript ] in B[subscript s]superscript 0] → (K[superscript +]π[superscript −])(K[superscript −]π[superscript +]) decays
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
March 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration, et al. “First Measurement of the CP-Violating Phase ϕ [subscript s][superscript d[bar over d]] in B[subscript s][superscript 0] → (K[superscript +]π[superscript −])(K[superscript −]π[superscript +]) Decays.” Journal of High Energy Physics, vol. 2018, no. 3, Mar. 2018. © 2018 The Authors
Version
Final published version
Abstract
A flavour-tagged decay-time-dependent amplitude analysis of B[subscript s][superscript 0] → (K[superscript +]π[superscript −])(K[superscript −]π[superscript +]) decays is presented in the K[superscript ±]π[superscript ∓] mass range from 750 to 1600MeV/c[superscript 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[superscript −1]. Several quasi-two-body decay modes are considered, corresponding to K[superscript ±]π[superscript ∓] combinations with spin 0, 1 and 2, which are dominated by the K[subscript 0][superscript *] (800)0 and K[superscript 0][superscript *] (1430)0, the K[superscript *](892)[superscript 0] and the K[subscript 2][superscript *] (1430)0 resonances, respectively. The longitudinal polarisation fraction for the B[superscript 0][superscript s]→K[superscript ∗](892)[superscript ∘][bar∗ over K](892)[superscript 0] decay is measured as fL = 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[superscript d[bar over d]][subscript s], in b→d[bar over d]s transitions is performed, yielding a value of ϕ[superscript d[bar over d]]s=−0.10±0.13(stat)±0.14 (syst) rad. Keywords:
CP violation, Flavour Changing Neutral, Currents, B physics, Oscillation Hadron-Hadron scattering (experiments)
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution
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DOI of Published Version
http://dx.doi.org/10.1007/JHEP03(2018)140
