Measurement of the CKM angle $γ$ and $B^0_s$-$\bar{B}^0_s$ mixing frequency with $B^0_s \rightarrow D_s^\mp h^\pm π^\pm π^\mp$ decays
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Beteta, C. Abellán
name: Ackernley, T.
name: Adeva, B.
name: Adinolfi, M.
name: Afsharnia, H.
name: Aidala, C. A.
name: Aiola, S.
name: Ajaltouni, Z.
name: Akar, S.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Albero, A. Alfonso
name: Aliouche, Z.
name: Alkhazov, G.
name: Cartelle, P. Alvarez
name: Amato, S.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Andreianov, A.
name: Andreotti, M.
name: Archilli, F.
name: Artamonov, A.
name: Artuso, M.
name: Arzymatov, K.
name: Aslanides, E.
name: Atzeni, M.
name: Audurier, B.
name: Bachmann, S.
name: Bachmayer, M.
name: Back, J. J.
name: Baker, S.
name: Rodriguez, P. Baladron
name: Balagura, V.
name: Baldini, W.
name: Leite, J. Baptista
name: Barlow, R. J.
name: Barsuk, S.
name: Barter, W.
name: Bartolini, M.
name: Baryshnikov, F.
name: Basels, J. M.
name: Bassi, G.
name: Batsukh, B.
name: Battig, A.
name: Bay, A.
name: Becker, M.
name: Bedeschi, F.
name: Bediaga, I.
name: Beiter, A.
name: Belavin, V.
name: Belin, S.
name: Bellee, V.
name: Belous, K.
name: Belov, I.
name: Belyaev, I.
name: Bencivenni, G.
name: Ben-Haim, E.
name: Berezhnoy, A.
name: Bernet, R.
name: Berninghoff, D.
name: Bernstein, H. C.
name: Bertella, C.
name: Bertholet, E.
name: Bertolin, A.
name: Betancourt, C.
name: Betti, F.
name: Bettler, M. O.
name: Bezshyiko, Ia.
name: Bhasin, S.
name: Bhom, J.
name: Bian, L.
name: Bieker, M. S.
name: Bifani, S.
name: Billoir, P.
name: Birch, M.
name: Bishop, F. C. R.
name: Bizzeti, A.
name: Bjørn, M.
name: Blago, M. P.
name: Blake, T.
name: Blanc, F.
name: Blusk, S.
name: Bobulska, D.
name: Boelhauve, J. A.
name: Garcia, O. Boente
name: Boettcher, T.
name: Boldyrev, A.
name: Bondar, A.
name: Bondar, N.
name: Borghi, S.
name: Borisyak, M.
name: Borsato, M.
name: Borsuk, J. T.
name: Bouchiba, S. A.
name: Bowcock, T. J. V.
name: Boyer, A.
name: Bozzi, C.
name: Bradley, M. J.
name: Braun, S.
name: Rodriguez, A. Brea
name: Brodski, M.
name: Brodzicka, J.
name: Gonzalo, A. Brossa
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name: Calladine, R.
name: Calvi, M.
name: Gomez, M. Calvo
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Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The CKM angle $γ$ is measured for the first time from mixing-induced $CP$ violation between $B^0_s \rightarrow D_s^\mp K^\pm π^\pm π^\mp$ and $\bar{B}^0_s \rightarrow D_s^\pm K^\mp π^\mp π^\pm$ decays reconstructed in proton-proton collision data corresponding to an integrated luminosity of 9 ${\rm fb}^{-1}$ recorded with the LHCb detector. A time-dependent amplitude analysis is performed to extract the $CP$-violating weak phase $γ-2β_s$ and, subsequently, $γ$ by taking the $B^0_s$-$\bar{B}^0_s$ mixing phase $β_{s}$ as an external input. The measurement yields $γ= (44 \pm 12)^\circ$ modulo $180^\circ$, where statistical and systematic uncertainties are combined. An alternative model-independent measurement, integrating over the five-dimensional phase space of the decay, yields $γ= (44^{\,+\,20}_{\,-\,13})^\circ$ modulo $180^\circ$. Moreover, the $B^0_s$-$\bar{B}^0_s$ oscillation frequency is measured from the flavour-specific control channel $B^0_s \rightarrow D_s^- π^+ π^+ π^-$ to be $Δm_s = (17.757 \pm 0.007 \,({\rm stat.}) \pm 0.008 \,({\rm syst.})) \text{ps}^{-1}$, consistent with and more precise than the current world-average value.
description: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-030.html (LHCb public pages)