Measurement of CP asymmetry in $$ {\textrm{B}}_{\textrm{s}}^0\to {\textrm{D}}_{\textrm{s}}^{\mp }{\textrm{K}}^{\pm } $$ decays
CP violation
DOI:
10.1007/jhep03(2025)139
Publication Date:
2025-03-23T03:20:32Z
AUTHORS (1141)
ABSTRACT
A bstract measurement of the CP -violating parameters in $$ {B}_s^0\boldsymbol{\to}{D}_s^{\mp }{K}^{\pm} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>→</mml:mo> <mml:mi>D</mml:mi> <mml:mo>∓</mml:mo> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> decays is reported, based on analysis proton-proton collision data collected by LHCb experiment corresponding to an integrated luminosity 6 fb − 1 at a centre-of-mass energy 13 TeV. The measured are obtained with decay-time dependent yielding C f = 0.791 ± 0.061 0.022, {A}_f^{\Delta \Gamma} <mml:mi>A</mml:mi> <mml:mi>f</mml:mi> <mml:mrow> <mml:mtext>∆</mml:mtext> <mml:mi>Γ</mml:mi> </mml:mrow> −0.051 0.134 0.058, {A}_{\overline{f}}^{\Delta <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> −0.303 0.125 0.055, S −0.571 0.084 0.023 and {S}_{\overline{f}} <mml:msub> <mml:mi>S</mml:mi> </mml:msub> −0.503 0.025, where first uncertainty statistical second systematic. This corresponds violation interference between mixing decay about 8.6 σ . Together value {B}_s^0 phase −2 β s , these used obtain CKM angle γ equal (74 12)° modulo 180°, contains both systematic contributions. result combined previous this channel using 3 resulting determination \gamma ={\left({81}_{-11}^{+12}\right)}^{\circ } <mml:mi>γ</mml:mi> <mml:mo>=</mml:mo> <mml:mfenced> <mml:mn>81</mml:mn> <mml:mo>−</mml:mo> <mml:mn>11</mml:mn> <mml:mo>+</mml:mo> <mml:mn>12</mml:mn> </mml:mfenced> <mml:mo>∘</mml:mo>
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