First Evidence for Mixing-Induced; <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline">; <mml:mi>C</mml:mi>; <mml:mi>P</mml:mi>; </mml:math>; Violation in; <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline">; <mml:msubsup>; <mml:mi>B</mml:mi>; <mml:mi>s</mml:mi>; <mml:mn>0</mml:mn>; </mml:msubsup>; <mml:mo stretchy="false">→</mml:mo>; <mml:mi>J</mml:mi>; <mml:mo>/</mml:mo>; <mml:mi>ψ</mml:mi>; <mml:mi>ϕ</mml:mi>; <mml:mo stretchy="false">(</mml:mo>; <mml:mn>1020</mml:mn>; <mml:mo stretchy="false">)</mml:mo>; </mml:math>; Decays in; <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline">; <mml:mi>p</mml:mi>; <mml:mi>p</mml:mi>; </mml:math>; Collisions at; <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline">; <mml:mrow>; <mml:msqrt>; <mml:mrow>; <mml:mi>s</mml:mi>; </mml:mrow>; </mml:msqrt>; <mml:mo>=</mml:mo>; <mml:mn>13</mml:mn>; <mml:mtext> </mml:mtext>; <mml:mtext> </mml:mtext>; <mml:mi>TeV</mml:mi>; </mml:mrow>; </mml:math> | CU Experts

; A novel machine-learning-based flavor-tagging algorithm combining same-side and opposite-side tagging is used to obtain the equivalent of 27 500 tagged; ; ; B; s; 0; ; →; J; /; ψ; ϕ; (; 1020; ); ; decays from; ; p; p; ; collisions at; ; ; s; ; =; 13; ; ; TeV; ; , collected by the CMS experiment and corresponding to an integrated luminosity of; ; 96.5; ; ; ; fb; ; −; 1; ; ; ; . A time- and flavor-dependent angular analysis of the; ; ; ; ; ; μ; ; ; +; ; ; ; ; μ; ; ; −; ; ; ; ; ; ; K; ; ; +; ; ; ; ; K; ; ; −; ; ; ; ; ; final state, consistent with a; ; ; ; ϕ; (; 1020; ); ; →; ; ; ; K; ; ; +; ; ; ; ; K; ; ; −; ; ; ; ; ; decay, is used to measure parameters of the; ; ; B; s; 0; ; −; ; ; B; ¯; ; s; 0; ; ; system. The weak phase is measured to be; ; ; ; ; ϕ; ; ; s; ; ; =; ; −; 73; ; ±; 22; ; (; stat; ); ; ±; 10; ; (; syst; ); ; ; ; mrad; ; ; , which, combined with the; ; ; ; ; s; ; ; =; 8; ; ; TeV; ; ; CMS result, gives; ; ; ; ; ϕ; ; ; s; ; ; =; ; −; 75; ; ±; 23; ; ; mrad; ; ; . This value differs from zero by 3.2 standard deviations, providing the first evidence for mixing-induced; ; C; P; ; violation in; ; ; B; s; 0; ; →; J; /; ψ; ϕ; (; 1020; ); ; decays. All measured physics parameters are found to agree with standard model predictions where available.;

Hayrapetyan A; Tumasyan A; Adam W; Andrejkovic JW; Benato L; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Hussain PS

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