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Search for time-dependent $CP$ violation in $D^0 \to K^+ K^-$ and $D^0 \to \pi^+ \pi^-$ decays

A search for time-dependent violation of the charge-parity symmetry in <math display="inline"><msup><mi>D</mi><mn>0</mn></msup><mo stretchy="false">→</mo><mrow><msup><mi>K</mi><mo>+</mo><...

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Kristian Alexander, Zavertyaev, Mikhail, Zdybal, Milosz, Zenaiev, Oleksandr, Zeng, Ming, Zhang, Dongliang, Zhang, Liming, Zhang, Shunan, Zhang, Yanxi, Zhang, Yu, Zhelezov, Alexey, Zheng, Yangheng, Zhou, Xiaokang, Zhou, Yixiong, Zhu, Xianglei, Zhukov, Valery, Zonneveld, Jennifer Brigitta, Zucchelli, Stefano, Zuliani, Davide, Zunica, Gianluca
Lenguaje:eng
Publicado: 2021
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.104.072010
http://cds.cern.ch/record/2767301
Descripción
Sumario:A search for time-dependent violation of the charge-parity symmetry in <math display="inline"><msup><mi>D</mi><mn>0</mn></msup><mo stretchy="false">→</mo><mrow><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>-</mo></msup></mrow></math> and <math display="inline"><msup><mi>D</mi><mn>0</mn></msup><mo stretchy="false">→</mo><mrow><msup><mi>π</mi><mo>+</mo></msup><msup><mi>π</mi><mo>-</mo></msup></mrow></math> decays is performed at the LHCb experiment using proton-proton collision data recorded from 2015 to 2018 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of <math display="inline"><mn>6</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. The <math display="inline"><msup><mi>D</mi><mn>0</mn></msup></math> meson is required to originate from a <math display="inline"><mrow><msup><mi>D</mi><mo>*</mo></msup><mo stretchy="false">(</mo><mn>2010</mn><msup><mo stretchy="false">)</mo><mo>+</mo></msup></mrow><mo stretchy="false">→</mo><mrow><msup><mi>D</mi><mn>0</mn></msup><msup><mi>π</mi><mo>+</mo></msup></mrow></math> decay, such that its flavor at production is identified by the charge of the accompanying pion. The slope of the time-dependent asymmetry of the decay rates of <math display="inline"><msup><mi>D</mi><mn>0</mn></msup></math> and <math display="inline"><mrow><msup><mrow><mover accent="true"><mrow><mi>D</mi></mrow><mrow><mo stretchy="false">¯</mo></mrow></mover></mrow><mrow><mn>0</mn></mrow></msup></mrow></math> mesons into the final states under consideration is measured to be <math display="inline"><mrow><mi mathvariant="normal">Δ</mi><msub><mi>Y</mi><mrow><msup><mi>K</mi><mo>+</mo></msup><msup><mi>K</mi><mo>-</mo></msup></mrow></msub></mrow><mo>=</mo><mo stretchy="false">(</mo><mo>-</mo><mn>2.3</mn><mo>±</mo><mn>1.5</mn><mo>±</mo><mn>0.3</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>4</mn></mrow></msup></math>, <math display="inline"><mrow><mi mathvariant="normal">Δ</mi><msub><mi>Y</mi><mrow><msup><mi>π</mi><mo>+</mo></msup><msup><mi>π</mi><mo>-</mo></msup></mrow></msub></mrow><mo>=</mo><mo stretchy="false">(</mo><mo>-</mo><mn>4.0</mn><mo>±</mo><mn>2.8</mn><mo>±</mo><mn>0.4</mn><mo stretchy="false">)</mo><mo>×</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>4</mn></mrow></msup></math>, where the first uncertainties are statistical and the second are systematic. These results are compatible with the conservation of the charge-parity symmetry at the level of 2 standard deviations and improve the precision by nearly a factor of 2.