Observation of 
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 Violation in Charm Decays

“…During the past three decades, the two-body charmless hadronic B s → P P decays ( P refers to the light pseudoscalar mesons π, K, η (′) ) have been studied intensively by many authors for example in Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13] and measured by CDF, Belle and LHCb Collaborations [14][15][16][17][18][19][20][21][22][23][24][25][26]. The studies for these decays can offer us good opportunities to test the Standard Model (SM) and to search for the new physics (NP) beyond the SM.…”

Section: Introductionmentioning

confidence: 99%

“…Among the thirteen B 0 s → P P decays, only five of them have been observed by CDF [16][17][18][19], Belle [14,15] and LHCb Collaboration [20][21][22][23][24][25][26]. The measured values of the branching ratios and/or the CP-violating asymmetries are collected in Tables I and II .…”

Section: Introductionmentioning

confidence: 99%

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Anatomy of B → PP decays and effects of the next-to-leading order contributions in the perturbative QCD approach

2019

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By employing the perturbative QCD (PQCD) factorization approach, we made a systematic investigation for the CP-averaged branching ratios and the CP-violating asymmetries of the thirteenB 0 s → P P decays ( here P = (π, K, η, η ′ )) with the inclusion of all currently known next-to-leading order (NLO) contributions, and compared our results with the measured values or the theoretical predictions from other different approaches. We focused on the examination of the effects of the NLO contributions and found the following points:decays, the NLO contributions can provide a (40 − 150)% enhancement or a 20% reduction to the corresponding leading order (LO) PQCD predictions for their decay rates and result in a much better agreement between the PQCD predictions and the experimental measurements; (b) for the pure annihilation decaȳ B 0 s → π + π − , the PQCD prediction still remain consistent with the data after the inclusion of the small NLO reduction; (c) the PQCD predictions for the ratiobecome agree very well with the measured ones after the inclusion of a 40% NLO reduction; (d) for B 0 s → K + K − andB 0 s → π − K + decays, the NLO PQCD predictions for their CP-violating asymmetries do agree very well with the measured values in both the sign and the magnitude; and (e) for allB 0 s → P P decays, we also compared our results with those obtained in the QCD factorization approach and soft-collinear effective theory and discussed their similarities and differences.

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“…discovered with a lot of efforts during the past decade. The LHCb collaboration eventually observed the charm CP V in 2019 via measuring the difference of CP asymmetries of D 0 → K + K − and D 0 → π + π − with the result of (1.54 ± 0.29) × 10 −3 [1], with the significance of 5.3σ. After the establishment of CP V in the strangeand bottom-quark systems, the observation of charm CP V is a milestone of particle physics.…”

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confidence: 99%

Charm CPV: observation and prospects

Saur

2020

Science Bulletin

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IntroductionIn physics, the symmetries and their violation always provide deep insights into the Nature. The parity (P ) symmetry represents the system is unchanged under the space reflection. The violation of parity, firstly proposed by Lee and Yang and subsequently discovered in 1956, plays the key role in the understanding of the weak interaction which is one of the four basic forces of nature. The charge (C) symmetry describes a property between particles and their anti-particles. The violation of the combined charge-parity (CP ) symmetry was unexpectedly observed in kaon meson decays in 1964. The C and CP violation (CP V ) are required to explore why there are much more matter than anti-matter in the Universe.The explanation of CP V was proposed by Kobayashi and Maskawa (KM) in 1973 by introducing three generations of quarks, or say six quarks, whereas only three quarks were established at the time. All the six quarks were found in the following twenty years. This theory was finally manifested by the observation of CP V in the bottom-quark meson system in 2001. The measured amount of CP V in the Standard Model (SM) of particle physics is about ten orders of magnitude smaller than required by the matter-antimatter asymmetry in the Universe. Therefore, it is important to search for new sources of CP V beyond the SM (BSM). The KM mechanism also predicts the existence of CP V in the charm-quark system which, however, had never been

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Observation of CP Violation in Charm Decays

Cited by 219 publications

References 65 publications

Implications of the LHCb discovery of CP violation in charm decays

Implications of the LHCb discovery of CP violation in charm decays

Anatomy of B → PP decays and effects of the next-to-leading order contributions in the perturbative QCD approach

Charm CPV: observation and prospects

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Observation of CP Violation in Charm Decays

Cited by 219 publications

References 65 publications

Implications of the LHCb discovery of CP violation in charm decays

Implications of the LHCb discovery of CP violation in charm decays

Anatomy of B → PP decays and effects of the next-to-leading order contributions in the perturbative QCD approach

Charm CPV: observation and prospects

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Anatomy of B → PP decays and effects of the next-to-leading order contributions in the perturbative QCD approach