The DEAR case

Bianco, S.; Bragadireanu, A. M.; Fabbri, F. L.; Guaraldo, C.; Iliescu, M.; Ito, T. M.; Lucherini, V.; Petrascu, C.; Bregant, M.; Milotti, E.; Vacchi, A.; Zavattini, E.; Augsburger, Marc; Chatellard, D.; Knowles, P.; Mulhauser, F.; Schaller, L. A.; Schellenberg, L.; Schneuwly, H.; Egger, J.‐P.; Varidel, D.; Breunlich, W. H.; Cargnelli, M.; Gartner, Barbara L.; King, R.; Lauss, B.; Márton, J.; Zmeskal, J.; Ponta, T.; Nakamura, S. N.; Koike, T.; Hayano, R. S.; Hori, Masaki; Ishikawa, Takashi; Ishiwatari, T.; Iwasaki, M.; Akaishi, Yoshinori; Beer, G.; Sanderson, A. C.; Seki, Ryoichi

doi:10.1007/bf02874596

Cited by 54 publications

(58 citation statements)

References 46 publications

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“…Both the short-range quark-level transitions and the long-range processes contribute to D 0 −D 0 oscillation. The short-range contributions proceed via loops where the virtual particles are mediated [54][55][56]. This causes the study of the D 0 −D 0 mixing more interesting as new physics models with new (FCNC) degrees of freedom could be examined through it.…”

Section: Theoretical Formalismmentioning

confidence: 99%

Same-sign top pair plus W production in flavor changing vector and scalar models

et al. 2018

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We investigate the prospect of the LHC for discovering new physics effects via new strategies in the same-sign top pair and same-sign top pair associated with a W boson signatures. Significant enhancement in production of same-sign top quarks (plus a W boson) is a joint property of several models beyond the standard model. We concentrate on the leptonic (electron and muon) decay of the top quarks and study the exclusion reach of the LHC data for a simplified model approach where top quark flavor changing could occur through a Z or a neutral scalar φ exchange. Less background contributions and clean signature are the advantages of the leptonic decay mode of the top quarks in the same-sign production processes. A combination is performed on both same-sign top pair and same-sign top pair plus a W boson production modes which enables us to reach a large fraction of the model parameter space. Assuming the couplings of new physics of the order of 10 −2 , the mass of a flavor changing Z or a neutral scalar above 1 TeV could be excluded. We propose a momentum dependent charge asymmetry and angular observables in the same-sign top process which provide the possibility of separation of new physics signal from the SM backgrounds as well as discrimination of the flavor changing tuX from tcX, where X = Z , φ.

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Section: Theoretical Formalismmentioning

confidence: 99%

Same-sign top pair plus W production in flavor changing vector and scalar models

et al. 2018

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“…The significance of the ∆a CP deviation from zero is 5.3 standard deviations, making this the first observation of CP V in the charm-quark sector. The measured ∆A CP value is at the high end of theoretical estimates for its SM value, which range from 10 −4 [187] to 10 −3 [188][189][190][191]. The LHCb result is intriguing, because it may be a sign of the long-sought-for non-SM mechanism for CP V .…”

Section: B Study Of States Close To the Pp Mass Thresholdmentioning

confidence: 96%

The BESIII physics programme

Yuan

Olsen

2019

Nat Rev Phys

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The standard model of particle physics is a well-tested theoretical framework, but there are still a number of issues that deserve further experimental and theoretical investigation. For quark physics, such questions include: the nature of quark confinement, the mechanism that connects the quarks and gluons of the standard model theory to the strongly interacting particles; and the weak decays of quarks, which may provide insights into new physics mechanisms responsible for the matter-antimatter asymmetry of the Universe. These issues are addressed by the Beijing Spectrometer III (BESIII) experiment at the Beijing Electron-Positron Collider II (BEPCII) storage ring, which for the past decade has been studying particles produced in electron-positron collisions in the tau-charm energy-threshold region, and has by now accumulated the world's largest datasets that enables searches for nonstandard hadrons, weak decays of the charmed particles, and new physics phenomena beyond the standard model. Here, we review the contributions of BESIII to such studies and discuss future prospects for BESIII and other experiments.

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“…A int CP (t) has been missed in the literature of studying D meson decays [31,34,[46][47][48] in which the DCS amplitudes are assumed to be zero, and was first pointed out in [49] as a new CP -violation effect. It arises from the mother decay and the daughter mixing.…”

Section: Cp Asymmetrymentioning

confidence: 99%

“…CP violation in charmed baryon decays has not been observed up to now. In some literatures, the CP violation in charm decays into neutral kaons have be studied [31,34,[44][45][46][47][48]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

K0 S − K0 L asymmetries and CP violation in charmed baryon decays into neutral kaons

Wang¹,

Guo²,

Long³

et al. 2018

J. High Energ. Phys.

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We study the K 0 S −K 0 L asymmetries and CP violations in charm-baryon decays with neutral kaons in the final state. The K 0 S − K 0 L asymmetry can be used to search for two-body doubly Cabibbo-suppressed amplitudes of charm-baryon decays, with the one in Λ + c → pK 0 S,L as a promising observable. Besides, it is studied for a new CP -violation effect in these processes, induced by the interference between the Cabibbo-favored and doubly Cabibbo-suppressed amplitudes with the neutral kaon mixing. Once the new CP-violation effect is determined by experiments, the direct CP asymmetry in neutral kaon modes can then be extracted and used to search for new physics. The numerical results based on SU(3) symmetry will be tested by the experiments in the future.

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The DEAR case

Cited by 54 publications

References 46 publications

Same-sign top pair plus W production in flavor changing vector and scalar models

Same-sign top pair plus W production in flavor changing vector and scalar models

The BESIII physics programme

K0 S − K0 L asymmetries and CP violation in charmed baryon decays into neutral kaons

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