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Aubert, B.; Boutigny, D.; Gaillard, J.M.; Hicheur, A.; Karyotakis, Y.

doi:10.1103/physrevlett.87.241803

Cited by 101 publications

(162 citation statements)

References 7 publications

(6 reference statements)

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“…The presence of the exotic complex couplings together with PET may generate the non-vanishing T-even and T-odd angular correlations in the differential cross section. It is worth pointing out that the TRSV (equivalent CP violation in the case of CPT-invariant theory) is observed in the decays of neutral kaons and B-mesons [6][7][8], and described by a single phase of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix (CKM) [9]. However, this CP-violating phase does not allow for explanation of the existing matter-antimatter asymmetry of universe and new T-violating phases are needed [10].…”

Section: Introductionmentioning

confidence: 99%

On possibility of time reversal symmetry violation in neutrino elastic scattering on polarized electron target

Sobków

Błaut

2018

Eur. Phys. J. C

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In this paper, we indicate a possibility of utilizing the elastic scattering of the Dirac low energy (∼ 1 MeV) electron neutrinos (ν e 's) on the polarized electron target (PET) in testing the time reversal symmetry violation (TRSV). We consider a scenario in which the incoming ν e beam is the superposition of left chiral (LC) and right chiral (RC) states. LC ν e 's interact mainly by the standard V − A and small admixture of non-standard scalar S L , pseudoscalar P L , tensor T L interactions, while RC ones are only detected by the exotic V + A and S R , P R , T R interactions. In addition, one assumes that the spin polarization vector of the initial ν e 's is turned aside from its momentum, and due to this the nonvanishing transversal component of the ν e spin polarization appears. We compute the differential cross section as a function of the recoil electron azimuthal angle and scattered electron energy, and show how the interference terms between standard V − A and exotic S R , P R , T R couplings depend on the various angular correlations among the transversal ν e spin polarization, the polarization of the electron target, the incoming neutrino momentum and the outgoing electron momentum in the limit of relativistic ν e . We illustrate how the maximal value of recoil electrons azimuthal asymmetry and the asymmetry axis location of outgoing electrons depend on the azimuthal angle of the transversal component of the ν e spin polarization, both for the time reversal symmetry conservation (TRSC) and TRSV. Next, we display that the electron energy spectrum and polar angle distribution of the recoil electrons are also sensitive to the interference terms between V − A and S R , P R , T R couplings, proportional to the T-even and T-odd angular correlations among the transversal ν e polarization, the electron polarization of the target, and the incoming ν e momentum, respectively. Our modelindependent analysis is carried out for the flavor ν e 's. To a make such tests feasible, the intense (polarized) artificial ν e source, PET and the appropriate detector measuring the directionality of the outgoing electrons, and/or the recoil electrons energy with a high resolution have to be identified.

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Section: Introductionmentioning

confidence: 99%

On possibility of time reversal symmetry violation in neutrino elastic scattering on polarized electron target

Sobków

Błaut

2018

Eur. Phys. J. C

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“…DCPV in kaon decays is really small. This is in contrast with DCPV in B → Kπ decays, measured [217,218] at strength of 10% and only 5 years after ε /ε, and just 3 years after the measurement [20,21] of indirect CPV in B 0 → J/ψK S , which is order one. CPV, including DCPV, effects in B system are large.…”

Section: ε /εmentioning

confidence: 63%

“…These kaon modes, however, have long distance effects to disentangle, which demand a lot of studies. Figure 4: Obtained upper limits at 90% CL on the mixing parameter ε 2 versus the DP mass m A ′ , compared to other published exclusion limits from meson decay, beam dump and e + e − collider experiments [16][17][18][19][20][21][22]. Also shown is the band where the inconsistency of theoretical and experimental values of muon (g − 2) reduces to less than 2 standard deviations, as well as the region excluded by the electron (g − 2) measurement [2,23,24].…”

Section: K + → π + νν and Na62mentioning

confidence: 99%

“…The latter demanded the Z to be lighter than 400 MeV. 20 To couple to quarks, one introduces a vector-like quark U that carries U(1) charge, which mixes with normal u-type quarks. A weak boson loop then converts [208] the effective Z couplings of u-type quarks into sdZ and bsZ couplings (see Fig.…”

Section: K L → π 0 νν and Kotomentioning

confidence: 99%

“…2. But the main point is, less than 15 years after discovery of large B mixing, the world not only constructed two B factories, but Belle and BaBar both observed [20,21] the CPV phase of B 0 -B 0 mixing in 2001, 3 confirming the CKM paradigm, and the 2008 Nobel prize was awarded to Kobayashi and Maskawa (together with Nambu for spontaneous symmetry breaking, SSB). A CPV effect requires the interference between a CPV phase and a CP -conserving phase [22].…”

Section: Introductionmentioning

confidence: 99%

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Flavor physics and CP violation

Chang

Chen

Hou

2017

Progress in Particle and Nuclear Physics

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We currently live in the age of the CKM paradigm. The 3 × 3 matrix that links (d, s, b) quarks to (u, c, t) in the charged current weak interaction, being complex and nominally with 18 parameters, can be accounted for by just 3 rotation angles and one CP violating (CPV) phase, with unitarity and the CKM phases triumphantly tested at the B factories. But the CKM picture is unsatisfactory and has too many parameters. The main aim of Flavor Physics and CP violation (FPCP) studies is the pursuit to uncover New Physics beyond the Standard Model (SM). Two highlights of LHC Run 1 period are the CPV phase φ s of B s mixing and B s → µ + µ − decay, which were found to be again consistent with SM, though the saga is yet unfinished. We also saw the emergence of the P 5 angular variable anomaly in B 0 → K * 0 µ + µ − decay and R K ( * ) anomaly in B → K ( * ) µ + µ − to B → K ( * ) e + e − rate ratios, and the BaBar anomaly in B → D ( * ) τ ν decays, which suggest possible New Physics in these flavor processes, pointing to extra Z , charged Higgs, or leptoquarks. Charmless hadronic, semileptonic, purely leptonic and radiative B decays continue to offer various further windows on New Physics. Away from B physics, the rare K → πνν decays and ε /ε in the kaon sector, µ → e transitions, muon g − 2 and electric dipole moments of the neutron and electron, τ → µγ, µµµ, eee, and a few charm physics probes, offer broadband frontier windows on New Physics. Lastly, flavor changing neutral transitions involving the top quark t and the 125 GeV Higgs boson h, such as t → ch and h → µτ , offer a new window into FPCP, while a new Z related or inspired by the P 5 anomaly, could show up in analogous top quark processes, perhaps even link with low energy phenomena such as muon g − 2 or rare kaon processes. In particular, we advocate the potential new SM, the two Higgs doublet model without discrete symmetries to control flavor violation, as SM2. As we are close to the alignment limit with h rather SM-like, flavor changing neutral Higgs couplings (FCNH) are suppressed by a small mixing angle, but the exotic Higgs doublet possesses FCNH couplings, which we are just starting to probe. As LHC Run 2 runs its course, and with Belle II B physics program to start soon, there is much to look forward to in the flavor and CPV sector. *

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Time reversal violation from the entangled B 0 $ \overline B $ 0 system

Bernabéu

Martínez-Vidal

Villanueva-Pérez

2012

J. High Energ. Phys.

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Abstract:We discuss the concepts and methodology to implement an experiment probing directly Time Reversal (T ) non-invariance, without any experimental connection to CP violation, by the exchange of in and out states. The idea relies on the B 0 B 0 entanglement and decay time information available at B factories. The flavor or CP tag of the state of the still living neutral meson by the first decay of its orthogonal partner overcomes the problem of irreversibility for unstable systems, which prevents direct tests of T with incoherent particle states. T violation in the time evolution between the two decays means experimentally a difference between the intensities for the time-ordered (ℓ + X, J/ψK S ) and (J/ψK L , ℓ − X) decays, and three other independent asymmetries. The proposed strategy has been applied to simulated data samples of similar size and features to those currently available, from which we estimate the significance of the expected discovery to reach many standard deviations.

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Search for the DecayB0→γγ

Cited by 101 publications

References 7 publications

On possibility of time reversal symmetry violation in neutrino elastic scattering on polarized electron target

On possibility of time reversal symmetry violation in neutrino elastic scattering on polarized electron target

Flavor physics and CP violation

Time reversal violation from the entangled B 0 $ \overline B $ 0 system

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