Feasibility of τ -lepton electromagnetic dipole moments measurement using bent crystal at the LHC

Fomin, A. S.; Korchin, A. Yu.; Stocchi, A.; Barsuk, S.; Robbe, P.

doi:10.1007/jhep03(2019)156

Cited by 27 publications

(26 citation statements)

References 39 publications

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“…As a result, for ϕ xx ≃ 10 18 V cm 2 we have Ω Q ≃ 10 6 s − 1. Hence distance passed by particle in crystal L = 10cm rotation angle is ϑ ≃ 10 −3 rad, that corresponds to experiments for EDM limitations of heavy baryons [1][2][3][4]. Let us note, that in experiments in a straight crystal spin rotation caused by the magnetic moment of Ω ± hyperon is suppressed.…”

Section: Relativistic Particles Spin Interactions With Crystalsmentioning

confidence: 82%

“…Violation of parity (P) and time reversal (T) symmetries lead to appearance of numerous processes allowing investigation of physics Beyond the Standard Model. Recently, the experimental approach was proposed [1][2][3][4] to search for the electromagnetic dipole moments (EDM) of charged short-lived heavy baryons and τ -leptons using bent crystals at LHC. According to [5][6][7] the same approach gives unique possibility for investigation of P-odd T-even and P-odd T-odd (CP-odd) interactions of short lived baryons (τ -leptons) with electrons and nuclei.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic dipole moment and time reversal invariance violating interactions of high energy short-lived particles in bent and straight crystals

Baryshevsky

2019

Phys. Rev. Accel. Beams

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A particle, which moves in a crystal, experiences weak interactions with electrons and nuclei alongside with electromagnetic interaction. Measuring the polarization vector and the angular distribution of charged and neutral particles scattered by axes (planes) of an unbent (straight) crystal enables to obtain restrictions for the EDM value and for magnitudes of constants describing Todd (CP-odd) interactions Beyond the Standard Model. Spin rotation and polarization conversion from vector to tensor one and vice versa for a channelled in a crystal Ω ± hyperon enable measuring hyperon's quadrupole moment that is not possible to measure by use of laboratory available noncrystalline electric fields.

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Section: Relativistic Particles Spin Interactions With Crystalsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Electromagnetic dipole moment and time reversal invariance violating interactions of high energy short-lived particles in bent and straight crystals

Baryshevsky

2019

Phys. Rev. Accel. Beams

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“…While at the moment a τ is not very sensitive to BSM physics, the limit in eq. (1.6) will be improved at Belle-II and at the Large Hadron Collider (LHC) [37][38][39][40].…”

Section: Jhep08(2021)103mentioning

confidence: 99%

Leptonic anomalous magnetic moments in ν SMEFT

Cirigliano

Dekens

Vries

et al. 2021

J. High Energ. Phys.

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We investigate contributions to the anomalous magnetic moments of charged leptons in the neutrino-extended Standard Model Effective Field Theory (νSMEFT). We discuss how νSMEFT operators can contribute to a lepton’s magnetic moment at one- and two-loop order. We show that only one operator can account for existing electronic and muonic discrepancies, assuming new physics appears above 1 TeV. In particular, we find that a right-handed charged current in combination with minimal sterile-active mixing can explain the discrepancy for sterile neutrino masses of $$ \mathcal{O} $$ O (100) GeV while avoiding direct and indirect constraints. We discuss how searches for sterile neutrino production at the (HL-)LHC, measurements of h→μ+μ− and searches for h→e+e−, neutrinoless double beta decay experiments, and improved unitarity tests of the CKM matrix can further probe the relevant parameter space.

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“…There have been several proposals to measure the tau anomalous magnetic moment and to utilize it as a probe for new physics at the LHC using various channels [20][21][22][23][24][25][26][27][28][29]. In the future, colliders such as the International Linear Collider (ILC) [30][31][32] will have more center-of-mass energies, higher luminosity, and the ability to control the polarization of the beam.…”

Section: Introductionmentioning

confidence: 99%

Tau $$g{-}2$$ at $$e^-e^+$$ colliders with momentum-dependent form factor

Tran

Kurihara

2021

Eur. Phys. J. C

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The deviation between the prediction based on the standard model and the measurement of the muon $$g{-}2$$ g - 2 is currently at $$3{-}4 \sigma $$ 3 - 4 σ . If this discrepancy is attributable to new physics, it is expected that the new contributions to the tau $$g{-}2$$ g - 2 even larger than those of muon due to its large mass. However, it is much more difficult to directly measure the tau $$g{-}2$$ g - 2 because of its short lifetime. In this report, we consider the effect of the tau $$g{-}2$$ g - 2 at $$e^-e^+$$ e - e + colliders using a model independent approach. Using the tau pair production channel at the Large Electron Position Collider (LEP), we have determined the allowed range for the new physics contribution of the tau $$g{-}2$$ g - 2 assuming a q-square-dependence ansatz for the magnetic form factor. We also investigated the prospect at future $$e^+e^-$$ e + e - colliders, such as International Linear Collider, the Compact Linear Collider, the Future Circular $$e^+e^-$$ e + e - Collider, and Circular Electron Positron Collider, and determined the expected allowed range for the new physics contribution to the tau anomalous magnetic moment. The best limits are about $$4{-}5$$ 4 - 5 times more severe than the LEP one due to the beam polarization and the high luminosities at future colliders.

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Feasibility of τ -lepton electromagnetic dipole moments measurement using bent crystal at the LHC

Cited by 27 publications

References 39 publications

Electromagnetic dipole moment and time reversal invariance violating interactions of high energy short-lived particles in bent and straight crystals

Electromagnetic dipole moment and time reversal invariance violating interactions of high energy short-lived particles in bent and straight crystals

Leptonic anomalous magnetic moments in ν SMEFT

Tau $$g{-}2$$ at $$e^-e^+$$ colliders with momentum-dependent form factor

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