Studies of lepton flavor violation at the LHC

Bhattacharya, Bhubanjyoti; Morgan, R.; Osborne, James; Petrov, Alexey A.

doi:10.1016/j.physletb.2018.08.037

Cited by 11 publications

(10 citation statements)

References 56 publications

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“…The importance of combining low-energy data and high-p T LHC data to constrain flavor-changing interactions has been already pointed out for the three light quarks [39][40][41], the bottom quark [42][43][44][45][46] and lepton-flavor violating interactions [47][48][49][50], while there has not been a study devoted to the reach of this program in the charm sector.…”

Section: Jhep11(2020)080mentioning

confidence: 99%

Charm physics confronts high-pT lepton tails

Fuentes-Martín

Greljo

Camalich

et al. 2020

J. High Energ. Phys.

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We present a systematic survey of possible short-distance new-physics effects in (semi)leptonic charged- and neutral-current charmed meson decays. Using the Standard Model Effective Field Theory (SMEFT) to analyze the most relevant experimental data at low and high energies, we demonstrate a striking complementarity between charm decays and high invariant mass lepton tails at the LHC. Interestingly enough, high-pT Drell-Yan data offer competitive constraints on most new physics scenarios. Furthermore, the full set of correlated constraints from K, π and τ decays imposed by SU(2)L gauge invariance is considered. The bounds from D(s) decays, high-pT lepton tails and SU(2)L relations chart the space of the SMEFT affecting semi(leptonic) charm flavor transitions.

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Section: Jhep11(2020)080mentioning

confidence: 99%

Charm physics confronts high-pT lepton tails

Fuentes-Martín

Greljo

Camalich

et al. 2020

J. High Energ. Phys.

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“…The hadronic cross-section is then given by the expression where q denotes both down and up-type quarks. The summation extends over all quark flavors, with the exception of the top quark which only contributes at one-loop to this process [ 38 , 39 ]. Notice that if the partonic cross-section is a linear function in , as it is our case, then the only dependence on of the integrand in Eq.…”

Section: Lfv Tails At the Lhcmentioning

confidence: 99%

Lepton flavor violation and dilepton tails at the LHC

2020

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Starting from a general effective Lagrangian for lepton flavor violation (LFV) in quark-lepton transitions, we derive constraints on the effective coefficients from the high-mass tails of the dilepton processes $$pp \rightarrow \ell _k \ell _l$$ p p → ℓ k ℓ l (with $$k\ne l$$ k ≠ l ). The current (projected) limits derived in this paper from LHC data with $$36~\mathrm {fb}^{-1}$$ 36 fb - 1 ($$3~\mathrm {ab}^{-1}$$ 3 ab - 1 ) can be applied to generic new physics scenarios, including the ones with scalar, vector and tensor effective operators. For purely left-handed operators, we explicitly compare these LHC constraints with the ones derived from flavor-physics observables, illustrating the complementarity of these different probes. While flavor physics is typically more constraining for quark-flavor violating operators, we find that LHC provides the most stringent limits on several flavor-conserving ones. Furthermore, we show that dilepton tails offer the best probes for charm-quark transitions at current luminosities and that they provide competitive limits for tauonic $$b\rightarrow d$$ b → d transitions at the high-luminosity LHC phase. As a by-product, we also provide general numerical expressions for several low-energy LFV processes, such as the semi-leptonic decays $$K\rightarrow \pi \ell ^{\pm }_k \ell ^{{\mp }}_l$$ K → π ℓ k ± ℓ l ∓ , $$B\rightarrow \pi \ell ^{\pm }_k \ell ^{{\mp }}_l$$ B → π ℓ k ± ℓ l ∓ and $$B\rightarrow K^{(*)} \ell ^{\pm }_k \ell ^{{\mp }}_l$$ B → K ( ∗ ) ℓ k ± ℓ l ∓ .

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“…where the summation extends over all quark flavors, with the exception of the top quark which only contributes at one-loop to this process [18]. Note that if the partonic cross-sectionσ is a linear function in τ, as it is our case, then the only dependence on τ of the integrand in Eq.…”

Section: Eft Descriptionmentioning

confidence: 87%

Lepton Flavor Violation and Dilepton Tails at the LHC

Sumensari¹

2021

Proceedings of 40th International Conference on High Energy Physics — PoS(ICHEP2020)

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Charged Lepton Flavor Violation (LFV) is a very clean probe of New Physics since it is forbidden in the Standard Model (SM). The observation of neutrino oscillation implies nonzero LFV rates, which however are highly suppressed by the smallness of neutrino masses. This makes LFV an appealing target of experimental searches, as its observation would unambiguously point to New Physics. In this proceedings, we will discuss the constraints on LFV effective operators that can be derived from LHC data on dilepton production. We will show that semileptonic operators can be constrained by existing searches of pp → i j (with i j) at high-p T. We will explore the complementarity of these constraints with the ones obtained from low-energy observables, by showing, in particular, that LHC data provides the best constraints for several quark-flavor conserving effective coefficients, as well as for the ones that are relevant for charm physics.

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Studies of lepton flavor violation at the LHC

Cited by 11 publications

References 56 publications

Charm physics confronts high-pT lepton tails

Charm physics confronts high-pT lepton tails

Lepton flavor violation and dilepton tails at the LHC

Lepton Flavor Violation and Dilepton Tails at the LHC

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