Searching for leptoquarks at future muon colliders

Asadi, Pouya; Capdevilla, Rodolfo; Cesarotti, Cari; Homiller, Samuel

doi:10.1007/jhep10(2021)182

Cited by 57 publications

(35 citation statements)

References 130 publications

(164 reference statements)

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“…These advantages of muon collider and recent muon anomalies, in addition to the assumption that LQs do not couple to electrons, drive us to perform the LQs study at a muon collider. There are already some interesting results of LQs searches at muon collider [47][48][49], our study will be supplement to them and make it clear that the muon collider is able to answer the question of B meson rare decay anomaly. It is a well-known fact that the challenge of a muon collider is to provide high luminosity and high phase-space density muon beams due to the short life time and the source of muons (produced from π-decay) [50,51].…”

Section: Introductionmentioning

confidence: 79%

“…In ref. [48] the authors discuss same flavour dijet state in detail however mainly focusing on b + b flavour. As the B meson rare decay anomaly requires non-zero product between the quark-LQ-muon coupling constants of b and s flavour, specialized flavour assumptions are needed to translate di-bjet limits to di-light jet limit in that case.…”

Section: Same Flavour Final Statementioning

confidence: 99%

“…Similar leptoquark involved processes with 2 jet + 2 charged lepton in the final state at muon collider is also discussed in refs. [48,49]. However, they mainly focus on the final states with two same flavour muons (taus) and two b jets, which has interference with SM processes.…”

Section: Di-jet+di-lepton Final State: Di-bjet + µ + τ As An Examplementioning

confidence: 99%

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Searching for heavy leptoquarks at a muon collider

Qian

et al. 2021

J. High Energ. Phys.

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The LHCb Collaboration recently gave an update on testing lepton flavour universality with B+→ K+ℓ+ℓ−, in which a 3.1 standard deviations from the standard model prediction was observed. The g-2 experiment also reports a 3.3 standard deviations from the standard model on muon anomalous magnetic moment measurement. These deviations could be explained by introducing new particles including leptoquarks. In this paper, we show the possibility to search for heavy spin-1 leptoquarks at a future TeV scale muon collider by performing studies from three channels: 1) same flavour final states with either two bottom or two light quarks, 2) different flavour quark final states, and 3) a so-called “VXS” process representing the scattering between a vector boson and a leptoquark to probe the coupling between leptoquark and tau lepton. We conclude that a 3 TeV muon collider with 3 ab−1 of integrated luminosity is already sufficient to cover the leptoquark parameter space in order to explain the LHCb lepton flavour universality anomaly.

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Section: Introductionmentioning

confidence: 79%

Section: Same Flavour Final Statementioning

confidence: 99%

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Searching for heavy leptoquarks at a muon collider

Qian

et al. 2021

J. High Energ. Phys.

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“…The need for employing H and H as external states does not pose any additional difficulty (relative to the di-fermion processes) in the evaluation of exclusive cross-sections. That is because the double logs are mere multiplicative factors in front of the Born-level density matrix (23). Therefore the exclusive cross-sections still take the form of eq.…”

Section: Longitudinal Di-bosonmentioning

confidence: 99%

Learning from Radiation at a Very High Energy Lepton Collider

Chen,

Glioti,

Rattazzi

et al. 2022

Preprint

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We study the potential of lepton collisions with about 10 TeV center of mass energy to probe Electroweak, Higgs and Top short-distance physics at the 100 TeV scale, pointing out the interplay with the long-distance (100 GeV) phenomenon of Electroweak radiation. On one hand, we find that sufficiently accurate theoretical predictions require the resummed inclusion of radiation effects, which we perform at the double logarithmic order. On the other hand, we notice that short-distance physics does influence the emission of Electroweak radiation. Therefore the investigation of the radiation pattern can enhance the sensitivity to new short-distance physical laws. We illustrate these aspects by studying Effective Field Theory contact interactions in di-fermion and di-boson production, and comparing cross-section measurements that require or that exclude the emission of massive Electroweak bosons. The combination of the two types of measurements is found to enhance the sensitivity to the new interactions. Based on these results, we perform sensitivity projections to Higgs and Top Compositeness and to minimal Z new physics scenarios at future muon colliders.

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“…The new physics scale required to address the anomaly in R D ( ) is as low as a few TeV, and therefore any underlying BSM particle(s) responsible for the (potentially) new physics may be within the expected mass reach of the LHC or, eventually, future high(er)-energy colliders -see e.g. [51][52][53][54]. Numerous studies of the LHC phenomenology of LQs responsible for the R D ( ) anomaly exist, ranging from resonant LQ pair-and single-production, t-channel LQ exchange, and other non-resonant processes, see e.g.…”

Section: Introductionmentioning

confidence: 99%

LHC Signatures of $τ$-Flavoured Vector Leptoquarks

Bernigaud,

Blanke,

Varzielas

et al. 2021

Preprint

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We consider the phenomenological signatures of Simplified Models of Flavourful Leptoquarks, whose Beyond-the-Standard Model (SM) couplings to fermion generations occur via textures that are well motivated from a broad class of ultraviolet flavour models (which we briefly review). We place particular emphasis on the study of the vector leptoquark ∆ µ with assignments (3, 1, 2/3) under the SM's gauge symmetry, SU (3) C × SU (2) L × U (1) Y , which has the tantalising possibility of explaining both R K ( ) and R D ( ) anomalies. Upon performing global likelihood scans of the leptoquark's coupling parameter space, focusing in particular on models with tree-level couplings to a single charged lepton species, we then provide confidence intervals and benchmark points preferred by low(er)-energy flavour data. Finally, we use these constraints to further evaluate the (promising) Large Hadron Collider (LHC) detection prospects of pairs of τ -flavoured ∆ µ , through their distinct (a)symmetric decay channels. Namely, we consider direct third-generation leptoquark and jets plus missing-energy searches at the LHC, which we find to be complementary. Depending on the simplified model under consideration, the direct searches constrain the ∆ µ mass up to 1400-1750 GeV when the branching fraction of ∆ µ is entirely to third-generation quarks (but are significantly reduced with decreased branching ratios to the third generation), whereas the missingenergy searches constrain the mass up to 1150-1500 GeV while being largely insensitive to the third-generation branching fraction.

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Searching for leptoquarks at future muon colliders

Cited by 57 publications

References 130 publications

Searching for heavy leptoquarks at a muon collider

Searching for heavy leptoquarks at a muon collider

Learning from Radiation at a Very High Energy Lepton Collider

LHC Signatures of $τ$-Flavoured Vector Leptoquarks

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