Phenomenological determination of electroproduction structure functions

Faroughy, Dara; Shaw, Gordon L.

doi:10.1103/physrevd.19.1992

Cited by 11 publications

(18 citation statements)

References 25 publications

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“…There are several proposals with scalar leptoquarks that address R K ( * ) and/or R D ( * ) [559,[561][562][563][564][565][566], some in the context of unified theories such as SU (5) Finally, moderately large leptoquark couplings dictated by the above LFU anomalies can be also observed in processes with virtual LQ exchange, typically in the t-channel, resulting in a final state with at least one charged lepton. Inspired by the abovementioned LFU anomalies, processes with final state leptons have been studied, which can probe LQ scenarios for LFU violation observed in B meson decays [585][586][587][588]. In this case, LQ Figure 16: Diagrams contributing to LFV processes, l − α → l − β γ (left) and l − α → l − β l − γ l + δ (centre and right) with X and X scalar or vector mediators and f and f fermions.…”

Section: Lepton Flavour Universalitymentioning

confidence: 99%

GUT Physics in the Era of the LHC

et al. 2019

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Grand Unified Theories (GUTs) are one of the most interesting high-energy completions of the Standard Model, because they provide a rich, powerful and elegant group-theoretical framework able to resolve a variety of problems remaining in our current understanding of particle physics. They usually act as motivators for many low energy BSM theories, such as left-right symmetric or supersymmetric models, and they serve to fill the gap between the experimentally reachable low energies and the physics in the ultraviolet. In recent years, however, they have fallen slightly from the spotlight, in favour of "simplified" models with more specific phenomenological predictions. The aim of this review is to summarize the state of the art on GUTs and argue for their importance in modern physics. Recent advances in experiments permit to test the predictions of GUTs at different energy scales. First, as GUTs can play a role in the inflationary dynamics of the early Universe, their imprints could be found in the CMB observations by the Planck satellite. Remarkably enough, GUTs could manifest themselves also in terrestrial tests; several planned experiments aim to probe the proton stability and to establish order of magnitude higher bounds on its lifetime. Moreover, the predictions of specific GUT models could be tested even at the LHC thanks to its high energy reach, via searches for exotic states or additional contributions to flavour anomalies.

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Section: Lepton Flavour Universalitymentioning

confidence: 99%

GUT Physics in the Era of the LHC

et al. 2019

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“…This corresponds to a parton level cross-section of ∼ 16 fb for p j T > 250 GeV, which we use as an upper limit on the monojet cross-section to set the limits on the vector LQ mass and couplings. For the bb → τ τ process, we impose the bound obtained in [97] and rescale it with the √ L factor in order to get the estimate for the projected sensitivity.…”

Section: Off-shell Exchangementioning

confidence: 99%

“…The limits on the cc → τ τ process can be obtained from the ones computed in [97] for bb → τ τ case (shown in the bottom panel of Fig. 6 of [97]) by taking into account the different parton luminosities for the two different initial state quarks.…”

Section: Off-shell Exchangementioning

confidence: 99%

Combined explanations of B-physics anomalies: the sterile neutrino solution

Azatov

Barducci

Ghosh

et al. 2018

J. High Energ. Phys.

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In this paper we provide a combined explanation of charged-and neutral-current B-physics anomalies assuming the presence of a light sterile neutrino N R which contributes to the B → D ( * ) τ ν processes. We focus in particular on two simplified models, where the mediator of the flavour anomalies is either a vector leptoquark U µ 1 ∼ (3, 1, 2/3) or a scalar leptoquark S 1 ∼ (3, 1, 1/3). We find that U µ 1 can successfully reproduce the required deviations from the Standard Model while being at the same time compatible with all other flavour and precision observables. The scalar leptoquark instead induces a tension between B s mixing and the neutral-current anomalies. For both states we present the limits and future projections from direct searches at the LHC finding that, while at present both models are perfectly allowed, all the parameter space will be tested with more luminosity. Finally, we study in detail the cosmological constraints on the sterile neutrino N R and the conditions under which it can be a candidate for dark matter.

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“…For collider processes the QCD corrections to production and decay of LQs are known for a long time [82][83][84] and have been improved to include NLO parton shower [85] or a large width [86]. Furthermore, in recent analyses correlating the B anomalies to LHC searches [52,[87][88][89][90][91] QCD corrections to production and/or decay were included. However, the anal- * Electronic address: jason.aebischer@tum.de † Electronic address: andreas.crivellin@cern.ch ‡ Electronic address: greub@itp.unibe.ch ogous α s corrections for LQ effects in the low energy observables (i.e.…”

Section: Introductionmentioning

confidence: 99%

QCD improved matching for semileptonic B decays with leptoquarks

2019

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Leptoquarks (LQs) provide very promising solutions to the tensions between the experimental measurements and the SM predictions of b → s + − and b → cτ ν processes. In this case the LQ masses are in general at the TeV scale and they can thus be produced at high energy colliders and dedicated LHC searches are ongoing. While for LQ production and decay the O(αs) corrections have been known for a long time, the O(αs) corrections to the matching on 2-quark-2-lepton operators have not been calculated, yet. In this article we close this gap by computing the QCD corrections to the matching of LQ models on the effective SM Lagrangian for both scalar and vector LQs. We find an enhancement of the Wilson coefficients of vector operators with respect to the tree-level results of around 8 % (13 %) if they originate from scalar (vector) LQs. This softens the LHC bounds and increases the allowed parameter space of LQ models addressing the flavour anomalies.

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Phenomenological determination of electroproduction structure functions

Cited by 11 publications

References 25 publications

GUT Physics in the Era of the LHC

GUT Physics in the Era of the LHC

Combined explanations of B-physics anomalies: the sterile neutrino solution

QCD improved matching for semileptonic B decays with leptoquarks

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