Signal and backgrounds for leptoquarks at the CERN LHC

Éboli, Oscar José Pinto; Funchal, R. Zukanovich; Lungov, T.

doi:10.1103/physrevd.57.1715

Cited by 33 publications

(38 citation statements)

References 56 publications

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“…From a phenomenological perspective, the first solid step is to extract from current rare process data the bounds on |λ LQ | 2 /m 2 S , as was done recently, for instance, in [12] 2 and [13,14]. In this paper, we fix m S ∼ 300 GeV, which is of order of the Tevatron lower limits 3 [15][16][17][18] m S 250 − 300 GeV (1.1) and accessible to the LHC [19][20][21][22]. Then we explore various patterns for the λ LQ , constructed from the SM Yukawa couplings, which are consistent with the bounds.…”

Section: Jhep11(2010)073mentioning

confidence: 99%

“Minimal Flavour Violation” for leptoquarks

Davidson

Descotes-Genon

2010

J. High Energ. Phys.

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Scalar leptoquarks, with baryon and lepton number conserving interactions, could have TeV scale masses, and be produced at colliders or contribute to a wide variety of rare decays. In pursuit of some insight as to the most sensitive search channels, we assume that the leptoquark-lepton-quark coupling can be constructed from the known mass matrices. We estimate the rates for selected rare processes in three cases: leptoquarks carrying lepton and quark flavour, leptoquarks with quark flavour only, and unflavoured leptoquarks. We find that leptoquark decay to top quarks is an interesting search channel.

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Section: Jhep11(2010)073mentioning

confidence: 99%

“Minimal Flavour Violation” for leptoquarks

Davidson

Descotes-Genon

2010

J. High Energ. Phys.

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“…In this section we will discuss the production cross-section for the leptoquark and diquark cases before considering the direct search limits in the next section. Some aspects of the production of exotic SU (3)-charged states have been considered elsewhere [55,56,57,58,59,60,61], at varying levels of sophistication and approximation.…”

Section: Production At Hadron Collidersmentioning

confidence: 99%

“…This may arise through mixing operators or by considering only the production and decay of scalar exotics with branching fractions to pairs of SM fermions set to unity [55,56,57,58,59,60,61]. In order to discuss the full range of supersymmetric decays available -and to study the interesting issues outlined in the introduction to this section, it is necessary to postulate a fixed spectrum of MSSM states to include with the five scenarios of Table II. Our MSSM "background" sample corresponds to the minimal supergravity point SPS 1a, from the Snowmass Points & Slopes [67].…”

Section: A Decays Of Exoticsmentioning

confidence: 99%

Theory and phenomenology of exotic isosinglet quarks and squarks

2008

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Extensions of the MSSM often predict the existence of new fermions and their scalar superpartners which are vectorlike with respect to the standard model gauge group but may be chiral under additional gauge factors. In this paper we explore the production and decay of an important example, i.e., a heavy isosinglet charge −1/3 quark and its scalar partner, using the charge assignments of a 27-plet of E6 for illustration. We emphasize that, depending on the symmetries of the low energy theory, such exotic particles may decay by the mixing of the fermion with the d, s, or b quarks; may decay by leptoquark or diquark couplings (which may nevertheless preserve a form of R-parity); or may be stable with respect to renormalizable couplings but decay by higher-dimension operators on cosmological times scales. We discuss the latter two possibilities in detail for various assumptions concerning the relative masses of the exotic fermions, scalars, and the lightest neutralino, and emphasize the necessity of considering the collider signatures in conjunction with the normal MSSM processes. Existing and projected constraints from colliders, indirect experiments, proton decay, and big bang nucleosynthesis are considered.

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“…The main background to leptoquark pair production at the Tevatron comes from Z * + 2 jets ( Fig.2(a)) in the dielectron channel and from W * + 2 jets ( Fig.2(b)) in the electron plus missing transverse energy channel [15,16,23,24,25].In the latter case, the source of hard electrons comes from the leptonic decay of the gauge bosons while the jets typically arise from gluon radiation from incoming partons. Although potentially large, this background can be reduced by an invariant mass cut on the lepton pair (dielectron case) or a transverse mass cut on the lepton and missing p T (single electron case).…”

Section: Gauge Boson Productionmentioning

confidence: 99%

Scalar and vector leptoquark pair production at hadron colliders: Signal and backgrounds

1998

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We perform a systematic analysis of scalar and vector leptoquark pair production at the Fermilab Tevatron and at the CERN LHC. We evaluate signal expectations and background levels for the processes pp(pp) → 2 jets + e + e − and 2 jets + e+ p T . The Monte Carlo event generator ISAJET is used to simulate the experimental conditions at the current ( √ s = 1.8 TeV, L = 100 pb −1 ) and upgraded (L = 2 fb −1 ) Tevatron as well as the LHC ( √ s = 14 TeV, L = 10 fb −1 ). Depending on the luminosity, and assuming a branching ratio B(LQ → eq) = 0.5, we find a discovery reach up to 170 (255) GeV for scalar leptoquarks at the current (upgraded) Tevatron. Similarly, we find vector leptoquarks to be detectable at masses below 300 (400) GeV depending on the coupling. At the LHC, the discovery reach is enhanced to 1 TeV for scalar leptoquarks and to 1.5 TeV for vectors.

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Signal and backgrounds for leptoquarks at the CERN LHC

Cited by 33 publications

References 56 publications

“Minimal Flavour Violation” for leptoquarks

“Minimal Flavour Violation” for leptoquarks

Theory and phenomenology of exotic isosinglet quarks and squarks

Scalar and vector leptoquark pair production at hadron colliders: Signal and backgrounds

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