Scalar-leptoquark production at hadron colliders

Abstract When a TeV-scale leptoquark has a sizeable Yukawa coupling, its dominant production mechanism at hadron colliders is the partonic-level lepton-quark fusion. Even though the parton distribution functions for leptons inside the proton are minuscule, they get compensated by the resonant enhancement. We present the first computation of higher order radiative corrections to the resonant leptoquark production cross section at the Large Hadron Collider (LHC). Next-to-leading (NLO) QCD and QED corrections are similar in size but come with the opposite sign. We compute NLO K-factors for a wide range of scalar leptoquark masses, as well as, all possible combinations of quark and lepton flavors and leptoquark charges. Theoretical uncertainties due to the renormalisation and factorisation scale variations and the limited knowledge of parton distribution functions are quantified. We finally discuss how to disentangle the flavor structure of leptoquark interactions by exploiting the interplay between different production channels.

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Scalar leptoquark pair production at hadron colliders

Physical Review D ◽

10.1103/physrevd.101.115017 ◽

2020 ◽

Vol 101 (11) ◽

Cited By ~ 3

Author(s):

Christoph Borschensky ◽

Benjamin Fuks ◽

Anna Kulesza ◽

Daniel Schwartländer

Keyword(s):

Pair Production ◽

Hadron Colliders ◽

Scalar Leptoquark

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The Z boson aTdistribution at hadron colliders

10.3360/dis.2009.70 ◽

2009 ◽

Author(s):

Andrea Banfi ◽

Rosa Maria Duran Delgado ◽

Mrinal Dasgupta

Keyword(s):

Z Boson ◽

Hadron Colliders

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Parity-Odd Asymmetries inW-Jet Events at Hadron Colliders

Physical Review Letters ◽

10.1103/physrevlett.52.1076 ◽

1984 ◽

Vol 52 (13) ◽

pp. 1076-1079 ◽

Cited By ~ 27

Author(s):

Kaoru Hagiwara ◽

Ken-ichi Hikasa ◽

Naoyuki Kai

Keyword(s):

Hadron Colliders

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Extraction of the strong coupling αs(mZ) from a combined NNLO analysis of inclusive electroweak boson cross sections at hadron colliders

Journal of High Energy Physics ◽

10.1007/jhep06(2020)016 ◽

2020 ◽

Vol 2020 (6) ◽

Author(s):

David d’Enterria ◽

Andres Poldaru

Keyword(s):

Strong Coupling ◽

Cross Sections ◽

Hadron Colliders ◽

Electroweak Boson

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Optimized probes of CP-odd effects in the tt¯h process at hadron colliders

Nuclear Physics B ◽

10.1016/j.nuclphysb.2021.115328 ◽

2021 ◽

Vol 964 ◽

pp. 115328

Author(s):

Blaž Bortolato ◽

Jernej F. Kamenik ◽

Nejc Košnik ◽

Aleks Smolkovič

Keyword(s):

Hadron Colliders

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Interplay of New Physics effects in (g − 2)ℓ and h → ℓ+ℓ− — lessons from SMEFT

Journal of High Energy Physics ◽

10.1007/jhep06(2021)099 ◽

2021 ◽

Vol 2021 (6) ◽

Author(s):

Svjetlana Fajfer ◽

Jernej F. Kamenik ◽

M. Tammaro

Keyword(s):

Closed Operator ◽

Higgs Doublet ◽

New Physics ◽

Effective Field ◽

Tree Level ◽

Electroweak Symmetry ◽

Scalar Leptoquark ◽

Doublet Model ◽

The One ◽

Two Higgs Doublet Model

Abstract We explore the interplay of New Physics (NP) effects in (g− 2)ℓ and h→ℓ+ℓ− within the Standard Model Effective Field Theory (SMEFT) framework, including one-loop Renormalization Group (RG) evolution of the Wilson coefficients as well as matching to the observables below the electroweak symmetry breaking scale. We include both the leading dimension six chirality flipping operators including a Higgs and SU(2)L gauge bosons as well as four-fermion scalar and tensor operators, forming a closed operator set under the SMEFT RG equations. We compare present and future experimental sensitivity to different representative benchmark scenarios. We also consider two simple UV completions, a Two Higgs Doublet Model and a single scalar LeptoQuark extension of the SM, and show how tree level matching to SMEFT followed by the one-loop RG evolution down to the electroweak scale can reproduce with high accuracy the (g−2)ℓ and h→ℓ+ℓ− contributions obtained by the complete one- and even two-loop calculations in the full models.

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