Squark–anti-squark pair production at the LHC: the electroweak contribution

Hollik, W.; Mirabella, Edoardo

doi:10.1088/1126-6708/2008/12/087

Cited by 30 publications

(48 citation statements)

References 80 publications

(113 reference statements)

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“…in Refs. [5,6], DREG has been used for the supersymmetric QCD-part of the calculations, so that MS-PDFs could be used, and the required supersymmetryrestoring counterterm [9] has been added by hand. This procedure required a mixed DRED/DREG regularization in Ref.…”

Section: Discussionmentioning

confidence: 99%

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FeynArts model file for MSSM transition counterterms from DREG to DRED

Stöckinger

Varšo

2012

Computer Physics Communications

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The FeynArts model file MSSMdreg2dred.mod implements MSSM transition counterterms which can convert one-loop Green functions from dimensional regularization to dimensional reduction. They correspond to a slight extension of the wellknown Martin/Vaughn counterterms, specialized to the MSSM, and can serve also as supersymmetry-restoring counterterms. The paper provides full analytic results for the counterterms and gives one-and two-loop usage examples. The model file can simplify combining MS-parton distribution functions with supersymmetric renormalization or avoiding the renormalization of ǫ-scalars in dimensional reduction. The computation of one-loop Feynman diagrams in the minimal supersymmetric standard model (MSSM) requires regularization. Two schemes, dimensional regularization and dimensional reduction are both common but have different pros and cons. In order to combine the advantages of both schemes one would like to easily convert existing results from one scheme into the other. Solution method: Finite counterterms are constructed which correspond precisely to the one-loop scheme differences for the MSSM. They are provided as a FeynArts [2] model file. Using this model file together with FeynArts, the (ultra-violet) regularization of any MSSM one-loop Green function is switched automatically from dimensional regularization to dimensional reduction. In particular the counterterms serve as supersymmetry-restoring counterterms for dimensional regularization. Restrictions: The counterterms are restricted to the one-loop level and the MSSM. * PROGRAM SUMMARY

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Section: Discussionmentioning

confidence: 99%

“…Refs. [5,6] provide examples of MSSM computations where DREG has been used, and where the breaking of supersymmetry has been compensated by adding appropriate supersymmetry-restoring counterterms. Given that both DREG and DRED have specific advantages it would be optimal to be able to combine these advantages in practical computations.…”

Section: Introductionmentioning

confidence: 99%

FeynArts model file for MSSM transition counterterms from DREG to DRED

Stöckinger

Varšo

2012

Computer Physics Communications

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“…The cross sections for the squark and gluino pair-production processes (1) have been known at next-to-leading order in SUSY-QCD [9][10][11][12] for some time. Electroweak corrections to the O(α 2 s ) tree-level production [19][20][21][22][23] and the electroweak Born production channels of O(αα s ) and O(α 2 ) [24,25] are significant for the pair production of SU(2)-doublet squarksq L and at large invariant masses in general, but they are moderate for total cross sections summed over all squark species.…”

Section: Squark and Gluino Cross Sectionsmentioning

confidence: 99%

Improved squark and gluino mass limits from searches for supersymmetry at hadron colliders

Beenakker¹,

Brensing²,

D’Onofrio

et al. 2012

Phys. Rev. D

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Squarks and gluinos have been searched for at hadron colliders in events with multiple jets and missing transverse energy. No excess has been observed to date, and from a comparison of experimental cross section limits and theoretical cross section predictions one can deduce lower bounds on the squark and gluino masses. We present an improved analysis of squark and gluino mass bounds which is based on state-of-the-art cross section calculations including the summation of large threshold corrections. For illustration, we consider experimental data obtained by the CDF collaboration at the Fermilab Tevatron and discuss the impact of the improved cross section predictions on the squark and gluino mass limits.

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“…These contributions have also been studied in the context of non-minimal flavor violation [26] and explicit CP violation [27]. The photon-induced channels are typically more important for the pair production of lighter stops [28], and have a reduced impact on squark-anti-squark [29] and gluino-squark production [30].…”

Section: Jhep08(2010)023mentioning

confidence: 99%

“…NLO EW corrections contribute at O(α 2 s α) and have been investigated for stop-antistop [28,31], squark-anti-squark [29], gluino-squark [30] and gluino-gluino [32] production processes. In this paper, we provide the yet-missing NLO EW corrections to squark-squark production.…”

Section: Jhep08(2010)023mentioning

confidence: 99%

Hadronic production of squark-squark pairs: the electroweak contributions

Germer

Hollik

Mirabella

et al. 2010

J. High Energ. Phys.

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Abstract:We compute the electroweak (EW) contributions to squark-squark pair production processes at the LHC within the framework of the Minimal Supersymmetric Standard Model (MSSM). Both tree-level EW contributions, of O(α s α + α 2 ), and next-to-leading order (NLO) EW corrections, of O(α 2 s α), are calculated. Depending on the flavor and chirality of the produced squarks, many interferences between EW-mediated and QCD-mediated diagrams give non-zero contributions at tree-level and NLO. We discuss the computational techniques and present an extensive numerical analysis for inclusive squark-squark production as well as for subsets and single processes. While the tree-level EW contributions to the integrated cross sections can reach the 20% level, the NLO EW corrections typically lower the LO prediction by a few percent.

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Squark–anti-squark pair production at the LHC: the electroweak contribution

Cited by 30 publications

References 80 publications

FeynArts model file for MSSM transition counterterms from DREG to DRED

FeynArts model file for MSSM transition counterterms from DREG to DRED

Improved squark and gluino mass limits from searches for supersymmetry at hadron colliders

Hadronic production of squark-squark pairs: the electroweak contributions

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