Single neutralino production at the LHC

Self Cite

We provide complete one-loop predictions for the direct production of the neutralino pairs via photon-photon collisions which appears for the first time at one-loop level in the minimal supersymmetric standard model at the International Linear Collider. We present a comprehensive investigation of the dependence of total cross section on the center-of-mass energy and the tanβ for three different scenarios based on gaugino/Higgsino fractions of the neutralinos. Furthermore, by investigating the behavior with the most relevant parameters µ and M2, we exhibit regions of the parameter space where the enhancement of the cross section is large enough to be detectable at linear colliders. Our analysis shows that the corresponding production cross section reaches its highest values when the lightest neutralino χ 0 1 has a dominant Higgsino component and/or the next-to-lightest neutralino χ 0 2 has a dominant gaugino component.

Section: Parameter Settingsmentioning

confidence: 99%

“…For more details on the definition of these scenarios, we refer to Ref. [39]. We set the chargino masses as [20], and ignore the masses of the light quarks.…”

Section: Parameter Settingsmentioning

confidence: 99%

Neutralino pair production via photon-photon collisions at the ILC

Demirci¹,

Ahmadov²

2016

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“…We now give the information about our method and input parameters used in the numerical analysis. During our numerical evaluations, we take into account the assumptions and approaches in our previous paper [29] for the gaugino/Higgsino sector. The soft SUSY-breaking gaugino mass parameters M 1 , M 2 and the Higgsino mass parameter µ can be taken to be real and positive.…”

Section: Parameter Spacementioning

confidence: 99%

“…(A13) and (A14) in Ref. [29] by taking the suitable differences and sums of the chargino masses. Consequently, there appear three different cases in the selection of the gaugino/Higgsino mass parameters M 2 and µ.…”

Section: Parameter Spacementioning

confidence: 99%

Search for neutralino pair production at the CERN LHC

Demirci

Ahmadov

2014

Self Cite

We provide the next-to-leading order (NLO) predictions for the neutralino pair production via quark-antiquark annihilation and gluon-gluon fusion at the CERN Large Hadron Collider, focusing on the lightest neutralino which is likely to be the lightest supersymmetric particle. The dependence of total LO, NLO cross sections, and K factor on the center-of-mass energy, the M2-µ mass plane, the squark mass, and the factorization and renormalization scales is comprehensively analyzed for three different scenarios in the minimal supersymmetric standard model and the constrained minimal supersymmetric standard model. We find that the LO cross section is considerably increased by the NLO correction, and the K factor value is clearly related to the Higgsino/gaugino mass parameters, the squark mass, and the factorization and renormalization scales.

“…Experimental measurements of supersymmetric (SUSY) production cross sections at the ongoing Run II of the LHC require precise theoretical calculations at the level of next-toleading order (NLO) QCD and beyond [14][15][16][17][18][19][20][21][22][23]. In the perturbative expansion, logarithmically enhanced terms appear beyond leading order in the strong coupling constant α s , whose contributions can be sizeable close to production threshold or at small transverse momentum of the produced SUSY particle pair.…”

Section: Introductionmentioning

confidence: 99%

Neutralino-chargino pair production at NLO+NLL with resummation-improved parton density functions for LHC Run II

Fiaschi

Klasen

2018

We make use of recently released parton density functions (PDFs) with threshold-resummation improvement to consistently calculate theoretical predictions for neutralino and chargino pair production at next-to-leading order and next-to-leading logarithmic accuracy. The updated cross sections have been computed for experimentally relevant higgsino and gaugino search channels at the ongoing Run II of the LHC. A factorisation method is applied to exploit the smaller PDF uncertainty of the global PDF sets and to avoid complications arising in the refitting of thresholdresummation improved PDF replicas in Mellin space. The reduction of the scale uncertainty due to the resummation is, however, explicitly taken into account. As expected, the resummation contributions in the PDF fits partially compensate the cross section enhancements induced by those in the partonic matrix elements.