Impact of the recent results by the CMS and ATLAS collaborations at the CERN Large Hadron Collider on an effective minimal supersymmetric extension of the standard model

S. Scopel, Suyong Choi, N. Fornengo, A. Bottino

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Abstract

We discuss the impact for light neutralinos in an effective minimal supersymmetric extension of the standard model of the recent results presented by the CMS and ATLAS Collaborations at the CERN Large Hadron Collider for a search of supersymmetry in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 35pb-1. We find that, in the specific case of light neutralinos, efficiencies for the specific signature searched by ATLAS (jets+missing transverse energy and an isolated lepton) imply a lower sensitivity compared to CMS (which searches for jets+missing transverse energy). Focusing on the CMS bound, if squark soft masses of the three families are assumed to be degenerate, the combination of the ensuing constraint on squark and gluino masses with the experimental limit on the b→s+γ decay imply a lower bound on the neutralino mass mχ that can reach the value of 11.9 GeV, depending on the gluino mass. On the other hand, when the universality condition among squark soft parameters is relaxed, the lower bound on mχ is not constrained by the CMS measurement and then remains at the value 7.5 GeV derived in previous papers.

Original languageEnglish
Article number095016
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume83
Issue number9
DOIs
Publication statusPublished - 2011 May 23

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protons
supersymmetry
center of mass
energy
leptons
luminosity
signatures
collisions
sensitivity
decay

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

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title = "Impact of the recent results by the CMS and ATLAS collaborations at the CERN Large Hadron Collider on an effective minimal supersymmetric extension of the standard model",
abstract = "We discuss the impact for light neutralinos in an effective minimal supersymmetric extension of the standard model of the recent results presented by the CMS and ATLAS Collaborations at the CERN Large Hadron Collider for a search of supersymmetry in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 35pb-1. We find that, in the specific case of light neutralinos, efficiencies for the specific signature searched by ATLAS (jets+missing transverse energy and an isolated lepton) imply a lower sensitivity compared to CMS (which searches for jets+missing transverse energy). Focusing on the CMS bound, if squark soft masses of the three families are assumed to be degenerate, the combination of the ensuing constraint on squark and gluino masses with the experimental limit on the b→s+γ decay imply a lower bound on the neutralino mass mχ that can reach the value of 11.9 GeV, depending on the gluino mass. On the other hand, when the universality condition among squark soft parameters is relaxed, the lower bound on mχ is not constrained by the CMS measurement and then remains at the value 7.5 GeV derived in previous papers.",
author = "S. Scopel and Suyong Choi and N. Fornengo and A. Bottino",
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T1 - Impact of the recent results by the CMS and ATLAS collaborations at the CERN Large Hadron Collider on an effective minimal supersymmetric extension of the standard model

AU - Scopel, S.

AU - Choi, Suyong

AU - Fornengo, N.

AU - Bottino, A.

PY - 2011/5/23

Y1 - 2011/5/23

N2 - We discuss the impact for light neutralinos in an effective minimal supersymmetric extension of the standard model of the recent results presented by the CMS and ATLAS Collaborations at the CERN Large Hadron Collider for a search of supersymmetry in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 35pb-1. We find that, in the specific case of light neutralinos, efficiencies for the specific signature searched by ATLAS (jets+missing transverse energy and an isolated lepton) imply a lower sensitivity compared to CMS (which searches for jets+missing transverse energy). Focusing on the CMS bound, if squark soft masses of the three families are assumed to be degenerate, the combination of the ensuing constraint on squark and gluino masses with the experimental limit on the b→s+γ decay imply a lower bound on the neutralino mass mχ that can reach the value of 11.9 GeV, depending on the gluino mass. On the other hand, when the universality condition among squark soft parameters is relaxed, the lower bound on mχ is not constrained by the CMS measurement and then remains at the value 7.5 GeV derived in previous papers.

AB - We discuss the impact for light neutralinos in an effective minimal supersymmetric extension of the standard model of the recent results presented by the CMS and ATLAS Collaborations at the CERN Large Hadron Collider for a search of supersymmetry in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 35pb-1. We find that, in the specific case of light neutralinos, efficiencies for the specific signature searched by ATLAS (jets+missing transverse energy and an isolated lepton) imply a lower sensitivity compared to CMS (which searches for jets+missing transverse energy). Focusing on the CMS bound, if squark soft masses of the three families are assumed to be degenerate, the combination of the ensuing constraint on squark and gluino masses with the experimental limit on the b→s+γ decay imply a lower bound on the neutralino mass mχ that can reach the value of 11.9 GeV, depending on the gluino mass. On the other hand, when the universality condition among squark soft parameters is relaxed, the lower bound on mχ is not constrained by the CMS measurement and then remains at the value 7.5 GeV derived in previous papers.

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