Minimal Supergravity (mSUGRA) [1] Supersimmetry breaking mechanism is a leading candidate for yielding new physics beyond the Standard Model (SM). Within mSUGRA framework masses, mixings and decays of all SUSY and Higgs particles are determined in terms of four input parameters and a sign: the common mass m 0 of scalar particles at the grand unification scale, the common fermion mass m 1/2, the common trilinear coupling A 0, the ratio of the Higgs vacuum expectation values tan β and the sign of the supersymmetric Higgs mass parameter μ. Once a signal of a physics beyond the Standard Model is seen at LHC, it will be fundamental to measure properties of new particles, like spin, in order to prove that they are indeed supersymmetric partners. The present work [2] is based on the spin analysis method proposed in [3] and allows the discrimination of different hypotheses for spin assignments. Some studies [4, 5] show that this method can also be used for the discrimination of SUSY from an Universal Extra Dimensions model which can mimick low energy SUSY at hadron colliders. In this report two selected points inside stau-coannihilation and bulk regions of the allowed mSUGRA parameter space are considered. Fast simulation [6] of the ATLAS detector was performed in order to investigate the feasibility of supersymmetric particles’ spin measurement.

Neutralino spin measurement with ATLAS detector at LHC

Gorini, E.;Spagnolo, S.;Ventura, A.
2008

Abstract

Minimal Supergravity (mSUGRA) [1] Supersimmetry breaking mechanism is a leading candidate for yielding new physics beyond the Standard Model (SM). Within mSUGRA framework masses, mixings and decays of all SUSY and Higgs particles are determined in terms of four input parameters and a sign: the common mass m 0 of scalar particles at the grand unification scale, the common fermion mass m 1/2, the common trilinear coupling A 0, the ratio of the Higgs vacuum expectation values tan β and the sign of the supersymmetric Higgs mass parameter μ. Once a signal of a physics beyond the Standard Model is seen at LHC, it will be fundamental to measure properties of new particles, like spin, in order to prove that they are indeed supersymmetric partners. The present work [2] is based on the spin analysis method proposed in [3] and allows the discrimination of different hypotheses for spin assignments. Some studies [4, 5] show that this method can also be used for the discrimination of SUSY from an Universal Extra Dimensions model which can mimick low energy SUSY at hadron colliders. In this report two selected points inside stau-coannihilation and bulk regions of the allowed mSUGRA parameter space are considered. Fast simulation [6] of the ATLAS detector was performed in order to investigate the feasibility of supersymmetric particles’ spin measurement.
978-88-470-0746-8
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11587/436747
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