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Journal of High Energy Physics Volume 2009 JHEP10(2009) Create an alert RSS this journal

Howard Baer et al JHEP10(2009)078 doi:10.1088/1126-6708/2009/10/078

Prospects for hypercharged anomaly mediated SUSY breaking at the LHC

Howard Baera, Radovan Dermíšekb, Shibi Rajagopalana and Heaya Summya

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Abstract References Cited By
We investigate the phenomenological consequences of string models wherein the MSSM resides on a D-brane, and the hypercharge gaugino mass is generated in a geometrically separated hidden sector. This hypercharged anomaly-mediated SUSY breaking (HCAMSB) model naturally solves the tachyonic slepton mass problem endemic to pure AMSB scenarios. In HCAMSB, one obtains a mass ordering M1>μ>M2 with split left- and right- scalars, whereas in mAMSB models, one obtains μ>M1>M2 with nearly degenerate left- and right- scalars. We compute the allowed parameter space and expected superparticle mass spectrum in the HCAMSB model. For low values of the HC and AMSB mixing parameter α, the spectra is characterized by light left-sleptons, while the spectra for large α is characterized by light top- and bottom- squarks. We map out the approximate reach of LHC for HCAMSB, and find that with 100 fb−1 of integrated luminosity, a gravitino mass of ~ 115 (105) TeV can be probed for low (high) values of α, corresponding to a gluino mass reach of ~ 2.4 (2.2) TeV. Both cases contain — as is typical in AMSB models — long lived charginos that should yield visible highly ionizing tracks in the LHC detector. Also, in the lower tan β range, HCAMSB models give rise to reconstructable Z → ℓbar l candidates in SUSY cascade decay events, while mAMSB models should do so only rarely.

Keywords

Supersymmetry Phenomenology

 

E-print Number: 0908.4259

Cited: by |

Refers: to

PACS

11.30.Pb Supersymmetry

11.25.Uv D branes

14.70.Hp Z bosons

11.30.Qc Spontaneous and radiative symmetry breaking

12.60.Jv Supersymmetric models

14.80.Ly Supersymmetric partners of known particles

Subjects

Particle physics and field theory

Dates

Issue 10 (October 2009)

Received 2 September 2009, accepted for publication 1 October 2009

Published 27 October 2009



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