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High Energy Physics - Phenomenology

arXiv:hep-ph/0511115 (hep-ph)
[Submitted on 9 Nov 2005 (v1), last revised 10 Nov 2005 (this version, v2)]

Title:Measuring slepton spin at the LHC

Authors:A.J. Barr
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Abstract: A new method is presented for measuring the spin of selectrons and smuons at the Large Hadron Collider (LHC), using an angular variable which is sensitive to the polar angle in direct slepton pair production. This variable is invariant under boosts along the beam axis, so it can be used at the LHC despite the fact that the longitudinal boost of the centre-of-mass frame cannot be determined. Monte Carlo simulations demonstrate that, using this method, the LHC can distinguish between the supersymmetric production angular distribution and phase space, or between supersymmetry and the production angular distribution of universal extra dimensions. An integrated luminosity of about 100 to 300 inverse fb provides sufficient statistics to measure the slepton spin for points which had left-handed slepton masses in the range 202 to 338 GeV, and right-handed sleptons in the range 143 to 252 GeV. Good sensitivity was found in the `bulk' and `stau co-annihilation' regions of the cMSSM favoured by cosmological relic density measurements. Various systematic uncertainties are investigated, and some methods for reducing them are discussed.
Comments: 21 pages, 10 figures. v2: minor grammatical corrections, small correction to fig 7
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: ATL-PHYS-PUB-2005-023
Cite as: arXiv:hep-ph/0511115
  (or arXiv:hep-ph/0511115v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0511115
Journal reference: JHEP0602:042,2006
Related DOI: https://doi.org/10.1088/1126-6708/2006/02/042

Submission history

From: Alan Barr [view email]
[v1] Wed, 9 Nov 2005 17:46:31 UTC (63 KB)
[v2] Thu, 10 Nov 2005 18:48:41 UTC (62 KB)
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