Same-sign top quarks as signature of light stops at the CERN LHC

Journal Article · Sat Apr 01 00:00:00 EST 2006 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.73.075002· OSTI ID:20782833

Kraml, S ^[1]; Raklev, A R ^[2]

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1. Theory Division, Dept. of Physics, CERN, CH-1211 Geneva 23 (Switzerland)
2. Dept. of Physics and Technology, University of Bergen, N-5007 Bergen (Norway)

We present a new method to search for a light scalar top with m{sub t-}t{sub ilde{sub 1}} < or approx. m{sub t}, decaying dominantly into a c-jet and the lightest neutralino, at the LHC. The principal idea is to exploit the Majorana nature of the gluino, leading to same-sign top quarks in events of gluino-pair production followed by gluino decays into top and stop. The resulting signature is 2 b-jets plus 2 same-sign leptons plus additional jets and missing energy. We perform a Monte Carlo simulation for a benchmark scenario, which is in agreement with the recent WMAP bound on the relic density of dark matter, and demonstrate that for m{sub g-tilde} < or approx. 900 GeV and m{sub q-tilde}>m{sub g-tilde} the signal can be extracted from the background. Moreover, we discuss the determination of the stop and gluino masses from the shape of invariant-mass distributions. The derivation of the shape formulas is also given.

• OSTI ID: 20782833
• Journal Information: Physical Review. D, Particles Fields, Vol. 73, Issue 7; Other Information: DOI: 10.1103/PhysRevD.73.075002; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CERN LHC
COMPUTERIZED SIMULATION
GEV RANGE
INCLUSIVE INTERACTIONS
LEPTONS
MASS DISTRIBUTION
MONTE CARLO METHOD
NONLUMINOUS MATTER
PAIR PRODUCTION
PARTICLE DECAY
PARTICLE IDENTIFICATION
PROTON-PROTON INTERACTIONS
REST MASS
SCALARS
SPARTICLES
SUPERSYMMETRY
T QUARKS