7,385 research outputs found
Prospects of Discovery for Supersymmetry at the Tevatron
We summarize a discovery potential for supersymmetric particles at the \ppbar
collider of Tevatron with center-of-mass energy \sqrt{s} = 2 TeV and integrated
luminosity \intlum = 15-30 \invfb. Any direct search is kinematically limited
to below 450 \mgev. We, however, have a unique opportunity to test various
supersymmetric scenarios by a measurement of the branching ratio for the rare
decay mode \bsmumu. Using the background estimate in the CDF analysis of
\bsmumu in Run I, we investigate the prospects for studying this mode in Run
II. CDF would be sensitive to this decay for a branching ratio > 1.2 \times
10^{-8} with 15 \invfb (or, if a similar analysis holds for \Dzero, >6.5\times
10^{-9} for the combined data). For \tanb > 30, the \bsmumu search can probe
the SUSY parameter space that cannot be probed by direct production of SUSY
particles at Run II. An observation of \bsmumu with a large branching ratio >
7(14) \times 10^{-8} (feasible with only 2 \invfb) would be sufficient to
exclude the mSUGRA model for \tan\beta \leq 50 (55) including other
experimental constraints. For some models, the branching ratio can be large
enough to be detected even for small and large \mhalf.Comment: 16 pages, latex, 4 figures, talk at 10th International Conference on
Supersymmetry and Unification of Fundamental Interactions (SUSY02),June
17-23, 2002, DESY, Hamburg, German
Minimal SUGRA Model and Collider Signals
The SUSY signals in the dominant stau-neutralino coannihilation region at a
500(800) GeV linear collider are investigated. The region is consistent with
the WMAP measurement of the cold dark matter relic density as well as all other
current experimental bounds within the mSUGRA framework. The signals are
characterized by an existence of very low-energy tau leptons in the final state
due to small mass difference between stau_1 and chi_1 (5-15 GeV). We study the
accuracy of the mass difference measurement with a 1^deg active mask to reduce
a huge SM two-photon background.Comment: 4 pages, 3 figures, Talk presented at ICHEP04, Aug.16-22, Beijing,
China, Numerical typos in Table 5 and 6 are corrected, no changes in figures
and in other numerical result
Detection of SUSY Signals in Stau Neutralino Co-annihilation Region at the LHC
We study the prospects of detecting the signal in the stau neutralino
co-annihilation region at the LHC using tau leptons. The co-annihilation signal
is characterized by the stau and neutralino mass difference (dM) to be 5-15 GeV
to be consistent with the WMAP measurement of the cold dark matter relic
density as well as all other experimental bounds within the minimal
supergravity model. Focusing on tau's from neutralino_2 --> tau stau --> tau
tau neutralino_1 decays in gluino and squark production, we consider inclusive
MET+jet+3tau production, with two tau's above a high E_T threshold and a third
tau above a lower threshold. Two observables, the number of opposite-signed tau
pairs minus the number of like-signed tau pairs and the peak position of the
di-tau invariant mass distribution, allow for the simultaneous determination of
dM and M_gluino. For dM = 9 GeV and M_gluino = 850 GeV with 30 fb^-1 of data,
we can measure dM to 15% and M_gluino to 6%.Comment: 4 pages LaTex, 3 figures. To appear in Proceedings of SUSY06, the
14th International Conference on Supersymmetry and the Unification of
Fundamental Interactions, UC Irvine, California, 12-17 June 2006. A typo in a
reference is correcte
- …