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X iv :n uc lth /0 20 90 89 v 4 1 4 A ug 2 00 3 The Mini-Jet Scale and Energy Loss at RHIC in the HIJING and RQMD Models V. Topor Pop, M. Gyulassy, J. Barrette, C. Gale, X. N. Wang, N. Xu, K. Filimonov 1McGill, University, Montreal, Canada, H3A 2T8 2Physics Department, Columbia University, New York, N.Y. 10027 3Nuclear Science Division, LBNL, Berkeley, CA 94720 (August 15, 2003) Recent data from...
The performance of the Compact Muon Solenoid detector for measuring missing transverse energy is evaluated using fully simulated pp collisions at a center-of-mass energy of 14 TeV at the Large Hadron Collider. For minimum bias events without pileup, a resolution of 6.1 GeV is computed, corresponding to a stochastic contribution of 0.63 √ ΣETGeV , where ΣET is the summed transverse energy in all...
The proton-to-pion yield ratios measured in the BRAHMS experiment for Au+Au and p+p collisions at √ s NN = 62.4 GeV and √ s NN = 200 GeV are presented as a function of transverse momentum and collision centrality within the pseudorapidity range 0 ≤ η ≤ 3.8. A strong pseu-dorapidity dependence of these ratios is observed. In Au+Au collisions at √ s NN = 200 GeV, η ≈ 2.2, and at √ s NN = 62.4 GeV...
It has been suggested that the interactions of energetic particles with the foamy structure of space-time thought to be generated by quantum-gravitational (QG) effects might violate Lorentz invariance, so that they do not propagate at a universal speed of light. We consider the limits that may be set on a linear or quadratic violation of Lorentz invariance in the propagation of energetic neutri...
Analyzing DISTO data of pp → pΛK at Tp = 2.50 and 2.85 GeV to populate a previously reported X(2265) resonance with MX = 2267 MeV/c 2 and ΓX = 118 MeV at 2.85 GeV, we found that the production of X(2265) at 2.50 GeV is much less than that at 2.85 GeV (less than 10%), though it is expected from a kinematical consideration to be produced as much as 33% of that at 2.85 GeV. The small population of...
The dark photon A^{'} and the dark Higgs boson h^{'} are hypothetical constituents featured in a number of recently proposed dark sector models. Assuming prompt decays of both dark particles, we search for their production in the so-called Higgstrahlung channel e^{+}e^{-}→A^{'}h^{'}, with h^{'}→A^{'}A^{'}. We investigate ten exclusive final states with A^{'}→e^{+}e^{-}, μ^{+}μ^{-}, or π^{+}π^{-...
An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a sneutrino with mass above 300 GeV/c and a mass difference between the chargino and the lightest neutralino above 10 GeV/c the lower limit at 95% confidence level on the chargino mass ranges from 84.5 Ge...
A global analysis is performed using the latest data from LEP and SLC. Constraints on the electroweak universal parameters (S, T, U) and on the masses of the top quark and Higgs boson within the Standard Model (SM) are investigated. The uncertainties due to the QCD and QED effective couplings, α s (m Z) and ¯ α(m 2 Z), are examined in detail. Even though the mean value of S is increased to be c...
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