2,409 research outputs found
Simulation results of dE/dx analysis in ALICE ITS
No full textThe particle identification by using dE/dx analysis in the ALICE silicon Inner Tracking System was studied by simulations. Correction procedures were considered and used to improve charge collection and resolution. Particle identification efficiencies and contamination rates depending in function of momentum were obtained by the probability weight calculation for each particle species (pi±, K±, p/anti-p). List of figures Figure 1 Charge distributions for pi and K in the momentum interval (470/530) MeV/c (the different distributions are explained in the text) Figure 2 Charge distributions for K and protons in the momentum interval (830/930) MeV/c (the different distributions are described in the text) Figure 3 Energy loss - momentum scatter plot for four silicon layers of ALICE ITS and for different particles (e, pi, K, p) Figure 4 Momentum distributions for pi±(a), K±(b), protons (c and d for cut-1 and cut-2, see text). Solid lines - generated distributions, dashed line - obtained after ITS simulation and PID procedure (see text), dotted lines - contamination (see text) </A
Simulation dE/dx analysis results for silicon inner tracking system of ALICE set-up at LHC accelerator
No full textThe particle identification by using dE/dx analysis in the ALICE silicon inner tracking system (ITS) was studied by simulations. Correction procedures were considered and used to improve charge collection and resolution. Particle identification efficiencies and contamination rates depending on the function of momentum were obtained by the probability weight calculation for each particle species ( pi /sup +or-/, K/sup +or-/, p square root p). The investigation has been performed at the laboratory of high energies, JINR. (6 refs)
SEARCH FOR THE t AND b-prime QUARKS IN HADRONIC DECAYS OF THE Z0 BOSON
No full textWe present a search for the third generation up type quark t and a possible fourth down type quark b' in hadronic Z0 decays observed in DELPHI at the LEP collider. For any scenario with a decay through the charged current or into a charged Higgs with a mass at least 6 GeV/c2 below the t and 3 GeVc2 below the b' mass, we set a lower limit for the t quark mass at 44.0 GeV/c2 and for the b' mass at 44.5 GeV/c2. For specific scenarios the mass limits are slightly higher, e.g. for charged current decays the limits are 44.5 and 45.0 GeV/c2 respectively, where all limits are given at a 95% confidence level. © 1990.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Study of influence of particle identification in ALICE detectors and resonance decays on correlation functions
No full textThe information about dynamics of the collective expansion of the source created in heavy ion collisions can be extracted by using intensity interferometry in different regions of rapidity and transverse momentum (p/sub 1/). The study of different factors affecting the p/sub 1/-dependence of the radii and the strength of the correlation is necessary and that is why we have studied the influence of the particle identification efficiency and the presence of the pions from resonance decays on ( pi /sup +/, pi /sup +/) correlation function measured by ALICE experiment
Mini black holes at the LHC : discovery through di-jet suppression, mono-jet emission and a supersonic boom in the quark-gluon plasma in ALICE, ATLAS and CMS
No full textWe examine experimental signatures of TeV-mass black hole formation in heavy ion collisions at the LHC. We find that the black hole production results in a complete disappearance of all very high p_T (> 500 GeV) back-to-back correlated di-jets of total mass M > M_f ~ 1 TeV. We show that the subsequent Hawking-decay produces multiple hard mono-jets and discuss their detection. We study the possibility of cold black hole remnant (BHR) formation of mass ~ M_f and the experimental distinguishability of scenarios with BHRs and those with complete black hole decay. Finally we point out that a Heckler-Kapusta-Hawking plasma may form from the emitted mono-jets. In this context we present new simulation data of Mach shocks and of the evolution of initial conditions until the freeze-out
- …
