Transverse Momentum and Pseudorapidity Spectrum of the Top Quark, Lepton, and b Jet in Proton-Proton Collisions at LHC

We study the transverse momentum and pseudorapidity spectrum of the top quark and their decay products, the t t ¯ system, and the total number of jets in proton-proton (pp) collisions at 13 TeV by using the Tsallis-Pareto-type function and the three-source Landau hydrodynamic model, respectively. The related parameters, such as the effective temperature of the interacting system ( T ), the nonextensivity of the process ( n ), and the width ( σ ) of pseudorapidity distribution, are extracted.

Pseudorapidity distributions of fast target protons in 32S-Em collisions at Dubna energy

In this paper, the possible mechanisms, which are responsible for the production of fast target fragments (gray particles with energy 26 up to 400[Formula: see text]MeV) that were emitted from the interactions of [Formula: see text]S nucleus with emulsion nuclei at energy 3.7[Formula: see text]A[Formula: see text]GeV, are studied by the pseudorapidity distribution. The angular distribution of the fast protons ([Formula: see text]-particles) emitted in the interactions of [Formula: see text]S-Em at 3.7[Formula: see text]A[Formula: see text]GeV is nicely described by exp (0.96 cos [Formula: see text], which was observed in proton-induced interactions up to incident energies of 800[Formula: see text]GeV. The pseudorapidity distributions of the produced [Formula: see text]-particles were investigated in order to study the characteristics of the emitted system of [Formula: see text]-particles for different target sizes (CNO, Em and AgBr groups of events). In all cases, the pseudorapidity distributions were parametrized using Gaussian fits. The temperature of the system emitting [Formula: see text]-particles (hot system) is predicated in the light of the proposed statistical model to be [Formula: see text][Formula: see text]MeV.

Transverse momentum distribution of primary charged particles in the p–Pb interactions using HIJING 1.0

The shape of the transverse momentum [Formula: see text] distribution of primary charged particles in minimum bias (nonsingle-diffractive) p–Pb collisions at [Formula: see text] is studied in the pseudorapidity regions: [Formula: see text], [Formula: see text] and [Formula: see text] and in the transverse momentum range [Formula: see text] using simulated data produced with the HIJING 1.0 code. These are compared with the ALICE data measured by the ALICE detector at the LHC. In the model, the central and forward [Formula: see text]-regions differ more than in the ALICE data and due to this fact HIJING 1.0 cannot describe well the high [Formula: see text] region in the [Formula: see text] distributions. The comparison of results from simulation implies that the HIJING 1.0 considered narrower pseudorapidity distribution for the charged particles than it is in the ALICE data. It cannot take into account satisfactorily leading effect due to the asymmetric p–Pb fragmentation.

Recent CMS results on diffraction

Recent CMS results on diffraction are presented. These include the measurements of the soft diffractive cross sections, of the forward rapidity gap cross section, of the diffractive dijet cross section, the measurement of a large rapidity gap in W and Z boson events and the measurement of the pseudorapidity distribution of charged particles in a single diffractive enhanced sample. This last measurement is the first common result of the CMS and TOTEM collaborations. Some prospects of common CMS-TOTEM data taking are also discussed.