Quark-Antiquark Energy Density Function applied to Di-Gauge Boson Production at the LHC

In view of the start up of the 14 TeV pp Large Hadron Collider the quark anti-quark reactions leading to the final states W^+W^-, W^+-Z^0 and Z^0Z^0 are studied, in the frame workn of the Standard Model (SM), using helicity amplitudes. The differential and total cross sections are first evaluated in the parton-parton center of mass system. They are then transformed to their expected behavior in pp collisions through the parton-parton Energy Density Functions which are here derived from the known Parton Density Functions of the proton. In particular the single and joint longitudinal polarizations of the final state di-bosons are calculated. The effect on these reactions from the presence of s-channel heavy vector bosons, like the W' and Z', are evaluated to explore the possibility to utilize the gauge boson pair production as a probe for these 'Beyond the SM' phenomena.Comment: 15 pages and 8 figures

On the role of the time scale Delta t in Bose-Einstein correlations

The time scale $\Delta t$ parameter, which appears in the Bose-Einstein Correlations (BEC) treated in term of the Heisenberg uncertainty relations, is reexamined. Arguments are given for the role of $\Delta t$ as a measure of the particles' emission time rather than representing the strength property of the correlated particles. Thus in the analyzes of the $Z^0$ hadronic the $\Delta t$ given value of ~$10^{-24}$ seconds is the particles' emission time prescribed by the $Z^0$ lifetime. In heavy ion collisions $\Delta t$ measures the emission time duration of the particles produced from a nucleus of atomic number $A$ which is here shown to be equal to \Delta t =(m_{\pi}a^2)/(\hbar c^2})*A^{2/3} where a is about 1 fm, that is, proportional to the nucleus surface area. This dependence agrees rather well with the experimental $\Delta t$ values deduced from the BEC analyzes of heavy ion collisions.Comment: 8 pages, 5 figure

Precision measurement of νμ\nu_{\mu} disappearance by T2K

T2K is a long-baseline neutrino oscillation experiment, where a muon neutrino beam is produced at the J-PARC facility and after traveling 295 km it is detected by Super-Kamiokande, a water Cherenkov detector with a 22.5 kton fiducial mass.One aim of the experiment is to precisely determine the mixing angle $\theta_{23}$ and the mass squared difference $\Delta m^2_{23}$ using a measurement of muon neutrino disappearance. The T2K accumulated dataset is $6.57\times 10^{20}$ protons on target, which is 8\% of the experimental goal. Here we present an analysis of the T2K muon neutrino disappearance data and the world’s best constraint on the value of the mixing angle $\theta_{23}$ obtained by this analysis

Properties of the reaction pp->ZZ at 14 TeV using the ATLAS detector

The Ph.D. dissertation describes results of research program focused on testing the capability of th ATLAS detector to measure production of Z gauge boson pairs in the Large Hadron Collider at the center of mass energy of 14 TeV with luminosity of up to 300/fb year