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Matyja A.,Henryk Niewodniczanski Institute of Nuclear Physics PAN
Acta Physica Polonica B | Year: 2014

We present selected results devoted to the global properties of dense matter produced in the Pb-Pb collisions at √sNN = 2:76 TeV measured by the ALICE Collaboration. Several first results on p-Pb collisions at p sNN = 5:02 TeV related to the double ridge structure, identified transverse momentum particle spectra and baryon-to-meson ratio are briefly reviewed. Nuclear modification factor for charged hadrons, identified light and heavy flavors are discussed together with the studies on reconstructed jets. Source


Zabinski B.,Henryk Niewodniczanski Institute of Nuclear Physics PAN
Acta Physica Polonica B | Year: 2014

This note describes ATLAS results on multiplicity of produced charged particles in p+Pb collisions at the centre-of-mass energy of 5.02 TeV. The charged particle density was measured in a wide pseudorapidity range as a function of the collision centrality using 2.1 million events which were collected during a "pilot run" in September 2012. Analysis methods, centrality determination and the particle production dependence on the number of nucleons participating in the collisions are presented. Source


Rachwal B.,Henryk Niewodniczanski Institute of Nuclear Physics PAN
Acta Physica Polonica B | Year: 2014

Lepton number is conserved in the Standard Model, therefore, any evidence for its violation would indicate the existence of New Physics models. This paper presents selected searches of rare decays performed by the LHCb experiment. An update for the studies dedicated to on-shell Majorana neutrinos coupling to muons in the B- → π +μ -μ - decay channel is also presented. Source


Malecki P.,Henryk Niewodniczanski Institute of Nuclear Physics PAN
Acta Physica Polonica B | Year: 2014

This article presents recent results obtained by the ATLAS experiment at the Large Hadron Collider (LHC) regarding the measurements of Standard Model and Flavor Physics phenomena performed with data collected in proton-proton collisions at center-of-mass energies √ s = 7 TeV and 8 TeV. Presented results include measurements of W and Z boson properties as well as selected QCD phenomena. Finally, a selection of results from the B-physics sector is shown. Source


Lewandowska E.,Henryk Niewodniczanski Institute of Nuclear Physics PAN
Acta Physica Polonica B | Year: 2014

Double parton distribution functions (DPDFs) are used in the description of double parton scattering. Their QCD evolution equations, known in the leading logarithmic approximation, obey non-trivial momentum and valence quark number sum rules. In this paper, we discuss the QCD evolution of the DPDFs, in particular, the specification of initial conditions for the evolution equations which obey the new momentum sum rules. We also present results on factorization of DPDFs on the product of two single parton distributions. Source

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