We use a two-function interplay model parametrization to describe data of the pp cross-section by the increase of matter density to the black disk saturation limit and the radial expansion through the growth of the overlap area based on a geometric scaling model. We argue two mechanisms responsible for the growth of high energy cross-sections in pp collisions by using data on different species...
In 2018, LHCb recorded $\sim 210 \mu b^{-1}$ integrated luminosity of PbPb
collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. With an increase of the luminosity by a
factor 20 compared to the previous 2015 PbPb dataset, precise measurements on
photo-produced charmonia in ultra-peripheral collisions are foreseen. Moreover,
the great momentum resolution of the detector allows to study...
Magnetic and electric dipole moments of fundamental particles provide powerful probes for physics within and beyond the Standard Model. For the case of short-lived particles these have not been experimentally accessible to date due to the difficulties imposed by their short lifetimes. A unique program of direct measurements of electromagnetic dipole moments of strange and charm baryons, and...
We discuss the role of additional hadron-hadron interactions in elastic photon-initiated production at the LHC, both in proton and heavy ion collisions. We in particular assess different sources of uncertainty associated with these cross sections, and compare with other calculations in the literature. A key result of our analysis is that the uncertainty associated with the survival factor is...
We review a number of coherent phenomena which are studied in the ultraperipheral collisions (UPC) at the LHC. In particular, we demonstrate that much larger shadowing for coherent rho-meson production than in the Glauber model naturally emerges in the color fluctuation picture of high energy hadron – nucleon interaction. We also demonstrate that the theory of the leading twist gluon...
Diffractive processes possible to be measured at the LHC will be briefly discussed. This includes soft (elastic scattering, exclusive meson pair production, diffractive bremsstrahlung) and hard (single and double Pomeron exchange jets, γ+jet, W/Z, jet-gap-jet, exclusive jets) processes as well as Beyond Standard Model phenomena (anomalous gauge couplings, magnetic monopoles).
Feasibility...
We present recent BFKL phenomenological results for the inclusive production of a Higgs in association with a jet, as a testfield for the semi-hard regime of QCD. We show how the large energy scales provided by the emission of a Higgs boson stabilize the BFKL series, and discuss the possible extension of this work in the full NLA BFKL analysis, by including the NLO jet impact factor, with a...
High multiplicity events in small collision systems ($pp$ and $pA$ collisions) at hadron colliders have received much attention in recent years. In this talk we will present analysis of $J/\psi$ polarization in high multiplicity hadron collisions using the CGC+NRQCD framework. Predictions both for $pp$ and $pA$ at LHC energies will be presented.
I would like to present recently obtained results for distribution of soft gluons that are produced by hard jet propagating through quark gluon plasma.
The results are based on the papers:
https://link.springer.com/article/10.1007/JHEP04(2021)014
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.102.044910
Jet production is an important probe of both QCD and new physics. Recent CMS measurements involving jet production are presented. In particular, the CMS 13 TeV inclusive jet data are used in a QCD analysis together with HERA inclusive deep inelastic scattering and CMS 13 TeV triple-differential top quark-antiquark pair production cross sections. The parton distributions and the strong coupling...
Simone Ragoni$^1$, on behalf of the ALICE Collaboration
$^1$ University of Birmingham, Birmingham, B15 2TT, UK
simone.ragoni@cern.ch
Ultra-peripheral collisions (UPC) are events characterised by large impact parameters between the two projectiles, larger than the sum of their radii. As a consequence, the protons and ions accelerated by the LHC are beyond the reach of the strong...
Recent research by CERN has revealed machine learning-driven capabilities for the identification of proton-proton collisions at LHC for reanalysis. While this work and other previous works also work on speeding up inference via the machine learning algorithm, in this work we propose harnessing Hadamard matrices for faster inference at the model level. Machine learning algorithms for...
The goal of LHCspin is to develop, in the next few years, innovative solutions and cutting-edge technologies to access spin physics in high-energy polarized fixed-target collisions, by exploring a unique kinematic regime given by the LHC beam and by exploiting new probes.
This ambitious task poses its basis on the recent installation of SMOG2, the unpolarized gas target in front of the LHCb...
