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Alessandro Papa (U. of Calabria & INFN Cosenza), Christophe Royon (The University of Kansas)27/08/2018, 09:00
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Valentina Avati (AGH University of Science and Technology (PL))27/08/2018, 09:10
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Alessia Bruni (U. of Bologna and INFN)27/08/2018, 09:30
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Wlodek Guryn (Brookhaven National Laboratory)27/08/2018, 09:50
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István Szanyi (Uzhgorod National University)27/08/2018, 10:10
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Laszlo Jenkovszky (National Academy of Sciences of Ukraine)27/08/2018, 11:00
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Oleg Selyugin (JINR)27/08/2018, 11:20
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Dr Michal Krelina (Universidad Técnica Federico Santa María)27/08/2018, 11:40
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Sercan Sen (Istanbul Technical University (TR))27/08/2018, 12:00
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Alan Martin, Boris Kopeliovich (UTFSM), Christina Mesropian (Rockefeller University (US)), Valentina Avati (AGH University of Science and Technology (PL))27/08/2018, 12:20
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Giuseppe Callea (University of Glasgow (GB))27/08/2018, 14:30
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Andrei Minaenko (Institute for High Energy Physics (RU))27/08/2018, 14:50
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Victor Fadin (Budker Institute of Nuclear Physics)27/08/2018, 15:10
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Jochen Bartels27/08/2018, 15:30
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Francesco Giovanni Celiberto (Università della Calabria and INFN Cosenza (Italy)), Francesco Giovanni Celiberto (IFT UAM-CSIC, Madrid)27/08/2018, 16:20
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Tamas Csorgo (Hungarian Academy of Sciences (HU))27/08/2018, 16:40
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timothy raben (University of Kansas)27/08/2018, 17:00
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Jan Cepila (Czech Technical University)27/08/2018, 17:20
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Dmitri Ivanov (University of Utah), Dmitry Ivanov, Victor Goncalves (Universidade Federal de Pelotas), Victor Gonçalves (Universidade Federal de Pelotas), timothy raben (University of Kansas)27/08/2018, 17:40
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27/08/2018, 18:10
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Ada Solano (U. of Torino and INFN)28/08/2018, 09:00
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Ksenia Shchelina (Universita e INFN Torino (IT))28/08/2018, 09:20
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Rainer Schicker (Ruprecht Karls Universitaet Heidelberg)28/08/2018, 09:40
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Cristian Baldenegro Barrera (The University of Kansas)28/08/2018, 10:00
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Christophe Royon (The University of Kansas)28/08/2018, 10:50
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Lucian Harland-Lang (University of Oxford)28/08/2018, 11:10
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Rafal Sikora (AGH University of Science and Technology)28/08/2018, 11:30
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Maria Beatriz De Leone Gay (Universidade Federál Do Rio Grande Do Sul (BR))28/08/2018, 11:50
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Alan Martin, Boris Kopeliovich (UTFSM), Christina Mesropian (Rockefeller University (US)), Valentina Avati (AGH University of Science and Technology (PL))28/08/2018, 12:10
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Ada Solano (U. of Torino and INFN)28/08/2018, 14:30
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Alessia Bruni (U. of Bologna and INFN)28/08/2018, 14:50
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Marta Ruspa (U. of Torino and INFN)28/08/2018, 15:10
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Sergey Levonian (Desy)28/08/2018, 15:30
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Krzysztof Golec-Biernat (Institute of Nuclear Physics, Cracow)28/08/2018, 16:20
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Stephane Munier (Ecole polytechnique)28/08/2018, 16:40
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Bogdan Povh (MPIK Heidelberg)28/08/2018, 17:00
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JH Lee28/08/2018, 17:20
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Abhay Deshpande (Stony Brook University), Jochen Bartels, Marta Ruspa (U. of Torino and INFN)28/08/2018, 17:40
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Matt Posik, matt posik29/08/2018, 09:00
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Yuji Goto (RIKEN)29/08/2018, 09:25
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Riccardo Longo (Univ. Illinois at Urbana Champaign (US))29/08/2018, 09:40
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Serguei Baranov (Joint Inst. for Nuclear Research (RU)), Serguei Baranov (Russian Academy of Sciences)29/08/2018, 10:05
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Pieter Maria Taels (INFN Pavia)29/08/2018, 10:50
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Daniel Gutiérrez Reyes (Complutense University of Madrid)29/08/2018, 11:15
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Samuel Wallon29/08/2018, 11:35
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Kyriakos Hadjiyiannakou (The Cyprus Institute)29/08/2018, 11:55
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Dr Ernst Sichtermann (Lawrence Berkeley National Laboratory)29/08/2018, 12:15
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Barbara Badelek (University of Warsaw (PL)), Umberto D'Alesio (University of Cagliari)29/08/2018, 12:35
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Uri Karshon (Weizmann.Institute of Science)30/08/2018, 09:00
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Lucian Harland-Lang (University of Oxford)30/08/2018, 09:20
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Claire Gwenlan (University of Oxford (GB))30/08/2018, 09:40
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Amanda Sarkar (U. of Oxford), amanda sarkar30/08/2018, 10:00
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Marco Bonvini (INFN Rome)30/08/2018, 10:50
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Claire Gwenlan (University of Oxford (GB))30/08/2018, 11:10
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Amanda Sarkar (U. of Oxford)30/08/2018, 11:30
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Cristian Baldenegro Barrera (The University of Kansas)30/08/2018, 11:50
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Amanda Sarkar (U. of Oxford), Lech Szymanowski, Paolo Gunnellini (University of Hamburg)30/08/2018, 12:10
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Maria Vittoria Garzelli (INFN, Italia & Universidad de Granada, Espana)30/08/2018, 14:30
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Andrèe Dafne Bolognino (U. of Calabria & INFN Cosenza)30/08/2018, 14:50
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Krzysztof Golec-Biernat (Institute of Nuclear Physics, Cracow)30/08/2018, 15:10
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Federico Deganutti, Mr Federico Deganutti (University of Kansas)30/08/2018, 15:30
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30/08/2018, 16:20
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Yair Mulian30/08/2018, 16:50
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Leszek Motyka30/08/2018, 17:10
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Marcin Kucharczyk (Polish Academy of Sciences (PL))30/08/2018, 17:30
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Victor Goncalves (Universidade Federal de Pelotas), Victor Gonçalves (Universidade Federal de Pelotas)30/08/2018, 17:50
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Felipe Gregoletto Ben (Universidade Federal do Rio Grande do Sul (UFRGS))30/08/2018, 18:10
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Rabah Abdul Khalek (Laboratoire de l'Accelerateur Lineaire (FR))31/08/2018, 09:00
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Cong Geng (University of Michigan (US))31/08/2018, 09:20
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Aleksandr Bylinkin (The University of Kansas (US))31/08/2018, 09:40
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Murilo Santana Rangel (Federal University of of Rio de Janeiro (BR))31/08/2018, 10:00
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Anton Godizov (Institute for High Energy Physics (Protvino)), Anton Godizov (Institute for High Energy Physics (RU))31/08/2018, 10:50
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Matti Mikael Mieskolainen (Helsinki Institute of Physics (HIP))31/08/2018, 11:10
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Valery Khoze (University of Durham (GB))31/08/2018, 11:30
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Mirzayusuf Musakhanov (National University of Uzbekistan)31/08/2018, 11:50
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Alan Martin, Boris Kopeliovich (UTFSM), Christina Mesropian (Rockefeller University (US)), Valentina Avati (AGH University of Science and Technology (PL))31/08/2018, 12:10
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Dmitri Ivanov (University of Utah)31/08/2018, 14:30
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Boris Kopeliovich (UTFSM)31/08/2018, 14:50
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Bram Verbeek (UCLouvain)31/08/2018, 15:10
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Stephane Munier (Ecole polytechnique), Stephane Munier, Stephane Munier (Ecole polytechnique), Stéphane Munier (CNRS and École polytechnique)31/08/2018, 15:30
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Tomasz Stebel (Institute of Nuclear Physics PAN), Tomasz Stebel (CERN)31/08/2018, 16:20
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Ivan Schmidt31/08/2018, 16:40
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André Giannini31/08/2018, 17:00
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Boris Ermolaev (Ioffe Institute (RU))31/08/2018, 17:20
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31/08/2018, 17:40
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Albert Bursche (Universita e INFN, Cagliari (IT))01/09/2018, 09:20
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Michael Murray (The University of Kansas (US))01/09/2018, 09:40
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Sergey Evdokimov (Institute for High Energy Physics (RU))01/09/2018, 10:00
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Jan Nemchik (Czech Technical University Prague and IEP)01/09/2018, 10:50
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Lukasz Tycjan Fulek (AGH University of Science and Technology)01/09/2018, 11:10
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Alan Martin, Boris Kopeliovich (UTFSM), Christina Mesropian (Rockefeller University (US)), Valentina Avati (AGH University of Science and Technology (PL))01/09/2018, 11:30
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Alessandro Papa (U. of Calabria & INFN Cosenza), Christophe Royon (The University of Kansas)01/09/2018, 12:10
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QCD and parton saturation physics
A model based on CGC/Saturation approach and the BFKL Pomeron was originally constructed to describe soft hadronic interactions at LHC energies [reference (a)]. It has now been extended to also describe hard interactions at HERA energies [reference (b)]. The model also describes inclusive production, rapidity and angular correlations over a wide range of energies. We outline the formalism and...
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Errol Gotsman (Tel Aviv University)
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QCD and parton saturation physics
We present a new, model independent method that describes the differential cross-section of elastic pp scattering at LHC energies in a statistically acceptable manner. The results allow for a model independent determination of the momentum-transfer dependence of the slope parameter B(t) and the rho parameter rho(t), as well as for a new, non-perturbative determination of the anomalous dimension of QCD.
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
New analysis and synthesis approaches are introduced for high energy diffraction, especially for central exclusive processes at the LHC. The synthesis features include differential screening, an expendable set of process amplitudes with adaptive Monte Carlo sampling, spin systematics and a generator framework using modern computational techniques. For the analysis of inclusive events, a...
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A novel way of computing high-order amplitudes in the multi-Regge limit of planar maximally supersymmetric Yang-Mills theory is presented. In this framework, we are able to obtain high-loop and high-leg results by an easy operation on known lower-loop and lower-leg amplitudes. This mechanism will be reviewed, along with an ensuing factorisation which allows us to determine leading logarithmic...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
We will describe the results on quartic anomalous coupling between photons, W, Z bosons at the LHC.
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Diffraction in e-p and e-A collisions
b production via a double muon tag
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The installation of scintillating pad detectors (Herschel), bracketing the LHCb detector along the beamline, have significantly enhanced LHCb's sensitivity to central exclusive production. Additionally, dedicated triggers during the early measurement period of Run 2 have produced an extended CEP dataset. A summary of results from Run 1 as well as early results from Run 2 will be shown.
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
We discuss the prospects of searches for pair production
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at the LHC with forward proton detectors
of new BSM states with subsequent decays into cosmologically
stable dark matter.
As a topical example we consider production of slepton and chargino pairs
in the MSSM with compressed mass spectra, where the natural candidate for cold dark matter is
the lightest neutralino.
Special attention is... -
Diffraction and photon physics in hadron-hadron and heavy-ion collisions
We discuss the prospects of searches for pair production
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at the LHC with forward proton detectors
of new BSM states with subsequent decays into cosmologically
stable dark matter.
As a topical example we consider production of slepton and chargino pairs
in the MSSM with compressed mass spectra, where the natural candidate for cold dark matter is
the lightest neutralino.
Special attention... -
Diffraction in e-p and e-A collisions
Collective effects in DIS at HERA
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Low-x, PDFs and hadronic final state
Measurements of open charm and beauty production cross sections in deep inelastic $ep$ scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections are obtained in the kinematic range of negative four-momentum transfer squared of the photon $2.5$~GeV$^2\le Q^2 \le 2000$ GeV$^2$ and Bjorken scaling variable $3 \cdot 10^{-5} \le x_{\rm Bj} \le 5 \cdot 10^{-2}$. The...
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Low-x, PDFs and hadronic final state
Parton distribution functions (PDFs) are crucial ingredients for measurements at hadron colliders, since they describe the initial states and therefore critically impact the precision of cross section predictions for observables. This talk will review recent precision analyses, where the PDFs play an important role and discuss the impact of several new ATLAS cross-section measurements on PDFs...
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QCD and parton saturation physics
In hadron collisions, and especially heavy ion collisions, the parton density grows as a function of center of mass energy. At large center of mass energy, when relatively small transverse momentum is involved, this first leads to the perturbative resummation of large logarithms. The dominant contribution to this evolution is the BFKL Pomeron. As the center of mass energy continues to...
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QCD and parton saturation physics
Data on diffractive dijet production reveal a dramatic failure
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of predictions based on diffractive factorization. The main source of
factorization breaking is a principal difference between the mechanisms of diagonal diffraction in DIS and off-diagonal diffractive hadronic collisions. Single-diffractive excitation of two high-pT back-to-back jets is calculated within the dipole approach. The... -
Diffraction in e-p and e-A collisions
We point out an analogy between diffractive electron-nucleus scattering events, and realizations of one-dimensional branching random walks selected according to the height of the genealogical tree of the particles near their boundaries. This correspondence is made transparent in an event-by-event picture of diffraction emphasizing the statistical properties of gluon evolution, from which new...
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Diffraction in e-p and e-A collisions
Possible diffractive PDFs measurements at the LHeC will be presented.
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We investigate the single spin asymmetry, $A_N(t)$, arising from Coulomb-nuclear interference (CNI) in small-angle elastic scattering. Previous theoretical predictions failed to explain the nontrivial $t$-dependence of $A_N$ in elastic proton-gold scattering, measured recently at RHIC.
We found that the absorptive corrections make the Coulomb amplitude of $pA$ elastic scattering cause...
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QCD and parton saturation physics
Parton distributions in the protons colliding with multiplicity much higher than the mean value, are biased to higher parton densities, leading to enhanced effects of saturation. This and the effect of mutual boosting of the saturation scale significantly increase the gluon density at small x, and correspondingly the production rate of J/psi and pT broadening, in good accord with data.
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QCD and parton saturation physics
Working in the framework of the Color Glass Condensate effective theory of high energy QCD, we investigate the momentum space entanglement entropy of the soft gluons produced in high energy dilute-dense collisions.
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Entropy in the final state of a high energy collision arises due to decoherence of eigenstates with different energies during the time evolution after the collisions with the... -
Mirko Serino
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
A simple model based on Regge approach is proposed for description of the exclusive central production of the light tensor glueball associated with the soft Pomeron
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Regge trajectory. -
Diffraction and photon physics in hadron-hadron and heavy-ion collisions
At the LHC, the highly boosted electromagnetic field of the beam particles represents a source of quasi-real photon. Vector meson photo-production measurements in Pb-Pb collisions are sensitive to the gluon parton distribution functions in the nucleus. LHCb results on charmonium production in ultra-peripheral Pb-Pb collisions at 5.02 TeV will be presented.
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Diffraction in e-p and e-A collisions
Exclusive production of four charged pions at the ep collider HERA is studied at small photon virtualities $Q^2<2$ GeV$^{2}$. The data were taken with the H1 detector in the years 2006 and 2007 at a centre-of-mass energy of $\sqrt{s}=319$ GeV and correspond to an integrated luminosity of 7.6 pb$^{−1}$. The cross section of the reaction $\gamma p\to 2(\pi^{+}\pi^{-})Y$ is determined in the...
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Diffraction in e-p and e-A collisions
Exclusive photoproduction of $\rho(770)$ vector mesons is studied using the H1 detector at HERA. A sample of about 700000 decays $\rho\to\pi^{+}\pi^{−}$ was collected in the years 2006-2007, using the H1 fast track trigger. It corresponds to an integrated luminosity of 1.3 pb${}^{−1}$. The sample is used to study cross-sections as a function of the invariant mass $m_{\pi\pi}$ of the decay...
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We present NLO calculation of the virtual photon to light vector meson impact factor in the QCD shock wave approach. This paves the way to the quantitative study of high-energy nucleon and nucleus saturation beyond the leading order.
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Diffraction in e-p and e-A collisions
Fits to high-x data and measurement of charm production in charged current
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QCD and parton saturation physics
We propose to review the main features of event-by-event gluon number fluctuations in the Fock states of onia (as models for dilute hadrons), as well as their observable consequences. We show that these fluctuations are quite different in nature depending on the very process, and on the energy range considered.
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Low-x, PDFs and hadronic final state
We propose a new process which probes the BFKL dynamics in the high energy proton-proton scattering, namely the forward Drell-Yan production accompanied by a forward jet, separated from the DY lepton pair by a large rapidity interval.
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The ALICE experiment is equipped with a broad range of
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detectors which allows one to study photon-induced and diffractive
processes characterized by large rapidity gaps. The forward detectors of
ALICE are used to detect rapidity gaps and to trigger on diffraction
events. Special attention is given to double gap events, dominated by
central-exclusive processes, because of the... -
I report on a project which aims at understanding the connection between
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pQCD and the soft Pomeron. Recent new results include the formulation of
the BFKL Pomeron in the framework of the
Exact Renormalization Group, as well as and numerical results on the
energy spectrum of the BFKL equation with an infrared cutoff. -
11. GKG18 diffractive parton distribution functions and their uncertainties in the xFitter frameworkDiffraction in e-p and e-A collisions
In this talk, we review the current status of global analyses in QCD of diffractive parton distribution functions (diffractive PDFs) and their uncertainties, focusing on very recent diffractive PDFs analysis of {\tt GKG18-DPDFs}, which is the first diffractive PDFs extracted from high-precision data from H1/ZEUS combined inclusive diffractive cross sections measurements. {\tt GKG18-DPDFs} is...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
An excess of $J/\psi$ yield at very low transverse momentum ($p_T<0.3$ GeV/c) has been observed by the ALICE collaboration in peripheral collisions Pb-Pb at forward rapidity. It was also confirmed by the STAR collaboration in peripheral collisions Au-Au and U-U at mid-rapidity. Assuming the coherent photoproduction is the main mechanism behind this effect, the rapidity distribution and nuclear...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
Heavy quarkoinium QQ̄ states created (together with hot hadron/quark-gluon matter) in high
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energy hadron-hadron/ion-ion collisions can be used as a thermometer. This is one of the motiva-
tion to study the heavy quarks dynamics in a broad range of temperatures T . On the other hand,
not only light but also heavy quarks physics is sensitive to one of the properties of QCD vacuum
–... -
Low-x, PDFs and hadronic final state
Fits to the final combined HERA deep-inelastic scattering cross-section data within the conventional DGLAP framework of QCD have shown some tension at low x and low Q2. A resolution of this tension incorporating ln(1/x)-resummation terms into the HERAPDF fits is investigated using the xFitter program. The kinematic region where this resummation is important is delineated. Such high-energy...
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QCD and parton saturation physics
The inclusive production at the LHC of a charged light hadron and of a jet, featuring a wide separation in rapidity, is suggested as a new probe process for the investigation of the BFKL
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mechanism of resummation of energy logarithms in the QCD perturbative series. We present some predictions, tailored on the CMS and CASTOR acceptances, for the cross section averaged over the azimuthal angle... -
Low-x, PDFs and hadronic final state
Recent jet results in pA and AA collisions will be presented.
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162. KG18 diffractive parton distribution functions and their uncertainties in the xFitter frameworkHamzeh Khanpour (Babol University of Technology), Hamzeh Khanpour (Institute for Research in Fundamental Sciences (IPM), IRAN)
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
We present latest results of diffractive and exclusive measurements with the CMS experiment, such as measurements of exclusive upsilon and rho production, and studies of central exclusive production (CEP) processes. Exclusive Rho0 meson photoproduction in ultra-peripheral pPb collisions at √sNN =5.02 TeV is studied, for the first time, at the LHC with the CMS Collaboration. The cross sections...
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Low-x, PDFs and hadronic final state
The latest results within the MMHT global PDF fitting framework will be presented. Particular focus will be made on the issues related to fitting the most recent high precision LHC data, and work towards the next global PDF release. Other questions, such as the inclusion of the photon PDF within the MMHT framework and impact of theoretical uncertainties in PDF fits will be discussed.
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Low-x, PDFs and hadronic final state
The gluon content of the proton, in the high-energy regime, is embodied by the unintegrated gluon distribution (UGD), which describes the probability that a gluon can be emitted by a colliding proton, with a given longitudinal momentum fraction and transverse momentum.
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The UGD, which is formulated within the k$_{T}$-factorization approach, has universal validity and several models for it have... -
Diffraction and photon physics in hadron-hadron and heavy-ion collisions
Light-by-light scattering (γγ→γγ) is a quantum-mechanical process that is forbidden in the classical theory of electrodynamics. This reaction is accessible at the Large Hadron Collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead (Pb) ions. Using 480 μb−1 of Pb+Pb collision data recorded at a centre-of-mass energy per nucleon pair of 5.02...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The production of exclusive γγ→μ+μ− events in proton--proton collisions at a centre-of-mass energy of 13 TeV is measured with the ATLAS detector at the LHC, using data corresponding to an integrated luminosity of 3.2 fb−1. The measurement is performed for a dimuon invariant mass of 12 GeV <mμ+μ−< 70 GeV. The integrated cross-section is determined within a fiducial acceptance region of the...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
We present results of the measurement of the total and elastic cross sections in proton--proton collisions at $\sqrt s = 200$ GeV with the Roman Pot setup in Run 2015 of the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The Roman Pots were operated during standard data collection at STAR at the distance of about $8\sigma_y$ from the beam, where $\sigma_y$ is the beam gaussian...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The total pp cross section is a fundamental observable at the LHC. It can be derived from the measurement of the elastic cross section, using the optical theorem. Measurements of the elastic proton-proton cross section were performed at a center-of-mass energy of 8 TeV at various settings of the beam optics using the ALFA detector.
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The ALFA detector is also used to tag forward protons in... -
Diffraction and photon physics in hadron-hadron and heavy-ion collisions
We present the results of the diffractive measurement with the STAR Roman Pot detectors at RHIC. The measurement is focused on the spectra of identified charged particles as pions, kaons, protons and their antiparticle counterparts in Single Diffraction Dissociation $\left(p+p\to p+X\right)$ and Central Diffraction $\left(p+p\to p+X+p \right)$ processes. The spectra of inclusive charged...
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QCD and parton saturation physics
Jet substructure observables have significantly extended the search program for physics beyond the Standard Model at the Large Hadron Collider. The state-of-the-art tools have been motivated by theoretical calculations, but there has never been a direct comparison between data and calculations of jet substructure observables that are accurate beyond leading-logarithm approximation. Such...
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Low-x, PDFs and hadronic final state
Using the formalism of the light-cone wave function in perturbative QCD together with the hybrid factorization, we compute the cross-section for three particle production at forward rapidities in proton-nucleus collisions. In this picture, the three produced partons --- a quark accompanied by a gluon pair, or two quarks plus one antiquark --- are all generated via one or two successive...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
By using a Regge-pole model, including pomeron and odderon exchanges as double poles we analyze the recently discovered phenomena in elastic proton-proton scattering at the LHC: the low-|t| "break" (departure from the exponential behavior of the diffraction cone), the accelerating rise with energy of the forward slope B(s), the absence of secondary dips and bumps on the cone and the unexpected...
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Low-x, PDFs and hadronic final state
Measurements of the cross sections of the production of three electroweak gauge bosons and of vector-boson scattering processes at the LHC constitute stringent tests of the electroweak sector of the Standard Model and provide a model-independent means to search for new physics at the TeV scale. The ATLAS collaboration searched for the production of three W bosons or of a W boson and a photon...
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Low-x, PDFs and hadronic final state
We report on the latest measurement on the production of W bosons in association with jets at 8 TeV and compare our results to the latest theoretical predictions. Differential cross sections for events with one or two jets are presented for a range of observables, including jet transverse momenta and rapidities, the scalar sum of transverse momenta of the visible particles in the event, and...
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Low-x, PDFs and hadronic final state
Precision measurements of the Drell-Yan production of Z bosons at the LHC provide a benchmark of our understanding of perturbative QCD and electroweak processes and probe the proton structure in a unique way. ATLAS performed a precise triple differential Drell-Yan cross-section measurement as a function of Mll, dilepton rapidity and cosθ∗ defined in the Collins-Soper frame at a center of mass...
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The derivation of the BFKL equation based on the unitarity relations is strongly complicated in the next-to-next-to-leading logarithmic approximation. The main reason of the complification is appearence of Regge cuts in amplitudes with gluon quantum numbers in the cross channels and negative signature.
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Spin physics
We will present results on the spin and momentum decomposition among the quarks and gluons in the nucleon using state-of-the-art lattice QCD simulations.
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Techniques for the accurate evaluation of sea-quark and gluon
contributions at the physical pion mass will be discussed.
Challenges and perspectives for future developments will be presented. -
Low-x, PDFs and hadronic final state
Inclusive heavy vector meson hadroproduction is a subject of vivid experimental studies at the Large Hadron Collider. We consider in detail a new color singlet contribution to the J/psi production at the LHC, that is driven by a double BFKL pomeron exchange between the produced meson and a target parton. This production mechanism is closely related to a small x evolution of double gluon...
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QCD and parton saturation physics
Horowitz and Kovchegov have derived a $k_T$-factorization formula for
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particle production at small $x$ which includes running coupling
corrections. We perform a first numerical analysis to confront the
theory with data on the energy and centrality dependence of particle
multiplicities at midrapidity in high-energy p+A and A+A
collisions. Moreover, we point out a strikingly different... -
Low-x, PDFs and hadronic final state
Energy-frontier DIS can be realised at CERN through an energy recovery linac that would produce 60 GeV electrons to collide with the HL-LHC or later HE-LHC (LHeC) or eventually the FCC hadron beams (FCC-eh). It would deliver electron-proton collisions with centre-of-mass energies in the range 0.3-3.5 TeV, and luminosities exceeding 10^34 cm^−2s^−1. In this talk we will present new studies on...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
A study is presented to extend the measurements of photon-photon
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scattering in ultra-peripheral Pb-Pb collisions at the LHC into
the mass region of the pseudoscalar resonances eta and eta'.
The elementary photon-photon scattering cross section discussed in
Ref.1 is extended to the low masses of these pseudoscalars. The main
background to two-photon final states, arising from double... -
Spin physics
Polarization observables play prominent role in modern physics and can provide unique and crucial information on the interaction dynamics. Our present note is devoted to a theoretical analysis of the decays of $\chi_{c1}$ and $\chi_{c2}$ mesons produced in high energy hadronic collisions:
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$pp\to\chi_{cJ}+X;\; \chi_{cJ}\to J/\psi+l^+l^-;\; J/\psi\to l^+l^-.$
This study was inspired by a... -
QCD and parton saturation physics
Studies of heavy quarkonia production in the hadronic collisions are a very good tool for testing various aspects of QCD. Despite many theoretical attempts, the long-standing problem of J/psi's polarization has resisted solution. We present our recent study on the J/psi polarization observables \lambda's in a Color Glass Condensate (CGC) + Nonrelativistic QCQ (NRQCD) approach. Comparisons with...
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Spin physics
Exclusive photoproduction of a gamma-meson pair in the kinematics where the pair has a large invariant mass and the final nucleon has a small transverse momentum is described in the collinear factorization framework. The scattering amplitude is calculated at leading order in alphaS and the differential cross sections for the process are estimated in the kinematics of the JLab 12-GeV experiments.
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Spin physics
Transverse-momentum dependent parton distribution functions (TMD PDFs, or TMDs for short), are fundamental objects in QCD which describe the parton content of a proton as a function of the parton's longitudinal momentum fraction $x$ w.r.t. the proton, and its transverse momentum $k_{t}$. As such, they provide insight in the three-dimensional structure of the proton in terms of quarks and...
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QCD and parton saturation physics
Perturbative QCD calculations at next-to-leading order are available for the jet production in pp collisions since several years and next-to-next-to leading order calculations also became available recently. In this talk, we present the latest results from the ATLAS collaboration for inclusive jets and dijets, measured at center of mass energies of 8 and 13 TeV. All measured cross-sections are...
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Low-x, PDFs and hadronic final state
The PROSA parton distribution function fit was the first one appeared
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in the literature incorporating data on open charm and open bottom
hadroproduction at LHCb, in order to reduce the uncertainties on gluons
and sea quarks at low x's (x < 10^-4).
We will present recent developments of the PROSA PDFs, of particular
relevance for their usage in the field of Neutrino Astronomy, and... -
Diffraction in e-p and e-A collisions
So far the analysis of the polarized structure functions have been limited to
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the evaluation of their integrals and comparing them to the prediction of the
static quark model of the nucleon given by Ellis and Jaffe. We extended our analysis
to the x dependence of the polarized structure functions and observe:
the measured structure function excellently agrees with the prediction of the... -
Low-x, PDFs and hadronic final state
In the present paper, the ATLAS inclusive W and Z boson production data
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are analysed together with the CMS inclusive W and Zboson production
data to investigate any possible tensions between the data sets and to determine
the strange sea fraction, within the framework of a parton distribution function
fit at next-to-next-to leading order in perturbative QCD. -
Diffraction and photon physics in hadron-hadron and heavy-ion collisions
We discuss production of $W^+ W^-$ pairs in proton-proton collisions induced by two-photon fusion including, for a first time, transverse momenta of incoming photons. The unintegrated inelastic fluxes (related to proton dissociation) of photons are calculated based on modern parametrizations of deep inelastic structure functions in a broad range of their arguments ($x$ and $Q^2$). In our...
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Marta Luszczak (University of Rzeszow)
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Spin physics
The Relativistic Heavy Ion Collider (RHIC) is a unique facility as it is the world’s only polarizedproton + proton collider capable of delivering highly polarized protons at√s= 200/500 GeV.Using longitudinally polarized protons, RHIC is able to probe the longitudinal spin structureof the proton throughW ALandW, jet, hadron, and ...
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Low-x, PDFs and hadronic final state
We present latest results of soft and small-x QCD measurements with the CMS experiment, such as minimum bias/underlying event physics, and studies on forward jet production.
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
We present latest results of diffractive and exclusive measurements with the CMS experiment, such as inelastic cross section measurements, diffractive jet production, measurements of exclusive upsilon and rho production, and studies of central exclusive production (CEP) processes.
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Spin physics
COMPASS is a high energy physics experiment at CERN (SPS, M2 beamline). One of the main objectives of the experiment is the study of the transverse spin structure of the nucleon through measurement of target spin (in)dependent azimuthal asymmetries in semi-Inclusive Deep Inelastic Scattering and Drell-Yan processes with transversely polarized targets. Within the QCD improved parton model...
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Low-x, PDFs and hadronic final state
I will discuss recent developments in the theory of small-$x$ resummation. These include the matching of resummation to fixed NNLO (and even N$^3$LO), the construction of a variable flavour number scheme at small $x$, the resummation of the heavy-flvour matching conditions, a new formalism for the resummation of physical observables, and a variety of technical improvements. All these results...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The TOTEM experiment at the interaction point 5 of the LHC has measured the total, elastic and inelastic proton-proton cross sections in a centre-of-mass energy range from 2.76 to 13 TeV, mostly in dedicated fills with special beam optics.
Most recently, TOTEM has performed a series of detailed measurements at $\sqrt{s}$ = 13 TeV. The total, elastic and inelastic proton-proton cross-sections...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
We will describe recent results from PPS on exclusive dileptons and diphotons and prospects for future analyses.
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The STAR experiment at the Relativistic Heavy Ion Collider (RHIC) performs studies of diffractive processes with the focus on the exclusive production of particles in central range of rapidity. In 2015 STAR collected 18 pb$^{-1}$ of data in polarized proton-proton collisions at $\sqrt{s}$ = 200 GeV to measure Central Exclusive Production (CEP) process $pp\to pXp$ through Double Pomeron...
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Low-x, PDFs and hadronic final state
In this work, we discuss a universal expression for cross sections for the exclusive production of particles in scattering processes in the so-called saturation region. Within this scheme the phenomenon of geometric scaling takes place: cross sections are functions only of a dimensionless combination of the relevant kinematic variables, which happens both in inclusive and diffractive cases, as...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The existence of an axion-like particle (ALP) would induce anomalous scattering of light by light. This process can be probed at the Large Hadron Collider in central exclusive production of photon pairs in proton-proton collisions by tagging the surviving protons using proton spectrometers. We estimate the expected bounds on the ALP--photon coupling for a wide range of masses. We show that the...
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Spin physics
We installed an electro-magnetic calorimeter in the most forward area of the STAR experiment and took 510 GeV polarized proton collision data for neutral particle production (neutron, photon, neutral pion) at pseudorapidity > 6. The cross section measurement will give us new inputs to develop high-energy collision models which is essential to understand air-shower from ultra-high energy cosmic...
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Low-x, PDFs and hadronic final state
The forward acceptance of LHCb, 2.0 < y < 5.0, provides a complementary reach to the general purpose detectors on LHC for studies of minimum bias properties. Recent measurements in this area at LHCb, including measurements of bose-einstein correlations, will be presented.
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Spin physics
A high luminosity polarized Electron-Ion Collider (EIC) with high and
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variable energy will offer unique opportunities to study the spin of the
nucleon, its internal dynamics, and low-x phenomena. The nuclear science
community aims to realize such a collider in the United States as an
upgrade to either the existing Relativistic Heavy Ion Collider or the
Thomas Jefferson National Accelerator... -
Low-x, PDFs and hadronic final state
The analysis of the momentum difference between charged hadrons in high-energy proton-proton collisions is performed in order to study coherent particle production. The observed correlation pattern agrees with a model of a helical QCD string fragmenting into a chain of ground-state hadrons. A threshold momentum difference in the production of adjacent pairs of charged hadrons is observed, in...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
A new release of the SuperChic Monte Carlo event generator for central exclusive production (CEP) processes will be presented. Updates include: the addition of photon and QCD-induced production in heavy ion collisions (with a full treatment of absorptive effects); the addition of a range of new processes, such as the production of axion-like particles, electroweakly coupled SUSY states,...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The production of prompt isolated photons at hadron colliders provides a stringent test of perturbative QCD and can be used to probe the gluon density function of the proton.
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The ATLAS collaboration has performed numerous cross section measurements of prompt photon production, among which are a precise measurement of the production of isolated prompt photons in association with heavy flavor... -
Low-x, PDFs and hadronic final state
Measurements of the cross sections of the production of pairs of electroweak gauge bosons at the LHC constitute stringent tests of the electroweak sector and provide model-independent means to search for new physics at the TeV scale. Similarly, the electroweak production of vector bosons in proton-proton collisions tests the gauge structure of the Standard Model. The ATLAS collaboration has...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
Analysis of the new experimental data obtained by the TOTEM Collaborations at LHC at $\sqrt{s} = 13 $ TeV at small momentum transfer is presented in the framework of the simplest form of the hadron scattering amplitude. The impact of the different assumptions on the extraction of the parameters of the elastic scattering amplitude, especially on the size of the $\rho(t=0)$, is examined. The...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The existence of the odderon, odd C-parity counterpart of the pomeron, was never questioned seriously simply because there is no constrain (“selection rule”) forbidding its existence. We discuss open questions concerning constraints imposed on the odderon by analyticity and unitarity, explicit parameterizations as well as possible manifestation of the odderon in experiment.
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The PPS detector from CMS and TOTEM will be presented
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Low-x, PDFs and hadronic final state
In the search for a clear signal of underlying BFKL dynamics in high-energy diffractive processes the Mueller-Tang jet observables have been proven to be a particularly fortunate choice. Muellet-Tang jet precesses are dijet events with no radiation recorded in the rapidity region between the jets.
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Despite unperturbative effects that can affect the rapidity gap signature a color-singlet... -
Low-x, PDFs and hadronic final state
The QCD factorization theorems allows one to write any hard-scattering cross section involving hadrons in the initial state as a convolution between perturbative matrix elements and non-perturbative parton distributions functions (PDFs), which need to be extracted from experimental data by means of a global QCD analysis. Thanks to recent progress from both experiment and theory, the PDFs of...
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The factorization theorem for DY and semi-inclusive DIS holds for all leading twist transverse momentum distributions. However a QCD perturbative calculation shows several important characteristics of spin-dependent distributions. We consider all the different spin-dependent distributions which can be matched onto integrated twist-2 functions, focusing on the transversity and pretzelosity...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
The recent ALICE data clearly demonstrate the universality of suppression of different high-pT hadrons containing light quarks produced inclusively in heavy ion collisions at Large Hadron Collider (LHC). Moreover, the last ATLAS results on production of prompt charmonia show almost the same attenuation as is observed in production of light hadrons. This fact leads naturally to a conclusion...
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We will present a model in which we treat electro-production of light and heavy vector mesons using the color dipole approach including the quantum fluctuations of the target structure. These fluctuations are generated by hot spots, randomly placed in the transverse plane. The number of hot spots grows with decreasing Bjorken-x, which brings energy dependence of the target structure into this...
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Low-x, PDFs and hadronic final state
In this contribution I review the recent progress in description of the vector meson photoproduction in hadronic colliders. In particular, I discuss the distinct treatments for the vector meson wave function, the contribution of the next - to - leading order corrections and the different models for the dipole - target scattering amplitude. Predictions for the light and heavy photoproduction...
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Diffraction and photon physics in hadron-hadron and heavy-ion collisions
Sone new results on Psi(2S). D meson, di-photon productions from CMS will be presented.
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