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Coherence, multiple scattering and the interplay between soft and hard processes are discussed. These physics phenomena are essential for understanding the nuclear dependences of rapidity density and $p_T$ spectra in high-energy heavy-ion…

Nuclear Theory · Physics 2014-11-18 Xin-Nian Wang

We show that Pomeron interactions generate important corrections to the Gribov-Glauber formula, which is used to extract proton-proton cross sections from proton-air collisions at high energy. We show that these corrections are larger than…

High Energy Physics - Phenomenology · Physics 2013-12-25 E. Gotsman , E. Levin , U. Maor

We show that the onset and rise of QCD mini-jets provide the dynamical mechanism behind the appearance of a soft edge in pp collisions around ISR energies and thus such a soft edge is built in our mini-jet model with soft gluon resummation.…

High Energy Physics - Phenomenology · Physics 2015-10-02 D. A. Fagundes , A. Grau , G. Pancheri , Y. N. Srivastava , O. Shekhovtsova

We discuss the global structure of pp events at LHC with hard processes (particle production in two-parton collisions) on the basis of the transverse spatial characteristics of the partonic initial state. Studies of hard exclusive processes…

High Energy Physics - Phenomenology · Physics 2014-11-18 L. Frankfurt , M. Strikman , C. Weiss , M. Zhalov

The production of low mass dileptons and soft photons from thermalized Quark Gluon Plasma (QGP) and hadronic matter in relativistic heavy ion collisions is evaluated. A boost invariant longitudinal and cylindrically symmetric transverse…

Nuclear Theory · Physics 2016-09-08 Dipali Pal , Pradip Kumar Roy , Sourav Sarkar , Dinesh Kumar Srivastava , Bikash Sinha

Recent developments in soft hadronic interactions are reviewed. Emphasis it put on measurements of the proton structure at low x, photon structure, diffraction and exclusive processes such as vector-meson production and their interpretation…

High Energy Physics - Experiment · Physics 2007-05-23 P. Schleper

Results of the chiral quark models for the soft matrix elements involving pions and photons, relevant for high-energy processes, are reviewed. We discuss quantities related to the generalized parton distributions of the pion: the parton…

High Energy Physics - Phenomenology · Physics 2009-08-31 Wojciech Broniowski , Enrique Ruiz Arriola

We consider diffractive processes which can be measured at the LHC. Analysis of diffractive events will give unique information about the high energy asymptotics of hadron scattering. In semihard diffraction one may study the partonic…

High Energy Physics - Phenomenology · Physics 2017-08-23 M. G. Ryskin , A. D. Martin , V. A. Khoze

The two-tensor-pomeron model proposed previously to describe low $x$ DIS data is applied to real and virtual Compton scattering on a proton. The model includes two tensor pomerons, a soft and a hard one, and tensor reggeons. We include…

High Energy Physics - Phenomenology · Physics 2022-10-19 Piotr Lebiedowicz , Otto Nachtmann , Antoni Szczurek

We describe the recent developments to extend the multi-parton interaction model of underlying events in Herwig++ into the soft, non-perturbative, regime. This allows the program to describe also minimum bias collisions in which there is no…

High Energy Physics - Phenomenology · Physics 2009-05-29 Manuel Bahr , Jonathan M. Butterworth , Stefan Gieseke , Michael H. Seymour

The started LHC heavy ion program makes it possible to probe new frontiers of the high temperature Quantum Chromodynamics. It is expected that the role of hard and semi-hard particle production processes may be significant at ultra-high…

High Energy Physics - Phenomenology · Physics 2012-09-20 I. P. Lokhtin , A. V. Belyaev , L. V. Malinina , S. V. Petrushanko , E. P. Rogochaya , A. M. Snigirev

Exclusive photoproduction of all vector mesons by real and virtual photons is considered in the Soft Dipole Pomeron model. It is emphasized that being the Pomeron in this model a double Regge pole with intercept equal to one, we are led to…

High Energy Physics - Phenomenology · Physics 2007-05-23 A. Prokudin , E. Martynov , E. Predazzi

We examine present data for double parton scattering at LHC and discuss their energy dependence from its earliest measurements at the ISR. Different models for the effective cross-section are considered and their behavior studied for a…

High Energy Physics - Phenomenology · Physics 2019-11-18 Giulia Pancheri , Agnes Grau , Simone Pacetti , Yogendra N. Srivastava

The QCD improved parton model is a very successful concept to treat processes in hadronic interactions, whenever large partonic transverse momenta are involved. However, cross sections diverge in the limit p_T -> 0, and the usual treatment…

High Energy Physics - Phenomenology · Physics 2008-11-26 F. M. Liu , H. J. Drescher , S. Ostapchenko , T. Pierog , K. Werner

The theory part of the conference is summarized with certain emphasis on the results concerning the pomeron in soft and hard processes.

High Energy Physics - Phenomenology · Physics 2007-05-23 J. Kwiecinski

Recent $HERA$ data on the photoproduction of vector mesons are analysed within a "soft", dipole pomeron model. We argued that the data on $\sigma^{\gamma\rightarrow J/\psi}_{el}$ is consistent with a soft pomeron, the apparent rapid…

High Energy Physics - Phenomenology · Physics 2007-05-23 L. L. Jenkovszky , E. S. Martynov , F. Paccanoni

Multiple partonic interactions are widely used to simulate the hadronic final state in high energy hadronic collisions, and successfully describe many features of the data. It is important to make maximum use of the available physical…

High Energy Physics - Phenomenology · Physics 2009-01-30 Manuel Bähr , Jonathan M. Butterworth , Michael H. Seymour

We present our first attempt to develop a model for soft interactions at high energy, based on the BFKL Pomeron and the CGC/saturation approach. We construct an eikonal-type model, whose opacity is determined by the exchange of the dressed…

High Energy Physics - Phenomenology · Physics 2015-06-22 E. Gotsman , E. Levin , U. Maor

I discuss the theoretical status of the `soft' pomeron and its place in describing generic diffractive processes. The role of perturbative QCD (pQCD) corrections is considered, in particular in the context of quasi-elastic vector meson…

High Energy Physics - Phenomenology · Physics 2007-05-23 J. R. Forshaw

The low energy $J/\psi$ photoproduction cross-section has been studied on the basis of the Pomeron model. To incorporate the discrepancy between experimental data and the predictionns by the conventional models, i.e. the sum of the soft…

High Energy Physics - Phenomenology · Physics 2009-10-31 D. Roy , T. Morii , H. Toki , A. Titov
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