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We investigate the production of a quark-antiquark pair in diffractive photon- proton scattering, approximating soft pomeron exchange by the exchange of two nonperturbative gluons. In deep inelastic scattering at HERA, events with two jets…

高能物理 - 唯象学 · 物理学 2011-07-19 M. Diehl

There seems to be a general consensus now that a first glimpse of a QGP-like effect has become visible in the beautiful NA50 data on J/\psi production and the `anomalous supression' phenomenon. On the other hand, it is still widely believed…

核理论 · 物理学 2009-10-31 Klaus Geiger

A new variant of the effective pomeron exchange model is proposed for the description of the correlation, observed in $pp$ and $p\bar{p}$ collisions at center-of-mass energy from SPS to LHC, between mean transverse momentum and charged…

高能物理 - 唯象学 · 物理学 2022-09-21 Evgeniia Bodnia , Denis Derkach , Grigory Feofilov , Vladimir Kovalenko , Andrey Puchkov

It is shown that even if a quark q is on the mass shell, the quark q' created via vacuum pair production in the process q -> h + q' has wide distribution for its spacelike virtuality, and so at the end of daughter string (q'\bar{q}) there…

高能物理 - 唯象学 · 物理学 2007-05-23 Vladimir Lugovoi

We investigate stopping and baryon transport in central relativistic Pb + Pb and Au + Au collisions. At energies reached at the CERN Super Proton Synchrotron [sqrt(s_NN) = 6.3-17.3 GeV] and at RHIC (62.4 GeV), we determine the…

高能物理 - 唯象学 · 物理学 2011-06-10 Yacine Mehtar-Tani , Georg Wolschin

We argue that $p_T$ distribution data from the LHC on the invariant differential yield of the charged primary particles in $pp$ collisions at $\sqrt{s}=0.9 TeV, 2.76 TeV,7TeV$ and in $Pb-Pb$ collisions at $\sqrt{s_{NN}}=2.76 TeV$ with 6…

核实验 · 物理学 2018-01-22 M. K. Suleymanov

Preliminary data from the Beam-Energy Scan II measurements by the STAR Collaboration at the Relativistic Heavy Ion Collider suggest a dip in the fourth-to-second-order cumulant ratio when plotted vs. beam energy. At the same energy range…

高能物理 - 唯象学 · 物理学 2024-07-30 Oleh Savchuk

We report the latest results on the search for the QCD critical point in the QCD phase diagram through high energy heavy-ion collisions. The measurements discussed are based on the higher moments of the net-proton multiplicity distributions…

核实验 · 物理学 2021-01-25 Bedangadas Mohanty , Nu Xu

We report on investigations concerning the production of large transverse momentum jets in DIS diffractive dissociation. These processes constitute a new class of events that allow for a clean test of perturbative QCD and of the hard…

高能物理 - 唯象学 · 物理学 2009-10-28 J. Bartels , C. Ewerz , H. Lotter , M. Wuesthoff , M. Diehl

A double-gap topology is used for filtering central-diffractive events from a proton-proton minimum-bias data sample at a centre-of-mass energy {$\sqrt{s}=7$\,TeV}. This topology is defined by particle activity in the ALICE central barrel…

高能物理 - 实验 · 物理学 2019-08-13 Felix Reidt

We argue that semi-inclusive photo-production of a pair of hard jets via coherent diffraction in nucleus-nucleus ultra-peripheral collisions at high energy is a golden channel to study gluon saturation. The dominant contribution is the…

高能物理 - 唯象学 · 物理学 2023-04-26 E. Iancu , A. H. Mueller , D. N. Triantafyllopoulos , S. Y. Wei

We argue that the collinear factorization of the fragmentation functions in high energy nuclear collisions breaks down at transverse momenta $p_T \lesssim Q_s/g$ due to high parton densities in the colliding hadrons and/or nuclei. We find…

高能物理 - 唯象学 · 物理学 2008-11-26 Yang Li

The hadron inclusive spectra in pp collisions at high energies are analyzed within a soft QCD model, namely the quark-gluon string model. In addition to the sea quark distribution in the incoming proton we consider also the unintegrated…

高能物理 - 唯象学 · 物理学 2015-03-17 V. A. Bednyakov , G. I. Lykasov , M. G. Poghosyan

A recently formulated thermal model for hadron production in heavy-ion collisions in the few-GeV energy regime is combined with the idea that some part of protons and neutrons present in the original thermal system forms deuterons via the…

Using the QCD dipole picture of the BFKL pomeron, the gluon contribution to the cross-section for single diffractive dissociation in deep-inelastic high-energy scattering is calculated. The resulting contribution to the proton diffractive…

高能物理 - 唯象学 · 物理学 2008-11-26 A. Bialas , R. Peschanski

We discuss the shape of the interaction region of the elastically scattered protons stipulated by the high-energy Pomeron exchange which turns out to be very similar with the shape of the static string representing the confining QCD flux…

高能物理 - 唯象学 · 物理学 2015-05-18 V. A. Petrov , R. A. Ryutin

I discuss a number of novel phenomenological features of QCD in high transverse momentum reactions. The presence of direct higher-twist processes, where a proton is produced directly in the hard subprocess, can explain the "baryon anomaly"…

高能物理 - 唯象学 · 物理学 2010-12-17 Stanley J. Brodsky

The excitation of the proton into undetected multiparticle states (double diffraction dissociation) is an important background to single diffractive deep-inelastic processes $ep \rightarrow e'p'\rho^{0}, ~e'p'J/\Psi, ~e'p'X$ at HERA. We…

高能物理 - 唯象学 · 物理学 2007-05-23 H. Holtmann , N. N. Nikolaev , A. Szczurek , J. Speth , B. G. Zakharov

In this work, $\gamma^{(\ast)}\gamma^{(\ast)}$ interactions in electron-positron collisions are studied across both low- and high-energy regimes. The analysis includes contributions from the Vector Meson Dominance (VMD) model (via Reggeon…

高能物理 - 唯象学 · 物理学 2025-09-01 G. Zardo Becker

In this paper, the spin transfer torque (STT) and the exchange coupling of the Josephson junctions containing interesting cases of diffusive/ballistic-triplet/singlet ferromagnetic superconductor materials together with diffusive Josephson…

介观与纳米尺度物理 · 物理学 2019-07-16 Zahra Shomali , Reza Asgari