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We study a large-$p_T$ three-photon production in proton-proton collisions at the LHC. We use the leading order (LO) approximation of the parton Reggeization approach consistently merged with the next-to-leading order corrections originated…

High Energy Physics - Phenomenology · Physics 2024-02-20 Anton Karpishkov , Vladimir Saleev

We discuss diphoton semi(exclusive) production in ultraperipheral $PbPb$ collisions at energy of $\sqrt{s_{NN}}=$ 5.5 TeV (LHC). The nuclear calculations are based on equivalent photon approximation in the impact parameter space. The cross…

High Energy Physics - Phenomenology · Physics 2016-10-28 Mariola Klusek-Gawenda , Antoni Szczurek

A measurement of the top quark-antiquark pair production cross section $\sigma_{\mathrm{t\overline{t}}}$ in proton-proton collisions at a centre-of-mass energy of 13 TeV is presented. The data correspond to an integrated luminosity of 35.9…

High Energy Physics - Experiment · Physics 2019-05-02 CMS Collaboration

Measurements of normalized differential cross sections for top quark pair production are performed in the dilepton decay channels in proton-proton collisions at a center-of-mass energy of 13 TeV. The differential cross sections are measured…

High Energy Physics - Experiment · Physics 2018-01-12 Youn Jung Roh

Multiple interaction models satisfying $s$-channel unitarity predict that, in contrast to inelastic processes, factorization is violated in diffractive processes. The size of this effect can be characterized in terms of the rapidity gap…

High Energy Physics - Phenomenology · Physics 2007-05-23 F. W. Bopp , R. Engel , J. Ranft , A. Rostovtsev

The differential and total cross sections for kaon pair production in the pp->ppK+K- reaction have been measured at three beam energies of 2.65, 2.70, and 2.83 GeV using the ANKE magnetic spectrometer at the COSY-Juelich accelerator. These…

We calculate in the framework of collinear factorization the amplitude for the photoproduction of a near forward large mass diphoton at leading twist and next to leading order (NLO) in $\alpha_s$. We demonstrate the validity of…

High Energy Physics - Phenomenology · Physics 2021-12-15 Oskar Grocholski , Bernard Pire , Paweł Sznajder , Lech Szymanowski , Jakub Wagner

We present differential cross sections for Higgs boson and/or two-photon production from intermediate (virtual) Higgs boson within the formalism of $k_t$-factorization. Resulting distributions for two photons from the Higgs boson are…

High Energy Physics - Phenomenology · Physics 2015-10-14 Antoni Szczurek

Recent measurements of the diffractive deep-inelastic cross section are used to extract diffractive parton densities of the proton. These are subsequently applied in models to predict the production of jets and open charm in the final…

High Energy Physics - Experiment · Physics 2007-05-23 Pierre Van Mechelen

The cross section for exclusive heavy quark and heavy antiquark pair ($Q \bar Q$) production in peripheral ultrarelativistic heavy ion collisions is calculated for the LHC energy $\sqrt{s_{NN}}$ = 5.5 TeV. Here we consider only processes…

Nuclear Theory · Physics 2011-02-21 Mariola Klusek-Gawenda , Antoni Szczurek , Magno Machado , Valeriy Serbo

A measurement of the W$^+$W$^-$ boson pair production cross section in proton-proton collisions at $\sqrt{s} =$ 13 TeV is presented. The data used in this study are collected with the CMS detector at the CERN LHC and correspond to an…

High Energy Physics - Experiment · Physics 2020-11-18 CMS Collaboration

Fracture functions are parton distributions of an initial hadron in the presence of an almost collinear particle observed in the final state. They are important ingredients in QCD factorization for processes where a particle is produced…

High Energy Physics - Phenomenology · Physics 2020-01-08 X. P. Chai , K. B. Chen , J. P. Ma , X. B. Tong

The production of final state photons in hadronic $Z$-boson decays can be used to study the quark-to-photon fragmentation function $D_{q\to \gamma}(z,\mu_{F})$. Currently, two different observables are used at LEP to probe this function:…

High Energy Physics - Phenomenology · Physics 2007-05-23 A. Gehrmann-De Ridder

We present a phenomenological study of photon-initiated (PI) lepton production at the LHC, as implemented in the structure function (SF) approach. We provide detailed predictions for multi-differential lepton pair production, and show that…

High Energy Physics - Phenomenology · Physics 2022-01-10 L. A. Harland-Lang

We compare results of the $k_t$-factorization approach and the next-to-leading order collinear-factorization approach for photon-jet correlations in $pp$ and $p \bar p$ collisions at RHIC and Tevatron energies. We discuss correlations in…

High Energy Physics - Phenomenology · Physics 2008-11-26 Tomasz Pietrycki , Antoni Szczurek

This Letter reports a measurement of the cross section for producing pairs of central prompt isolated photons in proton-antiproton collisions at a total energy of 1.96 TeV using data corresponding to 9.5/fb integrated luminosity collected…

High Energy Physics - Experiment · Physics 2013-03-25 CDF Collaboration

The production of mesons in ultra-peripheral collisions of relativistic heavy ions is re-analyzed using a projection technique to calculate the amplitudes for the appropriate Feynman diagrams. The virtuality of the exchanged photons is…

Nuclear Theory · Physics 2011-07-19 C. A. Bertulani , F. Navarra

We propose a holographic model for dilepton production in proton-proton collisions based on the exchange of vector mesons. The holographic hard wall model is used to describe the dynamics and interactions of vector mesons and baryons. We…

High Energy Physics - Theory · Physics 2011-07-06 C. A. Ballon Bayona , Henrique Boschi-Filho , Nelson R. F. Braga

We calculate the differential cross section for real photon electroproduction off spinless hadron which sevres as a main probe of the hadrons structure via the concept of generalized parton distributions. Compared to previously available…

High Energy Physics - Phenomenology · Physics 2009-02-26 Andrei V. Belitsky , Dieter Mueller

We discuss Drell-Yan production of dileptons at high energies in forward rapidity region in a hybrid high-energy approach. This approach uses unintegrated gluon distributions in one proton and collinear quark/antiquark distributions in the…

High Energy Physics - Phenomenology · Physics 2016-04-20 Wolfgang Schäfer , Antoni Szczurek