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Differential and double-differential cross sections for the production of top quark pairs in proton-proton collisions at $\sqrt{s} =$ 13 TeV are measured as a function of kinematic variables of the top quarks and the top quark-antiquark…

High Energy Physics - Experiment · Physics 2018-06-20 CMS Collaboration

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 calculate three jet cross sections in photoproduction using exact matrix elements for the direct and resolved contributions. Numerical distributions are presented in a generic, irreducible set of variables that allows to disentangle the…

High Energy Physics - Phenomenology · Physics 2014-11-17 Michael Klasen

Massless quark and antiquark jet production at large transverse momentum in the coherent diffractive processes at hadron colliders is calculated in the two-gluon exchange parametrization of the Pomeron model. We use the helicity amplitude…

High Energy Physics - Phenomenology · Physics 2007-05-23 Feng Yuan , Kuang-Ta Chao

In a suitably chosen back-to-back kinematics, four-jet production in hadronic collisions is known to be dominated by contributions from two independent partonic scattering processes, thus giving experimental access to the structure of…

High Energy Physics - Phenomenology · Physics 2015-06-11 Boris Blok , Mark Strikman , Urs Achim Wiedemann

We discuss calculations of the inclusive total cross section for heavy quark production at hadron collider energies within the context of perturbative quantum chromodynamics, including resummation of the effects of initial-state soft gluon…

High Energy Physics - Phenomenology · Physics 2009-10-30 Edmond L. Berger , Harry Contopanagos

This article reports a measurement of the production cross section of prompt isolated photon pairs in proton-antiproton collisions at \sqrt{s} = 1.96 TeV using the CDF II detector at the Fermilab Tevatron collider. The data correspond to an…

High Energy Physics - Experiment · Physics 2011-10-06 CDF Collaboration , T. Aaltonen

We argue that a hidden-charm pentaquark recently observed in weak decays of $\Lambda_{b}$ can be produced in proton-nucleus collisions without electroweak intermediaries. We analyze the production cross-section for several scenarios of…

High Energy Physics - Phenomenology · Physics 2016-05-11 Ivan Schmidt , M. Siddikov

Measured multiplicity distributions of primary charged particles produced in the forward rapidity region of the $proton-proton$ ($pp$) collisions at the centre-of-mass energy, $\sqrt {s}$ = 7 TeV at the Large Hadron Collider (LHC) have been…

High Energy Physics - Phenomenology · Physics 2014-02-28 Premomoy Ghosh , Sanjib Muhuri

A calculation of the total cross section for top quark production in hadron-hadron collisions is presented based on an all-orders perturbative resummation of initial-state gluon radiative contributions to the basic quantum chromodynamics…

High Energy Physics - Phenomenology · Physics 2008-02-03 Edmond L. Berger , Harry Contopanagos

In this talk we present a perturbative QCD improved parton model calculation for light meson production in high energy heavy ion collisions. In order to describe the experimental data properly, one needs to augment the standard pQCD model…

Nuclear Theory · Physics 2011-03-23 Gabor Papp , Peter Levai , Gergely G. Barnafoldi , Yi Zhang , George Fai

Perturbative QCD results on pion production are presented in proton-proton, proton-nucleus and nucleus-nucleus collisions from CERN SPS up to RHIC energy. A K_{jet}(s, p_T, Q) factor obtained from jet production is applied to perform…

Nuclear Theory · Physics 2017-08-23 G. G. Barnafoldi , P. Levai , G. Papp , G. Fai , Y. Zhang

We report on the recent CMS measurements of soft hadron-hadron production, including the measurements of inclusive single- and double-diffractive cross sections, as well as the measurement of pseudorapidity distributions, and of the leading…

High Energy Physics - Experiment · Physics 2014-09-22 Robert Ciesielski

The hadroproduction of lepton pairs with mass $Q$ and transverse momentum $Q_T$ can be described in perturbative QCD by the same partonic subprocesses as prompt photon production. We demonstrate that, like prompt photon production, lepton…

High Energy Physics - Phenomenology · Physics 2008-11-26 E. L. Berger , M. Klasen

Because the LHC is a proton-proton collider, sizable production of two positively charged W-bosons in association with two jets is possible. This process leads to a distinct signature of same sign high-pt leptons, missing energy and jets.…

High Energy Physics - Phenomenology · Physics 2011-05-27 Tom Melia , Kirill Melnikov , Raoul Rontsch , Giulia Zanderighi

We present the production cross section of heavy quarks \sigma^{cc}, \sigma^{bb} and {\sigma^{tt}} at the next-to-leading order in the electron-proton interaction by using the quarks and gluon distribution functions at the initial scale…

High Energy Physics - Phenomenology · Physics 2023-01-31 S. Zarrin , S. Dadfar , M. Sayahi

We calculate the production of real photons in relativistic nuclear collisions at RHIC, consistently with the quenching of fast partons. We go beyond one-body observables, and evaluate photon-triggered fragmentation functions, in the…

High Energy Physics - Phenomenology · Physics 2010-01-15 Charles Gale

We set up a formalism, within the antenna subtraction framework, for computing the production of a massive quark-antiquark pair in electron positron collisions at next-to-next-to-leading order in the coupling $\alpha_s$ of quantum…

High Energy Physics - Phenomenology · Physics 2017-02-01 Long Chen , Oliver Dekkers , Dennis Heisler , Werner Bernreuther , Zong-Guo Si

We calculate and analyze Z and W production in association with quark-antiquark pair in k_T-factorization. Numerical calculations are performed using the Monte Carlo generator CASCADE for proton proton collisions at LHC energy. We compare…

High Energy Physics - Phenomenology · Physics 2014-11-18 M. Deak , F. Schwennsen

The vector bosons production at the Large Hadron Collider makes it possible to investigate in detail the basic structure of electroweak interactions. Besides the LHC with a good accuracy will be measure production of weak bosons ($pp \to…

High Energy Physics - Phenomenology · Physics 2018-06-12 Azad I. Ahmadov