“…Upper limits on the cross section times branching ratio for gluon-fusion and b-associated Higgs production are also given.…”
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“…At LHC tt¯ production is 90% through gluon fusion and 10% through quark annihilation. …”
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“…In the present theory of strong interactions Quantum Chromodynamics proposed by H Fritzsch and Gell-Mann in 1972 the forces that bind the quarks together are due to the exchange of eight gluons. On the 50th anniversary of the quark model, this invaluable volume looks back at the developments and achievements in the elementary particle physics that eventuated from that beautiful model. …”
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“…Lower mass limits are set for the decays of narrow and wide width leptophobic topcolor Z' bosons, as well as for Kaluza-Klein gluon excitations as predicted in theories beyond the standard model.…”
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“…High-energy ion colliders are large research tools in nuclear physics to study the Quark-Gluon-Plasma (QGP). The range of collision energy and high luminosity are important design and operational considerations. …”
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“…According to the color-screening model, these mesons give important information about the deconfined medium called Quark-Gluon Plasma (QGP) produced in ultrarelativistic heavy-ion collisions. …”
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“…The impact of the measurements to constraint the gluon PDF is also evaluated. The cross sections for photons produced in association with a jet are also measured by the ATLAS collaboration using an integrated luminosity of 37~pb$^{-1}$ as functions of photon and jet kinematics and are compared to JETPHOX calculation. …”
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“…Current and future runs of the LHC will offer sufficient data to do so, thus machine learning techniques used to separate the two most frequent Higgs boson production modes - gluon fusion and vector boson fusion - were studied and the findings are presented in this report. …”
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“…In proton-proton collisions at the LHC, pairs of top and anti-top quarks are expected to be mostly produced through gluon fusion and the large number of ttbar pairs can be used to test the predictions of Quantum Chromodynamics. …”
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“…The jet charge can also be used to tag hadronically decaying gauge bosons and the number of charged particles within a jet provides a powerful means to distinguish gluon-initiated from quark-initiated jets. The ATLAS collaboration has used a selection of di-jet events in 20.3 /fb of data collected at a center-of-mass energy of 8TeV to measure the average charged-particle multiplicity and the transverse-momentum weighted average charge of the hadrons within the jets, separately for the more central and the more forward jet and as a function of the jet transverse momentum. …”
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“…Measurements of top quark properties in single top quark production such as the top-quark polarisation, W-helicity in top quark decay and searches for anomalous couplings to gluons, photons are also presented,. A search for the s-channel is also performed.…”
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“…Production of prompt isolated photons at hadron colliders provides a probe of perturbative QCD and can be used to study the gluon density function of the proton. The ATLAS collaboration has performed precise measurements of the inclusive production of isolated prompt photons in 20.2 fb${}^{-1}$ of data collected at $\sqrt{s}=8$ TeV and in 6.4 pb${}^{-1}$ of data collected at $\sqrt{s}=13$ TeV. …”
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“…This kind of measurements were recently used to investigate novel approaches to the description of parton radiation, showcasing the importance of resummation of threshold logarithms in QCD and of electroweak corrections, further they are also sensitive at leading order to the gluon density in the proton. ATLAS has made public very recently the first measurements of inclusive photon production in the new kinematic regime opened by the 13 TeV collisions with an integrated luminosity of 3.2 fb^{-1}. …”
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“…Signal strengths associated with the different Higgs boson production mechanisms, coupling modifiers to bosons and fermions, and effective couplings to photons and gluons are also measured.…”
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“…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. 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 jets and a first measurement of the production cross-section of tri-photon final states at a center of mass energy of 8 TeV, as well as a photon plus jet cross section measurement at 13 TeV. …”
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“…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. 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 jets and a first measurement of the production cross-section of tri-photon final states at a center of mass energy of 8 TeV, as well as a photon plus jet cross section measurement at 13 TeV. …”
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“…At the HL-LHC (HE-LHC), the production of a Randall--Sundrum gluon can be excluded at $95\%$ confidence level with a mass up to $6.6$ $(10.7)~\mathrm{TeV}$ or can be discovered at $5\sigma$ significance with a mass up to $5.7$ $(9.4)~\mathrm{TeV}$.…”
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“…In particular, the b-jet triggers can exploit flavor-tagging algorithms in order to identify whether a jet is likely to have been produced by heavy-flavor quarks (b- and c-jets) or by light jets (jets from u-, d-, s- and gluon jets). Physics analyses that include processes with large jet multiplicity and b-quarks in the final state, such as Higgs to bottom pairs measurements and SUSY searches, rely on such a capability. …”
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“…The ATLAS W and Z boson data exhibit sensitivity to the valence quark distributions and the light quark sea composition, whereas the top-quark pair production data have sensitivity to the gluon distribution. The impact of the top-antitop production data is increased by fitting several distributions simultaneously, with the full information on the systematic and statistical correlations between data points. …”
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“…--HTML-->We study chemical equilibration in out-of-equilibrium Quark-Gluon Plasma using the QCD effective kinetic theory in longitudinally expanding systems. …”
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