“…The process can also be used to probe the gluon density function of the proton. The ATLAS collaboration has measured the inclusive jet production cross section in 20.3 /fb of data collected at a center-of-mass energy of 8TeV and in 3.2 /fb of data collected at a center-of-mass energy of 13TeV. …”
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“…These results are combined with a previous analysis performed on the same data set targeting the gluon fusion and vector boson fusion production modes with the Higgs boson decaying to a pair of $\tau$ leptons. …”
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“…Additional exclusion limits are set for a Kaluza--Klein (KK) excitation of the gluon in the Randall--Sundrum model and a model where a narrow $\mathrm{Z}^{\prime}$ resonance is exclusively produced in association with jets. …”
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“…These signatures include generic quark and gluon jets, as well as jets originating from b-quarks or the decay of massive particles (such as electroweak bosons or top quarks). …”
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“…These signatures include generic quark and gluon jets, as well as jets originating from b-quarks or the decay of massive particles (such as electroweak bosons or top quarks). …”
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“…</p> <p><span><span>We present the first measurement of antiproton production in proton-helium (pHe) fixed-target collisions at the LHC, which is an input for the modelling of the antiproton flux measured by AMS, and the first measurement of charm production in pHe and pAr fixed-target collisions at the LHC, which is of interest both for discussions of intrinsic charm and as a baseline for future ion-ion collision studies for quark-gluon plasma physics. Using data taken in collider mode, we discuss recent pPb collision measurements of quarkonia and open charm states, which probe nuclear modifications down to low Bjorken-x, and the measurement of J/psi production in ultra-peripheral PbPb collisions. …”
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“…The measurements are compared to various event generators, and discussed in terms of the saturation of gluon densities at low fractional parton momenta. …”
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“…These signatures include generic quark and gluon jets, as well as jets originating from $b$-quarks or the decay of massive particles (such as electroweak bosons or top quarks). …”
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“…Because photons do not carry color charge, they are unaffected by the medium, and thus provide information about the momentum, direction, and flavor (quark or gluon) of the associated hard-scattered parton before it begins to shower and becomes quenched. …”
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“…Measurements of charged-particle production in heavy-ion collisions and their comparison to $pp$ data provide insight into the properties of the quark-gluon plasma. In 2015, the ATLAS detector at the LHC recorded 0.49nb$^{-1}$ of Pb+Pb collisions and 25pb$^{-1}$ of $pp$ collisions at a center-of-mass energy of $\sqrt{s_{\mathrm{NN}}}=\sqrt{s}=5.02$TeV. …”
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“…If SUSY is present at the TeV scale, the pair production of the super-symmetric partners of the quarks and the gluons is among the most favoured to be generated at the LHC. …”
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“…In Pb-Pb, the mechanisms that give rise to such features have been traditionally associated to the formation of a Quark-Gluon Plasma (QGP), so that these findings raise a crucial question: could it be that a QGP is formed already in small systems?…”
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“…To measure these properties, the main Higgs production modes at LHC---gluon Fusion (ggF), Vector Boson Fusion (VBF) and associated production with vector bosons or top quarks (VH, ttH)---are considered, together with minor production modes. …”
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“…The cross-section times $H \to ZZ^{*}$ branching ratio with $|y_H|<$~2.5 for gluon fusion and vector-boson fusion production are measured to be $1.14~ \pm ~0.13~$ pb and $0.13 ~\pm ~0.04~$ pb, respectively. …”
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“…A search for the supersymmetric partners of quarks and gluons (squarks and gluinos) in final states containing jets and missing transverse momentum, but no electrons or muons, is presented. …”
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“…$Z$ and $W$ bosons decaying in leptonic channels are unaffected by the presence of the quark-gluon plasma and carry the information from the time when bosons were created, i.e. from the moment of the collision itself. …”
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“…Since the dominant production mechanism in $pp$ collisions proceeds via the $qg\rightarrow g\gamma$ process, measurements of prompt-photon and photon plus jet production are sensitive at leading order (LO) to the gluon density in the proton. We present in this proceeding the latest ATLAS cross-section measurements of the ratio of the cross sections for inclusive isolated-photon production at centre-of-mass energies of 13 and 8 TeV, the measurements of isolated-photon plus jet cross sections at $\sqrt{s}$ = 13 TeV using a dataset with an integrated luminosity of 3.2 fb$^{-1}$ and the differential cross section for isolated-photon production measured at $\sqrt{s}$ = 13 TeV using an integrated luminosity of 36.1 fb$^{-1}$. …”
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“…Suppression of the $\rm{ D_{s}^{+}}$ nuclear modification factor ($\rm{R_{AA}}$) in PbPb collisions suggests a strong interaction between charm quarks and the quark-gluon plasma. The double ratio of prompt $\rm{ D_{s}^{+}}$ to prompt ${\rm D^{0}}$ production in pp and PbPb is consistent with a PHSD model calculation and consistent with unity, which indicates that strange charm meson enhancement in PbPb collisions is not significant in the measured $\rm{ D_{s}^{+}}$ $p_{T}$ interval.…”
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“…Measurements of hard-scattered partons produced in conjunction with a high-pT Z boson offer a discerning way to study the quark gluon plasma (QGP) created in ultrarelativistic nucleus-nucleus collisions. …”
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“…The production and survival of the prompt X(3872) in the quark-gluon plasma is expected to depend upon its internal structure. …”
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