“…In addition, an upper limit on the cross section for nonresonant Higgs boson pair production is set and compared to standard model Higgs boson pair production via gluon fusion. Constraints on anomalous couplings that affect Higgs boson pair production are also determined. …”
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“…The process can also be used to probe the gluon density function of the proton. Specific topologies can be used to extract the strong coupling constant. …”
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“…We show that the dijet invariant mass spectrum, and the inclusive jet transverse momentum spectrum, are sensitive to a dimension 6 operator that modifies the gluon propagator at high energies. The dominant effect is constructive or destructive interference with SM jet production. …”
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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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“…Due to the large multijet background, the direct observation of $H \to b\bar{b}$ in the gluon fusion channel is very challenging. Instead, looking for the associated production of a Higgs with a vector boson ($W/Z$), and triggering on leptonic decays of the vector boson provides an effective way to trigger on the $H \to b\bar{b}$ decays and reduce the overwhelming multijet background. …”
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“…Among these are the problem of neutrino mass, the (as yet) unobserved Higgs particle, the quark-gluon plasma, quantum aspects of gravity, and the so--called hierarchy problem. …”
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“…The Higgs boson is supposed to be produced via gluon-fusion and for the first time, results are also presented in terms of the associated production of a Higgs boson with a W/Z and in the context of inelastic thermal relic dark matter.…”
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“…The process can also be used to probe the gluon density in the parton distribution function of the proton. …”
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“…The nature of the Higgs sector is probed through searches for neutral resonances decaying to a pair of tau leptons in gluon-fusion and b-quark associated production modes with no observation of a significant excess. …”
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“…For the high-mass resonances considered ($\gtrsim 1~\mathrm{TeV}$), substructure techniques are employed to differentiate between the hadronization products of a vector boson decaying to quarks, a Higgs boson decaying to bottom quarks, and quark- or gluon-induced jets. Due to the large boost of the Higgs boson, the two leptons in the $H \rightarrow \tau^{+}\tau^{-}$ decay are collimated. …”
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“…The lead-lead data collected by the ATLAS detector at the LHC provide new opportunities to study dynamic properties of quark-gluon plasma. A tool to study these properties is the recently proposed modified Pearson's correlation coefficient, $\rho$, that quantifies the correlation between the mean transverse momentum in the event, $[p_T]$, and the square of the flow harmonic magnitude, $v_n^2$. …”
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“…The effects on event properties could be quite large if such a rearrangement would occur instantaneously, so that gluon emission would be restricted to each of the new singlets separately. …”
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“…The azimuthal anisotropies of particle yields observed in relativistic heavy-ion collisions have been traditionally considered as a strong evidence of the formation on a deconfined quark-gluon plasma produced in these collisions. However multiple recent measurements from the ATLAS Collaboration in pp and p+Pb systems show similar features as those observed in Pb+Pb collisions, indicating the possibility of the production of such a deconfined medium in smaller collision systems. …”
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“…The azimuthal anisotropies of particle yields observed in relativistic heavy-ion collisions have been traditionally considered as a strong evidence of the formation of a deconfined quark-gluon plasma produced in these collisions. However multiple recent measurements from the LHC experiments in $pp$ and $p$+Pb systems show similar features as those observed in Pb+Pb collisions, indicating the possibility of the production of such a deconfined medium in smaller collision systems. …”
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“…This implies that the spatial distribution of thegluons within the proton depends upon the gluon momentum. The cross section alsoincreases asWincreases from 57 to 439 GeV implying that the proton become moreand more opaque to photons as the photon energy increases. …”
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“…Novel forms of matter, such as states made of gluons (glueballs), multiquark mesons or baryons and hybrid mesons are predicted by low energy QCD, for which several candidates have recently been identified. …”
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“…Bottomonia are important probes of the Quark-Gluon Plasma (QGP) since they are produced at early times and propagate through the medium. …”
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“…It is the dedicated heavy-ion experiment and therefore primarily examines the Quark–Gluon Plasma. In order to prepare for the running conditions of 50 kHz lead-lead interactions at the LHC after the Long Shutdown 2 (2018–2021), an extensive upgrade program is carried out. …”
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“…A strongly interacting state of matter known as the Quark-Gluon Plasma (QGP) is formed in the high temperature and high energy density conditions reached in ultra-relativistic heavy-ion collisions, such as the Pb–Pb collisions measured at the Large Hadron Collider (LHC). …”
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“…In particular, ALICE provides three MC measurements related to the main observables used to characterize the properties of the produced Quark-Gluon Plasma. Historically, those MC measurements were developed independently, inheriting from the first one, by several ALICE groups. …”
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