“…The ALICE experiment at LHC is dedicated to investigate the transition of matter from the hadron gaz to the Quark and Gluons Plasma in which partons are deconfined. Ultra-relativistic heavy-ion collisions offer indeed the possibility to create extreme temperature and pressure conditions which are required to reach a deconfined phase. …”
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“…Events are further classified for analysis according to probability of the jets to originate from quarks of light or heavy flavor or from gluons. No evidence for a Higgs boson is found and upper limits on the Higgs boson production cross section are set in the range of masses between 130~GeV and 600~GeV.…”
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“…The events are classified according to probability of the jets to originate from quarks of light or heavy flavor or from gluons. No evidence for a Higgs boson is found and upper limits on the Higgs boson production cross section are set in the range of masses between $226 GeV/c^{2}$ and $600 GeV/c^{2}$.…”
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“…We thus use the measurement of the angular ratio as a function of mass to set limits on the cross sections of new spin-$\frac{1}{2}$ quark-gluon resonances. We exclude excited quarks of mass less than 3.2 TeV at 95\% confidence level, where a limit of 2.8~TeV is expected.…”
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“…For squark and gluino production, which dominate the inclusive SUSY cross section, we employ calculations which include the resummation of soft gluon emission at next-to-leading logarithmic accuracy, matched to next-to-leading order (NLO) SUSY-QCD. …”
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“…A search is performed for pair-produced massive vector bosons, each decaying into scalar particles, which further decay to two gluons, resulting in an 8-jet final state. The dataset used was collected with the CMS detector from LHC proton-proton collisions at $\sqrt{s}=7\,\text{TeV}$, and corresponds to an integrated luminosity of 5.0$\,\text{fb}^{-1}$. …”
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“…In the lepton+jets channel a leptophobic top-colour $Z'$ with a small width could be excluded at the 95% CL in the range $0.5TeV < m_{Z'} < 1.7 TeV$ as a benchmark scenario. Kaluza-Klein gluons and $Z'$ bosons with larger widths could be excluded in similar mass ranges.…”
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“…--HTML-->The ultimate goal of Heavy-Ion collisions is the study of the properties of the deconfined and chirally restored medium known as the Quark-Gluon Plasma. With the advent of the Large Hadron Collider (LHC) a new energy regime was reached. …”
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“…The pseudorapidity of the dijet system changes monotonically with increasing forward calorimeter activity in the direction expected from gluon saturation.…”
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“…Data collected with the ATLAS detector are used and searched for FCNC events in which a light quark (u or c) interacts with a gluon to produce a single top quark. Candidate events of top quarks decaying leptonically are selected and classified into signal- and background-like events using a neural network. …”
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“…The resulting distributions can be interpreted statistically to form new observables, allowing the separation of boosted, hadronically-decaying particles from light quark and gluon backgrounds. We present a study of Q-jets in boosted, hadronically-decaying $W$ boson and dijet samples, demonstrating the discriminating power of this technique. …”
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“…Then, modifications to the shower to take into account the top quark width are presented along with radiation patterns from top quark production processes for up to two external gluons. A general algorithm is outlined for systematically including these corrections. …”
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“…At the same time the experimental uncertainties are smaller than in previous publications such that these data constrain the parton distribution functions of the proton, notably for the gluon at high fractions of the proton momentum, and provide valuable input to determine the strong coupling at high momentum scales. …”
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“…The results will be compared to model calculations and their implications for the study of nuclear gluon shadowing will be discussed. First results on J/Psi photoproduction in p-Pb collisions will also be discussed and compared with previous measurements and QCD based models.…”
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“…Lead-lead collisions at the LHC are capable of producing a system of deconfined quarks and gluons at unprecedented energy density and temperature. …”
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“…Various tagging approaches and different grooming algorithms are compared in simulation, using a signal of large-$R$ jets containing a highly boosted $W$ boson and a background of large-$R$ jets originating from high-momentum light quarks or gluons. These techniques could also be utilised to identify hadronic decays of boosted $Z$ and Higgs bosons. …”
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“…Measurements of electroweak boson production ($\gamma$, $\Wboson$/$\Zboson$) in heavy ion events provide a novel way to probe the properties of a quark-gluon plasma. Since these bosons do not interact with the strongly-coupled medium, measurements that combine their production yields with those from jets provide useful quantitative insights into the jet-quenching mechanism. …”
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“…The results obtained for the gluon fusion process for centre-of-mass energies of 8 TeV and 7 TeV respectively, are σ (8T eV) = 25.4 +3.6-3.5 (stat) +2.9 - 2.3 (syst) pb and σ (7T eV) = 19.0 +6.2 - 6.0 (stat) +2.6 -1.9 (syst) pb. …”
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“…In this Very Short Introduction Frank Close gives an account of how this area of physics has progressed, including the recognition of how heavy nuclei are built up in the cores of stars and in supernovae, the identification of quarks and gluons, and the development of quantum chromodynamics (QCD). …”
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“…The analysis is divided into categories of additional jet activity in order to highlight the gluon fusion and vector boson fusion production mechanisms improving the sensitivity. …”
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