“…We show that if the quark-gluon plasma is flowing with velocity v_f at an angle theta with respect to the trajectory of a hard parton, the jet quenching parameter $\hat q$ is modified by a factor gamma_f(1-v_f cos theta), and show that this result applies in QCD as in N=4 SYM. …”
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“…At these energies quarks are loosing their confinement into hadrons and may move around freely, the “quark-gluon plasma” (QGP) is created. Such a picture deserves of course a thorough check and a precise measurement. …”
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“…More recent proposals predict a heavy partner of the gluon in certain models with additional spatial dimensions. …”
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“…[try] to find out whether the famous quark-gluon plasma really has been achieved”. One would have thought that with almost one physicist per particle, this would have been figured out rather quickly. …”
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“…A cross-over between ordinary nuclear matter and a state of de-confined quarks and gluons, the Quark Gluon Plasma (QGP), is predicted by lattice QCD calculations at low chemical potential and high temperature in the nuclear phase diagram. …”
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“…Non-perturbative intrinsic-k$_{T}$ effects are approximated by a simple phenomenological model introducing a Gaussian k$_{T}$ -smearing of the parton distribution functions, which might also mimic perturbative effects due to multiple initial-state soft-gluon emissions. The transition from partonic to hadronic states is described by phenomenological fragmentation functions. …”
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“…Previous searches for Higgs boson pair production in the $b\bar{b}b\bar{b}$ channel were carried out in the gluon-gluon fusion (ggF) production mode by the ATLAS and CMS collaborations and limits were set for resonant and non-resonant productions. …”
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“…Two most dominant production modes of the Higgs boson, gluon-gluon fusion and vector boson fusion (VBF), are considered. …”
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“…A simulation study using helicity angles sensitive to $HH$ production to distinguish vector boson fusion process from gluon-gluon fusion process and use of the helicity angles in CMS search for $HH \to b\bar{b}\gamma \gamma $ has been presented.…”
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“…We simulate the dynamics of Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC) with a hybrid model that treats the dense early quark-gluon plasma (QGP) stage macroscopically as an ideal fluid, but models the dilute late hadron resonance gas (HG) microscopically using a hadronic cascade. …”
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“…We propose to use precision studies of these scaling violations to help constrain the shear viscosity eta/s of the quark-gluon plasma created in relativistic heavy ion collisions.…”
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“…Resonance production at the LHC is of great interest in the study of the phase state of hadronic matter known as a Quark Gluon Plasma (QGP). Results are presented on the prospects for phi(1020) meson production from LHC start-up to optimal running conditions in pp collisions. …”
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“…Therefore, they must correlate the color and kinematic degrees of freedom of at least four hard partons, corresponding to gluon webs that connect four eikonal lines, which first appear at three loops. …”
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“…Keeping the strange quark mass at its physical value, we reduced the masses of the up and down quarks until, under an increase of temperature, the system underwent a second-order phase transition to a quark-gluon plasma. Then we measured the response of this system to an increase in the quark density. …”
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“…The Tevatron Run II jet production data prefer a smaller high-x gluon than the previous Run I data, which impacts on predictions for Higgs cross sections at the Tevatron. …”
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“…Another type of exclusive events is the central exclusive production (CEP) initiated by the exchange of two gluons. We co mpared in detail the prediction of the available models to the Tevatron exclusive dijet data. …”
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“…New M divergences are found, IR singularities occur and overlapping M and IR singularities exist leading to double poles if n-dimensional regularization is used. Gluon gauge invariance must be satisfied. Although the off-shell method leads to gauge-dependent parton cross sections, the correction terms extracted via M factorization remain gauge invariant. …”
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“…A second important piece of information is the probability to tag a jet originating from a light-flavour (u-, d-, s-quark or gluon) jet, referred to as the mistag rate. Both the b-tag efficiency and the mistag rate have been measured with data from the ATLAS detector using a range of methods. …”
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“…A second important piece of information is the probability to tag a jet originating from a light-flavour (u-, d-, s-quark or gluon) jet, referred to as the mistag rate. Both the b-tag efficiency and the mistag rate have been measured with data from the ATLAS detector using a range of methods. …”
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“…Heavy ion collisions at LHC will produce a new state of matter : the quark-gluon plasma (QGP). Photons are not sensible to the strong interaction which dominates the nuclear medium, and hence are a valuable tool to explore QGP. …”
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