Inertial Confinement Fusion 1995 Annual Report

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3. 1 Medium-induced radiative energy loss After its production in a hard collision, an energetic parton radiates a gluon with a probability which is proportional to its path length L in the dense medium. Then (Fig. 2) the radiated gluon suffers multiple scatterings in the medium, in a Brownian-like motion with mean free path λ which decreases as the density of the medium increases. The number of scatterings of the radiated gluon is also proportional to L. Therefore, the average energy loss of the parton is proportional to L2 .

However, as in QED, bremsstrahlung (or, better, ‘gluon bremsstrahlung’) is another important source of energy loss [39]. Due to multiple (inelastic) scatterings and induced gluon radiation hard partons lose energy and become quenched. Such radiative loss, as we show in the following, is considerably larger than the collisional one. 3. 2. Typical gluon radiation diagram [49]. 39, 40, 41, 42, 43, 44, 45, 46, 47, 48]. In the next section we present the general lines of the model proposed by R. L. H.

Novel aspects of heavy ion physics at the LHC 25 We can consider the simple case of the production of a heavy quark pair, QQ, through the leading order5 gluon–gluon fusion process gg → QQ in the collision of two ions (A1 , Z1 ) and (A2 , Z2 ). s. energy per nucleon pair sNN , on the invariant mass6 MQQ of the QQ pair produced in the hard scattering and on the rapidity yQQ of the pair. s. energy for pp collisions (14 TeV at the LHC). 5) and its longitudinal rapidity in the laboratory is: yQQ = 1 1 E + pz x1 Z1 A2 = ln .

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Inertial Confinement Fusion 1995 Annual Report
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