Diffractive production of high-ptphotons at HERA

Cox, B. E.; Forshaw, Jeffrey R.

doi:10.1088/0954-3899/26/5/330

Cited by 12 publications

(14 citation statements)

References 10 publications

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“…Recently, the meron concept has been generalized to fermions [9]. Meron-cluster algorithms have led to a complete solution of the fermion sign problem in a variety of models including non-relativistic spinless fermions [9,10], relativistic staggered fermions [11,12,13] and some models in the Hubbard model family [8,14]. 1 Recently, a meron-cluster algorithm has been used to solve the sign problem that arises for quantum antiferromagnets in an external magnetic field [15].…”

Section: Introductionmentioning

confidence: 99%

Solution of the complex action problem in the Potts model for dense QCD

et al. 2001

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Monte Carlo simulations of lattice QCD at non-zero baryon chemical potential µ suffer from the notorious complex action problem. We consider QCD with static quarks coupled to a large chemical potential. This leaves us with an SU(3) Yang-Mills theory with a complex action containing the Polyakov loop. Close to the deconfinement phase transition the qualitative features of this theory, in particular its Z(3) symmetry properties, are captured by the 3-d 3-state Potts model. We solve the complex action problem in the Potts model by using a cluster algorithm. The improved estimator for the µ-dependent part of the Boltzmann factor is real and positive and is used for importance sampling. We localize the critical endpoint of the first order deconfinement phase transition line and find consistency with universal 3-d Ising behavior. We also calculate the static quark-quark, quark-anti-quark, and anti-quark-anti-quark potentials which show screening as expected for a system with non-zero baryon density.

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Section: Introductionmentioning

confidence: 99%

Solution of the complex action problem in the Potts model for dense QCD

et al. 2001

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“…The phase diagram of GNM 3 with various global symmetries at non-zero temperature and density has been studied extensively in [3−10]. More specifically [5,6], it was shown that the thermally induced phase transition of the Z 2 -symmetric model belongs to the twodimensional Ising universality class in accordance with the dimensional reduction scenario [11] which predicts that the long-range behaviour at the chiral phase transition is that of the (d − 1) spin model with the same symmetry, because the IR region of the system is dominated by the zero Matsubara mode of the bosonic field. Outside the non-trivial region the critical properties of the system are described by mean field theory according to the large-N f prediction.…”

Section: Introductionmentioning

confidence: 99%

The (2+1)-dimensional Gross–Neveu model with a U(1) chiral symmetry at nonzero temperature

2001

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We present results from numerical simulations of the (2 + 1)-dimensional Gross-Neveu model with a U(1) chiral symmetry and N f = 4 fermion species at non-zero temperature. We provide evidence that there are two different chirally symmetric phases, one critical and one with finite correlation length, separated by a Berezinskii-Kosterlitz-Thouless transition. We have also identified a regime above the critical temperature in which the fermions acquire a screening mass even in the absence of chiral symmetry breaking, analogous to the pseudogap behaviour observed in cuprate superconductors.

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“…+0.03 −0.08 (syst.). The cross sections were compared to the LLA BFKL predictions [22,23,24], using the HERWIG Monte Carlo with no |t| reweighting, as shown in Fig. 4.…”

Section: Pos(eps-hep 2009)333mentioning

confidence: 99%

Exclusive Photoproduction at HERA

Szuba¹

2010

Proceedings of European Physical Society Europhysics Conference on High Energy Physics — PoS(EPS-HEP 2009)

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The exclusive ϒ photoproduction, γ p → ϒp, has been studied with the ZEUS experiment in ep collisions at HERA using an integrated luminosity of 468 pb −1. The measurement covers the kinematic range 60 < W < 220 GeV and Q 2 < 1 GeV 2 , where W is the photon-proton centre-ofmass energy and Q 2 is the photon virtuality. These results, which represent the analysis of the full ZEUS data sample for this channel, are compared to predictions based on perturbative QCD. The * Speaker. † on behalf of the ZEUS and H1 Collaborations

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Diffractive production of high-p_tphotons at HERA

Abstract: Abstract. We study the diffractive production of high p t photons at HERA. We have implemented the process as a new hard sub-process in the HERWIG event generator in order to prepare the ground for a future measurement.

Cited by 12 publications

References 10 publications

Solution of the complex action problem in the Potts model for dense QCD

Solution of the complex action problem in the Potts model for dense QCD

The (2+1)-dimensional Gross–Neveu model with a U(1) chiral symmetry at nonzero temperature

Exclusive Photoproduction at HERA

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