Recent results on moments of parton distribution functions

Wetzorke, I.; Jansen, Karl; Palombi, Filippo; Shindler, Andrea

doi:10.1016/j.nuclphysbps.2004.11.137

Cited by 3 publications

(2 citation statements)

References 6 publications

(7 reference statements)

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“…Figure 2 shows, however, large finite size effects for these small lattices and a strong change in the estimate around N s m π ∼ 6. Such finite size effects are expected theoretically [10] and have been seen in other cases such as chiral condensates [11] and lattice QCD evaluations of structure functions [12]. A key consequence of our use of larger volumes than before is that we find a shift in the critical end point to µ B /T ∼ 1 − 2, as is evident from Figure 2.…”

Section: Our Resultssupporting

confidence: 71%

Results from Lattice QCD

Gavai

2006

J. Phys.: Conf. Ser.

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Abstract. I present our recent results on the critical end point in the µB-T phase diagram of QCD with two flavours of light dynamical quarks and compare them with similar results from other groups. Implications for a possible energy scan at the RHIC are discussed. I also comment briefly on the new results of great relevance to heavy ion collisions from finite temperature lattice QCD simulations on speed of sound, specific heat and on the fate of J/ψ. IntroductionLattice Quantum Chromo Dynamics (QCD), defined on a space-time lattice, has been our best and most reliable tool to extract non-perturbative physics of the strongly interacting theory for over a decade now. In many cases, such as the hadron spectra or the weak decay constants, the focus of lattice QCD has now shifted to obtaining more precise results. In the fields of strong interest to this conference, namely Relativistic Heavy Ion Collisions and the possible transition to the new Quark-Gluon Plasma (QGP) phase, also there are similar examples : the quark-hadron transition temperature [1], T c , the Wróblewski Parameter [2], λ s and the the equation of state [1]. Already a lot of reliable theoretical information on these physical observables of interest has been predicted by lattice QCD and again the focus is now for better precision. Due to the strong influence of dynamical fermions on thermodynamics and the nature of the phase transition, one still has some way to go before precise prediction for realistic world of two light (u and d) and one heavy (s) flavour become available. Nevertheless, the continuing progress in lattice QCD makes it perhaps a reachable goal. I shall be unable to review all the important recent lattice results in the time available. I have therefore chosen to focus on those with thrust on something new, either conceptually or quantitatively. In particular, I shall cover the new results on the T -µ B phase diagram and the physically interesting question of J/ψ-dissolution/persistence. An interesting theoretical issue these days has been the comparison of predictions of conformally invariant theories with lattice QCD results. I shall show one such comparison along with new results for speed of sound.

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Section: Our Resultssupporting

confidence: 71%

Results from Lattice QCD

Gavai

2006

J. Phys.: Conf. Ser.

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Section: Our Resultsmentioning

confidence: 61%

The Wroblewski parameter from lattice QCD

Gavai¹,

Gupta²

2004

J. Phys. G: Nucl. Part. Phys.

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I present our recent results on the critical end point in the µ B -T phase diagram of QCD with two flavours of light dynamical quarks and compare them with similar results from other groups. Implications for a possible energy scan at the RHIC are discussed. I also comment briefly on the new results of great relevance to heavy ion collisions from finite temperature lattice QCD simulations on speed of sound, specific heat and on the fate of J/ψ.

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Non-perturbative renormalization of left-left four-fermion operators in quenched lattice QCD

Collaboration

Guagnelli

Heitger

et al. 2006

J. High Energy Phys.

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We define a family of Schrödinger Functional renormalization schemes for the four-quark multiplicatively renormalizable operators of the ∆F = 1 and ∆F = 2 effective weak Hamiltonians. Using the lattice regularization with quenched Wilson quarks, we compute non-perturbatively the renormalization group running of these operators in the continuum limit in a large range of renormalization scales. Continuum limit extrapolations are well controlled thanks to the implementation of two fermionic actions (Wilson and Clover). The ratio of the renormalization group invariant operator to its renormalized counterpart at a low energy scale, as well as the renormalization constant at this scale, is obtained for all schemes.

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Recent results on moments of parton distribution functions

Cited by 3 publications

References 6 publications

Results from Lattice QCD

Results from Lattice QCD

The Wroblewski parameter from lattice QCD

Non-perturbative renormalization of left-left four-fermion operators in quenched lattice QCD

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