scholarly journals Skewness, kurtosis, and the fifth and sixth order cumulants of net baryon-number distributions from lattice QCD confront high-statistics STAR data

2020 ◽  
Vol 101 (7) ◽  
Author(s):  
A. Bazavov ◽  
D. Bollweg ◽  
H.-T. Ding ◽  
P. Enns ◽  
J. Goswami ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Baryon Number ◽  
Sixth Order ◽  
Star Data

scholarly journals Light-cone sum rules for proton decay

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Ulrich Haisch ◽  
Amando Hala
Keyword(s):  
Lattice Qcd ◽  
Light Cone ◽  
Sum Rules ◽  
State Of The Art ◽  
Form Factors ◽  
Baryon Number ◽  
Proton Decay ◽  
Matrix Elements ◽  
Decay Channels ◽  
Systematic Uncertainties

Abstract We estimate the form factors that parametrise the hadronic matrix elements of proton-to-pion transitions with the help of light-cone sum rules. These form factors are relevant for semi-leptonic proton decay channels induced by baryon-number violating dimension-six operators, as typically studied in the context of grand unified theories. We calculate the form factors in a kinematical regime where the momentum transfer from the proton to the pion is space-like and extrapolate our final results to the regime that is relevant for proton decay. In this way, we obtain estimates for the form factors that show agreement with the state-of-the-art calculations in lattice QCD, if systematic uncertainties are taken into account. Our work is a first step towards calculating more involved proton decay channels where lattice QCD results are not available at present.

scholarly journals FINITE DENSITY ALGORITHM IN LATTICE QCD—A CANONICAL ENSEMBLE APPROACH

2002 ◽  
Vol 16 (14n15) ◽  
pp. 2017-2032 ◽  
Author(s):  
KEH-FEI LIU
Keyword(s):  
Monte Carlo ◽  
Lattice Qcd ◽  
Efficient Method ◽  
Chemical Potential ◽  
Canonical Ensemble ◽  
Unbiased Estimate ◽  
Baryon Number ◽  
Monte Carlo Algorithm ◽  
Finite Density ◽  
Ensemble Approach

I will review the finite density algorithm for lattice QCD based on finite chemical potential and summarize the associated difficulties. I will propose a canonical ensemble approach which projects out the finite baryon number sector from the fermion determinant. For this algorithm to work, it requires an efficient method for calculating the fermion determinant and a Monte Carlo algorithm which accommodates unbiased estimate of the probability. I shall report on the progress made along this direction with the Padé–Z2 estimator of the determinant and its implementation in the newly developed Noisy Monte Carlo algorithm.

scholarly journals van der Waals Interactions and Hadron Resonance Gas: Role of resonance widths modeling on conserved charges fluctuations

2018 ◽  
Vol 171 ◽  
pp. 14006
Author(s):  
Volodymyr Vovchenko ◽  
Paolo Alba ◽  
Mark I. Gorenstein ◽  
Horst Stoecker
Keyword(s):  
Lattice Qcd ◽  
Temperature Region ◽  
Van Der Waals ◽  
Baryon Number ◽  
The Other ◽  
Van Der Waals Interactions ◽  
Crossover Temperature ◽  
Lattice Data ◽  
The Ideal

The quantum van der Waals (QvdW) extension of the ideal hadron resonance gas (HRG) model which includes the attractive and repulsive interactions between baryons – the QvdW-HRG model – is applied to study the behavior of the baryon number related susceptibilities in the crossover temperature region. Inclusion of the QvdW interactions leads to a qualitatively different behavior of susceptibilities, in many cases resembling lattice QCD simulations. It is shown that for some observables, in particular for χBQ11/χB2, effects of the QvdW interactions essentially cancel out. It is found that the inclusion of the finite resonance widths leads to an improved description of χB2, but it also leads to a worse description of χBQ11/χB2, as compared to the lattice data. On the other hand, inclusion of the extra, unconfirmed baryons into the hadron list leads to a simultaneous improvement in the description of both observables.

scholarly journals Overlap between Lattice QCD and HRG with in-medium effects and parity doubling

2018 ◽  
Vol 171 ◽  
pp. 05001
Author(s):  
Kenji Morita ◽  
Chihiro Sasaki ◽  
Pok Man Lo ◽  
Krzysztof Redlich
Keyword(s):  
Lattice Qcd ◽  
Chiral Symmetry ◽  
Baryon Number ◽  
Negative Parity ◽  
Hadronic Matter ◽  
Gas Temperature ◽  
Medium Effects ◽  
Hadron Mass ◽  
The Individual ◽  
Mass Shifts

We investigate the fluctuations and correlations involving baryon number in hot hadronic matter with modified masses of negative-parity baryons, in the context of the hadron resonance gas. Temperature-dependent masses are adopted from the recent lattice QCD results and from a chiral effective model which implements the parity doubling structure with respect to the chiral symmetry. Confronting the baryon number susceptibility, baryon-charge correlation, and baryon-strangeness correlation and their ratios with the lattice QCD data, we show that the strong downward mass shift in hyperons can accidentally reproduce some correlation ratios, however it also tends to overshoot the individual fluctuations and correlations. This indicates, that in order to correctly account for the influence of the chiral symmetry restoration on the fluctuation observables, a consistent framework of in-medium effects beyond hadron mass shifts is required.

scholarly journals The quenched limit of lattice QCD at non-zero baryon number

1999 ◽  
Vol 558 (1-2) ◽  
pp. 307-326 ◽  
Author(s):  
J. Engels ◽  
O. Kaczmarek ◽  
F. Karsch ◽  
E. Laermann
Keyword(s):  
Lattice Qcd ◽  
Baryon Number

scholarly journals PERTURBATIVE RENORMALIZATION FACTORS OF BARYON NUMBER VIOLATING OPERATORS FOR IMPROVED QUARK AND GAUGE ACTIONS IN LATTICE QCD

2000 ◽  
Vol 15 (22) ◽  
pp. 3521-3533
Author(s):  
SINYA AOKI ◽  
YOSHINOBU KURAMASHI ◽  
TETSUYA ONOGI ◽  
NAOTO TSUTSUI
Keyword(s):  
Lattice Qcd ◽  
Baryon Number ◽  
Matrix Elements ◽  
Group Approach ◽  
Nucleon Decay ◽  
Effective Lagrangian ◽  
Renormalization Group Approach ◽  
Perturbative Renormalization ◽  
The One ◽  
The Continuum

We calculate one-loop renormalization factors of three-quark operators, which appear in the low energy effective Lagrangian of the nucleon decay, for O(a)-improved quark action and gauge action including six-link loops. This calculation is required to predict the hadronic nucleon decay matrix elements in the continuum regularization scheme using lattice QCD. We present detailed numerical results of the one-loop coefficients for general values of the clover coefficients employing the several improved gauge actions in the Symanzik approach and in Wilson's renormalization group approach. The magnitudes of the one-loop coefficients for the improved gauge actions show sizable reduction compared to those for the plaquette action.

scholarly journals Fluctuations and correlations of net baryon number, electric charge, and strangeness: A comparison of lattice QCD results with the hadron resonance gas model

2012 ◽  
Vol 86 (3) ◽  
Author(s):  
A. Bazavov ◽  
Tanmoy Bhattacharya ◽  
C. E. DeTar ◽  
H.-T. Ding ◽  
Steven Gottlieb ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Electric Charge ◽  
Baryon Number
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