Higher order fluctuations and correlations of conserved charges from lattice QCD

We investigate the role of suspected resonance states, that are yet to be confirmed experimentally, on different thermodynamic quantities as well as the higher-order fluctuations and the correlation between conserved charges using ideal hadron resonance gas (HRG) model. We have discussed the temperature dependence of the various thermodynamic quantities and compared them with the lattice QCD result. We observe that the values of the bulk thermodynamic variables such as pressure, energy density, entropy density and second-order susceptibilities are increased by the inclusion of the additional resonances. Further, we find that the hadronic phase of lattice QCD result of [Formula: see text] and [Formula: see text] can be described well in ideal HRG model with the additional resonances. We have also studied the [Formula: see text] dependence of the fluctuation observables of net-proton, net-kaon and net-charge. Proper experimental acceptance cuts have been used in the model to compare with the data from experimental measurements. It has been observed that the experimental data of lower-order fluctuation observable can be described well by the ideal HRG model. However, higher-order fluctuation observables cannot be described by ideal HRG model for all [Formula: see text] studied here, which indicates the possibility of presence of critical or nonequilibrium physics for those energies. The effect of additional resonances on fluctuation observables of net-charge at different [Formula: see text] has also been studied. Finally, the chemical freeze-out parameters have been extracted from the experimental data of [Formula: see text] of net-proton and net-charge using two different sets of hadronic spectra. We find that for both the sets, the extracted temperature is slightly lower than those obtained from the hadronic yields. Moreover, it is observed that the extracted temperature of the system gets further reduced with addition of more resonances.

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Role of repulsive interactions in the interplay with missing strange resonances

EPJ Web of Conferences ◽

10.1051/epjconf/201817114001 ◽

2018 ◽

Vol 171 ◽

pp. 14001

Author(s):

Paolo Alba

Keyword(s):

Lattice Qcd ◽

Quark Model ◽

Higher Order ◽

Excluded Volume ◽

Comprehensive Description ◽

Hadronic Interactions ◽

Conserved Charges ◽

Repulsive Interactions ◽

Resonance Formation

The standard implementation of the HRG model has been shown to be unable to describe all the available data on QCD matter. Here we show the balance of repulsive and attractive hadronic interactions on QCD thermodynamics through observables both calculated by lattice simulations and measured in experiment. Attractive interactions are mediated by resonance formation, which are here implemented through extra states predicted by the Quark Model, while repulsive interactions are modelled by means of Excluded Volume (EV) effects. Informations on flavour dependent effective sizes are extracted. It is found that EV effects are present in lattice QCD thermodynamics, and are essential for a comprehensive description of higher order fluctuations of conserved charges.

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Confronting fluctuations of conserved charges in central nuclear collisions at the LHC with predictions from Lattice QCD

Nuclear Physics A ◽

10.1016/j.nuclphysa.2016.02.024 ◽

2016 ◽

Vol 956 ◽

pp. 805-808 ◽

Cited By ~ 3

Author(s):

P. Braun-Munzinger ◽

A. Kalweit ◽

K. Redlich ◽

J. Stachel

Keyword(s):

Lattice Qcd ◽

Conserved Charges ◽

Nuclear Collisions

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Confronting fluctuations of conserved charges in central nuclear collisions at the LHC with predictions from Lattice QCD

Physics Letters B ◽

10.1016/j.physletb.2015.05.077 ◽

2015 ◽

Vol 747 ◽

pp. 292-298 ◽

Cited By ~ 29

Author(s):

P. Braun-Munzinger ◽

A. Kalweit ◽

K. Redlich ◽

J. Stachel

Keyword(s):

Lattice Qcd ◽

Conserved Charges ◽

Nuclear Collisions

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Fluctuations of conserved charges from imaginary chemical potential

EPJ Web of Conferences ◽

10.1051/epjconf/201817507036 ◽

2018 ◽

Vol 175 ◽

pp. 07036

Author(s):

Jana N. Guenther ◽

Szabolcs Borsányi ◽

Zoltan Fodor ◽

Sandor D. Katz ◽

Attila Pásztor ◽

...

Keyword(s):

Experimental Data ◽

Chemical Potential ◽

Heavy Ion ◽

Higher Order ◽

Order Derivative ◽

Heavy Ion Collision ◽

Lattice Calculation ◽

Eighth Order ◽

Conserved Charges ◽

Ion Collision

When comparing lattice calculation to experimental data from heavy ion collision experiments, the higher order fluctuations of conserved charges are important observables. An efficient way to study these fluctuations is to determine them from simulations at imaginary chemical potential. In this talk we present results up to the six order derivative in μB (with up to eighth order included in the fit), calculated on a 483 × 12 lattice with staggered fermions using different values of μB while μS = μQ = 0.

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Non-equilibrium time evolution of higher order cumulants of conserved charges and event-by-event analysis

Physics Letters B ◽

10.1016/j.physletb.2013.12.008 ◽

2014 ◽

Vol 728 ◽

pp. 386-392 ◽

Cited By ~ 28

Author(s):

Masakiyo Kitazawa ◽

Masayuki Asakawa ◽

Hirosato Ono

Keyword(s):

Time Evolution ◽

Higher Order ◽

Event Analysis ◽

Equilibrium Time ◽

Conserved Charges ◽

Higher Order Cumulants ◽

Non Equilibrium

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Heavy Quark Expansion of Λb→Λ*(1520) Form Factors beyond Leading Order

Symmetry ◽

10.3390/sym13040531 ◽

2021 ◽

Vol 13 (4) ◽

pp. 531

Author(s):

Marzia Bordone

Keyword(s):

Lattice Qcd ◽

Heavy Quark ◽

Form Factors ◽

Higher Order ◽

Leading Order ◽

Lattice Data ◽

Tensor Form ◽

Higher Order Terms ◽

First Time

I review the parametrisation of the full set of Λb→Λ*(1520) form factors in the framework of Heavy Quark Expansion, including next-to-leading-order O(αs) and, for the first time, next-to-leading-power O(1/mb) corrections. The unknown hadronic parameters are obtained by performing a fit to recent lattice QCD calculations. I investigate the compatibility of the Heavy Quark Expansion and the current lattice data, finding tension between these two approaches in the case of tensor and pseudo-tensor form factors, whose origin could come from an underestimation of the current lattice QCD uncertainties and higher order terms in the Heavy Quark Expansion.

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