Determination of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>α</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:math>from the QCD static energy: An update

Bazavov, A.; Brambilla, Nora; Tormo, Xavier Garcia i; Petreczky, Péter; Soto, Joan; Vairo, Antonio

doi:10.1103/physrevd.90.074038

Cited by 191 publications

(376 citation statements)

References 69 publications

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“…The lattice spacing values that we use range from a ¼ 0.15 fm to a ¼ 0.09 fm. The configurations have welltuned sea strange quark masses and sea light quark masses (m u ¼ m d ¼ m l ) with ratios to the strange mass from m l =m s ¼ 0.2 down to the value that corresponds to the experimental π meson mass of m l =m s ¼ 1=27.4 [16].…”

Section: Lattice Calculationmentioning

confidence: 97%

“…We also give, in column 8, values for δx sea , the fractional difference in the sum of the light quark masses from their physical values. δx sea is defined as ð2m l þ m s Þ=ð2m l;phys þ m s;phys Þ − 1, using values of m s;phys from [6] and m s =m l ¼ 27.4 [16]. L=a × T=a gives the spatial and temporal extent of the lattices and n cfg is the number of configurations in each ensemble.…”

Section: A Nrqcd Valence Quarksmentioning

confidence: 99%

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B-meson decay constants: A more complete picture from full lattice QCD

et al. 2015

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We extend the picture of B-meson decay constants obtained in lattice QCD beyond those of the B, B s and B c to give the first full lattice QCD results for the B Ã , B Ã s and B Ã c . We use improved nonrelativistic QCD for the valence b quark and the highly improved staggered quark (HISQ) action for the lighter quarks on gluon field configurations that include the effect of u=d, s and c quarks in the sea with u=d quark masses going down to physical values. For the ratio of vector to pseudoscalar decay constants, we find f B Ã =f B ¼ 0.941ð26Þ, f B Ã s =f B s ¼ 0.953ð23Þ (both 2σ less than 1.0) and f B Ã c =f B c ¼ 0.988ð27Þ. Taking correlated uncertainties into account we see clear indications that the ratio increases as the mass of the lighter quark increases. We compare our results to those using the HISQ formalism for all quarks and find good agreement both on decay constant values when the heaviest quark is a b and on the dependence on the mass of the heaviest quark in the region of the b. Finally, we give an overview plot of decay constants for gold-plated mesons, the most complete picture of these hadronic parameters to date.

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Section: Lattice Calculationmentioning

confidence: 97%

Section: A Nrqcd Valence Quarksmentioning

confidence: 99%

B-meson decay constants: A more complete picture from full lattice QCD

et al. 2015

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“…Now, since the confined dressed-quark contribution to the physical pressure must vanish on T ≃ 0, it follows that I exhibits a maximum at some T M , the value of which serves to define a useful reference temperature. [40]; long-dashed (green) [41]; and dot-dashed (red) [42]. Gluon-only contribution: dotted (pink) curve [43].…”

Section: Dressed-quark Pressurementioning

confidence: 99%

“…[41]; and band (green) -lQCD results from Ref. [42]. µ > 0: whilst increasing µ produces an increase in the pressure at all values of temperature, it only materially increases the interaction energy on T < T M .…”

Section: Phase Diagram and Thermodynamicsmentioning

confidence: 99%

Phase diagram and thermal properties of strong-interaction matter

et al. 2016

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“…Lattice QCD calculations [1,2] suggest that a transition from confined hadrons to a state of deconfined matter, the so-called quark-gluon plasma, is happening at temperatures above T c = (154±9) MeV and/or energy densities above c = 0.34±0.16 GeV/fm 3 . These are clearly reached in these collisions as one can deduce for instance from the measurement of direct photon transverse momentum spectra.…”

Section: Introductionmentioning

confidence: 99%

Recent results on strangeness from ALICE at LHC

Dönigus

2017

J. Phys.: Conf. Ser.

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Abstract. Recent measurements performed in high-multiplicity proton-proton (pp) and proton-lead (p-Pb) collisions have shown features that are similar to those observed in lead-lead (Pb-Pb) collisions. These observations warrant a comprehensive measurement of the production of identified particles as a function of multiplicity in all systems. The production of different strange and multi-strange particle species at mid-rapidity measured as a function of multiplicity in pp collisions at √ s = 7 TeV with the ALICE setup are conducted. Spectral shapes studied both for individual particles and via particle ratios such as (Λ/K 0 S ) as a function of pT exhibit an evolution with event multiplicity and the production rates of hyperons are observed to increase more strongly than those of non-strange hadrons. These phenomena are qualitatively similar to the ones observed in p-Pb and Pb-Pb collisions. The values in high-multiplicity pp and p-Pb collisions approach the ones in Pb-Pb. IntroductionUltra-relatvistic heavy-ion collisions at the LHC offer a unique way to study QCD matter at very high temperatures. Lattice QCD calculations [1,2] suggest that a transition from confined hadrons to a state of deconfined matter, the so-called quark-gluon plasma, is happening at temperatures above T c = (154±9) MeV and/or energy densities above c = 0.34±0.16 GeV/fm 3 . These are clearly reached in these collisions as one can deduce for instance from the measurement of direct photon transverse momentum spectra. These lead to effective temperatures of T ef f = (297 ± 12(stat) ± 41(syst)) MeV averaged over the collision, extracted through the slope of the spectra [3]. Comparisions to models lead to initial temperatures of up to 740 MeV [4].The evolution of the collisions themselves are imagined usually as a sequence of the following stages: two Lorentz contracted nuclei approach each other, they collide, and after a short time (less than 1fm/c) a quark-gluon plasma is formed which eventually expands, cools down and hadronizes. Finally the hadrons rescatter and freeze out. The temperature where the hadrons stop being produced is called chemical freeze-out temperature T ch and the temperature when the hadrons stop scattering is denoted as kinetic freeze-out temperature T f o .If one uses an analogy between a light source and a particle source one can extract also a temperature from the measured multiplicities of the different particle species. This is possible using an approach based on a grand canonical ensemble with the main ingredients: (chemical freeze-out) temperature T ch , volume V and baryo-chemical potential µ B . The latter is basically zero at the LHC, namely baryons and anti-baryons are produced with equal amounts [5]. This approach is called (statistical) thermal model and the measurement of the production yield of different particle species, such as π, K, p, etc. can be used to extract a temperature of about 156 MeV at the LHC [6]. If this is done for the different available energies at different

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Determination ofαsfrom the QCD static energy: An update

Cited by 191 publications

References 69 publications

B-meson decay constants: A more complete picture from full lattice QCD

B-meson decay constants: A more complete picture from full lattice QCD

Phase diagram and thermal properties of strong-interaction matter

Recent results on strangeness from ALICE at LHC

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