Nuclear Theory·nucl-th

Tuesday·November 8, 2016

12 papers—7 primary·5 cross-listed

08
Nonlocal wave turbulence in non-Abelian plasmas
Yacine Mehtar-Tani🇺🇸
We investigate driven wave turbulence in non-Abelian plasmas, in the framework of kinetic theory where both elastic and inelastic processes are considered in the small angle approximation. The gluon spectrum, that forms in the presence of a steady source, is shown to be controlled by nonlocal interactions in momentum space, in contrast to the universal Kolmogorov-Zakharov spectra. Assuming strongly nonlocal interactions, we show that inelastic processes are dominant in the IR and cause a thermal bath to form below the forcing scale, as a result of a detailed balance between radiation and absorption of soft gluons by the hard ones. Above the forcing scale, the inelastic collision term reduces to an inhomogeneous diffusion-like equation yielding a spectrum that spreads to the UV as $t^{1/2}$ , similarly to elastic processes. Due to nonlocal interactions the non-universal turbulent spectrum is not steady and flattens when time goes on toward the thermal distribution. This analysis is complemented by numerical simulations, where we observe that in the explored time interval the spectral exponent of the nonlocal turbulent cascade is close to $- 2$ in agreement with simulations of classical Yang-Mills equations.
↳ hep-phnlin.CDnucl-thNPA(2017)·4 citations
09
Jets and high- $p_{T}$ probes measured in the STAR experiment
Nihar Ranjan Sahoo (for the STAR collaboration)🇺🇸
Hard probes created through large momentum transfers are used to study the properties of QCD matter created in heavy-ion collisions, by comparing the measurements to those in p+p collisions. Jets, and the "quenching" or suppression of jets in the medium created in heavy-ion collisions, are studied through various different observables. We present the most recent measurements from $s_{N N}$ = 200 GeV Au+Au collisions, with p+p collisions as the reference, by the STAR Collaboration. The observables are semi-inclusive charged jets and di-jet transverse momentum imbalance. Additionally, correlation measurements of direct photon-hadron and neutral pion-hadron are presented and discussed.
↳ nucl-exhep-exhep-phnucl-thPoS(2016)·0 citations
10
In-medium bound-state formation and inhomogeneous condensation in Fermi gases in a hard-wall box
Dietrich Roscher · Jens Braun
The formation of bosonic bound states underlies the formation of a superfluid ground state in the many-body phase diagram of ultracold Fermi gases. We study bound-state formation in a spin- and mass-imbalanced ultracold Fermi gas confined in a box with hard-wall boundary conditions. Because of the presence of finite Fermi spheres, the center-of-mass momentum of the potentially formed bound states can be finite, depending on the parameters controlling mass and spin imbalance as well as the coupling strength. We exploit this observation to estimate the potential location of inhomogeneous phases in the many-body phase diagram as a function of spin- and mass imbalance as well as the box size. Our results suggest that a hard-wall box does not alter substantially the many-body phase diagram calculated in the thermodynamic limit. Therefore, such a box may serve as an ideal trap potential to bring experiment and theory closely together and facilitate the search for exotic inhomogeneous ground states.
↳ cond-mat.quant-gascond-mat.supr-connucl-thJ.Phys.B(2017)·3 citations
11
The fourth dimension of the nucleon structure: spacetime analysis of the timelike electromagnetic proton form factors
Andrea Bianconi🇮🇹 · Egle Tomasi-Gustafsson🇫🇷
As well known, spacelike proton form factors expressed in the Breit frame may be interpreted as the Fourier transform of static space distributions of electric charge and current. In particular, the electric form factor is simply the Fourier transform of the charge distribution $F (q) = \int e^{i q \cdot r} ρ (r) d^{3} r$ . We don't have an intuitive interpretation of the same level of simplicity for the proton timelike form factor appearing in the reactions $e^{+} e^{-} \leftrightarrow p ˉ p$ . However, one may suggest that in the center of mass (CM) frame, where $q_{μ} x^{μ} = q t$ , a timelike electric form factor is the Fourier transform $F (q) = \int e^{i q t} R (t) d t$ of a function $R (t)$ expressing how the electric properties of the forming (or annihilating) proton-antiproton pair evolve in time. Here we analyze in depth this idea, show that the functions $ρ (r)$ and $R (t)$ can be formally written as the time and space integrals of a unique correlation function depending on both time and space coordinates.
↳ hep-phnucl-thPRC(2017)·9 citations
12
Applications of KP Nuclear Parton Distributions
Sergey Kulagin🇷🇺 · Roberto Petti🇺🇸
We review the nuclear parton distribution functions computed on the basis of our microscopic model taking into account a number of nuclear effects including Fermi motion and nuclear binding, nuclear meson-exchange currents, off-shell corrections to bound nucleon distributions and nuclear shadowing. We discuss applications to a number of different processes including lepton-nucleus deep inelastic scattering, proton-nucleus Drell-Yan lepton pair production at Fermilab, as well as $W^{\pm}$ and $Z^{0}$ boson production in proton-lead collisions at the LHC.
↳ hep-phhep-exnucl-exnucl-thPoS(2016)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Nonlocal wave turbulence in non-Abelian plasmas

Jets and high-pT​ probes measured in the STAR experiment

In-medium bound-state formation and inhomogeneous condensation in Fermi gases in a hard-wall box

The fourth dimension of the nucleon structure: spacetime analysis of the timelike electromagnetic proton form factors

Applications of KP Nuclear Parton Distributions

Affiliations

Jets and high- $p_{T}$ probes measured in the STAR experiment