Nuclear Theory·nucl-th

Wednesday·January 6, 2016

8 papers—4 primary·4 cross-listed

05
Calculating Masses of Pentaquarks Composed of Baryons and Mesons
Majid Monemzadeh🇮🇷 · Narges Tazimi🇮🇷 · Shahnaz Babaghodrat🇮🇷
In this paper, we consider an exotic baryon (pentaquark) as a bound state of two-particle systems composed of a baryon (nucleon) and a meson.We used a baryon - meson picture to reduce a complicated five-body problem to a simple two-body problems. The homogeneous Lippmann-Schwinger integral equation is solved in configuration space by using one pion exchange potential. We calculate the masses of pentaquarks $θ_{c} (uu dd c ˉ)$ , $θ_{b} (uu dd b ˉ)$ .
↳ hep-phnucl-thAdv.High Energy Phys.(2016)·14 citations
06
Charmed meson and charmonium production in PbPb collisions at the LHC
I.P. Lokhtin🇷🇺 · A.V. Belyaev🇷🇺 · G.Kh. Eyyubova🇨🇿 · G. Ponimatkin🇨🇿 · E.Yu. Pronina🇷🇺
The phenomenological analysis of various characteristics of $J / ψ$ and $D$ meson production in PbPb collisions at the center-of-mass energy 2.76 TeV per nucleon pair is presented. The data on momentum spectra and elliptic flow are reproduced by two-component model HYDJET++ including thermal and non-thermal charm production mechanisms. The significant part of $D$ -mesons is found to be in a kinetic equilibrium with the created medium, while $J / ψ$ -mesons are characterized by earlier (as compared to light hadrons) freeze-out.
↳ hep-phnucl-thJ.Phys.G(2016)·14 citations
07
Resonance on top of thresholds: the $Λ_{c} (2595)^{+}$ as an extremely fine-tuned state
Zhi-Hui Guo🇨🇳 · J.A. Oller🇪🇸
A dedicated study of the $π Σ_{c}$ scattering around its threshold is carried out in this work to probe the nature of $Λ_{c} (2595)^{+}$ . We first demonstrate that the effective range expansion approach fails to work near the $Λ_{c} (2595)^{+}$ pole position, due to the presence of a nearby CDD pole around the $π Σ_{c}$ thresholds. We then develop a general framework to properly handle the situation with a CDD pole accompanied by nearby thresholds, which is first elaborated for the single-channel case and then generalized to the coupled-channel study. The isospin breaking effects of the three $π Σ_{c}$ channels with different thresholds are specially taken into account in our study. The finite-width effects from the $Σ_{c}$ baryons are considered and found to be relevant to give the $Λ_{c} (2595)^{+}$ width fully compatible to its experimental value. Through the compositeness analysis, our robust conclusion is that the $π^{0} Σ_{c}^{+}$ component is subdominant inside the $Λ_{c} (2595)^{+}$ .
↳ hep-phhep-exhep-latnucl-thPRD(2016)·43 citations
08
Charge-dependent correlations from event-by-event anomalous hydrodynamics
Yuji Hirono🇺🇸 · Tetsufumi Hirano🇯🇵 · Dmitri E. Kharzeev🇺🇸
We report on our recent attempt of quantitative modeling of the Chiral Magnetic Effect (CME) in heavy-ion collisions. We perform 3+1 dimensional anomalous hydrodynamic simulations on an event-by-event basis, with constitutive equations that contain the anomaly-induced effects. We also develop a model of the initial condition for the axial charge density that captures the statistical nature of random chirality imbalances created by the color flux tubes. Basing on the event-by-event hydrodynamic simulations for hundreds of thousands of collisions, we calculate the correlation functions that are measured in experiments, and discuss how the anomalous transport affects these observables.
↳ hep-phnucl-exnucl-thNPA(2016)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE

Calculating Masses of Pentaquarks Composed of Baryons and Mesons

Charmed meson and charmonium production in PbPb collisions at the LHC

Resonance on top of thresholds: the Λc​(2595)+ as an extremely fine-tuned state

Charge-dependent correlations from event-by-event anomalous hydrodynamics

Affiliations

Resonance on top of thresholds: the $Λ_{c} (2595)^{+}$ as an extremely fine-tuned state