Nuclear Theory·nucl-th

Wednesday·March 27, 2019

6 papers—3 primary·3 cross-listed

04
Impact of the chromo-electromagnetic field fluctuations on transport coefficients of heavy quarks and shear viscosity to entropy density ratio of quark-gluon plasma
Ashik Ikbal Sheikh🇮🇳 · Zubayer Ahammed🇮🇳
The chromo-electromagnetic field fluctuations in the quark-gluon plasma (QGP) play an important role as these field fluctuations result energy gain of heavy quarks. We consider these fluctuations and evaluate the transport coefficients, e.g., drag and diffusion coefficients of charm quarks and shear viscosity to entropy density ratio ( $η / s$ ) of the QGP. We find a significant effect of such fluctuations on the transport coefficients. These fluctuations cause a reduction of the drag and diffusion coefficients. We also observe that the shear viscosity to entropy density ratio of the QGP is closer to the value obtained in Lattice QCD (LQCD) and functional renormalization group calculations when the effects of such fluctuations are included.
↳ hep-phnucl-thNPA(2019)·2 citations
05
Structure Functions of the Nucleon in a Soliton Model
I. Takyi🇿🇦 · H. Weigel🇿🇦
We study nucleon structure functions in the soliton picture of the bosonized Nambu-Jona-Lasinio model. We focus on their vacuum contributions and examine whether they are outweighed by their valence quark counterparts.
↳ hep-phnucl-thJPS Conf.Proc.(2019)·1 citation
06
Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks
Rui Chen🇨🇳 · Zhi-Feng Sun🇨🇳 · Xiang Liu🇨🇳 · Shi-Lin Zhu🇨🇳
On March 26th, 2019, at the Rencontres de Moriond QCD conference, the LHCb Collaboration reported the observation of three new pentaquarks, namely $P_{c} (4312)$ , $P_{c} (4440)$ and $P_{c} (4457)$ , which are consistent with the loosely bound molecular hidden-charm pentaquark states composed of an S-wave charmed baryon $Σ_{c}$ and an S-wave anti-charmed meson ( $D ˉ, D ˉ^{*}$ ). In this work, we present a direct calculation by the one-boson-exchange (OBE) model and demonstrate explicitly that the $P_{c} (4312)$ , $P_{c} (4440)$ and $P_{c} (4457)$ do correspond to the loosely bound $Σ_{c} D ˉ$ with $(I = 1/2, J^{P} = 1/ 2^{-})$ , $Σ_{c} D ˉ^{*}$ with $(I = 1/2, J^{P} = 1/ 2^{-})$ and $Σ_{c} D ˉ^{*}$ with $(I = 1/2, J^{P} = 3/ 2^{-})$ , respectively.
↳ hep-phhep-exhep-latnucl-thPRD(2019)·261 citations

Affiliations

first authorsco-authorsvia INSPIRE

Impact of the chromo-electromagnetic field fluctuations on transport coefficients of heavy quarks and shear viscosity to entropy density ratio of quark-gluon plasma

Structure Functions of the Nucleon in a Soliton Model

Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks

Affiliations