Nuclear Theory·nucl-th

Friday·December 11, 2015

11 papers—7 primary·4 cross-listed

08
Observational signatures of neutron stars in low-mass X-ray binaries climbing a stability peak
Elena Kantor · Mikhail Gusakov · Andrey Chugunov
In the recent papers by Gusakov, Chugunov, and Kantor (2014) a new scenario describing evolution of rapidly rotating neutron stars in low-mass X-ray binaries was proposed. The scenario accounts for a resonant interaction of normal r modes with superfluid inertial modes at some specific internal stellar temperatures ("resonance temperatures"). This interaction results in an enhanced damping of r mode and appearance of the "stability peaks" in the temperature -- spin frequency plane, which split the r-mode instability window in the vicinity of the resonance temperatures. The scenario suggests that the hot and rapidly rotating NSs spend most of their life climbing up these peaks and, in particular, are observed there at the moment. We analyze in detail possible observational signatures of this suggestion. In particular, we show that these objects may exhibit `anti-glitches' -- sudden frequency jumps on a time scale of hours-months.
↳ astro-ph.SRastro-ph.HEgr-qcnucl-thMNRAS(2016)·14 citations
09
Spectra and elliptic flow of charmed hadrons in HYDJET++ model
G. Eyyubova (SINP, Moscow & Prague, Tech. U.)🇷🇺 · I.P. Lokhtin (SINP, Moscow)🇷🇺 · A.V. Belyaev (SINP, Moscow)🇷🇺 · G. Ponimatkin🇨🇿 · E. Yu. Pronina (SINP, Moscow)🇷🇺
Heavy-flavour quarks are predominantly produced in hard scatterings on a short time-scale and traverse the medium interacting with its constituents, thus they are one of the effective probes of the transport properties of the medium formed in relativistic heavy ion collisions. On the other hand, the thermal production of heavy-flavour quarks in quark-gluon plasma (QGP) is itself of interest. In this report, the production and elliptic flow of the prompt charmed mesons $D^{0}$ , $D^{+}$ , $D^{*+}$ and $J / ψ$ in PbPb collisions at the center-of-mass energy 2.76 TeV per nucleon pair are described in the framework of two-component HYDJET++ model. The model combines thermal and pQCD production mechanisms. The spectra and elliptic flow of charmed mesons are presented, the results are compared with LHC data.
↳ hep-phnucl-thPoS(2015)·0 citations
10
Compositeness of Hadron Resonances and Quasi-Bound States
Tetsuo Hyodo🇯🇵
We discuss the composite nature of hadrons appearing near the s-wave two-hadron threshold. Generalizing the Weinberg's weak-binding relation for stable bound states, we show that the compositeness of near-threshold resonances and quasi-bound states can be determined by observable quantities.
↳ hep-phnucl-thJPS Conf.Proc.(2017)·0 citations
11
Understanding the Nature of $Λ (1405)$ through Regge Physics
Cesar Fernandez-Ramirez🇺🇸 · Igor V. Danilkin🇩🇪 · Vincent Mathieu🇺🇸 · Adam P. Szczepaniak🇺🇸
It appears that there are two resonances with $J^{P} = 1/ 2^{-}$ quantum numbers in the energy region near the $Λ (1405)$ hyperon. The nature of these states is a topic of current debate. To provide further insight we use Regge phenomenology to access how these two resonances fit the established hyperon spectrum. We find that only one of these resonances is compatible with a three-quark state.
↳ hep-phnucl-thPRD(2016)·36 citations

Affiliations

first authorsco-authorsvia INSPIRE

Observational signatures of neutron stars in low-mass X-ray binaries climbing a stability peak

Spectra and elliptic flow of charmed hadrons in HYDJET++ model

Compositeness of Hadron Resonances and Quasi-Bound States

Understanding the Nature of Λ(1405) through Regge Physics

Affiliations

Understanding the Nature of $Λ (1405)$ through Regge Physics