Nuclear Theory·nucl-th

Friday·June 9, 2017

9 papers—5 primary·4 cross-listed

06
[Submitted on 22 May 2017] (cross-list from hep-ph)
Renormalized quark-antiquark Hamiltonian induced by a gluon mass ansatz in heavy-flavor QCD
Stanisław D. Głazek🇵🇱 · María Gómez-Rocha🇮🇹 · Jai More🇮🇳 · Kamil Serafin🇵🇱
In response to the growing need for theoretical tools that can be used in QCD to describe and understand the dynamics of gluons in hadrons in the Minkowski space-time, the renormalization group procedure for effective particles (RGPEP) is shown in the simplest available context of heavy quarkonia to exhibit a welcome degree of universality in the first approximation it yields once one assumes that beyond perturbation theory gluons obtain effective mass. Namely, in the second-order terms, the Coulomb potential with Breit-Fermi spin couplings in the effective quark-antiquark component of a heavy quarkonium, is corrected in one-flavor QCD by a spin-independent harmonic oscillator term that does not depend on the assumed effective gluon mass or the choice of the RGPEP generator. The new generator we use here is much simpler than the ones used before and has the advantage of being suitable for studies of the effective gluon dynamics at higher orders than the second and beyond the perturbative expansion.
Comments:
8 pages, 2 figures, journal version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
1705.07629 [pdf]
PLB(2017)·35 citations
07
[Submitted on 8 Jun 2017] (cross-list from hep-ph)
On neutrino production of a charmed meson
J. Wagner🇵🇱 · B. Pire🇫🇷 · L. Szymanowski🇵🇱
We calculate in the framework of the collinear QCD approach the amplitude for exclusive neutrino-production of a pseudoscalar charmed $D$ meson. This process allows to access gluon and both chiral-odd and chiral-even quark generalized parton distributions (GPDs), which contribute in specific ways to the amplitude for different polarization states of the $W$ boson. The energy dependence of the cross section allows to separate different contributions and the measurement of the azimuthal dependence helps to single out the transversity chiral-odd GPDs contributions. The flavor dependence, and in particular the difference between $D^{+}$ and $D^{0}$ production rates, allows to test the importance of gluonic contributions. The behaviour of the proton and neutron target cross sections enables to separate the $u$ and $d$ quark contributions. Planned medium and high energy neutrino facilities will thus allow some important progress in the realm of hadronic physics.
Comments:
5 pages, 8 figures, contribution to DIS 2017, XXV International Workshop on Deep-Inelastic Scattering and Related Subjects, 3-7 April 2017, University of Birmingham, UK
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1706.02461 [pdf]
PoS(2018)·1 citation
08
[Submitted on 8 Jun 2017] (cross-list from hep-ph)
Heavy Baryon-Antibaryon Molecules in Effective Field Theory
Jun-Xu Lu🇨🇳 · Li-Sheng Geng🇨🇳 · Manuel Pavon Valderrama🇨🇳
We discuss the effective field theory description of bound states composed of a heavy baryon and antibaryon. This framework is a variation of the ones already developed for heavy meson-antimeson states to describe the $X (3872)$ or the $Z_{c}$ and $Z_{b}$ resonances. We consider the case of heavy baryons for which the light quark pair is in S-wave and we explore how heavy quark spin symmetry constrains the heavy baryon-antibaryon potential. The one pion exchange potential mediates the low energy dynamics of this system. We determine the relative importance of pion exchanges, in particular the tensor force. We find that in general pion exchanges are probably non-perturbative for the $Σ_{Q} Σ ˉ_{Q}$ , $Σ_{Q}^{*} Σ ˉ_{Q}$ and $Σ_{Q}^{*} Σ ˉ_{Q}^{*}$ systems, while for the $Ξ_{Q}^{'} Ξ ˉ_{Q}^{'}$ , $Ξ_{Q}^{*} Ξ ˉ_{Q}^{'}$ and $Ξ_{Q}^{*} Ξ ˉ_{Q}^{*}$ cases they are perturbative If we assume that the contact-range couplings of the effective field theory are saturated by the exchange of vector mesons, we can estimate for which quantum numbers it is more probable to find a heavy baryonium state. The most probable candidates to form bound states are the isoscalar $Λ_{Q} Λ ˉ_{Q}$ , $Σ_{Q} Σ ˉ_{Q}$ , $Σ_{Q}^{*} Σ ˉ_{Q}$ and $Σ_{Q}^{*} Σ ˉ_{Q}^{*}$ and the isovector $Λ_{Q} Σ ˉ_{Q}$ and $Λ_{Q} Σ ˉ_{Q}^{*}$ systems, both in the hidden-charm and hidden-bottom sectors. Their doubly-charmed and -bottom counterparts ( $Λ_{Q} Λ_{Q}$ , $Λ_{Q} Σ_{Q}^{(*)}$ , $Σ_{Q}^{(*)} Σ_{Q}^{(*)}$ ) are also good candidates for binding.
Comments:
38 pages, 1 figure, 12 tables; extended discussion on the most probable molecular heavy baryon-antibaryon states to bind; corresponds to published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
1706.02588 [pdf]
PRD(2019)·54 citations
09
[Submitted on 8 Jun 2017] (cross-list from hep-ph)
Nuclear-bound quarkonia and heavy-flavor hadrons
G. Krein🇧🇷 · A.W. Thomas🇦🇺 · K. Tsushima🇧🇷
In our quest to win a deeper understanding of how QCD actually works, the study of the binding of heavy quarkonia and heavy-flavor hadrons to atomic nuclei offers enormous promise. Modern experimental facilities such as FAIR, Jefferson Lab at 12 GeV and J-PARC offer exciting new experimental opportunities to study such systems. These experimental advances are complemented by new theoretical approaches and predictions, which will both guide these experimental efforts and be informed and improved by them. This review will outline the main theoretical approaches, beginning with QCD itself, summarize recent theoretical predictions and relate them both to past experiments and those from which we may expect results in the near future.
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1706.02688 [pdf]
PPNP(2018)·126 citations

Affiliations

first authorsco-authorsvia INSPIRE

Renormalized quark-antiquark Hamiltonian induced by a gluon mass ansatz in heavy-flavor QCD

On neutrino production of a charmed meson

Heavy Baryon-Antibaryon Molecules in Effective Field Theory

Nuclear-bound quarkonia and heavy-flavor hadrons

Affiliations