Nuclear Theory·nucl-th

Thursday·July 13, 2017

9 papers—4 primary·5 cross-listed

05
[Submitted on 11 Jul 2017] (cross-list from astro-ph.CO)
Anthropics of Aluminum-26 Decay and Biological Homochirality
McCullen Sandora🇺🇸
Results of recent experiment reinstate feasibility to the hypothesis that biomolecular homochirality originates from beta decay. Coupled with hints that this process occurred extraterrestrially suggests aluminum-26 as the most likely source. If true, then its appropriateness is highly dependent on the half-life and energy of this decay. Demanding that this mechanism hold places new constraints on the anthropically allowed range for multiple parameters, including the electron mass, difference between up and down quark masses, the fine structure constant, and the electroweak scale. These new constraints on particle masses are tighter than those previously found. However, one edge of the allowed region is nearly degenerate with an existing bound, which, using what is termed here as `the principle of noncoincident peril', is argued to be a strong indicator that the fine structure constant must be an environmental parameter in the multiverse.
Comments:
23 pages, 4 figures
Subjects:
Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
1707.03484 [pdf]
JCAP(2017)·3 citations
06
[Submitted on 12 Jul 2017] (cross-list from cond-mat.stat-mech)
Generalized Ensemble Theory with Non-extensive Statistics
Ke-Ming Shen🇨🇳 · Ben-Wei Zhang🇨🇳 · En-Ke Wang🇨🇳
The non-extensive canonical ensemble theory is reconsidered with the method of Lagrange multipliers by maximizing Tsallis entropy, with the constraint that the normalized term of Tsallis' $q -$ average of physical quantities, the sum $\sum p_{j}^{q}$ , is independent of the probability $p_{i}$ for Tsallis parameter $q$ . The self-referential problem in the deduced probability and thermal quantities in non-extensive statistics is thus avoided, and thermodynamical relationships are obtained in a consistent and natural way. We also extend the study to the non-extensive grand canonical ensemble theory and obtain the $q$ -deformed Bose-Einstein distribution as well as the $q$ -deformed Fermi-Dirac distribution. The theory is further applied to the generalized Planck law to demonstrate the distinct behaviors of the various generalized $q$ -distribution functions discussed in literature.
Comments:
14 pages, 2 figures
Subjects:
Statistical Mechanics (cond-mat.stat-mech); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th)
arXiv:
1707.03526 [pdf]
Physica A(2017)·8 citations
07
[Submitted on 12 Jul 2017] (cross-list from hep-ph)
Possible hadronic molecules composed of the doubly charmed baryon and nucleon
Lu Meng🇨🇳 · Ning Li🇩🇪 · Shi-lin Zhu🇨🇳
We perform a systematical investigation of the possible deuteron-like bound states with configuration $Ξ_{cc} N (N ˉ)$ , where $N (N ˉ)$ denotes the nucleon (anti-nucleon), in the framework of the one-boson-exchange-potential model. In the spin-triplet sector we take into account both the $^{3} S_{1}$ and $^{3} D_{1}$ channels due to non-vanishing tensor force. There exist several candidates of the loosely bound molecular states for the $Ξ_{cc} N$ and $Ξ_{cc} N ˉ$ systems, which lie below the threshold of $Λ_{c} Λ_{c}$ or $Λ_{c} Λ ˉ_{c}$ . We also investigate the possible loosely bound states with configurations $Λ_{c} N (N ˉ)$ and $Σ_{c} N (N ˉ)$ . These molecular candidates may be searched for at Belle II and LHC in the near future.
Comments:
14 pages, 5 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
1707.03598 [pdf]
EPJA(2018)·40 citations
08
[Submitted on 12 Jul 2017] (cross-list from hep-ph)
Probing medium-induced jet splitting and energy loss in heavy-ion collisions
Ning-Bo Chang🇨🇳 · Shanshan Cao🇺🇸 · Guang-You Qin🇨🇳
The nuclear modification of jet splitting in relativistic heavy-ion collisions at RHIC and the LHC energies is studied based on the higher twist formalism. Assuming coherent energy loss for the two splitted subjets, a non-monotonic jet energy dependence is found for the nuclear modification of jet splitting function: strongest modification at intermediate jet energies whereas weaker modification for larger or smaller jet energies. Combined with the smaller size and lower density of the QGP medium at RHIC than at the LHC, this explains the CMS-STAR groomed jet puzzle -- strong nuclear modification of the momentum sharing $z_{g}$ distribution at the LHC whereas no obvious modification of the $z_{g}$ distribution at RHIC. In contrast, the observed nuclear modification pattern of the groomed jet $z_{g}$ distribution cannot be explained solely by independent energy loss of the two subjets. Our result may be tested in future measurements of groomed jets with lower jet energies at the LHC and larger jet energies at RHIC, for different angular separations between the two subjets.
Comments:
10 pages, 12 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
1707.03767 [pdf]
PLB(2018)·73 citations
09
[Submitted on 12 Jul 2017] (cross-list from hep-ph)
Exotic Doubly Charmed Ds0*(2317)D and Ds1*(2460)D* Molecules
Mario Sanchez Sanchez🇫🇷 · Li-Sheng Geng🇨🇳 · Jun-Xu Lu🇨🇳 · Tetsuo Hyodo🇯🇵 · Manuel Pavon Valderrama🇨🇳
The $D_{s 0}^{*} (2317) D$ and $D_{s 1}^{*} (2460) D^{*}$ heavy meson systems can exchange a kaon that is emitted in S-wave owing to the opposite intrinsic parity of the $D_{s 0}^{*}$ ( $D_{s 1}^{*}$ ) and $D$ ( $D^{*}$ ) mesons. As a consequence of the mass difference of the $D_{s 0}^{*}$ ( $D_{s 1}^{*}$ ) and $D$ ( $D^{*}$ ) mesons, the range of the kaon exchange potential will be significantly longer than expected, corresponding to an effective mass of about $200 MeV$ . The potential will be very strong: the strength of the interaction is proportional to $(m_{D_{s 0}} - m_{D})^{2} / f_{π}^{2}$ and $(m_{D_{s 1}} - m_{D^{*}})^{2} / f_{π}^{2}$ . This combination of range and strength almost guarantees the existence of $D_{s 0}^{*} (2317) D$ and $D_{s 1}^{*} (2460) D^{*}$ bound states with $J^{P} = 0^{-}$ and $J^{P} = 0^{-}, 2^{-}$ respectively. Concrete calculations indicate a binding energy of $5 - 15 MeV$ independently of $J^{P}$ . The $D_{s 0}^{*} (2317) D$ and $D_{s 1}^{*} (2460) D^{*}$ molecules have manifestly exotic flavour quantum numbers: $C = 2$ , $S = 1$ and $I = 1/2$ . We expect the existence of bottom counterparts composed of the $B B_{s 0}$ and $B^{*} B_{s 1}^{*}$ mesons, which will be more bound and have a richer spectrum that might include a shallow P-wave state and an excited S-wave state.
Comments:
6 Pages, 1 Figure
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
1707.03802 [pdf]
PRD(2018)·40 citations

Affiliations

first authorsco-authorsvia INSPIRE

Anthropics of Aluminum-26 Decay and Biological Homochirality

Generalized Ensemble Theory with Non-extensive Statistics

Possible hadronic molecules composed of the doubly charmed baryon and nucleon

Probing medium-induced jet splitting and energy loss in heavy-ion collisions

Exotic Doubly Charmed Ds0*(2317)D and Ds1*(2460)D* Molecules

Affiliations

Exotic Doubly Charmed Ds0(2317)D and Ds1(2460)D* Molecules