Date: Thu, 28 May 20 00:29:15 GMT Subject: nucl-th daily 2 new + 5 crosses received by eprepget ------------------------------------------------------------------------------ ------------------------------------------------------------------------------ Send any comments regarding submissions directly to submitter. ------------------------------------------------------------------------------ Archives at http://arxiv.org/ To unsubscribe, e-mail To: nucl-th@arXiv.org, Subject: cancel ------------------------------------------------------------------------------ received by eprepget from Tue 26 May 20 18:00:00 GMT to Wed 27 May 20 18:00:00 GMT ------------------------------------------------------------------------------ \\ arXiv:2005.13196 Date: Wed, 27 May 2020 06:51:57 GMT (22kb) Title: Quasiparticle properties of a single alpha particle in cold neutron matter Authors: Eiji Nakano, Kei Iida, and Wataru Horiuchi Categories: nucl-th cond-mat.quant-gas hep-ph Comments: 16 pages, 3 figures \\ Light clusters such as alpha particles and deuterons are predicted to occur in hot nuclear matter as encountered in intermediate-energy heavy-ion collisions and protoneutron stars. To examine the in-medium properties of such light clusters, we consider a much simplified system in which like an impurity, a single alpha particle is embedded in a zero-temperature, dilute gas of non-interacting neutrons. By adopting a non-selfconsistent ladder approximation for the effective interaction between the impurity and the gas, which is often used for analyses of Fermi polarons in a gas of ultracold atoms, we calculate the quasiparticle properties of the impurity, i.e., the energy shift, effective mass, quasiparticle residue, and damping rate. \\ ( https://arxiv.org/abs/2005.13196 , 22kb) ------------------------------------------------------------------------------ \\ arXiv:2005.13197 Date: Wed, 27 May 2020 06:52:36 GMT (135kb,D) Title: Neutron skin of $^{48}$Ca consistent with experimental data on skins Authors: Shingo Tagami, Jun Matsui, Maya Takechi, Masanobu Yahiro Categories: nucl-th \\ [Background]: In our previous paper, we predicted $r_{\rm skin}$, $r_{\rm p}$, $r_{\rm n}$, $r_{\rm m}$ for $^{40-60,62,64}$Ca after determining the neutron dripline, using the Gogny-D1S HFB with and without the angular momentum projection (AMP). We found that effects of the AMP are small. Very lately, Tanaka {\it et al.} measured interaction cross sections $\sigma_{\rm I}$ for $^{42-51}$Ca, determined $r_{\rm m}$ from the $\sigma_{\rm I}$, and deduced skin $r_{\rm skin}$ and $r_{\rm n}$ from the $r_{\rm m}$ and the $r_{\rm p}(\rm {exp})$ evaluated from the electron scattering. Comparing our results with the data, we find for $^{42-48}$Ca that GHFB and GHFB+AMP reproduce the data on $r_{\rm skin}$, $r_{\rm n}$, $r_{\rm m}$, but not for $r_{\rm p}(\rm {exp})$. [Aim]: Our purpose is to determine a value of $r_{\rm skin}^{48}$ by using GHFB+AMP and the constrained GHFB (cGHFB) in which the calculated value is fitted to $r_{\rm p}(\rm {exp})$. [Results]: For $^{42,44,46,48}$Ca, cGHFB hardly changes $r_{\rm skin}$, $r_{\rm m}$, $r_{\rm n}$ calculated with GHFB+AMP, except for $r_{\rm skin}^{48}$. For $r_{\rm skin}^{48}$, the cGHFB result is $r_{\rm skin}^{48}=0.190$fm, while $r_{\rm skin}^{48}=0.159$fm for GHFB+AMP. We should take the upper and the lower bound of GHFB+AMP and cGHFB. The result $r_{\rm skin}^{48}=0.159-0.190$fm consists with the $r_{\rm skin}^{48}(\sigma_{\rm I})$ and the data $r_{\rm skin}^{48}(\rm $E1$pE)$ obtained from high-resolution $E1$ polarizability experiment ($E1$pE). Using the $r_{\rm skin}^{48}$-$r_{\rm skin}^{208}$ relation with strong correlation of Ref.[3], we transform the data $r_{\rm skin}^{208}$ determined by PREX and $E1$pE to the corresponding values, $r_{\rm skin}^{48}(\rm tPREX)$ and $r_{\rm skin}^{48}(\rm t$E1$pE)$. Our result is consistent also for $r_{\rm skin}^{48}(\rm tPREX)$ and $r_{\rm skin}^{48}(\rm t$E1$pE)$. \\ ( https://arxiv.org/abs/2005.13197 , 135kb) %-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%-%- ------------------------------------------------------------------------------ \\ arXiv:2005.12967 (*cross-listing*) Date: Tue, 26 May 2020 18:45:08 GMT (305kb,D) Title: $J/\psi$ meson production in association with an open charm hadron at the LHC: a reappraisal Authors: Hua-Sheng Shao Categories: hep-ph hep-ex nucl-ex nucl-th Comments: 31 pages, 19 figures, 7 tables \\ We critically (re)examine the associated production process of a $J/\psi$ meson plus an open charm hadron at the LHC in the proton-proton ($pp$) and proton-lead ($p{\rm Pb}$) collisions. Such a process is very intriguing in the sense of tailoring to explore the double parton structure of nucleons and to determine the geometry of partons in nuclei. In order to interpret the existing $pp$ data with the LHCb detector at the centre-of-mass energy $\sqrt{s}=7$ TeV, we introduce two overlooked mechanisms for the double parton scattering (DPS) and single parton scattering (SPS) processes. Besides the conventional DPS mode, where the two mesons are produced almost independently in the two separate scattering subprocesses, we propose a novel DPS mechanism that the two constituent (heavy) quarks stemming from two hard scatterings can form into a composite particle, like the $J/\psi$ meson, during the hadronisation phase. However, it turns out the corresponding contribution is small in $J/\psi+c\bar{c}$ hadroproduction. On the contrary, we point out that the resummation of the initial state logarithms due to gluon splitting into a charm quark pair is crucial to understand the LHCb measurement, which was overlooked in the literature. We perform a proper matching between the perturbative calculations in different initial-quark flavour number schemes, generically referring to the variable flavour number scheme. The new variable flavour number scheme calculation for the process strongly enhance the SPS cross sections, almost closing the discrepancies between theory and experiment. Finally, we present our predictions for the forthcoming LHCb measurement in $p{\rm Pb}$ collisions at $\sqrt{s_{NN}}=8.16$ TeV. Some interesting observables are exploited to set up the control regions of the DPS signal and to probe the impact-parameter dependent parton densities in lead. \\ ( https://arxiv.org/abs/2005.12967 , 305kb) ------------------------------------------------------------------------------ \\ arXiv:2005.13067 (*cross-listing*) Date: Tue, 26 May 2020 22:19:51 GMT (1738kb,D) Title: The Constituent Counting Rule and Omega Photoproduction Authors: Trevor Reed, Christopher Leon, Frank Vera, Lei Guo, and Brian Raue Categories: hep-ph nucl-ex nucl-th Comments: 6 pages, 7 figures \\ The constituent counting ruling (CCR) has been found to hold for numerous hard, exclusive processes. It predicts the differential cross section at high energies and fixed $\cos \theta_{c.m.}$ should follow $\frac{d \sigma}{dt} \sim \frac{1}{s^{n-2}}$, where $n$ is the minimal number of constituents involved in the reaction. Here we provide an in-depth analysis of the reaction $\gamma p \rightarrow \omega p$ at $\theta_{c.m.}\sim 90^\circ$ using CLAS data with an energy range of $s = 5 - 8$ GeV$^2$, where the CCR has been shown to work in other reactions. We argue for a stringent method to select data to test the CCR and utilize a Taylor-series expansion to take advantage of data from nearby angle bins in our analysis. Na\"{i}vely, this reaction would have $n=9$ (or $n=10$ if the photon is in a $q\bar{q}$ state) and we would expect a scaling of $\sim s^{-7}$ ($s^{-8}$). Instead, a scaling of $s^{-(9.08 \pm 0.11)}$ was observed. Explanations for this apparent failure of the na\"{i}ve CCR assumptions are examined. \\ ( https://arxiv.org/abs/2005.13067 , 1738kb) ------------------------------------------------------------------------------ \\ arXiv:2005.13136 (*cross-listing*) Date: Wed, 27 May 2020 02:48:34 GMT (3639kb) Title: Modified MIT Bag Models: Thermodynamical consistency, stability windows and symmetry group Authors: Luiz L. Lopes, Carline Biesdorf, D\'ebora P. Menezes Categories: hep-ph astro-ph.HE nucl-th Comments: 12 pages, 9 figures \\ In this work we study different variations of the MIT bag model. We start with the so called non-ideal bag model and discuss it in detail. Then we implement a vector interaction in the MIT bag model that simulates a meson exchange interaction and fix the quark-meson coupling constants via symmetry group theory. At the end we propose an original model, inspired by the Boguta-Bodmer models, which allows us to control the repulsion interaction at high densities. For each version of the model we obtain a stability window as predicted by the Bodmer-Witten conjecture and discuss its thermodynamical consistency. \\ ( https://arxiv.org/abs/2005.13136 , 3639kb) ------------------------------------------------------------------------------ \\ arXiv:2005.13233 (*cross-listing*) Date: Wed, 27 May 2020 08:30:38 GMT (11kb) Title: Conserved charges in general relativity Authors: Sinya Aoki, Tetsuya Onogi, Shuichi Yokoyama Categories: gr-qc hep-ph hep-th nucl-th Comments: 5 pages Report-no: YITP-20-59, OU-HET-1056 \\ We present a precise definition of a conserved quantity from an arbitrary covariantly conserved current available in a general curved spacetime. This definition enables us to define energy and momentum for matter by the volume integral. As a result we can compute charges of well-known black holes just as an electric charge of an electron in electromagnetism by the volume integration of a delta function singularity. As a byproduct we show that the definition leads to a correction to the known mass formula of a compact star in the Oppenheimer-Volkoff equation. We finally comment on a definition of generators associated with a vector field on a general curved manifold. \\ ( https://arxiv.org/abs/2005.13233 , 11kb) ------------------------------------------------------------------------------ \\ arXiv:2005.13340 (*cross-listing*) Date: Wed, 27 May 2020 13:09:30 GMT (4697kb,D) Title: Measurement of the $^{229}$Th isomer energy with a magnetic micro-calorimeter Authors: Tomas Sikorsky, Jeschua Geist, Daniel Hengstler, Sebastian Kempf, Loredana Gastaldo, Christian Enss, Christoph Mokry, J\"org Runke, Christoph E. D\"ullmann, Peter Wobrauschek, Kjeld Beeks, Veronika Rosecker, Johannes H. Sterba, Georgy Kazakov, Thorsten Schumm and Andreas Fleischmann Categories: nucl-ex nucl-th physics.ins-det Comments: 5 pages, 5 figures + supplementary \\ We present a measurement of the low-energy (0--60$\,$keV) $\gamma$ ray spectrum produced in the $\alpha$-decay of $^{233}$U using a dedicated cryogenic magnetic micro-calorimeter. The energy resolution of $\sim$$10\,$eV, together with exceptional gain linearity, allow us to measure the energy of the low-lying isomeric state in $^{229}$Th using four complementary evaluation schemes. The most accurate scheme determines the $^{229}$Th isomer energy to be $8.10(17)\,$eV, corresponding to 153.1(37)$\,$nm, superseding in precision previous values based on $\gamma$ spectroscopy, and agreeing with a recent measurement based on internal conversion electrons. We also measure branching ratios of the relevant excited states to be $b_{29}=9.3(6)\%$ and $b_{42}=0.3(3)\%$. \\ ( https://arxiv.org/abs/2005.13340 , 4697kb) %%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%%--%% ------------------------------------------------------------------------------ \\ arXiv:1907.11430 replaced with revised version Wed, 27 May 2020 09:55:33 GMT (66kb,D) Title: The effect of Confined One Gluon Exchange Potential and Instanton Induced Interaction in Nucleon-Nucleon Interaction Authors: Raghavendra S., Vanamali C. Shastry, Nilakanthan V. K., and Vijaya Kumar K. B Categories: nucl-th Comments: 8 pages, 6 figures Journal-ref: Commun. Theor. Phys. 72 (2020) 065301 DOI: 10.1088/1572-9494/ab8930 \\ ( https://arxiv.org/abs/1907.11430 , 66kb) ------------------------------------------------------------------------------ \\ arXiv:1908.05424 replaced with revised version Wed, 27 May 2020 17:53:37 GMT (4225kb,D) Title: Ab Initio Treatment of Collective Correlations and the Neutrinoless Double Beta Decay of $^{48}$Ca Authors: J. M. Yao, B. Bally, J. Engel, R. Wirth, T. R. Rodr\'iguez, and H. Hergert Categories: nucl-th hep-ph nucl-ex Comments: 6 pages, 4 figures and 1 table. supplementary material included. version to be published \\ ( https://arxiv.org/abs/1908.05424 , 4225kb) ------------------------------------------------------------------------------ \\ arXiv:1908.08790 (*cross-listing*) replaced with revised version Wed, 27 May 2020 04:17:18 GMT (1903kb,D) Title: Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners Authors: Yasuhiro Yamaguchi, Atsushi Hosaka, Sachiko Takeuchi, Makoto Takizawa Categories: hep-ph nucl-th Comments: 75 pages, 21 figures, minor revisions, version published in J. Phys. G: Nucl. Part. Phys Report-no: RIKEN-QHP-425 Journal-ref: J. Phys. G: Nucl. Part. Phys. 47 (2020) 053001 DOI: 10.1088/1361-6471/ab72b0 \\ ( https://arxiv.org/abs/1908.08790 , 1903kb) ------------------------------------------------------------------------------ \\ arXiv:1911.13216 (*cross-listing*) replaced with revised version Wed, 27 May 2020 16:10:40 GMT (6289kb,D) Title: Effects of oscillating spacetime metric background on a complex scalar field and formation of topological vortices Authors: Shreyansh S. Dave, and Sanatan Digal Categories: hep-th astro-ph.HE cond-mat.quant-gas hep-ph nucl-th Comments: 14 pages, 13 figures \\ ( https://arxiv.org/abs/1911.13216 , 6289kb) ------------------------------------------------------------------------------ \\ arXiv:2001.07040 replaced with revised version Tue, 26 May 2020 22:25:48 GMT (827kb,D) Title: How to renormalize integral equations with singular potentials in effective field theory Authors: E. Epelbaum, A. M. Gasparyan, J. Gegelia, Ulf-G. Mei{\ss}ner, and X.-L. Ren Categories: nucl-th hep-ph hep-th Comments: 9 pages, 2 figures, extends the discussion, matches published version in EPJA Journal-ref: Eur. Phys. J. A 56 (2020) 152 DOI: 10.1140/epja/s10050-020-00162-4 \\ ( https://arxiv.org/abs/2001.07040 , 827kb) ------------------------------------------------------------------------------ \\ arXiv:2001.10235 (*cross-listing*) replaced with revised version Wed, 27 May 2020 15:09:57 GMT (564kb,D) Title: In-beam gamma-ray and electron spectroscopy of $^{249,251}$Md Authors: R. Briselet, Ch. Theisen, B. Sulignano, M. Airiau, K. Auranen, D. M. Cox, F. D\'echery, A. Drouart, Z. Favier, B. Gall, T. Goigoux, T. Grahn, P. T. Greenlees, K. Hauschild, A. Herzan, R.-D. Herzberg, U. Jakobsson, R. Julin, S. Juutinen, J. Konki, M. Leino, A. Lopez-Martens, A. Mistry, P. Nieminen, J. Pakarinen, P. Papadakis, P. Peura, P. Rahkila, E. Rey-Herme, J. Rubert, P. Ruotsalainen, M. Sandzelius, J. Sar\'en, C. Scholey, J. Sorri, S. Stolze, J. Uusitalo, M. Vandebrouck, A. Ward, M. Zieli\'nska, B. Bally, M. Bender, and W. Ryssens Categories: nucl-ex nucl-th \\ ( https://arxiv.org/abs/2001.10235 , 564kb) ------------------------------------------------------------------------------ \\ arXiv:2002.11348 (*cross-listing*) replaced with revised version Wed, 27 May 2020 03:02:50 GMT (85kb) Title: Chiral Radiation Transport Theory of Neutrinos Authors: Naoki Yamamoto and Di-Lun Yang Categories: astro-ph.HE hep-ph nucl-th Comments: 21 pages, no figures, very minor revisions, journal version Journal-ref: Astrophys.J. 895 (2020) 1 DOI: 10.3847/1538-4357/ab8468 \\ ( https://arxiv.org/abs/2002.11348 , 85kb) %%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%---%%%--- For subscribe options to combined physics archives, e-mail To: physics@arxiv.org, Subject: subscribe ----------------------------------------------------------------------------- For help on viewing and making submissions, see http://arxiv.org/help/