Thu·Sep 27, 2018Thursday·September 27, 2018

1. 01*

   The Proton Radius Puzzle- Why We All Should Care

   Gerald A. Miller🇺🇸

   The status of the proton radius puzzle (as of the date of the Confer- ence) is reviewed. The most likely potential theoretical and experimental explanations are discussed. Either the electronic hydrogen experiments were not sufficiently accurate to measure the proton radius, the two- photon exchange effect was not properly accounted for, or there is some kind of new physics. I expect that upcoming experiments will resolve this issue within the next year or so.Ta

   ↳ physics.atom-phhep-phnucl-exnucl-th2 citations
2. 02*

   Evolution of the moments of multiplicity distributions

   Radka Sochorova🇨🇿 · Boris Tomasik🇸🇰 · Marcus Bleicher🇩🇪

   Measured moments of the multiplicity distribution for a given sort of particles are used in the literature for the determination of the phase transition parameters of hot QCD matter in ultrarelativistic heavy-ion collisions. We argue that the subsequent cooling in the hadronic phase, however, may drive the multiplicity distribution out of equilibrium. We use a master equation for the description of the evolution of the multiplicity distribution to demonstrate how the different moments depart away from their equilibrium values. If such moments were measured and interpreted as if they were equilibrated, one would obtain different apparent temperatures from different moments.

   ↳ nucl-thhep-phnucl-exPRC(2018)·5 citations
3. 03*

   Fully coupled-channel study of $K^{-}pp$ resonance in a chiral SU(3)-based $K^{bar}N$ potential

   Akinobu Doté🇯🇵 · Takashi Inoue🇯🇵 · Takayuki Myo🇯🇵

   Nuclear system with antikaons, so-called kaonic nuclei, has been a longstanding issue in strange nuclear physics and hadron physics, because they might have exotic nature; In particular, they could be a doorway to the dense matter due to the strong attraction between antikaon and nucleon. Among kaonic nuclei, the three-body system composed of two protons and a single $K^{-}$ meson, $K^{-}pp$, is the most essential. In this article, we will report on the recent situation of $K^{-}pp$ studies in both theoretical and experimental sides. Afterwards, we will explain our latest study of the $K^{-}pp$ with a fully coupled-channel complex scaling method (Full ccCSM) using a chiral SU(3)-based $\bar{K}N$(-$\pi Y$) potential. In Full ccCSM, the $K^{-}pp$ is completely treated as a resonant state of a $\bar{K}NN$-$\pi \Sigma N$-$\pi \Lambda N$ coupled-channel system. The energy dependence involved in the chiral potential is handled with a self-consistent calculation in which two extreme ansatzes are examined: field picture and particle picture. With our chiral SU(3)-based potential constrained by the precise data of kaonic hydrogen atom (SIDDHARTA experiment), the $K^{-}pp$ resonance is obtained as a shallowly bound state measured from the $\bar{K}NN$ threshold with a narrow width, if the field picture is employed in the calculation: the binding energy is $14-28$ MeV and half value of the mesonic decay width are $8-15$ MeV. On the other hand, if the particle picture is employed, it is found that the binding energy could be as large as about 50 MeV, even though such a chiral potential is used. Based on these results of Full ccCSM calculation, we have discussed on the possibility for kaonic nuclei to form a dense matter and on the latest experimental result reported by J-PARC E15 collaboration.

   ↳ nucl-thnucl-exAIP Conf.Proc.(2019)·1 citation
4. 04*

   Latest Updates from the AlCap Experiment

   Andrew Edmonds🇺🇸

   The AlCap experiment is a joint venture between the COMET and Mu2e collaborations that will measure the rate and spectrum of particles emitted after nuclear muon capture on aluminium. Both collaborations will search for the charged lepton flavour violating process of neutrinoless muon-to-electron conversion by stopping muons in an aluminium target. Knowledge of other particles emitted during this process is important. The AlCap charged particle emission data was collected at the Paul Scherrer Institut in Switzerland over two runs in 2013 and 2015. In this talk, the experiment will be described and the current status will be presented.

   ↳ physics.ins-detnucl-ex2 citations
5. 05*

   A beam-beam monitoring detector for the MPD experiment at NICA

   Mauricio Alvarado🇲🇽 · Alejandro Ayala🇲🇽 · Marco Alberto Ayala-Torres🇲🇽 · Wolfgang Bietenholz🇲🇽 · Isabel Dominguez🇲🇽 · Marcos Fontaine🇲🇽 · P. González-Zamora🇲🇽 · Luis Manuel Montaño🇲🇽 · E. Moreno-Barbosa🇲🇽 · Miguel Enrique Patiño Salazar🇲🇽 · L. A. P. Moreno🇲🇽 · P.A. Nieto-Marín🇲🇽 and 6 other authors

   The Multi-Purpose Detector (MPD) is to be installed at the Nuclotron Ion Collider fAcility (NICA) of the Joint Institute for Nuclear Research (JINR). Its main goal is to study the phase diagram of the strongly interacting matter produced in heavy-ion collisions. These studies, while providing insight into the physics of heavy-ion collisions, are relevant for improving our understanding of the evolution of the early Universe and the formation of neutron stars. In order to extend the MPD trigger capabilities, we propose to include a high granularity beam-beam monitoring detector (BE-BE) to provide a level-0 trigger signal with an expected time resolution of 30 ps. This new detector will improve the determination of the reaction plane by the MPD experiment, a key measurement for flow studies that provides physics insight into the early stages of the reaction. In this work, we use simulated Au+Au collisions at NICA energies to show the potential of such a detector to determine the event plane resolution, providing further redundancy to the detectors originally considered for this purpose namely, the Fast Forward Detector (FFD) and the Hadron Calorimeter (HCAL). We also show our results for the time resolution studies of two prototype cells carried out at the T10 beam line at the CERN PS complex.

   ↳ physics.ins-dethep-exnucl-exnucl-thNucl.Instrum.Meth.A(2020)·8 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.