Wed·May 6, 2020Wednesday·May 6, 2020

1. 01*

   Photonuclear and Two-photon Interactions at High-Energy Nuclear Colliders

   Spencer Klein🇺🇸 · Peter Steinberg🇺🇸

   Ultra-peripheral collisions of heavy ions and protons are the energy frontier for electromagnetic interactions. Both photonuclear and two-photon collisions are studied, at collision energies that are far higher than are available elsewhere. In this review, we will discuss physics topics that can be addressed with UPCs, including nuclear shadowing and nuclear structure and searches for beyond-standard-model physics.

   nucl-exhep-exAnn.Rev.Nucl.Part.Sci.(2020)·160 citations
2. 02*

   Sterile Neutrinos and the Global Reactor Antineutrino Dataset

   Jeffrey M. Berryman🇺🇸 · Patrick Huber🇺🇸

   We present results from global fits to the available reactor antineutrino dataset, as of Fall 2019, to determine the global preference for a fourth, sterile neutrino. We have separately considered experiments that measure the integrated inverse-beta decay (IBD) rate from those that measure the energy spectrum of IBD events at one or more locations. The software used is the newly developed GLoBESfit tool set which is based on the publicly available GLoBES framework and will be released as open-source software.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2021)·63 citations
3. 03*

   Graphic Method for Arbitrary $n$-body Phase Space

   Hao-Jie Jing🇨🇳 · Chao-Wei Shen🇨🇳 · Feng-Kun Guo🇨🇳

   In quantum field theory, the phase space integration is an essential part in all theoretical calculations of cross sections and decay widths. It is also needed for computing the imaginary part of a physical amplitude. A key problem is to get the phase space formula expressed in terms of any chosen invariant masses in an $n$-body system. We propose a graphic method to quickly get the phase space formula of any given invariant masses intuitively for an arbitrary $n$-body system in general $D$-dimensional spacetime, with the involved momenta in any reference frame. The method also greatly simplifies the phase space calculation just as what Feynman diagrams do in calculating scattering amplitudes.

   ↳ hep-phhep-exhep-thnucl-ex+1Sci.Bull.(2021)·11 citations
4. 04*

   Polarized jet fragmentation functions

   Zhong-Bo Kang🇺🇸 · Kyle Lee🇺🇸 · Fanyi Zhao🇺🇸

   We develop the theoretical framework needed to study the distribution of hadrons with general polarization inside jets, with and without transverse momentum measured with respect to the standard jet axis. The key development in this paper, referred to as "polarized jet fragmentation functions", opens up new opportunities to study both collinear and transverse momentum dependent (TMD) fragmentation functions. As two examples of the developed framework, we study longitudinally polarized collinear $\Lambda$ and transversely polarized TMD $\Lambda$ production inside jets in both $pp$ and $ep$ collisions. We find that both observables have high potential in constraining spin-dependent fragmentation functions with sizeable asymmetries predicted, in particular, at the future Electron-Ion Collider.

   ↳ hep-phhep-exnucl-exnucl-thPLB(2020)·67 citations
5. 05*

   Reduction of SO in ${}^{34}$Si: weak binding or density-depletion effect ?

   O. Sorlin🇫🇷 · F. de Oliveira🇫🇷 · J.P. Ebran🇫🇷

   The reduction of the neutron spin-orbit splitting $2p_{3/2}-2p_{1/2}$ between the ${}^{41}$Ca and ${}^{35}$Si isotones is a unique feature throughout the chart of nuclides, as the spin-orbit splitting usually increases with $A$. Moreover, its way of decrease, gradual between ${}^{41}$Ca and ${}^{35}$Si or abrupt between ${}^{37}$S and ${}^{35}$Si, as well as its origin, caused by the weak binding energy of the $p$ states or by the sudden central proton density depletion in ${}^{35}$Si, are subject of debate. The results reported here using the self-consistent Covariant Energy Density Functional calculations with the DD-ME2 parametrization rather point to an abrupt, local decrease in ${}^{35}$Si, and to the large dominance of the central density depletion effect. It is concluded that weak binding, central density depletion as well as correlations must be taken into account to fully evaluate the amplitude and causes of this spin-orbit reduction.

   ↳ nucl-thnucl-exPLB(2020)·7 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.