Mon·Aug 1, 2022Monday·August 1, 2022

1. 01*

   An Investigation of Charm Quark Jet Spectrum and Shape Modifications in Au+Au Collisions at $\sqrt{s_{\text{NN}}}=200\text{ GeV}$

   Diptanil Roy (For the STAR Collaboration)🇺🇸

   Partons in heavy-ion collisions interact strongly with the Quark-Gluon Plasma (QGP), and hence have their energy and shower structure modified compared to those in vacuum. Theoretical calculations predict that the radiative energy loss, which is the dominant mode of energy loss for gluons and light quarks in the QGP, is suppressed for heavy quarks at low transverse momenta ($p_{\text{T}}$). At RHIC energies, lower energy jets closer to the charm quark mass are more accessible, and could provide key insight into the understanding of the mass dependence of parton energy loss. We report the first measurements of the $D^0(c\bar{u})$ meson tagged jet $p_{\text{T}}$ spectra and the $D^0$ meson radial profile in jets reconstructed from Au+Au collisions at $\sqrt{s_{\text{NN}}}=200\text{ GeV}$, collected by the STAR experiment.

   nucl-exhep-exActa Phys.Polon.Supp.(2023)·3 citations
2. 02*

   Improved background subtraction and a fresh look at jet sub-structure in JEWEL

   José Guilherme Milhano🇵🇹 · Korinna Zapp🇸🇪

   Interactions of hard partons in the Quark Gluon Plasma (QGP) created with relativistic heavy ion collisions lead to characteristic modifications of the internal structure of reconstructed jets. A large part of the observed jet sub-structure modifications stem from the QGP's response to energy and momentum deposited by hard partons. Good control over medium response in theoretical calculations is thus instrumental to a quantitative understanding of medium modified (quenched) jets in heavy ion collisions. We present an improved way of handling the medium response in the jet quenching model JEWEL and present results for a variety of jet sub-structure observables. The new recoil handling is more versatile and robust than the old scheme, giving a better control over many observables and, in particular, greatly improves the description of the jet mass.

   ↳ hep-phnucl-exnucl-thEPJC(2022)·33 citations
3. 03*

   On Baryon and Lepton Number Violation

   Pavel Fileviez Perez🇺🇸 · Andrea Pocar🇺🇸 · K. S. Babu🇺🇸 · Leah J. Broussard🇺🇸 · Vincenzo Cirigliano🇺🇸 · Susan Gardner🇺🇸 · Julian Heeck🇺🇸 · Ed Kearns🇺🇸 · Andrew J. Long🇺🇸 · Stuart Raby🇺🇸 · Richard Ruiz🇵🇱 · Evelyn Thomson🇺🇸 · Carlos E. M. Wagner🇺🇸 · Mark B. Wise🇺🇸

   In this report we discuss the main theories to understand the origin of baryon and lepton number violation in physics beyond the Standard Model. We present the theoretical predictions for rare processes such as neutrinoless double beta decay, proton decay, and neutron-antineutron oscillation, and overview the prospects to discover these rare processes in the near future. The possibility to observe baryon and lepton violating signatures at current and future colliders and through precision studies of other rare processes, and the testability of different baryogenesis mechanisms is discussed in detail. A healthy and broad experimental program looking for proton decay, neutrinoless double beta decay and neutron-antineutron oscillations is essential to make new discoveries in this field. These searches are carried out at various experimental facilities in the US and abroad, and use instrumentation arching across traditional HEP/NP boundaries. In addition, experiments such as those at the Large Hadron Collider could discover exotic baryon and/or lepton number violating signatures connected to low energy scale theories for neutrino masses, supersymmetric models with R-parity violation, new gauge theories or other mechanisms for physics beyond the Standard Model. The landscape presented in this report could be crucial to discover the underlying mechanism for neutrino masses and the matter-antimatter asymmetry in the universe.

   ↳ hep-phhep-exhep-thnucl-ex34 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.