Mon·Nov 4, 2019Monday·November 4, 2019

1. 01*

   Dynamical grooming of QCD jets

   Yacine Mehtar-Tani🇺🇸 · Alba Soto-Ontoso🇺🇸 · Konrad Tywoniuk🇳🇴

   We propose a new class of infrared-collinear (IRC) and Sudakov safe observables with an associated jet grooming technique that removes dynamically soft and large angle branches. It is based on identifying the hardest branch in the Cambridge/Aachen re-clustering sequence and discarding prior splittings that occur at larger angles. This leads to a dynamically generated cut-off on the phase space of the tagged splitting that is encoded in a Sudakov form factor. In this exploratory study we focus on the mass and momentum sharing distributions of the tagged splitting which we analyze analytically to modified leading logarithmic accuracy and compare to Monte-Carlo simulations.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2020)·66 citations
2. 02*

   Charmed hadron chemistry in relativistic heavy-ion collisions

   Shanshan Cao🇺🇸 · Kai-Jia Sun🇺🇸 · Shu-Qing Li🇨🇳 · Shuai Y.F. Liu🇺🇸 · Wen-Jing Xing🇨🇳 · Guang-You Qin🇨🇳 · Che-Ming Ko🇺🇸

   We develop for charmed hadron production in relativistic heavy-ion collisions a comprehensive coalescence model that includes an extensive set of $s$ and $p$-wave hadronic states as well as the strict energy-momentum conservation, which ensures the boost invariance of the coalescence probability and the thermal limit of the produced hadron spectrum. By combining our hadronization scheme with an advanced Langevin-hydrodynamics model that incorporates both elastic and inelastic energy loss of heavy quarks inside the dynamical quark-gluon plasma, we obtain a successful description of the $p_{\mathrm{T}}$-integrated and differential ${\Lambda }_c/D^0$ and $D_s/D^0$ ratios measured at RHIC and the LHC. We find that including the effect of radial flow of the medium is essential for describing the enhanced ${\Lambda }_c/D^0$ ratio observed in relativistic heavy-ion collisions. We also find that the puzzling larger ${\Lambda }_c/D^0$ ratio observed in Au+Au collisions at RHIC than in Pb+Pb collisions at the LHC is due to the interplay between the effects of the QGP radial flow and the charm quark transverse momentum spectrum at hadronization. Our study further suggests that charmed hadrons have larger sizes in medium than in vacuum.

   ↳ nucl-thhep-phnucl-exPLB(2020)·73 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.