Nuclear Theory·nucl-th

Wednesday·August 7, 2019

13 papers—10 primary·3 cross-listed

11
The soft drop groomed jet radius at NLL
Zhong-Bo Kang🇺🇸 · Kyle Lee🇺🇸 · Xiaohui Liu🇨🇳 · Duff Neill🇺🇸 · Felix Ringer🇺🇸
We present results for the soft drop groomed jet radius $R_{g}$ at next-to-leading logarithmic accuracy. The radius of a groomed jet which corresponds to the angle between the two branches passing the soft drop criterion is one of the characteristic observables relevant for the precise understanding of groomed jet substructure. We establish a factorization formalism that allows for the resummation of all relevant large logarithms, which is based on demonstrating the all order equivalence to a jet veto in the region between the boundaries of the groomed and ungroomed jet. Non-global logarithms including clustering effects due to the Cambridge/Aachen algorithm are resummed to all orders using a suitable Monte Carlo algorithm. We perform numerical calculations and find a very good agreement with Pythia 8 simulations. We provide theoretical predictions for the LHC and RHIC.
↳ hep-phhep-exnucl-exnucl-thJHEP(2020)·57 citations
12
A cross-channel study of pion scattering from lattice QCD
Maxim Mai🇺🇸 · Chris Culver🇺🇸 · Andrei Alexandru🇺🇸 · Michael Döring🇺🇸 · Frank X. Lee🇺🇸
We use a chiral model for pion interactions, in the inverse amplitude formalism, to perform a simultaneous analysis of lattice QCD results for pion-pion scattering in all three isospin channels. The input is the finite-volume two-pion spectrum computed using lattice QCD from six ensembles on lattices elongated in one of the spatial dimensions. A two-flavor dynamical lattice QCD action is used with two quark masses corresponding to a pion mass of 315 MeV and 224 MeV. The spectrum in the elastic region is subjected to a global fit which takes into account full correlations across isospin, pion mass and decay constant. The parameters from the fit are used to perform a chiral extrapolation to the physical point. The cross-channel fit results in a more precise determination of the parameters of the model when compared with single channel fits. We obtain $m_{π} a_{0}^{I = 0} = 0.2132 (9)$ , and $m_{π} a_{0}^{I = 2} = 0.0433 (2)$ as well as $m_{σ} = 443 (3) - i 221 (6)$ MeV and $m_{ρ} = 724 (4) - i 67 (1)$ MeV. Several aspects of scale setting and consistency with previous analyses of lattice QCD results are discussed as well.
↳ hep-latnucl-thPRD(2019)·61 citations
13
Meson condensation
Massimo Mannarelli🇮🇹
We give a pedagogical review of the properties of the various meson condensation phases triggered by a large isospin or strangeness imbalance. We argue that these phases are extremely interesting and powerful playground for exploring the properties of hadronic matter. The reason is that they are realized in a regime in which various theoretical methods overlap with increasingly precise numerical lattice QCD simulations, providing insight on the properties of color confinement and of chiral symmetry breaking.
↳ hep-phhep-latnucl-thParticles(2019)·90 citations

Affiliations

first authorsco-authorsvia INSPIRE

The soft drop groomed jet radius at NLL

A cross-channel study of pion scattering from lattice QCD

Meson condensation

Affiliations