Nuclear Theory·nucl-th

Wednesday·January 16, 2019

17 papers—11 primary·6 cross-listed

12
The Transverse Energy-Energy Correlator in the Back-to-Back Limit
AnJie Gao🇨🇳 · Hai Tao Li🇺🇸 · Ian Moult🇺🇸 · Hua Xing Zhu🇨🇳
We present an operator based factorization formula for the transverse energy-energy correlator (TEEC) hadron collider event shape in the back-to-back (dijet) limit. This factorization formula exhibits a remarkably symmetric form, being a projection onto a scattering plane of a more standard transverse momentum dependent factorization. Soft radiation is incorporated through a dijet soft function, which can be elegantly obtained to next-to-next-to-leading order (NNLO) due to the symmetries of the problem. We present numerical results for the TEEC resummed to next-to-next-to-leading logarithm (NNLL) matched to fixed order at the LHC. Our results constitute the first NNLL resummation for a dijet event shape observable at a hadron collider, and the first analytic result for a hadron collider dijet soft function at NNLO. We anticipate that the theoretical simplicity of the TEEC observable will make it indispensable for precision studies of QCD at the LHC, and as a playground for theoretical studies of factorization and its violation.
↳ hep-phnucl-thPRL(2019)·93 citations
13
Thermal width of the Higgs boson in hot QCD matter
Jacopo Ghiglieri🇨🇭 · Urs Achim Wiedemann🇨🇭
Following Caron-Huot and combining results for the thermal dependence of spectral functions at large time-like momenta, we write an explicit expression for the thermal width of the Higgs boson to $O (α_{s})$ for $T ≪ M_{H}$ . It is an $O (α_{s} (T / M_{H})^{4})$ correction for $H \to g g$ and $H \to q q ˉ$ . We also compile corresponding results for the thermal width of the $Z$ -boson, and we recall which generic structures of the field theory, accessible via the operator product expansion, fix the $T / M$ -dependence of the decay of heavy particles.
↳ hep-phnucl-thPRD(2019)·12 citations
14
Total Hadronic Cross Sections via the Holographic Pomeron Exchange
Akira Watanabe🇨🇳
The analysis on the hadron-hadron scattering at high energies in the framework of holographic QCD is presented. Combining the Pomeron exchange kernel and the hadron-Pomeron couplings which are obtained from the bottom-up AdS/QCD models, we calculate the total cross sections. Our calculation for the nucleon-nucleon scattering is consistent with the experimental data including the recent ones measured by the TOTEM collaboration at the LHC. Within the framework, one can consider other processes involving other hadrons. As examples to show this feature of the model, the resulting total cross sections of the pion-nucleon and pion-pion scattering are also presented.
↳ hep-phnucl-thJPS Conf.Proc.(2019)·0 citations
15
Sensitivity to sterile neutrino mixing using reactor antineutrinos
S. P. Behera🇮🇳 · D. K. Mishra🇮🇳 · L. M. Pant🇮🇳
The reactor antineutrinos are used for the precise measurement of oscillation parameters in the 3-neutrino model, and also used to investigate active-sterile neutrino mixing sensitivity in the 3 $+$ 1 neutrino framework. In the present work, we study the feasibility of sterile neutrino search with the Indian Scintillator Matrix for Reactor Anti-Neutrino (ISMRAN) experimental set-up using electron antineutrinos ( $ν_{e}$ ) produced from reactor as a source. The so-called 3 $+$ 1 scenario is considered for active-sterile neutrino mixing, which leads to projected exclusion curves in the sterile neutrino mass and mixing angle plane. The analysis is performed considering both the reactor and detector related parameters. It is found that, the ISMRAN set-up can observe the active-sterile neutrino mixing sensitivity for $sin^{2} 2 θ_{14} \geq$ 0.064 and $Δ m_{41}^{2}$ = 1.0 eV $^{2}$ at 90 $%$ confidence level for an exposure of 1 ton-year by using neutrinos produced from the DHRUVA reactor with thermal power of 100 MW $_{t h}$ . It is also observed that, there is a significant improvement of the active-sterile neutrino mixing parameter $sin^{2} 2 θ_{14}$ to $\sim$ 0.03 at the same $Δ m_{41}^{2}$ by putting the ISMRAN detector set-up at a distance of 20 m from the compact proto-type fast breeder reactor (PFBR) facility with thermal power of 1250 MW $_{t h}$ .
↳ hep-phnucl-exnucl-thEPJC(2019)·8 citations
16
In-medium properties of the low-lying bottom baryons in the quark-meson coupling model
K. Tsushima🇧🇷
In-medium properties of the low-lying baryons are studied in the quark-meson coupling (QMC) model, focusing on the $Σ_{b}$ and $Ξ_{b}$ baryons. It is predicted that the Lorentz-scalar effective mass of $Σ_{b}$ becomes smaller than that of $Ξ_{b}$ at moderate nuclear matter density, and as the density increases, namely, $m_{Σ_{b}}^{*} < m_{Ξ_{b}}^{*}$ , although in vacuum $m_{Σ_{b}} > m_{Ξ_{b}}$ . We also study the effects of the repulsive Lorentz-vector potentials on the excitation energies of these bottom baryons.
↳ hep-phnucl-thJPS Conf.Proc.(2019)·0 citations
17
Near-the-origin divergence of Dirac wave functions of hydrogen and operator product expansion
Yingsheng Huang🇨🇳 · Yu Jia🇨🇳 · Rui Yu🇨🇳
There is a long-standing puzzle concerning the Coulomb solutions of the Dirac equation, i.e., what is the physics governing the weakly divergent near-the-origin behavior of the Dirac wave functions of the $n S_{1/2}$ hydrogen? As a sequel of our preceding work that aim to demystifying the universal near-the-origin behavior of the atomic Schrödinger and Klein-Gordon wave functions, the goal of this work is to demonstrate that, within the nonrelativistic effective field theory (NREFT) tailored for Coulombic atoms, the universal logarithmic divergence of the Dirac wave functions can be accounted by the perturbatively calculable Wilson coefficient emerging from the operator product expansion (OPE) of the electron and the nucleus fields. The cause is due to the relativistic kinetic correction and Darwin (zitterbewegung) term in the NREFT. With the aid of renormalization group equation, one can resum the leading logarithms to all orders in $Z α$ and recover the $r^{- Z^{2} α^{2} /2}$ anomalous scaling behavior exhibited by the Dirac wave function for the $n S_{1/2}$ hydrogen. It appears somewhat counterintuitive that these universal logarithmic divergences can not be accounted by the OPE set up in the relativistic QED. We are thereby enforced to conclude that the Dirac wave function must cease to be meaningful when $r$ is shorter than the electron's Compton wavelength.
↳ hep-phhep-thnucl-thphysics.atom-ph1 citation

Affiliations

first authorsco-authorsvia INSPIRE

The Transverse Energy-Energy Correlator in the Back-to-Back Limit

Thermal width of the Higgs boson in hot QCD matter

Total Hadronic Cross Sections via the Holographic Pomeron Exchange

Sensitivity to sterile neutrino mixing using reactor antineutrinos

In-medium properties of the low-lying bottom baryons in the quark-meson coupling model

Near-the-origin divergence of Dirac wave functions of hydrogen and operator product expansion

Affiliations