Mon·May 9, 2022Monday·May 9, 2022

1. 01*

   Production of ${\rm Y}(\text{nS})$ mesons in Pb+Pb and $pp$ collisions at 5.02 TeV

   ATLAS Collaboration

   A measurement of the production of vector bottomonium states, ${\rm Y}(\text{1S})$, ${\rm Y}(\text{2S})$, and ${\rm Y}(\text{3S})$, in Pb+Pb and $pp$ collisions at a center-of-mass energy per nucleon pair of 5.02 TeV is presented. The data correspond to integrated luminosities of 1.38~${\text{nb}}^{-1}$ of Pb+Pb data collected in 2018, 0.44 ${\text{nb}}^{-1}$ of Pb+Pb data collected in 2015, and 0.26 ${\text{fb}}^{-1}$ of $pp$ data collected in 2017 by the ATLAS detector at the Large Hadron Collider. The measurements are performed in the dimuon decay channel for transverse momentum $p_{\text{T}}^{\mu \mu }<30$~ GeV, absolute rapidity $|y^{\mu \mu }|<1.5$, and Pb+Pb event centrality 0-80%. The production rates of the three bottomonium states in Pb+Pb collisions are compared with those in $pp$ collisions to extract the nuclear modification factors as functions of event centrality, $p_{\text{T}}^{\mu \mu }$, and $|y^{\mu \mu }|$. In addition, the suppression of the excited states relative to the ground state is studied. The results are compared with theoretical model calculations.

   nucl-exPRC(2023)·48 citations
2. 02*

   New direct limit on neutrinoless double beta decay half-life of ${}^{128}$Te with CUORE

   (CUORE Collaboration) D. Q. Adams🇺🇸 · C. Alduino🇺🇸 · K. Alfonso🇺🇸 · F. T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · G. Bari🇮🇹 · F. Bellini🇮🇹 · G. Benato🇮🇹 · M. Beretta🇺🇸 · M. Biassoni🇮🇹 · A. Branca🇮🇹 · C. Brofferio🇮🇹 and 108 other authors

   The Cryogenic Underground Observatory for Rare Events (CUORE) at Laboratori Nazionali del Gran Sasso of INFN in Italy is an experiment searching for neutrinoless double beta (0$\nu \beta \beta$) decay. Its main goal is to investigate this decay in ${}^{130}$Te, but its ton-scale mass and low background make CUORE sensitive to other rare processes as well. In this work, we present our first results on the search for \nbb decay of ${}^{128}$Te, the Te isotope with the second highest natural isotopic abundance. We find no evidence for this decay, and using a Bayesian analysis we set a lower limit on the ${}^{128}$Te \nbb decay half-life of T${}_{1/2}>3.6\times 10^{24}$ yr (90\% CI). This represents the most stringent limit on the half-life of this isotope, improving by over a factor 30 the previous direct search results, and exceeding those from geochemical experiments for the first time.

   nucl-exPRL(2022)·40 citations
3. 03*

   J-PARC hadron physics and future possibilities on color transparency

   S. Kumano🇯🇵

   The J-PARC is a hadron-accelerator facility to provide secondary beams of kaons, pions, neutrinos, muons, and the others together with the primary proton beam for investigating a wide range of science projects. High-energy hadron physics can be studied by using high-momentum beams of unseparated hadrons, which are essentially pions, and also primary protons. In this report, possible experiments are explained on color transparency and generalized parton distributions (GPDs). These projects are complementary to lepton-scattering experiments at JLab, COMPASS/AMBER, and future electron-ion colliders. Because of hadron-beam energies up to 30 GeV, the J-PARC is a unique facility to investigate the transition region from the hadron degrees of freedom to the quark-gluon one. It is suitable for finding mechanisms of the color transparency. Such color-transparency studies are also valuable for clarifying factorization of hadron-production processes in extracting the GPDs from actual measurements. These studies will lead to the understanding of basic high-energy hadron interactions in nuclear medium and to clarifications on the origins of hadron spins, masses, and internal pressure mechanisms.

   ↳ hep-phhep-exhep-latnucl-ex+1MDPI Physics(2022)·9 citations
4. 04*

   Conductivity, diffusivity, and violation of Wiedemann-Franz Law in a hadron resonance gas with van der Waals interactions

   Kshitish Kumar Pradhan🇮🇳 · Dushmanta Sahu🇮🇳 · Ronald Scaria🇮🇳 · Raghunath Sahoo🇮🇳

   In this work, a hadron resonance gas under van der Waals (VDW) interactions has been studied. Both attractive and repulsive interactions between the meson-meson and (anti)baryon-(anti)baryon have been taken into consideration. Various transport properties such as electrical conductivity (${\sigma }_{\mathrm{el}}$) and thermal conductivity (${\kappa }_{\mathrm{th}}$) have been estimated by solving the Boltzmann transport equation under the relaxation time approximation. The effect of baryochemical potential (${\mu }_{\mathrm{B}}$) and temperature is also explicitly explored for the mentioned observables. Comparisons have been made with the results obtained from other existing theoretical models. We observe the violation of Wiedemann-Franz law in a hadron resonance gas at a high-temperature regime. The corresponding diffusivities have also been estimated, which can help us to understand the system in a better way.

   ↳ hep-phhep-exnucl-exnucl-thPRC(2023)·32 citations
5. 05*

   Heavy-ion and fixed-target physics at LHCb

   Saverio Mariani (on behalf of the LHCb collaboration)🇮🇹

   In parallel to the study of proton-proton collisions, LHCb is developing a unique heavy-ion programme and is pioneering beam-gas fixed-target physics at the CERN LHC. In this document, a selection of some recent results from both programmes is presented.

   ↳ hep-exnucl-ex1 citation
6. 06*

   Conformal Colliders Meet the LHC

   Kyle Lee🇺🇸 · Bianka Meçaj🇺🇸 · Ian Moult🇺🇸

   The remarkably high energies of the Large Hadron Collider (LHC) have allowed for the first measurements of the shapes and scalings of multi-point correlators of energy flow operators, $⟨\Psi |\mathcal{E}({\vec{n}}_1)\mathcal{E}({\vec{n}}_2)\cdots \mathcal{E}({\vec{n}}_k)|\Psi ⟩$, providing new insights into the Lorentzian dynamics of quantum chromodynamics (QCD). In this Letter, we use recent advances in effective field theory to derive a rigorous factorization theorem for the light-ray density matrix, $\rho =|\Psi ⟩⟨\Psi |$, inside high transverse momentum jets at the LHC. Using the light-ray operator product expansion, the scaling behavior of multi-point correlators can be computed from the expectation value of the twist-2 spin-$J$ light-ray operators, ${\mathbb{O}}^{[J]}$, in this state, $\text{Tr}[\rho {\mathbb{O}}^{[J]}]$. We compute the light-ray density matrix at next-to-leading order, and combine this with results for the next-to-leading logarithmic scaling behavior of the correlators up to six-points, comparing with CMS Open Data. This theoretical accuracy allows us to resolve the quantum scaling dimensions of QCD light-ray operators inside jets at the LHC. Our factorization theorem for the light-ray density matrix at the LHC completes the link between recent developments in the study of energy correlators and LHC phenomenology, opening the door to a wide variety of precision jet substructure studies.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2025)·133 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.