Mon·Oct 17, 2022Monday·October 17, 2022

1. 01*

   Intermittency analysis of charged hadrons generated in Pb-Pb collisions at $\sqrt{s_{NN}}$= 2.76 TeV and 5.02 TeV using PYTHIA8/Angantyr

   Salman Khurshid Malik🇮🇳 · Ramni Gupta🇮🇳

   Local density fluctuations are expected to scale as a universal power-law when the system approaches critical point. Such power-law fluctuations are studied within the framework of intermittency through the measurement of normalized factorial moments in ($\eta$, $\varphi$) phase space. Observations and results from the intermittency analysis performed for charged particles in Pb-Pb collisions using PYTHIA8/Angantyr at 2.76 TeV and 5.02 TeV are reported. We observe no scaling behaviour in the particle generation for any of the centrality studied in narrow p${}_T$ bins. The scaling exponent $\nu$ shows no dependence on the centrality ranges.

   nucl-exhep-exSciPost Phys.Proc.(2024)·2 citations
2. 02*

   Optical potentials for the rare-isotope beam era

   C. Hebborn🇺🇸 · F. M. Nunes🇺🇸 · G. Potel🇺🇸 · W. H. Dickhoff🇺🇸 · J. W. Holt🇺🇸 · M. C. Atkinson🇨🇦 · R. B. Baker🇺🇸 · C. Barbieri🇮🇹 · G. Blanchon🇫🇷 · M. Burrows🇺🇸 · R. Capote🇦🇹 · P. Danielewicz🇺🇸 and 17 other authors

   We review recent progress and motivate the need for further developments in nuclear optical potentials that are widely used in the theoretical analysis of nucleon elastic scattering and reaction cross sections. In regions of the nuclear chart away from stability, which represent a frontier in nuclear science over the coming decade and which will be probed at new rare-isotope beam facilities worldwide, there is a targeted need to quantify and reduce theoretical reaction model uncertainties, especially with respect to nuclear optical potentials. We first describe the primary physics motivations for an improved description of nuclear reactions involving short-lived isotopes, focusing on its benefits for fundamental science discoveries and applications to medicine, energy, and security. We then outline the various methods in use today to build optical potentials starting from phenomenological, microscopic, and ab initio methods, highlighting in particular the strengths and weaknesses of each approach. We then discuss publicly-available tools and resources facilitating the propagation of recent progresses in the field to practitioners. Finally, we provide a set of open challenges and recommendations for the field to advance the fundamental science goals of nuclear reaction studies in the rare-isotope beam era.

   ↳ nucl-thnucl-exJ.Phys.G(2023)·76 citations
3. 03*

   Entanglement of annihilation photons

   Alexander Ivashkin🇷🇺 · Dzhonrid Abdurashitov🇷🇺 · Alexander Baranov🇷🇺 · Fedor Guber🇷🇺 · Sergey Morozov🇷🇺 · Sultan Musin🇷🇺 · Alexander Strizhak🇷🇺 · Igor Tkachev🇷🇺

   We present the results of a new experimental study of the quantum entanglement of photon pairs produced in positron-electron annihilation at rest. The experimental setup includes a system of Compton polarimeters to measure the Compton scattering of annihilation photons in entangled and decoherent states. Decoherent states are prepared by pre-scattering of one of the initial photons prior to measurements in polarimeters. For the first time, a direct comparison of the polarization correlations of annihilation photons in the entangled and thus prepared separable states has been carried out. The angular distributions of scattered photons turned out to be the same in both quantum states, which is an unexpected discovery for the quantum-entangled positron emission tomography. Moreover, the correlation function in the Bell's inequality is also the same for entangled and separable states. It follows that, despite numerous measurements in a series of experiments, there is still no experimental proof of the entanglement of annihilation photons. These results are in line with recent theoretical predictions of an identical Compton scattering cross-section for entangled and specific mixed separable quantum states and cast doubt on the universality of the Bell's theorem for testing the entanglement and nonlocality in quantum theory.

   ↳ quant-phnucl-exSci.Rep.(2023)·24 citations
4. 04*

   Pushing forward jet substructure measurements in heavy-ion collisions

   Daniel Pablos🇮🇹 · Alba Soto-Ontoso🇫🇷

   Energetic jets that traverse the quark-gluon plasma created in heavy-ion collisions serve as excellent probes to study this new state of deconfined QCD matter. Presently, however, our ability to achieve a crisp theoretical interpretation of the crescent number of jet observables measured in experiments is hampered by the presence of selection biases. The aim of this work is to minimise those selection biases associated to the modification of the quark- vs. gluon-initiated jet fraction in order to assess the presence of other medium-induced effects, namely color decoherence, by exploring the rapidity dependence of jet substructure observables. So far, all jet substructure measurements at mid-rapidity have shown that heavy-ion jets are narrower than vacuum jets. We show both analytically and with Monte Carlo simulations that if the narrowing effect persists at forward rapidities, where the quark-initiated jet fraction is greatly increased, this could serve as an unambiguous experimental observation of color decoherence dynamics in heavy-ion collisions.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·30 citations
5. 05*

   Single diffractive hard exclusive processes for the study of generalized parton distributions

   Jian-Wei Qiu🇺🇸 · Zhite Yu🇺🇸

   Generalized parton distributions (GPDs) are important nonperturbative functions that provide tomographic images of partonic structures of hadrons. We introduce a type of exclusive processes, to be referred to as single diffractive hard exclusive processes (SDHEPs). We discuss the necessary and sufficient conditions for SDHEPs to be factorized into GPDs. We demonstrate that the SDHEP is not only sufficiently generic to cover all known processes for extracting GPDs, but is also well motivated for the search of new processes for the study of GPDs. We examine the sensitivity of the SDHEP to the parton momentum fraction $x$ dependence of GPDs.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·82 citations
6. 06*

   ATHENA Detector Proposal -- A Totally Hermetic Electron Nucleus Apparatus proposed for IP6 at the Electron-Ion Collider

   ATHENA Collaboration: J. Adam🇺🇸 · L. Adamczyk🇵🇱 · N. Agrawal🇮🇹 · C. Aidala🇺🇸 · W. Akers🇺🇸 · M. Alekseev🇮🇹 · M.M. Allen🇺🇸 · F. Ameli🇮🇹 · A. Angerami🇺🇸 · P. Antonioli🇮🇹 · N.J. Apadula🇺🇸 · A. Aprahamian🇦🇲 and 427 other authors

   ATHENA has been designed as a general purpose detector capable of delivering the full scientific scope of the Electron-Ion Collider. Careful technology choices provide fine tracking and momentum resolution, high performance electromagnetic and hadronic calorimetry, hadron identification over a wide kinematic range, and near-complete hermeticity. This article describes the detector design and its expected performance in the most relevant physics channels. It includes an evaluation of detector technology choices, the technical challenges to realizing the detector and the R&D required to meet those challenges.

   ↳ physics.ins-dethep-exnucl-exJINST(2022)·51 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.