Fri·Aug 18, 2023Friday·August 18, 2023

1. 01*

   Polarized TMD fragmentation functions for $J/\psi$ production

   Marston Copeland🇺🇸 · Sean Fleming🇺🇸 · Rohit Gupta🇺🇸 · Reed Hodges🇺🇸 · Thomas Mehen🇺🇸

   We calculate the matching, at leading order, of the transverse momentum-dependent fragmentation functions (TMDFFs) for light quarks and gluons fragmenting to a $J/\psi$ onto polarized nonrelativistic QCD (NRQCD) TMDFFs. The NRQCD TMDFFs have an operator-product-expansion in terms of nonperturbative NRQCD production matrix elements. Using the results we obtain, we make predictions for the light quark fragmentation contribution to the production of polarized $J/\psi$ in semi-inclusive deep inelastic scattering (SIDIS) both for unpolarized and longitudinally polarized beams. These results are an important contribution to polarized $J/\psi$ production in SIDIS, and thus are needed for comparison with experiments at the future Electron-Ion Collider.

   hep-phPRD(2024)·28 citations
2. 02*

   Primer on Axion Physics

   Felix Yu🇩🇪

   I review the canonical axion potential, with an emphasis on the field theory underlying radial and angular modes of complex scalar fields. I present the explicit calculation of the instanton-induced breaking of the Goldstone field direction necessary to derive the canonical axion mass and decay constant relation. The primer is intended to serve an audience with elementary quantum field theory expertise.

   hep-phAnnalen Phys.(2024)·8 citations
3. 03*

   Compositeness of near-threshold exotic hadrons with decay and coupled-channel effects

   Tomona Kinugawa🇯🇵 · Tetsuo Hyodo🇯🇵

   The near-threshold exotic hadrons such as $T_{cc}$ and $X(3872)$ are naively considered as the hadronic molecular state from the viewpoint of the low-energy universality. However, it is also known that the elementary dominant state is not completely excluded as the internal structure of the near-threshold states. Furthermore, the dominance of molecules is expected to be modified by the decay or coupled channels. We discuss these features of the near-threshold bound states by calculating the compositeness with the effective field theory.

   hep-phnucl-thEPJ Web Conf.(2024)·0 citations
4. 04*

   Neutrino Mass Sum Rules from Modular ${\mathcal{A}}_4$ Symmetry

   Salvador Centelles Chuliá🇩🇪 · Ranjeet Kumar🇮🇳 · Oleg Popov🇨🇳 · Rahul Srivastava🇮🇳

   Modular symmetries offer a dynamic approach to understanding the flavour structure of leptonic mixing. Using the modular ${\mathcal{A}}_4$ flavour symmetry integrated in a type-II seesaw, we propose a simple and minimalistic model that restricts the neutrino oscillation parameter space and, most importantly, introduces a sum rule in the physical neutrino masses. When combined with the mass squared differences observed in neutrino oscillations, this sum rule determines the absolute neutrino mass scale. This has significant implications for cosmology, neutrinoless double beta decay experiments and direct neutrino mass measurements. In particular, the model predicts ${\sum }_i{m}_i\approx 0.1$ eV for both normal and inverted ordering, and thus can be fully probed by the current generation of cosmological probes in the upcoming years.

   hep-phPRD(2024)·35 citations
5. 05*

   Associated vector meson and bound-free electron-positron pair photoproduction in ultraperipheral $PbPb$ collisions

   Celsina N. Azevedo🇧🇷 · Victor P. Goncalves🇧🇷 · Bruno D. Moreira🇧🇷

   In this letter we analyze the associated production of a vector meson with the bound - free $e^{+}{e}^{-}$ process in ultraperipheral $PbPb$ collisions through the double scattering mechanism for the energy of the Large Hadron Collider (LHC). Such process is characterized by the presence of a meson and a positron in the final state and by a forward hydrogen - like ion with a distinct electric charge. We present our predictions for the total cross sections and rapidity distributions considering the rapidity ranges covered by the ALICE and LHCb detectors, which indicate that a future experimental analysis of the $\varphi +e^{+}$ and $J/\Psi +e^{+}$ final states is feasible.

   hep-phnucl-thPRC(2023)·2 citations
6. 06*

   Probing Stochastic Gravitational Wave Background from $SU(5)\times U(1{)}_{\chi }$ Strings in Light of NANOGrav 15-Year Data

   Waqas Ahmed🇨🇳 · Mansoor Ur Rehman🇵🇰 · Umer Zubair🇺🇸

   A realistic model of $SU(5)\times U(1{)}_{\chi }$, embedded in $SO(10)$ supersymmetric grand unified theory, is investigated for the emergence of a metastable cosmic string network. This network eventually decays via the Schwinger production of monopole-antimonopole pairs, subsequently generating a stochastic gravitational wave background that is compatible with the NANOGrav 15-year data. In order to avoid the monopole problem in the breaking of both $SO(10)$ and $SU(5)$, a non-minimal Higgs inflation scenario is incorporated. The radiative breaking of the $U(1{)}_{\chi }$ symmetry at a slightly lower scale plays a pivotal role in aligning the string tension parameter with the observable range. The resultant gravitational wave spectrum not only accounts for the signal observed in the most recent pulsar timing array (PTA) experiments but is also accessible to both current and future ground-based and space-based experiments.

   hep-phgr-qchep-thJCAP(2024)·38 citations
7. 07*

   Deep Exclusive Meson Production as a probe to the puzzle of $\Lambda$ hyperon polarization

   Zhoudunming Tu🇺🇸

   In the 1970s, an unexpected transverse $\Lambda$ polarization in unpolarized proton-Beryllium collisions was discovered, which initiated extensive studies on spin phenomena in high-energy physics. Over the past five decades, similar transverse $\Lambda$ polarization has been observed across various collision systems, including lepton-hadron deep inelastic scattering, hadron-hadron collisions, and electron-positron collisions. Despite numerous promising theoretical models, the fundamental mechanism underlying this polarization phenomenon remains inconclusive to this day. However, in both longitudinally and transversely polarized lepton-hadron and hadron-hadron collisions, it is found that the $\Lambda$ hyperon is not polarized with respect to the initial parton spin direction. How the $\Lambda$ hyperon acquires its spin has become one of the most crucial questions to address in order to resolve this puzzle. In this paper, I propose to use an exclusive process that can be measured at the Electron-Ion Collider, the Deep Exclusive Meson Production, to explicitly test the mechanism of $\Lambda$ polarization. The outcomes of this experimental measurement are anticipated to unveil the dominant mechanism by which $\Lambda$ obtains its spin, eliminating many of the ambiguities that have been encountered in previous studies. Finally, experimental challenges and requirements will be discussed.

   hep-phhep-exnucl-exnucl-thPRC(2024)·11 citations
8. 08*

   Nuclear Reactor Safeguarding with Neutrino Detection for MOX Loading Verification

   Bryan Helz🇺🇸 · Leia Barrowes🇺🇸 · Igor Jovanovic🇺🇸 · Dean Price🇺🇸 · Brendan Kochunas🇺🇸 · James D. Wells🇺🇸

   The resurgence of interest in nuclear power around the world highlights the importance of effective methods to safeguard against nuclear proliferation. Many powerful safeguarding techniques have been developed and are currently employed, but new approaches are needed to address proliferation challenges from emerging advanced reactor designs and fuel cycles. Building on prior work that demonstrated monitoring of nuclear reactor operation using neutrino detectors, we develop and present a simple quantitative statistical test suitable for analysis of measured reactor neutrino data and demonstrate its efficacy in a semi-cooperative reactor monitoring scenario. In this approach, a moderate-sized neutrino detector is placed near the reactor site to help monitor possible MOX fuel diversion independent of inspection-based monitoring. We take advantage of differing time-dependent neutrino count rates during the operating cycle of a reactor core to monitor any deviations of measurements from expectations given a declared fuel composition. For a five-ton idealized detector placed 25m away from a hypothetical 3565 MWth reactor, the statistical test is capable of detecting the diversion of ~80kg plutonium at the 95% confidence level 90% of the time over a 540-day observation period.

   ↳ physics.soc-phhep-exhep-phphysics.ins-det0 citations
9. 09*

   Finite System Size Correction to the Effective Coupling in ${\varphi }^4$ Scattering

   W. A. Horowitz🇿🇦 · J. F. Du Plessis🇿🇦

   We compute and explore numerically the finite system size correction to NLO $2\to 2$ scattering in massive scalar ${\varphi }^4$ theory. The derivation uses "denominator regularization" (instead of the usual dimensional regularization) on a spacetime with spatial directions compactified to a torus, with characteristic lengths not necessarily of equal size. We determine a useful analytic continuation of the generalized Epstein zeta function to isolate the usual UV divergence. Self-consistently, the renormalized finite system size correction reduces to zero as the system size goes to infinity and, further, satisfies the optical theorem. One of our checks of unitarity leads to a generalization of a number theoretic result from Hardy and Ramanujan. Precise numerical exploration of the finite system size correction to the amplitude and coupling when two spatial dimensions are finite requires the exploitation of the analytic structure of the finite system size result via a dispersion relation. We find that the finite system size scattering amplitude exhibits "geometric" bound states. Even away from these bound states, the finite system size correction to the effective coupling can be large.

   ↳ hep-thhep-phnucl-thPRD(2024)·1 citation
10. 10*

    Axion electrodynamics without Witten effect in metamaterials

    Eduardo Barredo-Alamilla🇷🇺 · Daniel A. Bobylev🇷🇺 · Maxim A. Gorlach🇷🇺

    Artificial media provide unique playground to test fundamental theories allowing one to probe the laws of electromagnetism in the presence of hypothetical axions. While some materials are known to realize this physics, here we propose the nonlocal extension of axion electrodynamics. Compared to the usual axion case, the suggested metamaterial features similar optical properties including Kerr and Faraday rotation. However, the external sources in this structure do not induce dyon charges eliminating well-celebrated Witten effect. We put forward the design of such nonreciprocal non-local metamaterial and discuss its potential applications.

    ↳ physics.opticscond-mat.mes-hallhep-phPRB(2024)·12 citations
11. 11*

    Excluded Volume Effects on Cold Neutron Star Phenomenology

    Jesper Leong🇦🇺 · Anthony W. Thomas🇦🇺 · Pierre A. M. Guichon🇫🇷

    Observable properties of neutron stars are studied within a hadronic equation of state derived from the quark level. The effect of short-range repulsion is incorporated within the excluded volume framework. It is found that one can sustain neutron stars with masses as large as 2.2$M_{\odot }$ even including hyperons in $\beta$ equilibrium, while producing radii and tidal deformabilities consistent with current constraints.

    ↳ nucl-thastro-ph.HEhep-phNPA(2024)·9 citations
12. 12*

    Structure Formation after Reheating: Supermassive Primordial Black Holes and Fermi Ball Dark Matter

    Marcos M. Flores🇺🇸 · Yifan Lu🇺🇸 · Alexander Kusenko🇺🇸

    In the presence of (relatively) long-range forces, structures can form even during the radiation dominated era, leading to compact objects, such as Fermi balls or primordial black holes (PBHs), which can account for all or part of dark matter. We present a detailed analysis of a model in which fermions are produced from the inflaton decay developing some particle-antiparticle asymmetry. These fermions undergo clustering and structure formation driven by a Yukawa interaction. The same interaction provides a cooling channel for the dark halos via scalar radiation, leading to rapid collapse and the formation of a compact object. We discuss the criteria for the formation of either PBHs and Fermi balls. In the PBH formation regime, supermassive PBHs can seed the active galactic nuclei or quasars found at high redshift. Alternatively, Fermi balls can account for all of the cold dark matter, while evading microlensing constraints.

    ↳ astro-ph.COhep-phPRD(2023)·29 citations
13. 13*

    Collective neutrino oscillations on a quantum computer with hybrid quantum-classical algorithm

    Pooja Siwach🇺🇸 · Kaytlin Harrison🇺🇸 · A. Baha Balantekin🇺🇸

    We simulate the time evolution of collective neutrino oscillations in two-flavor settings on a quantum computer. We explore the generalization of Trotter-Suzuki approximation to time-dependent Hamiltonian dynamics. The trotterization steps are further optimized using the Cartan decomposition of two-qubit unitary gates U $\in$ SU (4) in the minimum number of controlled-NOT (CNOT) gates making the algorithm more resilient to the hardware noise. A more efficient hybrid quantum-classical algorithm is also explored to solve the problem on noisy intermediate-scale quantum (NISQ) devices.

    ↳ quant-phhep-phhep-thPRD(2023)·26 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.