Thu·Sep 15, 2022Thursday·September 15, 2022

1. 01*

   Connecting low-energy CP violation, resonant leptogenesis and neutrinoless double beta decay in a radiative seesaw model

   Bikash Thapa🇮🇳 · Ng. K. Francis🇮🇳

   We present a study of resonant leptogenesis in a radiative seesaw model. We consider the case where two quasi-degenerate right-handed neutrinos realize resonant leptogenesis, and the CP violation necessary to achieve leptogenesis occurs through the CP phases present in the neutrino mixing matrix. A numerical analysis is performed by taking the best-fit values from the current global data for three neutrino mixing angles and two mass-squared differences. We have shown how the predicted value of baryon asymmetry depends on the Dirac and Majorana CP phases. With the particular choice for the mass parameters, this model prefers a normal hierarchy of neutrino masses based on the value of baryon asymmetry predicted. Using the constrained CP phases, we evaluate the effective neutrino mass, which is relevant to the neutrinoless double beta decay.

   hep-phNPB(2023)·2 citations
2. 02*

   Probing Quantum Gravity with Elastic Interactions of Ultra-High-Energy Neutrinos

   Alfonso Garcia Soto🇺🇸 · Diksha Garg🇺🇸 · Mary Hall Reno🇺🇸 · Carlos A. Argüelles🇺🇸

   The next generation of radio telescopes will be sensitive to low-scale quantum gravity by measuring ultra-high-energy neutrinos. In this letter, we demonstrate for the first time that neutrino-nucleon soft interactions induced by TeV-scale gravity would significantly increase the number of events detected by the IceCube-Gen2 radio array in the EeV regime. However, we show that these experiments cannot measure the total cross section using only the angular and energy information of the neutrino flux, unless assumptions on the underlying inelasticity distribution of neutral interactions are made.

   hep-phhep-exPRD(2023)·12 citations
3. 03*

   Taming the long distance effects in the $D_s^{+}\to {\pi }^{+}{\ell }^{-}{\ell }^{+}$ decay

   Marxil Sánchez🇲🇽 · Genaro Toledo🇲🇽 · I. Heredia De La Cruz🇲🇽

   The semileptonic decay $D_s^{+}\to {\pi }^{+}{\ell }^{-}{\ell }^{+}$, where $\ell =e,\mu$, is used as a reference channel when looking for suppressed or forbidden processes of the standard model of the form $D_s\to P{\ell }^{\pm }{\ell }^{\prime +}$. The process is dominated by hadronic resonances from the $\eta$ to the $\varphi$ meson region, usually excluded due to the large uncertainties associated. In this work, we explore the role of the parameters involved in the resonance region. We focus in the relative strong phase between the $\rho$ and the $\varphi$ meson (${\delta }_{\rho \varphi }$). We argue that this parameter can be bound from LHCb data of the di-muon invariant mass in the $D_s^{+}\to {\pi }^{+}{\mu }^{-}{\mu }^{+}$ decay and we perform a fit to provide a first approach to it. We obtain ${\delta }_{\rho \varphi }=(0.44\pm 0.24)\pi$. In contradistinction, it would be useful to consider observables insensitive to this phase. We first compute the invariant mass of the lepton pair at a given angle of one of the leptons emission with respect to the pion, and then we compute the forward-backward distribution at such angle. We show that for the latter observable the resonance region is smeared, exhibiting no dependence on the ${\delta }_{\rho \varphi }$ phase, although global effects are observed by comparing with the pure phase space approach. In order to consider this observable in more general scenarios, we analyse the behavior for the resonant background process $D_s^{+}\to \pi \pi \pi$, the short distance contribution in the standard model, and the charged Higgs mediated process as given by the two Higgs doublet model, which exhibit distinguishable features among themselves.

   hep-phPRD(2022)·6 citations
4. 04*

   Fluctuations of conserved charges with finite size PNJL model

   Paramita Deb🇮🇳 · Raghava Varma🇮🇳

   Fluctuations of baryon, charge and strangeness have been investigated in Polyakov loop enhanced Nambu--Jona-Lasinio model. Multiple reflection expansion method has been incorporated to include the surface and curvature energy along with the system volume. The results of different fluctuations are then compared with the available experimental data from the heavy ion collision.

   hep-ph1 citation
5. 05*

   Constraints on light decaying dark matter candidates from 16 years of INTEGRAL/SPI observations

   Francesca Calore🇫🇷 · Ariane Dekker🇳🇱 · Pasquale Dario Serpico🇫🇷 · Thomas Siegert🇩🇪

   We apply the recently developed analysis of 16 years of INTEGRAL/SPI data including a dark matter spatial template to derive bounds on dark matter candidates lighter than WIMPs (like sterile neutrinos or axion-like particles) decaying into line or continuum electromagnetic final state channels. The bounds obtained are the strongest to date for dark matter masses between $\sim$60 keV and $\sim$16 MeV experiencing two-body decays producing photon lines.

   hep-phastro-ph.COastro-ph.HEMNRAS(2023)·80 citations
6. 06*

   New constraints on the dark matter-neutrino and dark matter-photon scattering cross sections from TXS 0506+056

   Francesc Ferrer🇺🇸 · Gonzalo Herrera🇩🇪 · Alejandro Ibarra🇩🇪

   The flux of high energy neutrinos and photons produced in a blazar could get attenuated when they propagate through the dark matter spike around the central black hole and the halo of the host galaxy. Using the observation by IceCube of a few high-energy neutrino events from TXS 0506+056, and their coincident gamma ray events, we obtain new constraints on the dark matter-neutrino and dark matter-photon scattering cross sections. Our constraints are orders of magnitude more stringent than those derived from considering the attenuation through the intergalactic medium and the Milky Way dark matter halo. When the cross-section increases with energy, our constraints are also stronger than those derived from the CMB and large-scale structure.

   hep-phastro-ph.HEJCAP(2023)·66 citations
7. 07*

   Light scalars in the Weinberg 3HDM potential with spontaneous CP violation

   R. Plantey🇳🇴 · O. M. Ogreid🇳🇴 · P. Osland🇳🇴 · M. N. Rebelo🇵🇹 · M. Aa. Solberg🇳🇴

   The ${\mathbb{Z}}_2\times {\mathbb{Z}}_2$-symmetric 3HDM potential, sometimes called Weinberg's 3HDM potential, can accommodate both explicit and spontaneous CP violation as well as natural flavour conservation and is hence relevant for studies of CP violation coming from a realistic extended Higgs sector. The model has an interesting regime, controlled by a single parameter, where it acquires an approximate global $U(1)\times U(1)$ symmetry which causes CP violating effects to be small and two pseudo-Goldstone bosons to be present in the scalar spectrum. From parameter space scans, we find that, in a realistic implementation featuring an SM-like Higgs boson, this model predominantely leads to the existence of light additional Higgs bosons with a mass lower than the SM-like Higgs boson.

   hep-phPoS(2022)·2 citations
8. 08*

   Dynamics of bubble walls at the electroweak phase transition

   Stefania De Curtis🇮🇹 · Luigi Delle Rose🇮🇹 · Andrea Guiggiani🇮🇹 · Ángel Gil Muyor🇪🇸 · Giuliano Panico🇮🇹

   First order phase transitions in the early universe naturally lead to the production of a stochastic background of gravitational waves and to the generation of a matter-antimatter asymmetry. The dynamics of the phase transition is affected by the density perturbations in the hot plasma. We address this topic by providing, for the first time, a full numerical solution to the linearized Boltzmann equation for the top quark species coupled to the Higgs field during a first order phase transition at the electroweak scale. Differently from the traditional approaches, our results do not depend on any ansatz and can fully describe the non-equilibrium distribution functions of the particle species in the plasma.

   hep-phEPJ Web Conf.(2022)·9 citations
9. 09*

   New constraints on the up-quark valence distribution in the proton

   Ritu Aggarwal🇮🇳 · Michiel Botje🇳🇱 · Allen Caldwell🇩🇪 · Francesca Capel🇩🇪 · Oliver Schulz🇩🇪

   The high-$x$ data from the ZEUS Collaboration are used to extract parton density distributions of the proton deep in the perturbative regime of QCD. The data primarily constrain the up-quark valence distribution and new results are presented on its $x$-dependence as well as on the momentum carried by the up-quark. The results were obtained using Bayesian analysis methods which can serve as a model for future parton density extractions.

   hep-phhep-exPRL(2023)·11 citations
10. 10*

    Exclusive production of $\rho$ meson in gamma-proton collisions: $d\sigma /dt$ and the role of helicity flip processes

    Anna Cisek🇵🇱 · Wolfgang Schäfer🇵🇱 · Antoni Szczurek🇵🇱

    We calculate the differential cross section $d\sigma /dt$ for the diffractive photoproduction process $\gamma p\to \rho p$ and compare to recent data extracted by the CMS collaboration from ultraperipheral proton-lead collisions. Our model is based on two-gluon exchange in the nonperturbative domain. We take into account both helicity conserving and often neglected helicity-flip amplitudes in the $\gamma \to V$ transition. The letter can contribute at finite $t$. The shape of the differential cross section as well as the role of helicity flip processes is strongly related to the dependence of the unintegrated gluon distribution on transverse momenta in the nonperturbative region.

    hep-phPLB(2023)·18 citations
11. 11*

    The Gildener-Weinberg two-Higgs doublet model at two loops

    Estia J. Eichten🇺🇸 · Kenneth Lane🇺🇸

    The Gildener-Weinberg two-Higgs doublet model (GW-2HDM) provides a naturally light and aligned Higgs boson, $H=H(125)$. It has been studied in the one-loop approximation of its effective potential, $V_1$. An important consequence is that the masses of the model's BSM Higgs bosons ($H^{\prime },A,H^{\pm }$) are bounded by the sum rule ${\left(M_{H^{\prime }}^4+M_A^4+2M_{H^{\pm }}^4\right)}^{1/4}=540\mathrm{GeV}$. Although they are well within reach of the LHC, searches for them have been stymied by large QCD backgrounds. Another consequence is that $H$ is highly aligned, i.e., $H$--$H^{\prime }$ mixing is small and $H$ has only Standard Model couplings. A corollary of this alignment is that search modes such as $H^{\prime },A\leftrightarrow W^{+}{W}^{-},ZZ,HZ$ and $H^{\pm }\leftrightarrow W^{\pm }Z,W^{\pm }H$ are greatly suppressed. To assess the accuracy of the sum rule and Higgs alignment, we study this model in two loops. This calculation is complicated by having many new contributions. We present two formulations of it to calculate the $H$--$H^{\prime }$ mass matrix, its eigenvectors $H_1,H_2$, and the mass $M_{H_2}$ while fixing $M_{H_1}=125\mathrm{GeV}$. They give similar results, in accord with the one-loop results. Requiring $M_A=M_{H^{\pm }}$, we find $180\mathrm{GeV}<M_{A,H^{\pm }}<380$--$425\mathrm{GeV}$ and $550$--$700\mathrm{GeV}>M_{H_2}>125\mathrm{GeV}$, with $M_{H_2}$ decreasing as $M_{A,H^{\pm }}$ increase. The corrections to $H$-alignment are below $\mathcal{O}(1\%)$. So, the BSM searches above will remain fruitless. Finding the BSM Higgses requires improved sensitivity to their low masses. We discuss two possible searches for this.

    hep-phhep-exPRD(2023)·10 citations
12. 12*

    The Decay constants of $B_c(nS)$ and $B_c^{\ast }(nS)$

    Chao Sun🇨🇳 · Ru-Hui Ni🇨🇳 · Muyang Chen🇨🇳

    The decay constants of the low lying S-wave $B_c$ mesons, i.e. $B_c(nS)$ and $B_c^{\ast }(nS)$ with $n\le 3$, are calculated in the nonrelativistic quark model. The running coupling of the strong interaction is taken into account, and the uncertainties due to varying parameters and losing Lorentz covariance are considered carefully. As a byproduct, the decay constants of the low lying S-wave charmonium and bottomium states are given in the appendixes.

    hep-phCPC(2023)·11 citations
13. 13*

    Dark Sector extensions of the Littlest Seesaw in the presence of Primordial Black Holes

    Baradhwaj Coleppa🇮🇳 · Kousik Loho🇮🇳 · Sujay Shil🇧🇷

    The Littlest Seesaw model is a very well motivated dark matter model. Here we consider an extension of that model with an additional scalar and an additional fermionic particle under the freeze-in scenario. Formation of black hole of a certain mass range at primordial times can act as an alternate production mechanism for the dark matter particles as it evaporates via Hawking radiation. Furthermore, the presence of primordial black holes with substantial energy density gives rise to non-standard cosmology which also modifies the freeze-in production. In this paper, we have investigated the extended Littlest Seesaw model under the freeze-in scenario in the presence of a primordial black hole for various interesting cases and constrained the parameter space accordingly. If the universe is primordial black hole dominated at any point in the evolution of the universe, we find that the final relic in that case is dominated mostly by the evaporation component for a high dark matter mass and by the freeze-in component for a low dark matter mass.

    hep-phJCAP(2023)·10 citations
14. 14*

    Di-Higgs production in BSM models

    Tania Robens🇭🇷

    I give a short overview on di-Higgs productions in models that extend the Standard Model of particle physics by additional fields and particle content, including EFT prescriptions.

    hep-phPoS(2023)·1 citation
15. 15*

    Cosmic searches for Lorentz invariance violation

    Carlos Pérez de los Heros🇸🇪 · Tomislav Terzić🇭🇷

    Cosmic messengers (gamma rays, cosmic rays, neutrinos and gravitational waves) provide a powerful complementary way to search for Lorentz invariance violating effects to laboratory-based experiments. The long baselines and high energies involved make Cherenkov telescopes, air-shower arrays, neutrino telescopes and gravitational wave detectors unique tools to probe the expected tiny effects that the breaking of Lorentz invariance would cause in the propagation of these messengers, in comparison with the standard scenario. In this chapter we explain the expected effects that the mentioned detectors can measure and summarize current results of searches for Lorentz violation.

    ↳ astro-ph.HEgr-qchep-phLect.Notes Phys.(2023)·7 citations
16. 16*

    On New Vacua of non-Supersymmetric Strings

    Salvatore Raucci🇮🇹

    We describe two new types of vacua for ten-dimensional string models without supersymmetry, in which dilaton potentials are compensated by constant electric or magnetic fields. These arise from ${\alpha }^{\prime }$ corrections to the equations of motion, and we comment on the reliability of this expansion. We identify explicitly unstable singlet scalar perturbations in the orientifold vacua, and we argue that in both cases additional instabilities are induced by non-abelian couplings.

    ↳ hep-thgr-qchep-phPLB(2023)·28 citations
17. 17*

    The Universe at the MeV era: neutrino evolution and cosmological observables

    Julien Froustey🇫🇷

    Neutrino physics in the early Universe is key to our understanding of later cosmological stages, such as primordial nucleosynthesis (BBN) or the formation of large-scale structures. The coming decade promises new experimental results to explore and constrain cosmological models even more precisely - which requires robust theoretical predictions. This PhD thesis presents a study of the evolution of neutrinos in the first seconds after the Big Bang, more precisely when the temperature of the Universe is of the order of one mega-electronvolt. This evolution is obtained numerically by solving kinetic equations for which we propose a new derivation. A first application is the calculation of the so-called "standard" decoupling in order to calculate the cosmological parameter quantifying the energy density of the primordial relativistic species, $N_{\mathrm{eff}}$, to a precision of a few ten-thousandths. This study has highlighted the possibility of effectively describing the phenomenon of flavour oscillations, taking advantage of the large separation of time scales involved. Such an approximation is then adapted and validated in the case of non-zero asymmetries between neutrinos and antineutrinos. Finally, we study semi-analytically the consequences of incomplete neutrino decoupling on BBN, in order to understand how the primordial abundances of helium and deuterium are affected by this physics.

    ↳ astro-ph.COhep-ph11 citations
18. 18*

    Snowmass Computational Frontier: Topical Group Report on Quantum Computing

    Travis S. Humble🇺🇸 · Gabriel N. Perdue🇺🇸 · Martin J. Savage🇺🇸

    Quantum computing will play a pivotal role in the High Energy Physics (HEP) science program over the early parts of the 21${}^{st}$ Century, both as a major expansion of our capabilities across the Computational Frontier, and in synthesis with quantum sensing and quantum networks. This report outlines how Quantum Information Science (QIS) and HEP are deeply intertwined endeavors that benefit enormously from a strong engagement together. Quantum computers do not represent a detour for HEP, rather they are set to become an integral part of our discovery toolkit. Problems ranging from simulating quantum field theories, to fully leveraging the most sensitive sensor suites for new particle searches, and even data analysis will run into limiting bottlenecks if constrained to our current computing paradigms. Easy access to quantum computers is needed to build a deeper understanding of these opportunities. In turn, HEP brings crucial expertise to the national quantum ecosystem in quantum domain knowledge, superconducting technology, cryogenic and fast microelectronics, and massive-scale project management. The role of quantum technologies across the entire economy is expected to grow rapidly over the next decade, so it is important to establish the role of HEP in the efforts surrounding QIS. Fully delivering on the promise of quantum technologies in the HEP science program requires robust support. It is important to both invest in the co-design opportunities afforded by the broader quantum computing ecosystem and leverage HEP strengths with the goal of designing quantum computers tailored to HEP science.

    ↳ quant-phhep-exhep-phhep-th19 citations
19. 19*

    Analytic Four-Point Lightlike Form Factors and OPE of Null-Wrapped Polygons

    Yuanhong Guo🇨🇳 · Lei Wang🇨🇳 · Gang Yang🇨🇳

    We obtain for the first time the analytic two-loop four-point MHV lightlike form factor of the stress-tensor supermultiplet in planar $\mathcal{N}=4$ SYM where the momentum $q$ carried by the operator is taken to be massless. Remarkably, we find that the two-loop result can be constrained uniquely by the infrared divergences and the collinear limits using the master-bootstrap method. Moreover, the remainder function depends only on three dual conformal invariant variables, which can be understood from a hidden dual conformal symmetry of the form factor arising in the lightlike limit of $q$. The symbol alphabet of the remainder contains only nine letters, which are closed under the action of the dihedral group $D_4$. Based on the dual description in terms of periodic Wilson lines (null-wrapped polygons), we also consider a new OPE picture for the lightlike form factors and introduce a new form factor transition that corresponds to the three-point lightlike form factor. With the form factor results up to two loops, we make some all-loop predictions using the OPE picture.

    ↳ hep-thhep-phCommun.Theor.Phys.(2025)·15 citations
20. 20*

    Matching the mass function of Milky Way satellites in competing dark matter models

    Mark R. Lovell (1)🇮🇸 · Jesús Zavala (1) ((1) University of Iceland)🇮🇸

    Any successful model of dark matter must explain the diversity of observed Milky Way (MW) satellite density profiles, from very dense ultrafaints to large, low density satellites such as Crater~II that appear to be larger their anticipated host dark matter haloes. We consider cold dark matter (CDM), warm dark matter (WDM, 3.3keV thermal relic power spectrum), and a self-interacting dark matter model (SIDM) that induces gravothermal collapse in low mass subhaloes. Predictions for these density profiles are complicated by the limitations of simulation resolution in the stripping of subhaloes by the MW system, therefore we make predictions for satellite properties in these three models using $N$-body simulations combined with a semi-analytic halo stripping algorithm. We find that most CDM and WDM subhaloes of mass $>10^8$$M_{\odot }$ are large enough after stripping to fit most satellites; however, the required amount of stripping often requires a stronger tidal field than is available on the subhalo's orbit. The lower concentrations of WDM subhaloes enable this model to explain the required satellite masses with less stripping than is necessary for CDM, and is thus consistent with orbits of larger pericentres. SIDM cores offer the best fits to massive, low density satellites at the expense of predicting many $>10^9$$M_{\odot }$ subhaloes to host low density satellites with no observed analogue. We conclude that an SIDM model must have a very high velocity-dependent cross-section in order to match all satellites, and that WDM offers a marginally better fit than CDM to the MW satellite mass function.

    ↳ astro-ph.COastro-ph.GAhep-phMNRAS(2023)·16 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.