Mon·Jan 2, 2023Monday·January 2, 2023

1. 01*

   Structure-Dependent QED Effects in Exclusive B Decays at Subleading Power

   Claudia Cornella🇩🇪 · Matthias König🇩🇪 · Matthias Neubert🇩🇪

   We derive a factorization theorem for the structure-dependent QED effects in the weak exclusive process $B^{-}\to {\ell }^{-}{\bar{\nu }}_{\ell }$, i.e., effects probing the internal structure of the $B$ meson. The derivation requires a careful treatment of endpoint-divergent convolutions common to subleading-power factorization formulas. We find that the decay amplitude is sensitive to two- and three-particle light-cone distribution amplitudes of the $B$ meson as well as to a new hadronic parameter $F(\mu ,\Lambda )$, which generalizes the notion of the $B$-meson decay constant in the presence of QED effects. This is the first derivation of a subleading-power factorization theorem in which the soft functions are non-perturbative hadronic matrix elements.

   hep-phPRD(2023)·34 citations
2. 02*

   Muon $g-2$ and $W$-mass in a framework of colored scalars: an LHC perspective

   Nabarun Chakrabarty🇮🇳 · Indrani Chakraborty🇮🇳 · Dilip Kumar Ghosh🇮🇳 · Gourab Saha🇮🇳

   A color octet isodoublet can have esoteric origins and it complies with minimal flavour violation. In this study, we take a scenario where the well known Type-X Two-Higgs doublet model is augmented with a color octet isodoublet. We shed light on how such a setup can predict the recently observed value for the $W$-boson mass. We also evaluate the two-loop Barr-Zee contributions to muon $g-2$ stemming from the colored scalars. The parameter space compatible with the observed muon $g-2$ gets relaxed w.r.t. what it is in the pure Type-X 2HDM by virtue of the contribution from the colored scalars. The extended parameter region therefore successfully accounts for both the $W$-mass and muon $g-2$ anomalies successfully. Finally, a collider signature leading to ${\tau }^{+}{\tau }^{-}b\bar{b}$ final state is explored at the 14 TeV LHC using both cut-based and multivariate techniques. Such a signal can confirm the existence of both colorless as well colored scalars that are introduced by this framework.

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

   Explaining the $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ Anomalies in the $B-L$ Supersymmetric Standard Model with Inverse Seesaw

   Dris Boubaa🇩🇿 · Shaaban Khalil🇪🇬 · Stefano Moretti🇬🇧 · Cem Salih Un🇪🇸

   We investigate the $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ anomalies in the context of the $B-L$ extension of the Minimal Supersymmetric Standard Model with Inverse Seesaw. We demonstrate that the lepton penguin $W^{\pm }l{\bar{\nu }}_l$ ($l=e,\mu ,\tau$) mediated by CP-even/odd right-handed sneutrinos, charginos and neutralinos can account for these anomalies simultaneously.

   hep-phPRD(2023)·7 citations
4. 04*

   Neutrinophilic DM annihilation in a model with $U(1{)}_{L_{\mu }-L_{\tau }}\times U(1{)}_H$ gauge symmetry

   Keiko I. Nagao🇯🇵 · Takaaki Nomura🇨🇳 · Hiroshi Okada🇰🇷 · Takashi Shimomura🇯🇵

   We propose a model with two different extra $U(1)$ gauge symmetries; muon minus tauon symmetry $U(1{)}_{L_{\mu }-L_{\tau }}$ and hidden symmetry $U(1{)}_H$. Then, we explain muon anomalous magnetic moment, semi-leptonic decays $b\to s\ell \bar{\ell }$, and dark matter. In particular, we find an intriguing dark matter candidate to be verified by Hyper-Kamiokande and JUNO in the future that request neutrinophilic DM with rather light dark matter mass$\sim \mathcal{O}(10)$ MeV.

   hep-phhep-exPRD(2023)·9 citations
5. 05*

   $W$-Boson Mass Anomaly from a General $SU(2{)}_L$ Scalar Multiplet

   Jiajun Wu🇨🇳 · Da Huang🇨🇳 · Chao-Qiang Geng🇨🇳

   We explain the $W$-boson mass anomaly by introducing an $SU(2{)}_L$ scalar multiplet with general isospin and hypercharge in the case without its vacuum expectation value. It is shown that the dominant contribution from the scalar multiplet to the $W$-boson mass arises at one-loop level, which can be expressed in terms of the electroweak (EW) oblique parameters $T$ and $S$ at leading order. We firstly rederive the general formulae of $T$ and $S$ induced by a scalar multiplet of EW charges, confirming the results in the literature. We then study several specific examples of great phenomenological interest by applying these general expressions. As a result, it is found that the model with a scalar multiplet in an $SU(2{)}_L$ real representation with $Y=0$ cannot generate the required $M_W$ correction since it leads to vanishing values of $T$ and $S$. On the other hand, the cases with scalars in a complex representation under $SU(2{)}_L$ with a general hypercharge can explain the $M_W$ excess observed by CDF-\uppercase\expandafter{\romannumeral2} due to nonzero $T$ and $S$. We further take into account of the strong constraints from the perturbativity and the EW global fit of the precision data, and vary the isospin representation and hypercharge of the additional scalar multiplet, in order to assess the extent of the model to solve the $W$-boson mass anomaly. It turns out that these constraints play important roles in setting limits on the model parameter space. We also briefly describe the collider signatures of the extra scalar multiplet, especially when it contains long-lived heavy highly charged states.

   hep-phCPC(2023)·9 citations
6. 06*

   Spin-1 quarkonia in a rotating frame and their spin contents

   HyungJoo Kim🇰🇷 · Sungtae Cho🇰🇷 · Su Houng Lee🇰🇷

   We propose a new way of studying the spin content of a hadron by looking at its response in a rotating frame. By collecting all responses of quarks and gluons in a rotating frame, we describe the spin-rotation coupling of spin-1 quarkonia and thereby reveal their spin contents in a relativistic formalism. We demonstrate that both the perturbative and non-perturbative contributions in the operator product expansion follow a universal formula that identifies the spin-rotation coupling with unit strength. This allows us to recognize the total spin-1 of the vector and axial vector quarkonia in terms of the total angular momentum of quarks and gluons. Specifically, we find the spin contents of $J/\psi$, ${\chi }_{c1}$, ${\rm Y}(1S)$, and ${\chi }_{b1}$ are slightly different from the naive quark model picture. For example, the $J/\psi$ is traditionally considered as an S-wave particle, but we find quarks do not carry all of the total spin.

   hep-phhep-exnucl-exnucl-thPLB(2023)·6 citations
7. 07*

   Small-x behavior of quark pseudo- and quasi-PDFs

   Giovanni Antonio Chirilli🇩🇪

   The pseudo- and the quasi-PDFs defined through space-like separated bilocal operators allow direct access to the parton distribution functions (PDFs) from first principles within lattice gauge theory. This formalism, however, leaves the small Bjorken $x$ regime inaccessible. In view of the future Electron-Ion Collider, the study of the PDFs at small-$x$ is timely. For this reason, we calculate the quark pseudo- and quasi-PDF in the high-energy limit and show that they have rather different behavior. In particular, we show that the quark pseudo-PDF has the expected small-$x$ rising behavior while the quasi-PDF becomes ill-defined at this regime. Moreover, we also obtain the leading and next-to-leading twist corrections for each of the two distributions. For the pseudo-PDF, although the first two twist corrections follow the same small-$x$ behavior as the one with BFKL resummation, unexpectedly, the next-to-leading correction appears to be only a small shift with respect to the leading one. Unlike the pseudo-PDF, the quasi-PDF exhibits rather unusual behavior at small-$x$.

   hep-ph3 citations
8. 08*

   Higgs Portal Majorana Fermionic Dark Matter with the Freeze-in Mechanism

   Junpei Ikemoto🇯🇵 · Naoyuki Haba🇯🇵 · Shimizu Yasuhiro🇯🇵 · Toshifumi Yamada🇯🇵

   We consider a minimal model of fermionic dark matter, in which the Majorana fermion dark matter (DM) $\chi$ couples with the Standard Model (SM) Higgs field $H$ through a higher-dimensional term $-\mathcal{L}\supset H^{†}H\bar{\chi }\chi /\Lambda$, where $\Lambda$ is the cutoff scale. We assume that $\Lambda$ is sufficiently large that DM particles are not in thermal equilibrium with the SM Particles throughout the history of the Universe. Hence, DM particles are produced only by the freeze-in mechanism. Through a numerical analysis of the freeze-in mechanism, we show contour plots of the DM relic abundance for various values of the DM mass, reheating temperature and the cutoff scale. We obtain an upper bound of the DM mass and cutoff scale from contour plots on ($m_{\chi },\Lambda$)-plane. We also consider the direct DM detection for the parameter regions where the DM relic abundance is consistent with the experimental values. We find that the spin-independent cross section for the elastic scattering with a nucleon is below the current experimental upper bound.

   hep-phhep-thPTEP(2023)·7 citations
9. 09*

   Phase diagram of holographic thermal dense QCD matter with rotation

   Yan-Qing Zhao🇨🇳 · Song He🇨🇳 · Defu Hou🇨🇳 · Li Li🇨🇳 · Zhibin Li🇨🇳

   We study the rotation effects of the hot and dense QCD matter in a non-perturbative regime by the gauge/gravity duality. We use the gravitational model that is designated to match the state-of-the-art lattice data on the thermal properties of (2+1)-flavor QCD and predict the location of the critical endpoint and the first-order phase transition line at large baryon chemical potential without rotation. After introducing the angular velocity via a local Lorentz boost, we investigate the thermodynamic quantities for the system under rotation in a self-consistent way. We find that the critical temperature and baryon chemical potential associated with the QCD phase transition decrease as the angular velocity increases. Moreover, some interesting phenomena are observed near the critical endpoint. We then construct the 3-dimensional phase diagram of the QCD matter in terms of temperature, baryon chemical potential, and angular velocity. As a parallel investigation, we also consider the gravitational model of $SU(3)$ pure gluon system, for which the 2-dimensional phase diagram associated with temperature and angular velocity has been predicted. The corresponding thermodynamic quantities with rotation are investigated.

   hep-phhep-thJHEP(2023)·82 citations
10. 10*

    Probing the Nature of Heavy Neutral Leptons in Direct Searches and Neutrinoless Double Beta Decay

    Patrick D. Bolton🇮🇹 · Frank F. Deppisch🇬🇧 · Mudit Rai🇺🇸 · Zhong Zhang🇬🇧

    Heavy Neutral Leptons (HNLs) are a popular extension of the Standard Model to explain the lightness of neutrino masses and the matter-antimatter asymmetry through leptogenesis. Future direct searches, such as fixed target setups like DUNE, and neutrinoless double beta decay are both expected to probe the regime of active-sterile neutrino mixing in a standard Seesaw scenario of neutrino mass generation for HNL masses around m_N <~ 1 GeV. Motivated by this, we analyse the complementarity between future direct searches and neutrinoless double beta decay to probe the nature of HNLs, i.e., whether they are Majorana or quasi-Dirac states, and CP-violating phases in the sterile neutrino sector. Following an analytic discussion of the complementarity, we implement a generic fixed target experiment modelling DUNE. We perform a statistical study in how a combined search for HNLs in direct searches and neutrinoless double beta decay, using DUNE and LEGEND-1000 as representative examples, can probe the nature of sterile neutrinos.

    hep-phNPB(2025)·19 citations
11. 11*

    Electroweak baryogenesis in the three-loop neutrino mass model with dark matter

    Mayumi Aoki🇯🇵 · Kazuki Enomoto🇰🇷 · Shinya Kanemura🇯🇵

    Baryon asymmetry of the Universe is evaluated in the model originally proposed in Phys. Rev. Lett. 102 (2009) 051805, where Majorana masses of neutrinos are generated via three-loop diagrams composed of additional scalar bosons including the dark matter candidate which is odd under an unbroken $Z_2$ symmetry. In order for the model to include multiple CP-violating phases, we do not impose the softly broken $Z_2$ symmetry imposed in the original model to avoid the flavor-changing neutral current at tree level. Instead, for simplicity, we assume the flavor alignment structure in the Yukawa interactions. We also simply assume the alignment structure in the Higgs potential so that the Higgs couplings coincide with those in the SM at tree level. Under these phenomenological simplifications, the model still contains multiple CP-violating phases. By using destructive interferences among them, it is compatible with the stringent constraint from the electric dipole moment measurements to generate the observed baryon asymmetry along with the scenario of electroweak baryogenesis. We show a benchmark scenario which can explain neutrino mass, dark matter and baryon asymmetry of the universe simultaneously and can satisfy all the other available experimental data. Some phenomenological predictions of the model are also discussed.

    hep-phPRD(2023)·6 citations
12. 12*

    The 2HD+a model: collider, dark matter and gravitational wave signals

    Giorgio Arcadi🇮🇹 · Nico Benincasa🇪🇪 · Abdelhak Djouadi🇪🇸 · Kristjan Kannike🇪🇪

    We perform a comprehensive study of a model in which the Higgs sector is extended to contain two Higgs doublet fields, with the four types of possibilities to couple to standard fermions, as well as an additional light pseudoscalar Higgs boson which mixes with the one of the two doublets. This 2HD+a model includes also a stable isosinglet massive fermion that has the correct thermal relic abundance to account for the dark matter in the Universe. We summarize the theoretical constraints to which the model is subject and then perform a detailed study of the phenomenological constraints. In particular, we discuss the bounds from the LHC in the search for light and heavy scalar resonances and invisible states and those from high precision measurements in the Higgs, electroweak and flavor sectors, addressing the possibility of explaining the deviation from the standard expectation of the anomalous magnetic moment of the muon and the $W$-boson mass recently observed at Fermilab. We also summarize the astrophysical constraints from direct and indirect detection dark matter experiments. We finally conduct a thorough analysis of the cosmic phase transitions and the gravitational wave spectrum that are implied by the model and identify the parameter space in which the electroweak vacuum is reached after single and multiple phase transitions. We then discuss the prospects for observing the signal of such gravitational waves in near future experiments such as LISA, BBO or DECIGO.

    hep-phPRD(2023)·43 citations
13. 13*

    The strong interactions

    H. Leutwyler🇨🇭

    Introductory section for the volume 50 years of Quantum Chromodynamics (edited by F. Gross and E. Klempt, to be published in Eur. Phys. J. C)

    hep-ph0 citations
14. 14*

    Addressing Six Standard Model Problems with Technically Natural Higgs Models

    Martin Rosenlyst🇬🇧

    We aim to study the potential of the recently proposed model framework, called Technically Natural Higgs (TNH), in addressing six fundamental problems in particle physics and cosmology. These questions encompass the electroweak (EW) naturalness problem, neutrino mass generation, nature of the inflaton, the matter-antimatter asymmetry problem, origin of dark matter (DM) and the strong CP problem. We investigate various solutions within the TNH framework for three inflation scenarios $-$ Higgs, Starobinsky and scale-independent inflation. In the minimal TNH model, the Higgs is a mixture of an elementary and a composite state, with a compositeness scale far exceeding the EW scale. Traditionally, this has required an unnatural small vacuum misalignment, but in the TNH framework a novel mechanism enables a technically natural large compositeness scale, even up to the Planck scale. In this model framework, we demonstrate that a scale-invariant version of the minimal TNH model, featuring a special energy scale of around $\mathcal{O}(10^{12})$ GeV, loop-induced by the inflaton, simultaneously yields a technically natural 125-GeV Higgs boson, scotogenic neutrinos, a scale-invariant inflaton and a QCD axion DM candidate. These components dynamically generate the Planck scale and collectively have the potential to address all six open questions.

    hep-phhep-thJHEP(2023)·5 citations
15. 15*

    Disentangling the Seesaw in the Left-Right Model -- An Algorithm for the General Case

    Joshua Kiers🇺🇸 · Ken Kiers🇺🇸 · Alejandro Szynkman🇦🇷 · Tatiana Tarutina🇦🇷

    Senjanovic and Tello have analyzed how one could determine the neutrino Dirac mass matrix in the minimal left-right model, assuming that the mass matrices for the light and heavy neutrinos could be taken as inputs. They have provided an analytical solution for the Dirac mass matrix in the case that the left-right symmetry is implemented via a generalized parity symmetry and that this symmetry remains unbroken in the Dirac Yukawa sector. We extend the work of Senjanovic and Tello to the case in which the generalized parity symmetry is broken in the Dirac Yukawa sector. In this case the elegant method outlined by Senjanovic and Tello breaks down and we need to adopt a numerical approach. Several iterative approaches are described; these are found to work in some cases but to be highly unstable in others. A stable, prescriptive numerical algorithm is described that works in all but a vanishingly small number of cases. We apply this algorithm to numerical data sets that are consistent with current experimental constraints on neutrino masses and mixings. We also provide some additional context and supporting explanations for the case in which the parity symmetry is unbroken.

    hep-phPRD(2023)·7 citations
16. 16*

    Detection possibility of a Pseudo-FIMP in presence of a thermal WIMP

    Subhaditya Bhattacharya🇮🇳 · Jayita Lahiri🇩🇪 · Dipankar Pradhan🇮🇳

    A dark matter (DM) having feeble interaction with the visible sector can thermalise via substantial interaction with a Weakly Interacting Massive Particle (WIMP). Such DM candidates are categorised as pseudo-FIMP (pFIMP). pFIMP can provide both direct and indirect search prospects via WIMP loop. This work focuses into such possibilities. We provide all such one loop graphs involving scalar, fermion and vector boson particles via which pFIMP can interact with the Standard Model assuming both of them are stabilised via ${\mathbb{Z}}_2\otimes {\mathbb{Z}}_2^{\prime }$ symmetries. We elaborate upon a model where a fermion DM acts as WIMP and a scalar singlet acts as pFIMP having negligible Higgs portal interaction and substantial conversion via Yukawa interaction. We study in details the loop induced direct and indirect search prospects of the pFIMP in the relic density allowed region of the model.

    hep-phPRD(2024)·7 citations
17. 17*

    Light Axiodilatons: Matter Couplings, Weak-Scale Completions and Long-Distance Tests of Gravity

    Philippe Brax🇫🇷 · Cliff Burgess🇨🇦 · Fernando Quevedo🇬🇧

    We consider the physical implications of very light axiodilatons motivated by a novel mechanism to substantially reduce the vacuum energy proposed in arXiv:2110.10352. We address the two main problems concerning the light axiodilaton that appears in the low-energy limit, namely that the axion has a very low decay constant $f_a\sim$ eV (as read from its kinetic term) and that the dilaton is subject to bounds that are relevant to tests of GR once ${\rho }_{\mathrm{vac}}\le 10^{-80}{M}_p^4$. We show that eV scale axion decay constants need not be a problem by showing how supersymmetric extra dimensions provide a sample unitarization for axion physics above eV scales for which non-anomalous matter/axiodilaton couplings can really have gravitational strength, showing how naive EFT reasoning can mistakenly overestimates axion interactions at eV. When axions really do couple strongly at eV scales we identify the dimensionless interaction in the UV completion that is also O(1), and how axion energy-loss bounds map onto known extra-dimensional constraints. We find a broad new class of exact exterior solutions to the vacuum axiodilaton equations and knowledge of axiodilaton-matter couplings also allows us to numerically search for interior solutions that match to known exterior solutions that can evade solar-system tests. We find no examples that do so, but also identify potential new candidate mechanisms for reducing the effective dilaton-matter coupling to gravitating objects without also undermining the underlying suppression of ${\rho }_{\mathrm{vac}}$.

    hep-phhep-thJCAP(2023)·18 citations
18. 18*

    Holographic collisions in large $D$ effective theory

    Raimon Luna🇪🇸 · Mikel Sanchez-Garitaonandia🇫🇷

    We study collisions of Gaussian mass-density blobs in a holographic plasma, using a large $D$ effective theory, as a model for holographic shockwave collisions. The simplicity of the effective theory allows us to perform the first 4+1 collisions in Einstein-Maxwell theory, which are dual to collisions of matter with non-zero baryonic number. We explore several collision scenarios with different blob shapes, impact parameters and charge values and find that collisions with impact parameter below the transverse width of the blobs are equivalent under rescaling. We also observe that charge weakly affects the rest of quantities. Finally, we study the entropy generated during collisions, both by charge diffusion and viscous dissipation. Multiple stages of linear entropy growth are identified, whose rates are not independent of the initial conditions.

    ↳ hep-thgr-qchep-phJHEP(2023)·6 citations
19. 19*

    Nonexistence of quantum black and white hole horizons in an improved dynamic approach

    Wen-Cong Gan🇨🇳 · Xiao-Mei Kuang🇨🇳 · Zhen-Hao Yang🇨🇳 · Yungui Gong🇨🇳 · Anzhong Wang🇺🇸 · Bin Wang🇨🇳

    In this paper, we study the quantum geometric effects near the locations where classical black hole horizons used to appear in Einstein's classical theory, within the framework of an improved dynamic approach, in which the internal region of a black hole is modeled by the Kantowski-Sachs (KS) spacetime and the two polymerization parameters are functions of the phase space variables. Our detailed analysis shows that the effects are so strong that black and white hole horizons of the effective quantum theory do not exist at all and instead are replaced by transition surfaces, across which the metric coefficients and their inverses are smooth and remain finite, as are the corresponding curvatures, including the Kretschmann scalar. These surfaces always separate trapped regions from anti-trapped regions. The number of such surfaces is infinite, so the corresponding KS spacetimes become geodesically complete, and no black and white hole-like structures exist in this scheme.

    ↳ gr-qcastro-ph.GAhep-phhep-thSCPMA(2024)·22 citations
20. 20*

    On the correlation functions in stable first-order relativistic hydrodynamics

    Navid Abbasi🇨🇳 · Ali Davody🇺🇸 · Sara Tahery🇨🇳

    First-order relativistic conformal hydrodynamics in a general (hydrodynamic) frame is characterized by a shear viscosity coefficient and two UV-regulator parameters. Within a certain range of these parameters, the equilibrium is stable and propagation is causal. In this work we study the correlation functions of fluctuations in this theory. We first compute hydrodynamic correlation functions in the linear response regime. Then we use the linear response results to explore the analytical structure of response functions beyond the linear response. A method is developed to numerically calculate the branch cut structure from the well-known Landau equations. We apply our method to the shear channel and find the branch cuts of a certain response function, without computing the response function itself. We then solve the Landau equations analytically and find the threshold singularities of the same response function. Using these results, we achieve the leading singularity in momentum space, by which, we find the long-time tail of the correlation function. The results turn out to be in complete agreement with the loop calculations in effective field theory.

    ↳ hep-thhep-phnucl-thPRD(2024)·15 citations
21. 21*

    Effect of color superconductivity on the mass of hybrid neutron stars in an effective model with pQCD asymptotics

    David Blaschke🇵🇱 · Udita Shukla🇵🇱 · Oleksii Ivanytskyi🇵🇱 · Simon Liebing🇩🇪

    The effective cold quark matter model by Alford, Braby, Paris and Reddy (ABPR) is used as a tool for discussing the effect of the size of the pairing gap in three-flavor (CFL) quark matter on the maximum mass of hybrid neutron stars (NSs). This equation of state (EOS) has three parameters which we suggest to determine by comparison with a nonlocal NJL model of quark matter in the nonperturbative domain. We show that due to the momentum dependence of the pairing which is induced by the nonlocality of the interaction, the effective gap parameter in the EOS model is well approximated by a constant value depending on the diquark coupling strength in the NJL model Lagrangian. For the parameter $a_4=1-2{\alpha }_s/\pi$ a constant value below about \num{0.4} is needed to explain hybrid stars with ${\mathrm{M}}_{\max }\gtrsim 2.0{\mathrm{M}}_{\odot }$, which would translate to an effective constant ${\alpha }_s\sim 1$. The matching point with a running coupling at the 1-loop $\beta$ function level is found to lie outside the range of chemical potentials accessible in NS interiors. A dictionary is provided for translating the free parameters of the nlNJL model to those of the ABPR model. Both models are shown to be equivalent in the nonperturbative domain but the latter one allows to quantify the transition to the asymptotic behaviour in accordance with perturbative QCD. We provide constraints on parameter sets that fulfill the $2{\mathrm{M}}_{\odot }$ mass constraint for hybrid NSs, as well as the low tidal deformability constraint from GW170817 by a softening of the EOS on the hybrid NS branch with an early onset of deconfinement at ${\mathrm{M}}_{\mathrm{onset}}<1.4{\mathrm{M}}_{\odot }$. We find that the effective constant pairing gap should be around 100 MeV but not exceed values of about 130 MeV because a further increase of the gap would entail a softening of the EOS and contradict the $2{\mathrm{M}}_{\odot }$ mass constraint.

    ↳ nucl-thastro-ph.HEhep-phPRD(2023)·27 citations
22. 22*

    Bump-hunting in the diffuse flux of high-energy cosmic neutrinos

    Damiano F. G. Fiorillo🇩🇰 · Mauricio Bustamante🇩🇰

    The origin of the bulk of the high-energy astrophysical neutrinos seen by IceCube, with TeV--PeV energies, is unknown. If they are made in photohadronic, i.e., proton-photon, interactions in astrophysical sources, this may manifest as a bump-like feature in their diffuse flux, centered around a characteristic energy. We search for evidence of this feature, allowing for variety in its shape and size, in 7.5 years of High-Energy Starting Events (HESE) collected by the IceCube neutrino telescope, and make forecasts using larger data samples from upcoming neutrino telescopes. Present-day data reveals no evidence of bump-like features, which allows us to constrain candidate populations of photohadronic neutrino sources. Near-future forecasts show promising potential for stringent constraints or decisive discovery of bump-like features. Our results provide new insight into the origins of high-energy astrophysical neutrinos, complementing those from point-source searches.

    ↳ astro-ph.HEhep-exhep-phPRD(2023)·24 citations
23. 23*

    Redundancies and Profundities

    Kyle Singh

    We reevaluate the status of the gauge principle and reposition it as an intermediary structure dependent on the initial conditions we endow on our theory. We explore how the gauge symmetry manifests in the context of basic quantum electrodynamics, spontaneous symmetry breaking and the modern scattering amplitudes program. We also investigate the addition of an auxiliary field in ${\varphi }^4$ theory and see how the dynamics are altered. Modal language is pointed to and utilized as a convenient way to articulate the weight gauge symmetry demands in our theories as well as the principles of locality and Lorentz invariance. A shifting scale ontology is introduced with regards to the gauge principle and other structures of Quantum Field Theory in general.

    ↳ physics.hist-phhep-ph1 citation

* 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.