Thu·Apr 18, 2024Thursday·April 18, 2024

1. 01*

   Polarization and kinematic properties of the splitting functions $q\to W^{\pm }+q^{\prime }$ and $q\to Z^0+q$

   Alsu G. Bagdatova🇷🇺 · Sergey P. Baranov🇷🇺

   We consider the processes $g\to W+q^{\prime }$ and $q\to Z+q$ and derive the respective splitting functions as functions of two kinematic variables: the longitudinal momentum fraction $z$ and transverse momentum $p_T$ of the produced bosons with respect to the parent quark. We take into account kinematic (phase space) restrictions connected with nonzero masses of the gauge bosons and with limited initial energy. We separately consider three different polarization states of the bosons.

   hep-phMod.Phys.Lett.A(2025)·2 citations
2. 02*

   Asymmetries in invisible Dark Matter mediator production associated with $t\bar{t}$ final states

   E. Chalbaud🇵🇹 · Rui M. Silva🇵🇹 · António Onofre🇵🇹 · Ricardo Gonçalo🇵🇹 · Miguel C. N. Fiolhais🇵🇹

   In this paper, we propose two sets of different CP-sensitive observables inspired by the Higgs production in association with the top quark. We employ a Dark Matter simplified model that couples a scalar mediator with top quarks. The reconstruction of the kinematic variables is presented at NLO accuracy for events associated with this massive scalar particle, which is assumed to be vanishing to invisible decays in a detector such as ATLAS. We build these observables by taking advantage of the similarity between the scalar coupling with the top quark and the factorization theorem in the total scattering amplitude, in order to represent the basis in which the phase space is parameterized. A twofold approach employs the direct implementation of the four-momentum phase space measure in building CP sensitive observables such as $b_2$ for the Higgs, and the spin polarization of the top-quark decays in the narrow width approximation for the employed model. We studied the asymmetries of these distributions to test for any improvement in increasing the exclusion region for the $g_{u_{33}}^S-g_{u_{33}}^P$ parameters associated with this vanishing scalar particle. We have found no significant effect in the exclusion limits by using the forward-backward asymmetry distributions and the full-shaped ones. Considering the case of an invisible mediator with mass of 10${}^{-2}$ GeV for a luminosity of 300 fb${}^{-1}$ expected at the end of Run 3, the best limits for $g_{u_{33}}^S$ and $g_{u_{33}}^P$ at NLO accuracy were obtained using the variables ${\tilde{b}}_2^{\hat{y}}$ and $b_2$ respectively, with corresponding limits set to $[-0.0425,0.0425]$ and $[-0.83,0.83]$ at $68\%$ CL.

   hep-phPRD(2024)·2 citations
3. 03*

   Magnetic Monopole Phenomenology at Future Hadron Colliders

   Ijaz Ahmed🇵🇰 · Sidra Swalheen🇵🇰 · Mansoor Ur Rehman🇵🇰 · Rimsha Tariq🇵🇰

   In the grand tapestry of Physics, the magnetic monopole is a holy grail. Therefore, numerous efforts are underway in search of this hypothetical particle at CMS, ATLAS and MoEDAL experiments of LHC by employing different production mechanisms. The cornerstone of our comprehension of monopoles lies in Dirac's theory which outlines their characteristics and dynamics. Within this theoretical framework, an effective $U(1)$ gauge field theory, derived from conventional models, delineates the interaction between spin magnetically-charged fields and ordinary photons under electric-magnetic dualization. The focus of this paper is the production of magnetic monopoles from Drell-Yan and the Photon-Fusion mechanisms to produce velocity-dependent scalar, fermionic, and vector monopoles of spin angular momentum $0,\frac{1}{2},1$ respectively at LHC. A computational work is performed to compare the monopole pair-production cross-sections for both methods at different center-of-mass energies ($\sqrt{s}$) with various magnetic dipole moments. The comparison of kinematic distributions of monopoles at Parton and reconstructed level are demonstrated including both DY and PF mechanisms. Extracted results showcase how modern machine-learning techniques can be used to study the production of magnetic monopoles at the Future proton-proton Particle Colliders at 100 TeV. We demonstrate the observability of magnetic monopoles against the most relevant Standard Model background using multivariate methods such as Boosted Decision Trees (BDT), Likelihood, and Multilayer Perceptron (MLP). This study compares the performance of these classifiers with traditional cut-based and counting approaches, proving the superiority of our methods.

   hep-phJ.Phys.G(2024)·1 citation
4. 04*

   Ultra-light Dark Matter Limits from Astrophysical Neutrino Flavor

   Carlos A. Argüelles🇺🇸 · Kareem Farrag🇯🇵 · Teppei Katori🇬🇧

   Ultra-light dark matter is a class of dark matter models where the mass of the dark matter particle is very small and the dark matter behaves as a classical field pervading our galaxy. If astrophysical neutrinos interact with ultra-light dark matter, these interactions would produce a matter potential in our galaxy which may cause anomalous flavor conversions. Recently, IceCube high-energy starting event flavor measurements are used to set stringent limits on isotropic Lorentz violating fields under the Standard-Model Extension framework. We apply the IceCube Lorentz violation limits to set limits on neutrino - ultra-light dark matter couplings. We assume the dark matter field undergoes fast oscillations in our galaxy, yielding neutrino interactions with dark matter that broaden and smear the observed flavor structure of astrophysical neutrinos at IceCube. The constraints we obtain are an order of magnitude tighter than current and future terrestrial neutrino experimental limits. The sensitivity of ultra-light dark matter can be further improved in the near future by new particle identification algorithms in IceCube and the emergence of next-generation neutrino telescopes.

   hep-ph13 citations
5. 05*

   Prospects for detecting the hidden-strange pentaquarklike state $N^{\ast }(2080)$ in the ${\pi }^{-}p\to \varphi n$ reaction

   Xiao-Yun Wang🇨🇳 · Hui-Fang Zhou🇨🇳 · Xiang Liu🇨🇳

   In this work, the production of the hidden-strange pentaquarklike state $N^{\ast }(2080)$ via the ${\pi }^{-}p$ scattering process is studied by the effective Lagrangian approach. Concretely, we consider the $\rho$ meson exchange of $t$-channel and the nucleon exchange of $u$-channel, which are treated as the background terms, and take into account the contribution of the $N^{\ast }(2080)$ via the $s$-channel as a signal term. By global fitting of the total and differential cross sections of the ${\pi }^{-}p\to \varphi n$ process, it is shown that the $N^{\ast }(2080)$ contributes an obvious peak at the threshold energy point of the differential cross section at the forward angle ($\cos \theta =1$), which provides clues to the detection of the $N^{\ast }(2080)$ by the ${\pi }^{-}p$ scattering process. However, due to the limited accuracy of the experimental data, it is an objective limitation for us to determine the properties of the $N^{\ast }(2080)$ by the ${\pi }^{-}p$ scattering process. Therefore, more accurate experimental measurements of the ${\pi }^{-}p\to \varphi n$ reaction are highly desirable, and we have also proposed that correlation measurements can be performed on J-PARC, AMBER, and future HIKE and HIAF meson beam experiments.

   hep-phPRD(2024)·7 citations
6. 06*

   Improved analysis of the decay width of $t\to Wb$ up to N${}^3$LO QCD corrections

   Jiang Yan🇨🇳 · Xing-Gang Wu🇨🇳 · Hua Zhou🇨🇳 · Hong-Tai Li🇨🇳 · Jing-Hao Shan🇨🇳

   In this paper, we analyze the top-quark decay $t\to Wb$ up to next-to-next-to-next-to-leading order (N${}^3$LO) QCD corrections. For the purpose, we first adopt the principle of maximum conformality (PMC) to deal with the initial pQCD series. Then we adopt the Bayesian analysis approach, which quantifies the unknown higher-order terms' contributions in terms of a probability distribution, to estimate the possible magnitude of the uncalculated N${}^4$LO-terms. In our calculation, an effective strong coupling constant ${\alpha }_s(Q_{\ast })$ is determined by using all non-conformal $\{{\beta }_i\}$ terms associated with the renormalization group equation. This leads to a next-to-leading-log PMC scale $Q_{\ast }^{(\mathrm{NLL})}=10.3048$ GeV, which can be regarded as the correct momentum flow of the process. Consequently, we obtain an improved scale-invariant pQCD prediction for the top-quark decay width, e.g. ${\Gamma }_t^{\mathrm{tot}}=1.3120\pm 0.0038$ GeV, whose error is the squared average of the uncertainties from the decay width of $W$-boson $\Delta {\Gamma }_W=\pm 0.042$ GeV, the coupling constant $\Delta {\alpha }_s(m_Z)=\pm 0.0009$, and the predicted N${}^4$LO-terms. The magnitude of the top-quark pole mass greatly affects the total decay width. By further taking the PDG top-quark pole mass error from cross-section measurements into consideration, e.g. $\Delta m_t=\pm 0.7$ GeV, we obtain ${\Gamma }_t^{\mathrm{tot}}=1.3120_{-0.0192}^{+0.0194}$ GeV.

   hep-phPRD(2024)·12 citations
7. 07*

   Spectrum of $[8{]}_{[c\bar{s}]}\otimes [8{]}_{[q\overline{q^{\prime }}]}$ systems with quantum numbers $J^P=0^{\pm }$ and $1^{\pm }$

   Si-Nuo Li🇨🇳 · Liang Tang🇨🇳

   Inspired by the recent experimental progress on the $T_{c\bar{s}0}^a(2900{)}^{0/++}$, the fully open tetraquark spectrum with the configuration of $[8{]}_{[c\bar{s}]}\otimes [8{]}_{[q\overline{q^{\prime }}]}$ is systematically investigated by the QCD sum rules. In this article, we concentrate on the quantum numbers $J^P=0^{+}/0^{-}/1^{+}/1^{-}$. Firstly, we construct four scalar currents ($J^P=0^{+}$) in the form of $[8{]}_{[c\bar{s}]}\otimes [8{]}_{[u\bar{d}]}$ type tetraquark structure and perform the analysis of the QCD sum rules, where we consider the leading order contributions up to dimension 11 in the operator product expansion and retain contributions linear in the strange quark mass $m_s$. Our results, $M_{0^{+}}^A=2.91_{-0.20}^{+0.20}\text{GeV}$ and $M_{0^{+}}^C=2.98_{-0.21}^{+0.20}\text{GeV}$, are consistent with the experimentally discovered $T_{c\bar{s}0}^a(2900{)}^{++}$ within error margins. Thus, our calculation supports classifying $T_{c\bar{s}0}^a(2900{)}^{++}$ as a tetraquark state with the $[8{]}_{[c\bar{s}]}\otimes [8{]}_{u\bar{d}}$ color configuration. Moreover, on the basis of $J^P=0^{+}$, we also study tetraquark states with quantum numbers $J^P=0^{-}$, $1^{+}$, and $1^{-}$, predicting two new hadronic states awaiting experimental verification for each quantum number. Their masses are as follows: $M_{0^{-}}^A=3.45_{-0.10}^{+0.12}\text{GeV}$, $M_{0^{-}}^D=3.20_{-0.19}^{+0.17}\text{GeV}$, $M_{1^{+}}^A=2.95_{-0.19}^{+0.19}\text{GeV}$, $M_{1^{+}}^C=2.95_{-0.19}^{+0.19}\text{GeV}$, $M_{1^{-}}^A=3.23_{-0.10}^{+0.11}\text{GeV}$ and $M_{1^{-}}^D=3.23_{-0.11}^{+0.09}\text{GeV}$. With advances in experimental techniques and accumulation of new data, these predicted results are hoped to be confirmed in future experiments.

   hep-ph14 citations
8. 08*

   Predicting isovector charmonium-like states from X(3872) properties

   Zhen-Hua Zhang🇨🇳 · Teng Ji🇩🇪 · Xiang-Kun Dong🇩🇪 · Feng-Kun Guo🇨🇳 · Christoph Hanhart🇩🇪 · Ulf-G. Meißner🇩🇪 · Akaki Rusetsky🇩🇪

   Using chiral effective field theory, we predict that there must be isovector charmonium-like $D{\bar{D}}^{\ast }$ hadronic molecules with $J^{PC}=1^{++}$ denoted as $W_{c1}$. The inputs are the properties of the $X(3872)$, including its mass and the ratio of its branching fractions of decays into $J/\psi {\rho }^0$ and $J/\psi \omega$. The predicted states are virtual state poles of the scattering matrix, pointing at a molecular nature of the $X(3872)$ as well as its spin partners. They should show up as either a mild cusp or dip at the $D{\bar{D}}^{\ast }$ thresholds, explaining why they are elusive in experiments. The so far negative observation also indicates that the $X(3872)$ is either a bound state with non-vanishing binding energy or a virtual state, only in these cases the $X(3872)$ signal dominates over that from the $W_{c1}^0$. The pole positions are $3881.2_{-0.0}^{+0.8}-i1.6_{-0.9}^{+0.7}$ MeV for $W_{c1}^0$ on the fourth Riemann sheet of the $D^0{\bar{D}}^{\ast 0}$-$D^{+}{D}^{\ast -}$ coupled-channel system, and $3866.9_{-7.7}^{+4.6}-i(0.07\pm 0.01)$ MeV for $W_{c1}^{\pm }$ on the second Riemann sheet of the $(D{\bar{D}}^{\ast }{)}^{\pm }$ single-channel system. The findings imply that the peak in the $J/\psi {\pi }^{+}{\pi }^{-}$ invariant mass distribution is not purely from the $X(3872)$ but contains contributions from $W_{c1}^0$ predicted here. The states should have isovector heavy quark spin partners with $J^{PC}=0^{++}$, $2^{++}$ and $1^{+-}$, with the last one corresponding to $Z_c$. We suggest to search for the charged $0^{++}$, $1^{++}$ and $2^{++}$ states in $J/\psi {\pi }^{\pm }{\pi }^0$.

   hep-phhep-exhep-latJHEP(2024)·35 citations
9. 09*

   Local clustering of relic neutrinos: Comparison of kinetic field theory and the Vlasov equation

   Emil Brinch Holm🇩🇰 · Stefan Zentarra🇨🇭 · Isabel M. Oldengott🇧🇪

   Gravitational clustering in our cosmic vicinity is expected to lead to an enhancement of the local density of relic neutrinos. We derive expressions for the neutrino density, using a perturbative approach to kinetic field theory and perturbative solutions of the Vlasov equation up to second order. Our work reveals that both formalisms give exactly the same results and can thus be considered equivalent. Numerical evaluation of the local relic neutrino density at first and second order provides some fundamental insights into the frequently applied approach of linear response to neutrino clustering (also known as the Gilbert equation). Against the naive expectation, including the second-order contribution does not lead to an improvement of the prediction for the local relic neutrino density but to a dramatic overestimation. This is because perturbation theory breaks down in a momentum-dependent fashion and in particular for densities well below unity.

   hep-phastro-ph.COJCAP(2024)·14 citations
10. 10*

    Accreting Black Holes in Dark Matter Halos

    Sobhan Kazempour🇨🇳 · Sichun Sun🇨🇳 · Chengye Yu🇨🇳

    We examine the thin accretion disk behaviors surrounding black holes embedded in cold dark matter halos and scalar field dark matter halos. We first calculate the event horizons and derive the equations of motion and effective potential in black hole geometries with different dark matter halos. We then compute the specific energy, specific angular momentum, and angular velocity of particles moving along circular orbits. We also derive the effective potentials to find the locations of the innermost stable circular orbit (ISCO) and compare them to the Schwarzschild and Kerr black holes without the dark matter haloes. We also use the observed ISCO of the supermassive black hole at the Galactic Center of the Milky Way, Sagittarius A*, to constrain the dark matter halos.

    hep-phastro-ph.COgr-qcPRD(2024)·9 citations
11. 11*

    Two-loop electroweak corrections to the Higgs boson rare decay process $H\to Z\gamma$

    Zi-Qiang Chen🇨🇳 · Long-Bin Chen🇨🇳 · Cong-Feng Qiao🇨🇳 · Ruilin Zhu🇨🇳

    Recently, the ATLAS and CMS collaborations jointly announced the first evidence of the rare Higgs boson decay channel $H\to Z\gamma$, with a ratio of $2.2\pm 0.7$ times the leading order standard model (SM) prediction. In order to face this challenge, it is urgent to produce an even more accurate calculation within the SM. To this end, we calculate in this paper the next-to-leading order (NLO) electroweak (EW) corrections to the $H\to Z\gamma$ process, in which the NLO quantum chromodynamics (QCD) corrections were found tiny. Our calculation finds that the inclusion of NLO EW corrections greatly enhances the prediction reliability. To tame the theoretical uncertainty, we adopt five different renormalization schemes. Combining our result with previous NLO QCD corrections and the signal-background interference, we conclude that the excess in $H\to Z\gamma$ cannot be explained within the SM. In fact, the incompatibility between the SM prediction and the LHC measurement of the concerned process is exacerbated upon considering the higher order EW corrections, which implies that something beyond the SM could be involved.

    hep-phPRD(2024)·18 citations
12. 12*

    Inverse problem in energy-dependent potentials using semiclassical methods

    Saulo Albuquerque🇧🇷 · Sebastian H. Völkel🇩🇪 · Kostas D. Kokkotas🇩🇪

    Wave equations with energy-dependent potentials appear in many areas of physics, ranging from nuclear physics to black hole perturbation theory. In this work, we use the semi-classical WKB method to first revisit the computation of bound states of potential wells and reflection/transmission coefficients in terms of the Bohr-Sommerfeld rule and the Gamow formula. We then discuss the inverse problem, in which the latter observables are used as a starting point to reconstruct the properties of the potentials. By extending known inversion techniques to energy-dependent potentials, we demonstrate that so-called width-equivalent or WKB-equivalent potentials are not isospectral anymore. Instead, we explicitly demonstrate that constructing quasi-isospectral potentials with the inverse techniques is still possible. Those reconstructed, energy-independent potentials share key properties with the width-equivalent potentials. We report that including energy-dependent terms allows for a rich phenomenology, particularly for the energy-independent equivalent potentials.

    hep-phgr-qcquant-phPRD(2024)·7 citations
13. 13*

    A global analysis of ${\pi }^0$, $K_S^0$ and $\eta$ fragmentation functions with BESIII data

    Mengyang Li🇨🇳 · Daniele Paolo Anderle🇨🇳 · Hongxi Xing🇨🇳 · Yuxiang Zhao🇨🇳

    In this research, we conduct a global QCD analysis of fragmentation functions (FFs) for neutral pions (${\pi }^0$), neutral kaons ($K_S^0$), and eta mesons ($\eta$), utilizing world data of single inclusive hadron production in $e^{+}{e}^{-}$ annihilation involving the most recent BESIII data with low collision energy, to test the operational region of QCD collinear factorization for single inclusive hadron production. We found that the QCD-based analysis at next-to-next-to leading order in perturbative QCD with parameterized higher-twist effects can explain both existing high-energy world data and the BESIII new measurements, while the latter cannot be explained with existing FFs extracted with high-energy data. To investigate the higher-twist contributions to this discrepancy, a direct functional approach is employed, providing testing framework for characterizing the experimental results over a wide range of energy scales, from low to high, thus extending the classical theoretical models to the BESIII domain.

    hep-phhep-exPRD(2025)·14 citations
14. 14*

    Chiral-odd GPDs in the bag model

    Kemal Tezgin🇺🇸 · Brean Maynard🇺🇸 · Peter Schweitzer🇺🇸

    A study of chiral-odd generalized parton distributions (GPDs) of the nucleon is presented in the bag model demonstrating that in this model all four chiral-odd GPDs are non-zero contrary to other claims in literature. The bag model results for the GPDs $H_T^q(x,\xi ,t)$, $E_T^q(x,\xi ,t)$, ${\tilde{H}}_T^q(x,\xi ,t)$ agree with other models within a typical quark model accuracy. We present one of the few quark model calculations where polynomiality is satisfied and the sum rule $\int dx{\tilde{E}}_T^q(x,\xi ,t)=0$ holds. We confront our results with predictions from the large-$N_c$ limit, and with lattice QCD calculations. We conclude that the bag model successfully catches the main features of chiral-odd GPDs.

    hep-phPRD(2024)·10 citations
15. 15*

    Explaining Fermions Mass and Mixing Hierarchies through $U(1{)}_X$ and $Z_2$ Symmetries

    Abdul Rahaman Shaikh🇮🇳 · Rathin Adhikari🇮🇳

    For understanding the hierarchies of fermion masses and mixing, we extend the Standard Model gauge group with \( U(1)_X \) and \( Z_2 \) symmetry. The field content of the Standard Model is augmented by three heavy right-handed neutrinos, two new scalar singlets, and a scalar doublet. \( U(1)_X \) charges of different fields are determined after satisfying anomaly cancellation conditions. In this scenario, the fermion masses are generated through higher-dimensional effective operators with \( O(1) \) Yukawa couplings. The small neutrino masses are obtained through type-1 seesaw mechanism using the heavy right-handed neutrino fields, whose masses are generated by the new scalar fields. We discuss the flavour-changing neutral current processes that arise due to the sequential nature of \( U(1)_X \) symmetry. We have written effective higher-dimensional operators in terms of renormalizable dimension-four operators by introducing vector-like fermions.

    hep-phCommun.Theor.Phys.(2025)·4 citations
16. 16*

    Photoproduction of QED bound states in future electron-ion colliders

    Reinaldo Francener🇧🇷 · Victor P. Goncalves🇧🇷 · Bruno D. Moreira🇧🇷 · Kaique A. Santos🇧🇷

    In this work we perform an exploratory study of the photoproduction of singlet QED bound states $(l^{-}{l}^{+}{)}_S$ in electron - ion collisions at the EicC, EIC and LHeC energies. The total cross - sections, event rates per year and rapidity distributions associated with the parapositronium, paramuonium and paratauonium production are estimated. Moreover, we consider the decay of these states in a two - photon system and implement kinematical cuts on the rapidities and energies of the photons in the final state. We demonstrate the paramuonium can, in principle, be observed for the first time in all these colliders and that the EIC is a potential collider to discover the paratauonium state.

    hep-phnucl-thPLB(2024)·8 citations
17. 17*

    A Partially Fixed Background Field Gauge

    Anders Eller Thomsen🇨🇭

    We examine the incorporation of gauge symmetries in the modern effective field theory (EFT) matching paradigm with a particular focus on spontaneously broken symmetries. The presence of gauge symmetries entails the introduction of gauge-fixing terms in matching calculations, which may prevent (partial) cancellation between loops from the underlying theory and those of the EFT, thereby preventing the establishment of a hard-region matching formula. While this is not an issue when using the background field (BF) gauge for unbroken gauge theories, we find ourselves unable to demonstrate the cancellation with the ordinary BF gauge in spontaneously broken gauge theories when the massive vectors are heavy and decouple from the theory. As a convenient alternative, we construct a partially fixed BF gauge that, in addition to being simpler than the ordinary BF gauge, allows us to prove a hard-region matching formula.

    hep-phJHEP(2024)·12 citations
18. 18*

    The Field Theory Axiverse

    Stephon Alexander🇺🇸 · Tucker Manton🇺🇸 · Evan McDonough🇨🇦

    Axion and axion-like particles (ALPs) are a prominent candidate for physics beyond the Standard Model, and can play an important role in cosmology, serving as dark matter or dark energy, or both, drawing motivation in part from the string theory axiverse. Axion-like particles (ALPs) can also arise as composite degrees of freedom following chiral symmetry breaking in a dark confining gauge theory, analogous to the Standard Model (SM) pion. A dark sector with arbitrary $N_f$ flavors of dark quarks leads to $N_f^2-1$ axion-like states, effectively a field theory axiverse (or '$\pi$-axiverse'). A portal to the visible sector can be achieved through the standard kinetic mixing between the dark photon and SM photon, generating millicharges for the dark quarks and consequently couplings, both parity-even and parity-odd, between the SM and the dark pions. This scenario has been studied for the $N_f=2$ case and more recently for a dark Standard Model with $N_f=6$. In this work, we study the spectrum of this field theory axiverse for an arbitrary number of flavors, and apply this to the example $N_f=10$. We calculate the couplings to the SM photon analogous to the conventional axion-photon coupling, including the $N_f$ and $N_c$ dependence, and compute the present and future constraints on the $N_f=10$, $N_c=3$, $\pi$-axiverse. We elucidate the accompanying 'bary-verse' of superheavy dark baryons, namely an ensemble of charged and neutral dark baryons with a mass set by the dark pion decay constant.

    hep-phastro-ph.COhep-thPRD(2024)·24 citations
19. 19*

    Neutrino Masses in the Mirror Twin Higgs with Spontaneous ${\mathbb{Z}}_2$ Breaking

    Pedro Bittar🇧🇷 · Davi B. Costa🇺🇸 · Gustavo Burdman🇧🇷

    We introduce a mirror twin Higgs model with spontaneous ${\mathbb{Z}}_2$ symmetry breaking that ameliorates the constraints in twin Higgs cosmology and, at the same time, generates the Standard Model neutrino masses. The model features an $SU(2)$ triplet with hypercharge $1$ alongside its twin counterpart. Spontaneous breaking of both ${\mathbb{Z}}_2$ and electroweak symmetry occurs in the scalar sector. The Standard Model neutrinos acquire small masses through the type-II seesaw mechanism. In contrast, their twin counterparts acquire large masses, effectively addressing the dark radiation problem in mirror twin Higgs scenarios. We study the impact of the model on the $N_{eff.}$ constraints, as well as on collider phenomenology.

    hep-phhep-exJHEP(2024)·4 citations
20. 20*

    Exact unified tetraquark equations

    B. Blankleider🇦🇺 · A. N. Kvinikhidze🇬🇪

    Recently we formulated covariant equations describing the tetraquark in terms of an admixture of two-body states $D\bar{D}$ (diquark-antidiquark), $MM$ (meson-meson), and three-body-like states where two of the quarks are spectators while the other two are interacting [Phys. Rev. D 107, 094014 (2023)]. A feature of these equations is that they unify descriptions of seemingly unrelated models of the tetraquark, like, for example, the $D\bar{D}$ model of the Moscow group [Faustov et al., Universe 7, 94 (2021)] and the coupled channel $D\bar{D}-MM$ model of the Giessen group [Heupel et al., Phys. Lett. B718, 545 (2012)]. Here we extend these equations to the exact case where $q\bar{q}$ annihilation is incorporated explicitly, and all previously neglected terms (three-body forces, non-pole contributions to two-quark t matrices, etc.) are taken into account through the inclusion of a single $q\bar{q}$ potential $\Delta$.

    hep-phnucl-thFew Body Syst.(2024)·2 citations
21. 21*

    Vector meson production in ultraperipheral heavy ion collisions

    Björn Schenke🇺🇸 · Heikki Mäntysaari🇫🇮 · Farid Salazar🇺🇸 · Chun Shen🇺🇸 · Wenbin Zhao🇺🇸

    We review model calculations of exclusive vector meson production in ultraperipheral heavy ion collisions. We highlight differences and similarities between different dipole models and leading twist shadowing calculations. Recent color glass condensate calculations are presented with focus on effects from nuclear structure and azimuthal anisotropies driven by interference effects.

    ↳ nucl-thhep-phnucl-exPhys.Proc.UPC(2024)·7 citations
22. 22*

    Polarization phenomenon in heavy-ion collisions

    Takafumi Niida🇯🇵 · Sergei A. Voloshin🇺🇸

    The strongly interacting system created in ultrarelativistic nuclear collisions behaves almost as an ideal fluid with rich patterns of the velocity field exhibiting strong vortical structure. Vorticity of the fluid, via spin-orbit coupling, leads to particle spin polarization. Due to the finite orbital momentum of the system, the polarization on average is not zero; it depends on the particle momenta reflecting the spatial variation of the local vorticity. In the last few years, this field experienced a rapid growth due to experimental discoveries of the global and local polarizations. Recent measurements triggered further development of the theoretical description of the spin dynamics and suggestions of several new mechanisms for particle polarization. In this review, we focus mostly on the experimental results. We compare the measurements with the existing theoretical calculations but try to keep the discussion of possible underlying physics at the qualitative level. Future measurements and how they can help to answer open theoretical questions are also discussed. We pay a special attention to the employed experimental methods, as well as to the detector effects and associated corrections to the measurements.

    ↳ nucl-exhep-phnucl-thIJMPE(2024)·53 citations
23. 23*

    Extraction of nonperturbative parameters for $D^{(\ast )}$ mesons from lattice data

    Alexey Nefediev🇸🇮

    Recent data for the masses of $D$ and $D^{\ast }$ mesons determined using methods of lattice QCD for several values of the charm quark mass different from its physical mass are analysed in Heavy Quark Effective Theory. Nonperturbative parameters are extracted that arise at order $\mathcal{O}(1/m_c)$ in the heavy-quark mass expansion of a heavy-light meson mass. The determined parameters are used to establish the charm quark masses corresponding to the employed lattice sets.

    ↳ hep-lathep-phPRD(2024)·3 citations
24. 24*

    Unlocking New Physics with Joint Power Spectrum and Voxel Intensity Distribution Forecasts in Line-Intensity Mapping

    Vivian I. Sabla🇺🇸 · José Luis Bernal🇪🇸 · Gabriela Sato-Polito🇺🇸 · Marc Kamionkowski🇺🇸

    The power spectrum and voxel intensity distribution (VID) are two summary statistics that can be applied to condense the information encoded in line-intensity maps. The information contained in both summary statistics is highly complementary, and their combination allows for a major increase in precision of parameter estimation from line-intensity mapping (LIM) surveys. Until recently, combination of these statistics required simulation-based estimations of their covariance. In this work we leverage an analytical model of covariance between these observables to run a joint Fisher forecast focusing on the CO(1-0) rotational line targeted by the COMAP survey and a wider, shallower hypothetical iteration. We consider a generalized phenomenological non-CDM model, models with axion dark matter, and local primordial non-Gaussianity, to highlight where a combined analysis of the power spectrum and VID can be most useful. Our results demonstrate improvements in sensitivity to beyond-$\Lambda$CDM physics over analyses using either the power spectrum or VID on their own, by factors ranging from 2 to 50, showcasing the potential of joint analyses in unlocking new insights into fundamental physics with LIM surveys.

    ↳ astro-ph.COhep-phPRD(2024)·4 citations
25. 25*

    Constraints on Symmetry Preserving Gapped Phases from Coupling Constant Anomalies

    T. Daniel Brennan🇺🇸

    In this note, we will characterize constraints on the possible IR phases of a given QFT by anomalies in the space of coupling constants. We will give conditions under which a coupling constant anomaly cannot be matched by a continuous family of symmetry preserving gapped phases, in which case the theory is either gapless, or exhibits spontaneous symmetry breaking or a phase transition. We additionally demonstrate examples of theories with coupling constant anomalies which can be matched by a family of symmetry preserving gapped phases without a phase transition and comment on the interpretation of our results for the spontaneous breaking of "$(-1)$-form global symmetries."

    ↳ hep-thcond-mat.str-elhep-phPRD(2024)·12 citations
26. 26*

    Future 21cm constraints on dark matter energy injection: Application to ALPs

    Laura Lopez-Honorez🇧🇪

    The redshifted 21cm signal from the Cosmic Dawn is expected to provide unprecedented insights into early Universe astrophysics and cosmology. Here, we briefly summarize how decaying dark matter can heat the intergalactic medium before the first galaxies, leaving a distinctive imprint on the 21cm power spectrum. We discuss the first Fisher matrix forecasts on the sensitivity of the Hydrogen Epoch of Reionization Array telescope (HERA) and argue that HERA can improve by up to three orders of magnitude previous cosmology constraints. In these proceedings, we project these future bounds in the plane of the Axion like particles (ALP) coupling to photons as a function of the ALP mass. We focus on the ALP mass range between $\sim$ 10 keV and 1 MeV where the 21cm signal power spectrum probes are expected to improve on any other current dark matter searches. This illustrates how 21cm cosmology can be expected to help in probing uncharted regions of the dark matter parameter space beyond the reach of existing astro-particle and cosmology experiments.

    ↳ astro-ph.COhep-phPoS(2024)·2 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.