Thu·May 11, 2023Thursday·May 11, 2023

1. 01*

   Planar degeneracy of the three-gluon vertex

   A. C. Aguilar🇧🇷 · M. N. Ferreira🇪🇸 · J. Papavassiliou🇪🇸 · L. R. Santos🇧🇷

   We present a detailed exploration of certain outstanding features of the transversely-projected three-gluon vertex, using the corresponding Schwinger-Dyson equation in conjunction with key results obtained from quenched lattice simulations. The main goal of this study is the scrutiny of the approximate property denominated ``planar degeneracy'', unveiled when the Bose symmetry of the vertex is properly exploited. The planar degeneracy leads to a particularly simple parametrization of the vertex, reducing its kinematic dependence to essentially a single variable. Our analysis, carried out in the absence of dynamical quarks, reveals that the planar degeneracy is particularly accurate for the description of the form factor associated with the classical tensor, for a wide array of arbitrary kinematic configurations. Instead, the remaining three form factors display considerable violations of this property. In addition, and in close connection with the previous point, we demonstrate the numerical dominance of the classical form factor over all others, except in the vicinity of the soft-gluon kinematics. The final upshot of these considerations is the emergence of a very compact description for the three-gluon vertex in general kinematics, which may simplify significantly nonperturbative applications involving this vertex.

   hep-phhep-latnucl-thEPJC(2023)·21 citations
2. 02*

   Probing some photon portals to new physics at intensity frontier experiments

   Krzysztof Jodłowski🇰🇷

   A number of extensions of the Standard Model predict the existence of new light, weakly-coupled particles that couple to the visible sector through higher-dimensional operators containing one or two photons, suppressed by a high new physics scale, and thus have long lifetimes. In this work, we study the prospects for detecting three $\sim$sub-GeV such long-lived particles (LLP) at intensity frontier experiments: a massive spin-2 mediator ($G$), a dark axion portal, and a light neutralino coupled to ALPino or gravitino. We consider the production and visible decays of these particles in several current and proposed beam dump experiments (CHARM, NuCal, SeaQuest, NA62, SHiP) as well as in the LHC detectors (FASER, FASER$\nu$, FLArE, MATHUSLA). In addition to the usual displaced vertex signature, we also examine the impact of electron scattering signature and the Primakoff-like process which leads to conversion of $G$ into a photon or to the secondary LLP production via upscattering of the lighter dark sector state on dense material put in front of the detector. In all cases, we find the SHiP experiment could provide the strongest constraints for the displaced vertex search, while FASER2/FPF could provide complementary coverage of the $\gamma c\tau \sim 1$ m decay length region of the parameter space.

   hep-phPRD(2023)·30 citations
3. 03*

   Discovering a light charged Higgs boson via $W^{\pm \ast }$ + 4$b$ final states at the LHC

   Z. Li🇨🇳 · A. Arhrib🇲🇦 · R. Benbrik🇲🇦 · M. Krab🇲🇦 · B. Manaut🇲🇦 · S. Moretti🇬🇧 · Y. Wang · Q.S. Yan🇨🇳

   Most of the current experimental searches for charged Higgs bosons at the Large Hadron Collider (LHC) concentrate upon the $tb$ and $\tau \nu$ decay channels. In the present study, we analyze instead the feasibility of the bosonic decay channel $W^{\pm \ast }h$, with the charged gauge boson being off-shell and $h$ being a neutral light Higgs boson, which decays predominantly into $b\bar{b}$. We perform a Monte Carlo (MC) analysis for the associate production of a charged Higgs with such a light neutral one, $pp\to H^{\pm }h$, at the LHC followed by the aforementioned charged Higgs boson decay, which leads to a $W^{\pm \ast }+4b$ final state. The analysis is performed within the 2-Higgs Doublet Model (2HDM) with Yukawa texture of Type-I. We take into account all available experimental constraints from LEP, Tevatron and the LHC as well as the theoretical requirements of self-consistency of this scenario. In order to study the full process $pp\to H^{\pm }h\to W^{\pm \ast }hh\to {\ell }^{\pm }\nu +4b$ ($\ell =e,\mu$), we provide several Benchmark Points (BPs) amenable to further analysis, with $M_{H^{\pm }}+M_b<M_t$, for which we prove that there is a strong possibility that this spectacular signal could be found at the LHC with center of mass energy 14 TeV and luminosity 300 ${\mathrm{fb}}^{-1}$.

   hep-ph12 citations
4. 04*

   More accurate $\sigma (\mathcal{G}\mathcal{G}\to h)$, $\Gamma (h\to \mathcal{G}\mathcal{G},\mathcal{AA},\bar{\Psi }\Psi )$ and Higgs width results via the geoSMEFT

   Adam Martin🇺🇸 · Michael Trott🇺🇸

   We develop Standard Model Effective Field Theory (SMEFT) predictions of $\sigma (\mathcal{G}\mathcal{G}\to h)$, $\Gamma (h\to \mathcal{G}\mathcal{G})$, $\Gamma (h\to \mathcal{AA})$ to incorporate full two loop Standard Model results at the amplitude level, in conjunction with dimension eight SMEFT corrections. We simultaneously report consistent $\Gamma (h\to \bar{\Psi }\Psi )$ results including leading QCD corrections and dimension eight SMEFT corrections. This extends the predictions of the former processes $\Gamma ,\sigma$ to a full set of corrections at $\mathcal{O}({\bar{v}}_T^2/{\Lambda }^2(16{\pi }^2{)}^2)$ and $\mathcal{O}({\bar{v}}_T^4/{\Lambda }^4)$, where ${\bar{v}}_T$ is the electroweak scale vacuum expectation value and $\Lambda$ is the cut off scale of the SMEFT. Throughout, cross consistency between the operator and loop expansions is maintained by the use of the geometric SMEFT formalism. For $\Gamma (h\to \bar{\Psi }\Psi )$, we include results at $\mathcal{O}({\bar{v}}_T^2/{\Lambda }^2(16{\pi }^2))$ in the limit where subleading $m_{\Psi }\to 0$ corrections are neglected. We clarify how gauge invariant SMEFT renormalization counterterms combine with the Standard Model counter terms in higher order SMEFT calculations when the Background Field Method is used. We also update the prediction of the total Higgs width in the SMEFT to consistently include some of these higher order perturbative effects.

   hep-phJHEP(2024)·23 citations
5. 05*

   Neutrino oscillations induced by chiral torsion

   Riya Barick🇮🇳 · Indrajit Ghose🇮🇳 · Amitabha Lahiri🇮🇳

   Neutrino mixing is caused by the fact that neutrino flavors are not eigenstates of the free Hamiltonian. This causes oscillations among different neutrino flavors. When neutrinos pass through a medium, weak interactions produce different effective masses for neutrinos of different flavors, leading to a modification of the mixing parameters. In curved spacetime there is an additional contribution to neutrino Hamiltonian from a torsion-induced four-fermion interaction, which also causes neutrino mixing while propagating through fermionic matter. We provide an outline of the calculation of this effect on neutrino oscillation.

   hep-phLHEP(2023)·7 citations
6. 06*

   Effect of spatially oscillating field on Schwinger pair production

   Orkash Amat🇨🇳 · Li-Na Hu🇨🇳 · Mamat Ali Bake🇨🇳 · Melike Mohamedsedik🇨🇳 · B. S. Xie🇨🇳

   Effect of spatially oscillating fields on the electron-positron pair production is studied numerically and analytically when the work done by the electric field over its spatial extent is smaller than twice the electron mass. Under large spatial scale, we further explain the characteristics of the position and momentum distribution via tunneling time, tunneling distance and energy gap between the positive and negative energy bands in the Dirac vacuum. Our results show that the maximum reduced particle number is about five times by comparing to maximum number for non-oscillating field. Moreover, the pair production results via Dirac-Heisenberg-Wigner formalism can be also calculated by using local density approximation and analytical approximation method when spatial oscillating cycle number is large. Moreover, in case of large spatial scale field, the position distribution of created particles could be interpreted by the tunneling time.

   hep-phquant-phPRD(2023)·7 citations
7. 07*

   Kaon Decays beyond the Standard Model

   Stefan Schacht🇬🇧

   We review a new method in order to determine the parameter $\bar{\eta }$ of the Cabibbo-Kobayashi-Maskawa matrix from $K\to {\mu }^{+}{\mu }^{-}$ decays, using interference effects in the time-dependent decay rate. Furthermore, we discuss a new precision relation for the phase-shift of the time-dependent oscillation. The new methodology enables the discovery potential of future time-dependent measurements of $K\to {\mu }^{+}{\mu }^{-}$ decays for physics beyond the Standard Model.

   hep-phhep-ex1 citation
8. 08*

   Dispersive Analysis of $B\to K^{(\ast )}$ and $B_s\to \varphi$ Form Factors

   Nico Gubernari🇩🇪 · Méril Reboud🇬🇧 · Danny van Dyk🇬🇧 · Javier Virto🇪🇸

   We perform the first simultaneous dispersive analysis of the $B\to K$, $B\to K^{\ast }$, and $B_s\to \varphi$ form factors. By means of an improved parametrization, we take into account the form factors' below-threshold branch cuts arising from on-shell ${\bar{B}}_s{\pi }^0$ and ${\bar{B}}_s{\pi }^0{\pi }^0$ states, which so far have been ignored in the literature. In this way, we eliminate a source of hard-to-quantify systematic uncertainties. We provide machine-readable files to obtain the full set of the $\bar{B}\to {\bar{K}}^{(\ast )}$ and ${\bar{B}}_s\to \varphi$ form factors in and beyond the entire semileptonic phase space.

   hep-phhep-exhep-latJHEP(2023)·100 citations
9. 09*

   Twin Sterile Neutrino Dark Matter

   Ian Holst🇺🇸 · Dan Hooper🇺🇸 · Gordan Krnjaic🇺🇸 · Deheng Song🇯🇵

   We propose that the dark matter of our Universe could be sterile neutrinos which reside within the twin sector of a mirror twin Higgs model. In our scenario, these particles are produced through a version of the Dodelson-Widrow mechanism that takes place entirely within the twin sector, yielding a dark matter candidate that is consistent with X-ray and gamma-ray line constraints. Furthermore, this scenario can naturally avoid the cosmological problems that are typically encountered in mirror twin Higgs models. In particular, if the sterile neutrinos in the Standard Model sector decay out of equilibrium, they can heat the Standard Model bath and reduce the contributions of the twin particles to $N_{\mathrm{eff}}$. Such decays also reduce the effective temperature of the dark matter, thereby relaxing constraints from large-scale structure. The sterile neutrinos included in this model are compatible with the seesaw mechanism for generating Standard Model neutrino masses.

   hep-phastro-ph.COPRD(2024)·11 citations
10. 10*

    Constraining the chirally motivated $\pi \Sigma$-$\bar{K}N$ models with the $\pi \Sigma$ photoproduction mass spectra

    A. Cieply🇨🇿 · P. C. Bruns🇨🇿

    The paper presents a first time attempt on a combined fit of the $K^{-}p$ low-energy data and the $\pi \Sigma$ photoproduction mass spectra, performed without fixing the meson-baryon rescattering amplitudes to a specific $\pi \Sigma -\bar{K}N$ coupled channels model obtained from fitting exclusively the $K^{-}p$ data. The formalism adopted to describe the photoproduction process is based on chiral perturbation theory and employs a limited number of free parameters. The achieved description of the photoproduction mass distributions is not quite satisfactory, leaving a room for improving the photo-kernel construction, but still provides additional constraints on the positions of the $\Lambda (1405)$ poles. In particular, the presented models tend to limit the mass of the lower pole and yield a larger width of the $\bar{K}N$ related pole at a higher mass.

    ↳ nucl-thhep-phNPA(2024)·4 citations
11. 11*

    Precise determination of decay rates for ${\eta }_c\to \gamma \gamma$, $J/\psi \to \gamma {\eta }_c$ and $J/\psi \to {\eta }_c{e}^{+}{e}^{-}$ from lattice QCD

    Brian Colquhoun🇬🇧 · Laurence J. Cooper🇬🇧 · Christine T. H. Davies🇬🇧 · G. Peter Lepage🇺🇸

    We calculate the decay rates for ${\eta }_c\to \gamma \gamma$, $J/\psi \to \gamma {\eta }_c$ and $J/\psi \to {\eta }_c{e}^{+}{e}^{-}$ in lattice QCD with $u$, $d$, $s$ and $c$ quarks in the sea for the first time. We improve significantly on previous theory calculations to achieve accuracies of 1--2\%, giving lattice QCD results that are now more accurate than the experimental values. In particular our results transform the theoretical picture for ${\eta }_c\to \gamma \gamma$ decays. We use gluon field configurations generated by the MILC collaboration that include $n_f=2+1+1$ flavours of Highly Improved Staggered (HISQ) sea quarks at four lattice spacing values from 0.15 fm to 0.06 fm and with sea u/d masses down to their physical value. We also implement the valence $c$ quarks using the HISQ action. We find $\Gamma ({\eta }_c\to \gamma \gamma )=6.788(45{)}_{\text{fit}}(41{)}_{\text{syst}}\mathrm{keV}$, in good agreement with experimental results using $\gamma \gamma \to {\eta }_c\to K\overline{K}\pi$ but in 4$\sigma$ tension with the Particle Data Group global fit result; we suggest this fit is revisited. We also calculate $\Gamma (J/\psi \to \gamma {\eta }_c)=2.219(17{)}_{\text{fit}}(18{)}_{\text{syst}}(24{)}_{\text{expt}}(4{)}_{\text{QED}}\mathrm{keV}$, in good agreement with results from CLEO, and predict the Dalitz decay rate $\Gamma (J/\psi \to {\eta }_c{e}^{+}{e}^{-})=0.01349(21{)}_{\text{latt}}(13{)}_{\text{QED}}\mathrm{keV}$. We use our results to calibrate other theoretical approaches and to test simple relationships between the form factors and $J/\psi$ decay constant expected in the nonrelativistic limit.

    ↳ hep-lathep-phPRD(2023)·37 citations
12. 12*

    Search for EFT in associated top production

    Sergio Sanchez Cruz (on behalf of the CMS Collaboration)🇨🇭

    A search for new physics in top quark production with additional final-state leptons is performed with 138 ${\mathrm{fb}}^{-1}$ of proton-proton collision data at $\sqrt{s}$ = 13 TeV. We use the framework of effective field theory to parametrize potential new physics effects in terms of 26 dimension-six EFT operators. The data are divided into several categories based on lepton multiplicity, total lepton charge, jet multiplicities, and b-tagged jet multiplicities. Kinematic variables are used to extract limits simultaneously on the associated set of Wilson coefficients.

    ↳ hep-exhep-ph1 citation
13. 13*

    Constraint of pionless EFT using two-nucleon spectra from lattice QCD

    William Detmold🇺🇸 · Fernando Romero-López🇺🇸 · Phiala E. Shanahan🇺🇸

    Finite-volume pionless effective field theory (FVEFT${}_{\pi /}$) at next-to-leading order (NLO) is used to analyze the two-nucleon lattice QCD spectrum of Ref.~\cite{Amarasinghe:2021lqa}, performed at quark masses corresponding to a pion mass of approximately $800$ MeV. Specifically, the effective theory is formulated in finite volume, and variational sets of wave functions are optimized using differential programming. Using these wave functions projected to the appropriate finite-volume symmetry group, variational bounds from FVEFT${}_{\pi /}$ are obtained for the ground state, as well as excited states. By comparison with the lattice QCD GEVP spectrum, different low energy constants (LECs) are constrained. Relativistic corrections are incorporated, allowing for the extractions of NLO LECs, as well as the leading $s$-$d$-wave mixing term in the deuteron channel.

    ↳ nucl-thhep-lathep-phPRD(2023)·6 citations
14. 14*

    Testing Gravity in the Laboratory

    Quentin G. Bailey🇺🇸

    In this chapter, we discuss recent work on precision Earth laboratory tests of different aspects of gravity. In particular the discussion is focused on those tests that can be used to probe hypothesis for physics beyond Newtonian gravity and General Relativity. The latter includes tests of foundations like local Lorentz invariance, Weak-Equivalence Principle tests, short-range gravity tests, gravimeter-type tests, and other frontier possibilities like the free-fall of anti-matter and searches for non-Riemann gravity effects. The focus is on key results in theory, phenomenology, and experiment in the last few decades. We describe the motivations for continued interest in precision tests of gravity in the laboratory, including the possibility to search for physics beyond General Relativity. Test frameworks for describing deviations from General Relativity are emphasized, including ones based on effective field theory, allowing for generic violations of Lorentz symmetry, CPT symmetry, and diffeomorphism symmetry.

    ↳ gr-qchep-ph5 citations
15. 15*

    Magnetic Catalysis in Holographic Model with Two Types of Anisotropy for Heavy Quarks

    Irina Ya. Aref'eva🇷🇺 · Ali Hajilou🇷🇺 · Kristina Rannu🇷🇺 · Pavel Slepov🇷🇺

    In our previous paper [arXiv:2011.07023] we have constructed a twice anisotropic five-dimensional holographic model supported by Einstein-dilaton-three-Maxwell action that reproduced some essential features of the "heavy quarks" model. However, that model did not describe the magnetic catalysis (MC) phenomena expected from lattice results for the QGP made up from heavy quarks. In this paper we fill this gap and construct the model that improves the previous one. It keeps typical properties of the heavy quarks phase diagram, and meanwhile possesses the MC. The deformation of previous model includes the modification of the "heavy quarks" warp factor and the coupling function for the Maxwell field providing the non-trivial chemical potential.

    ↳ hep-thhep-phEPJC(2023)·27 citations
16. 16*

    A Leptonic Model for Neutrino Emission From Active Galactic Nuclei

    Dan Hooper🇺🇸 · Kathryn Plant🇺🇸

    It is often stated that the observation of high-energy neutrinos from an astrophysical source would constitute a smoking gun for the acceleration of hadronic cosmic rays. Here, we point out that there exists a purely leptonic mechanism to produce TeV-scale neutrinos in astrophysical environments. In particular, very high-energy synchrotron photons can scatter with X-rays, exceeding the threshold for muon-antimuon pair production. When these muons decay, they produce neutrinos without any cosmic-ray protons or nuclei being involved. In order for this mechanism to be efficient, the source in question must produce very high-energy photons which interact in an environment that is dominated by keV-scale radiation. As an example, we consider the active galaxy NGC 1068, which IceCube has recently detected as a source of TeV-scale neutrinos. We find that the neutrino emission observed from this source could potentially be generated through muon pair production for reasonable choices of physical parameters.

    ↳ astro-ph.HEastro-ph.COhep-phPRL(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.