Thu·Nov 3, 2022Thursday·November 3, 2022

1. 01*

   Universal location of Yang-Lee edge singularity in classic O(N) universality classes

   Gregory Johnson🇺🇸 · Fabian Rennecke🇩🇪 · Vladimir V. Skokov🇺🇸

   Employing the functional renormalization group approach at next-to-leading order of the derivative expansion, we refine our earlier findings for the location of the Yang-Lee edge singularity in classic O(N) universality classes. For the universality classes of interest to QCD, in three dimensions, we found $|z_c|/R_{\chi }^{1/\gamma }=1.612(9),1.597(3)$ for $N=2$, $4$ correspondingly. We also established $|z_c|=2.04(8),1.69(3)$ for $N=2$, $4$ albeit with greater systematic error.

   hep-phcond-mat.stat-mechPRD(2023)·30 citations
2. 02*

   Determining the $CP$ Property of $ht\bar{t}$ Coupling via a Novel Jet Substructure Observable

   Zhite Yu🇺🇸 · Kirtimaan A. Mohan🇺🇸 · C.-P. Yuan🇺🇸

   Determining the $CP$ property of the Higgs boson is important for a precision test of the Standard Model as well as for the search for new physics. We propose a novel jet substructure observable based on the azimuthal anisotropy in a linearly polarized gluon jet that is produced in association with a Higgs boson at hadron colliders, and demonstrate that it provides a new $CP$-odd observable for determining the $CP$ property of the Higgs-top interaction. We introduce a factorization formalism to define a polarized gluon jet function with the insertion of an infrared-safe azimuthal observable to capture the linear polarization.

   hep-phhep-exhep-latnucl-thPLB(2024)·9 citations
3. 03*

   Lorentz- and CPT-violating neutrinos from string/D-brane model

   Chengyi Li🇨🇳 · Bo-Qiang Ma🇨🇳

   We show that the space-time foam model from string/D-brane theory predicts a scenario in which neutrinos can possess linearly energy dependent speed variation, together with an asymmetry between neutrinos and antineutrinos, indicating the possibility of Lorentz and CPT symmetry violation for neutrinos. Such scenario is supported by a phenomenological conjecture from the possible associations of IceCube ultrahigh-energy neutrino events with the gamma-ray bursts. It is also consistent with the constraints set by the energy-losing decay channels~(e.g., $e^{+}{e}^{-}$ pair emission, or neutrino splitting) upon superluminal neutrino velocities. We argue that the plausible violations of energy-momentum conservation during decay may be responsible for the stable propagation of these neutrinos, and hence for the evasion of relevant constraints.

   hep-phastro-ph.HEgr-qcPLB(2022)·10 citations
4. 04*

   Sifting composite from elementary models at FCCee and CePC

   G. Cacciapaglia🇫🇷 · A. Deandrea🇫🇷 · A.M. Iyer🇮🇳 · A. Pinto🇫🇷

   New Physics models with either an elementary or composite origin are often associated with a similar imprint in a direct search at colliders, case in point being the production of a light pseudoscalar in association with a monochromatic photon from the decay of a Z boson at future $e+e-$ colliders. We exploit the correlation between the discovery of a signal in the Z decays and electroweak precision measurements as a tool to distinguish a composite model from an elementary scalar one. Our results offer an appealing and rich physics case for future colliders and demonstrate how a lepton collider at the Z mass can be a discovery machine for new physics in the Higgs sector.

   hep-phSciPost Phys.(2023)·4 citations
5. 05*

   High-precision muon decay predictions for ALP searches

   P. Banerjee🇨🇳 · A. M. Coutinho🇨🇭 · T. Engel🇨🇭 · A. Gurgone🇮🇹 · A. Signer🇨🇭 · Y. Ulrich🇬🇧

   We present an improved theoretical prediction of the positron energy spectrum for the polarised Michel decay ${\mu }^{+}\to e^{+}{\nu }_e{\bar{\nu }}_{\mu }$. In addition to the full next-to-next-to-leading order correction of order ${\alpha }^2$ in the electromagnetic coupling, we include logarithmically enhanced terms at even higher orders. Logarithms due to collinear emission are included at next-to-leading accuracy up to order ${\alpha }^4$. At the endpoint of the Michel spectrum, soft photon emission results in large logarithms that are resummed up to next-to-next-to-leading logarithmic accuracy. We apply our results in the context of the MEG II and Mu3e experiments to estimate the impact of the theory error on the branching ratio sensitivity for the lepton-flavour-violating decay ${\mu }^{+}\to e^{+}X$ of a muon into an axion-like particle $X$.

   hep-phhep-exSciPost Phys.(2023)·21 citations
6. 06*

   Simultaneous CTEQ-TEA extraction of PDFs and SMEFT parameters from jet and $t\bar{t}$ data

   Jun Gao🇨🇳 · MeiSen Gao🇨🇳 · T. J. Hobbs🇺🇸 · DianYu Liu🇨🇳 · XiaoMin Shen🇨🇳

   Recasting phenomenological Lagrangians in terms of SM effective field theory (SMEFT) provides a valuable means of connecting potential BSM physics at momenta well above the electroweak scale to experimental signatures at lower energies. In this work we jointly fit the Wilson coefficients of SMEFT operators as well as the PDFs in an extension of the CT18 global analysis framework, obtaining self-consistent constraints to possible BSM physics effects. Global fits are boosted with machine-learning techniques in the form of neural networks to ensure efficient scans of the full PDF+SMEFT parameter space. We focus on several operators relevant for top-quark pair and jet production at hadron colliders and obtain constraints on the Wilson coefficients with Lagrange Multiplier scans. We find mild correlations between the extracted Wilson coefficients, PDFs, and other QCD parameters, and see indications that these correlations may become more prominent in future analyses based on data of higher precision. This work serves as a new platform for joint analyses of SM and BSM physics based on the CTEQ-TEA framework.

   hep-phhep-exJHEP(2023)·41 citations
7. 07*

   The $T_{c\bar{s}}(2900)$ as a threshold effect from the interaction of the $D^{\ast }{K}^{\ast }$, $D_s^{\ast }\rho$ channels

   R. Molina🇪🇸 · E. Oset🇪🇸

   We look at the mass distribution of the $D_s^{+}{\pi }^{-}$ in the $B^0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay, where a peak has been observed in the region of the $D_s^{\ast }\rho$, $D^{\ast }{K}^{\ast }$ thresholds. By creating these two channels together with a ${\bar{D}}^0$ in $B^0$ decay and letting them interact as coupled channels, we obtain a structure around their thresholds, short of producing a bound state, which leads to a peak in the $D_s^{+}{\pi }^{-}$ mass distribution in the $B^0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay. We conclude that the interaction between the $D^{\ast }{K}^{\ast }$ and $D_s^{\ast }\rho$ is essential to produce the cusp structure that we associate to the recently seen $T_{c\bar{s}}(2900)$, and that its experimental width is mainly due to the decay width of the $\rho$ meson. The peak obtained together with a smooth background reproduces fairly well the experimental mass distribution observed in the $B_0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay.

   hep-phhep-latPRD(2023)·42 citations
8. 08*

   The $\mu$-$\tau$ mixed symmetry and neutrino mass matrix

   Manash Dey🇮🇳 · Pralay Chakraborty🇮🇳 · Subhankar Roy🇮🇳

   We propose an elegant neutrino mass matrix texture entitled $\mu$-$\tau$ mixed symmetry highlighting two simple correlations among its elements and a detailed analysis is carried out to see its phenomenological implications. The proposed texture is motivated in the framework of Seesaw mechanism in association with $A_4$ symmetry

   hep-phPLB(2023)·32 citations
9. 09*

   Amplitude's positivity vs. subluminality: Causality and Unitarity Constraints on dimension 6 & 8 Gluonic operators in the SMEFT

   Diptimoy Ghosh🇮🇳 · Rajat Sharma🇮🇳 · Farman Ullah🇮🇳

   We derive the causality and unitarity constraints on dimension 6 and dimension 8 Gluon field strength operators in the Standard Model Effective Field Theory (SMEFT). In the first part of the paper, we use the 'amplitude analysis' i.e. dispersion relation for $2\to 2$ scattering in the forward limit, to put bounds on the Wilson coefficients. We show that the dimension 6 operators can exist only in the presence of certain dimension 8 operators. It is interesting that the square of the dimension 6 Wilson coefficients can be constrained in this case even at the tree level. In the second part of this work, we successfully rederive all these bounds using the classical causality argument that demands that the speed of fluctuations about any non-trivial background should not exceed the speed of light. We also point out some subtleties in the superluminality analysis regarding whether the low-frequency phase velocity can always be used as the relevant quantity for Causality violation: as an example, we show that, due to these subtleties, if a small pion mass is added in the chiral Lagrangian, it is unclear if any strict positivity bound can be derived on the dimension 8 Wilson coefficient. Finally, we mention an interesting non-relativistic example where the subluminality requirement produces a stronger bound than the 'amplitude analysis'.

   hep-phhep-thJHEP(2023)·30 citations
10. 10*

    Dipole operators in Fierz identities

    Jason Aebischer🇨🇭 · Marko Pesut🇨🇭 · Zachary Polonsky🇨🇭

    We study the contribution from dipole operators to one-loop Fierz identities and provide the resulting QCD and QED shifts to the tree-level relations for all four-fermion operators. The results simplify one-loop basis changes as well as matching computations and allow one to consistently eliminate operators from an operator basis which give rise to complications, e.g. traces involving ${\gamma }_5$.

    hep-phPLB(2023)·21 citations
11. 11*

    The persistent nonperturbative charm enigma

    Marco Guzzi🇺🇸 · T. J. Hobbs🇺🇸 · Keping Xie🇺🇸 · Joey Huston🇺🇸 · Pavel Nadolsky🇺🇸 · C.-P. Yuan🇺🇸

    The question of the existence and possible magnitude of nonperturbative (often called "intrinsic") charm in the proton has long confounded attempts to cleanly isolate such a contribution in global analyses of high-energy experiments. In this letter, we show that the available (non)perturbative QCD theory and hadronic data have still not developed to a sufficient level to clearly resolve this problem. We highlight a number of challenging aspects that must be confronted in extracting nonperturbative charm in PDF fits, and in so doing, present an updated next-to-next-to-leading order CT analysis of fitted charm, CT18 FC, which we also compare to recent studies. We outline the theory developments and future data needed to make progress on this subject.

    hep-phnucl-thPLB(2023)·68 citations
12. 12*

    On representation matrices of boundary conditions in $SU(n)$ gauge theories compactified on two-dimensional orbifolds

    Yoshiharu Kawamura🇯🇵 · Eiji Kodaira🇯🇵 · Kentaro Kojima🇯🇵 · Toshifumi Yamashita🇯🇵

    We study the existence of diagonal representatives in each equivalence class of representation matrices of boundary conditions in $SU(n)$ or $U(n)$ gauge theories compactified on the orbifolds $T^2/{\mathbb{Z}}_N$ ($N=2,3,4,6$). We suppose that the theory has a global $G^{\prime }=U(n)$ symmetry. Using constraints, unitary transformations and gauge transformations, we examine whether the representation matrices can simultaneously become diagonal or not. We show that at least one diagonal representative necessarily exists in each equivalence class on $T^2/{\mathbb{Z}}_2$ and $T^2/{\mathbb{Z}}_3$, but the representation matrices on $T^2/{\mathbb{Z}}_4$ and $T^2/{\mathbb{Z}}_6$ can contain not only diagonal matrices but also non-diagonal $2\times 2$ ones and non-diagonal $3\times 3$ and $2\times 2$ ones, respectively, as members of block-diagonal submatrices. These non-diagonal matrices have discrete parameters, which means that the rank-reducing symmetry breaking can be caused by the discrete Wilson line phases.

    ↳ hep-thhep-phJHEP(2023)·11 citations
13. 13*

    Constraints on the Higgs boson self-coupling from single- and double-Higgs production with the ATLAS detector using $pp$ collisions at $\sqrt{s}=13$ TeV

    ATLAS Collaboration

    Constraints on the Higgs boson self-coupling are set by combining double-Higgs boson analyses in the $b\bar{b}b\bar{b}$, $b\bar{b}{\tau }^{+}{\tau }^{-}$ and $b\bar{b}\gamma \gamma$ decay channels with single-Higgs boson analyses targeting the $\gamma \gamma$, $Z{Z}^{\ast }$, $W{W}^{\ast }$, ${\tau }^{+}{\tau }^{-}$ and $b\bar{b}$ decay channels. The data used in these analyses were recorded by the ATLAS detector at the LHC in proton$-$proton collisions at $\sqrt{s}=13$ TeV and correspond to an integrated luminosity of 126$-$139 fb${}^{-1}$. The combination of the double-Higgs analyses sets an upper limit of ${\mu }_{HH}<2.4$ at 95% confidence level on the double-Higgs production cross-section normalised to its Standard Model prediction. Combining the single-Higgs and double-Higgs analyses, with the assumption that new physics affects only the Higgs boson self-coupling (${\lambda }_{HHH}$), values outside the interval $-0.4<{\kappa }_{\lambda }=({\lambda }_{HHH}/{\lambda }_{HHH}^{\text{SM}})<6.3$ are excluded at 95% confidence level. The combined single-Higgs and double-Higgs analyses provide results with fewer assumptions, by adding in the fit more coupling modifiers introduced to account for the Higgs boson interactions with the other Standard Model particles. In this relaxed scenario, the constraint becomes $-1.4<{\kappa }_{\lambda }<6.1$ at 95% CL.

    ↳ hep-exhep-phPLB(2023)·216 citations
14. 14*

    FeynGKZ: a Mathematica package for solving Feynman integrals using GKZ hypergeometric systems

    B. Ananthanarayan🇮🇳 · Sumit Banik🇮🇳 · Souvik Bera🇮🇳 · Sudeepan Datta🇮🇳

    In the Lee-Pomeransky representation, Feynman integrals can be identified as a subset of Euler-Mellin integrals, which are known to satisfy Gel'fand-Kapranov-Zelevinsky (GKZ) system of partial differential equations. Here we present an automated package to derive the associated GKZ system for a given Feynman diagram and solve it in terms of hypergeometric functions using two equivalent algorithms, namely the triangulation method and the Gröbner deformation method. We present our code in the form of a Mathematica package FeynGKZ.wl which requires the softwares polymake, Macaulay2 and TOPCOM, and the packages AMBRE and Olsson.wl as dependencies. As applications of the package, we find series solutions to the GKZ systems of several one-loop and two-loop Feynman integrals. These are included in the file Examples.nb that can be downloaded along with the package from https://github.com/anant-group/FeynGKZ.

    ↳ hep-thhep-phmath-phmath.MPComput.Phys.Commun.(2023)·49 citations
15. 15*

    Large-Scale $2+1$D $\mathrm{U}(1)$ Gauge Theory with Dynamical Matter in a Cold-Atom Quantum Simulator

    Jesse Osborne🇦🇺 · Ian P. McCulloch🇦🇺 · Bing Yang🇨🇳 · Philipp Hauke🇮🇹 · Jad C. Halimeh🇩🇪

    A major driver of quantum-simulator technology is the prospect of probing high-energy phenomena in synthetic quantum matter setups at a high level of control and tunability. Here, we propose an experimentally feasible realization of a large-scale $2+1$D $\mathrm{U}(1)$ gauge theory with dynamical matter and gauge fields in a cold-atom quantum simulator with spinless bosons. We present the full mapping of the corresponding Gauss's law onto the bosonic computational basis. We then show that the target gauge theory can be faithfully realized and stabilized by an emergent gauge protection term in a two-dimensional single-species Bose--Hubbard optical Lieb superlattice with two spatial periods along either direction, thereby requiring only moderate experimental resources already available in current cold-atom setups. Using infinite matrix product states, we calculate numerical benchmarks for adiabatic sweeps and global quench dynamics that further confirm the fidelity of the mapping. Our work brings quantum simulators of gauge theories a significant step forward in terms of investigating particle physics in higher spatial dimensions, and is readily implementable in existing cold-atom platforms.

    ↳ cond-mat.quant-gascond-mat.str-elhep-lathep-ph+1Commun.Phys.(2025)·47 citations
16. 16*

    The fate of discrete torsion on resolved heterotic Z2xZ2 orbifolds using (0,2) GLSMs

    A.E. Faraggi🇬🇧 · S. Groot Nibbelink · M. Hurtado-Heredia🇬🇧

    This paper aims to shed light on what becomes of discrete torsion within heterotic orbifolds when they are resolved to smooth geometries. Gauged Linear Sigma Models (GLSMs) possessing (0,2) worldsheet supersymmetry are employed as interpolations between them. This question is addressed for resolutions of the non-compact C3/Z2xZ2 and the compact T6/Z2xZ2 orbifolds to keep track of local and global aspects. The GLSMs associated with the non-compact orbifold with or without torsion are to a large extent equivalent: only when expressed in the same superfield basis, a field redefinition anomaly arises among them, which in the orbifold limit reproduces the discrete torsion phases. Previously unknown, novel resolution GLSMs for T6/Z2xZ2 are constructed. The GLSM associated with the torsional compact orbifold suffers from mixed gauge anomalies, which need to be cancelled by appropriate logarithmic superfield dependent FI-terms on the worldsheet, signalling H-flux due to NS5-branes supported at the exceptional cycles.

    ↳ hep-thhep-phmath-phmath.AG+1NPB(2023)·8 citations
17. 17*

    Connecting small-scale to large-scale structures of fast neutrino-flavor conversion

    Hiroki Nagakura🇯🇵 · Masamichi Zaizen🇯🇵

    We present a systematic study of fast neutrino-flavor conversion (FFC) with both small-scale and large-scale numerical simulations in spherical symmetry. We find that FFCs can, in general, reach a quasi-steady state, and these features in the non-linear phase are not characterized by the growth rate of FFC instability but rather angular structures of electron neutrino lepton number (ELN) and heavy one (XLN). Our result suggests that neutrinos can almost reach a flavor equipartition even in cases with low growth rate of instability (e.g., shallow ELN crossing) and narrow angular regions (in momentum space) where flavor conversions occur vigorously. This exhibits that ELN and XLN angular distributions can not provide a sufficient information to determine total amount of flavor conversion in neutrinos and antineutrinos of all flavors. Based on the results of our numerical simulations, we provide a new approximate scheme of FFC that is designed so that one can easily incorporate effects of FFCs in existing classical neutrino transport codes for the study of core-collapse supernova (CCSN) and binary neutron star merger (BNSM). The scheme has an ability to capture key features of quasi-steady state of FFCs without solving quantum kinetic neutrino transport, which will serve to facilitate access to FFCs for CCSN and BNSM theorists.

    ↳ astro-ph.HEhep-exhep-phnucl-thPRD(2023)·38 citations
18. 18*

    The quantum character of the Scalar Field Dark Matter

    Tonatiuh Matos🇲🇽

    The Scalar Field Dark Matter (SFDM) model, also called Fuzzy, Wave, Bose-Einstein, Ultra-light Dark Matter, has received a lot of attention because it has been able to provide simpler and more natural explanations for various features of galaxies, such as the number of satellite galaxies and the cusp-core problem. We recently showed that this model is able to explain the vast polar orbits of satellite galaxies around their host, the so-called VPO, and to explain the X-ray and gamma-ray emissions in the vacuum regions of our galaxy, that is, the Fermi Bubbles. In all these phenomena the quantum character of SFDM has been crucial. In this work we study the quantum effects of SFDM at the cosmological level, to see these effects not only at the galactic scale, but also at the cosmological scale. Using a convenient ansatz, we were able to integrate the perturbed equations to show that the shape of the SFDM halos resembling atoms is a generic result. The main conclusion of this work is that quantum mechanics, the successful microworld theory, could also explain the dark side of the cosmos.

    ↳ astro-ph.COgr-qchep-phMNRAS(2022)·8 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.