HEP Phenomenology·hep-ph

Thu·Jun 24, 2021Thursday·June 24, 2021

23 papers—20 primary·3 cross-listed·reconstructed*

01*
Towards an independent determination of muon g-2 from muonium spectroscopy
Cédric Delaunay🇫🇷 · Ben Ohayon🇨🇭 · Yotam Soreq🇮🇱
We show that muonium spectroscopy in the coming years can reach a precision high enough to determine the anomalous magnetic moment of the muon below one part per million (ppm). Such an independent determination of muon g-2, which is not limited by hadronic uncertainties, would certainly shed light on the 2ppm difference currently observed between spin-precession measurements and (R-ratio based) Standard Model predictions. The magnetic dipole interaction between electrons and (anti)muons bound in muonium gives rise to a hyperfine splitting (HFS) of the ground state which is sensitive to the muon anomalous magnetic moment. A direct comparison of the muonium frequency measurements of the HFS at J-PARC and the 1S-2S transition at PSI with theory predictions will allow to extract muon g-2 with high precision. Improving the accuracy of QED calculations of these transitions by about one order of magnitude is also required. Moreover, the good agreement between theory and experiment for the electron g-2 indicates that new physics interactions are unlikely to affect muonium spectroscopy down to the envisaged precision.
hep-phhep-exphysics.atom-phquant-phPRL(2021)·21 citations
02*
Analytic two-loop master integrals for $t W$ production at hadron colliders: I
Long-Bin Chen🇨🇳 · Jian Wang🇨🇳
We present the analytic calculation of two-loop master integrals that are relevant for $t W$ production at hadron colliders. We focus on the integral families with only one massive propagator. After choosing a canonical basis, the differential equations for the master integrals can be transformed into the $d$ ln form. The boundaries are determined by simple direct integrations or regularity conditions at kinematic points without physical singularities. The analytical results in this work are expressed in terms of multiple polylogarithms, and have been checked with numerical computations.
hep-phCPC(2021)·14 citations
03*
Theoretical challenges for flavor physics
Yuval Grossman🇺🇸 · Zoltan Ligeti🇺🇸
We discuss some highlights of the FCC-ee flavor physics program. It will help to explore various aspects of flavor physics: to test precision calculations, to probe nonperturbative QCD methods, and to increase the sensitivity to physics beyond the standard model. In some areas, FCC-ee will do much better than current and near-future experiments. We briefly discuss several probes that can be relevant for maximizing the gain from the FCC-ee flavor program.
hep-phEur.Phys.J.Plus(2021)·9 citations
04*
Constraints on coloured scalars from global fits
Otto Eberhardt🇪🇸 · Víctor Miralles🇪🇸 · Antonio Pich🇪🇸
We consider a simple extension of the electroweak theory, incorporating one $S U (2)_{L}$ doublet of colour-octet scalars with Yukawa couplings satisfying the principle of minimal flavour violation. Using the HEPfit package, we perform a global fit to the available data, including all relevant theoretical constraints, and extract the current bounds on the model parameters. Coloured scalars with masses below 1.05 TeV are already excluded, provided they are not fermiophobic. The mass splittings among the different (charged and CP-even and CP-odd neutral) scalars are restricted to be smaller than 20 GeV. Moreover, for scalar masses smaller than 1.5 TeV, the Yukawa coupling of the coloured scalar multiplet to the top quark cannot exceed the one of the SM Higgs doublet by more than 80%. These conclusions are quite generic and apply in more general frameworks (without fine tunings). The theoretical requirements of perturbative unitarity and vacuum stability enforce relevant constraints on the quartic scalar potential parameters that are not yet experimentally tested.
hep-phJHEP(2021)·16 citations
05*
$P_{c} (4457) \to P_{c} (4312) π / γ$ in the molecular picture
Xi-Zhe Ling🇨🇳 · Jun-Xu Lu🇨🇳 · Ming-Zhu Liu🇨🇳 · Li-Sheng Geng🇨🇳
The three pentaquark states, $P_{c} (4312)$ , $P_{c} (4440)$ , and $P_{c} (4457)$ , discovered by the LHCb Collaboration in 2019, can be nicely arranged into a multiplet of $D ˉ^{(*)} Σ_{c}^{(*)}$ of seven molecules dictated by heavy quark spin symmetry. In this work we employ the effective Lagrangian approach to investigate the two decay modes of $P_{c} (4457)$ , $P_{c} (4457) \to P_{c} (4312) π$ and $P_{c} (4457) \to P_{c} (4312) γ$ , via the triangle mechanism, assuming that $P_{c} (4457)$ and $P_{c} (4312)$ are $D ˉ^{*} Σ_{c}$ and $D ˉ Σ_{c}$ bound states but the spin of $P_{c} (4457)$ can be either 1/2 or 3/2. Our results show that the spin of $P_{c} (4457)$ can not be discriminated through these two decay modes. The decay widths of $P_{c} (4457) \to P_{c} (4312) π$ and $P_{c} (4457) \to P_{c} (4312) γ$ are estimated to be of order of 100 keV and 1 keV, respectively. The ratio of the partial decay widths of $P_{c} (4457) \to P_{c} (4312) π$ to $P_{c} (4457) \to P_{c} (4312) γ$ is similar to the ratio of $D^{*} \to D π$ to $D^{*} \to D γ$ , which could be used to check the molecular nature of $P_{c} (4457)$ and $P_{c} (4312)$ if they can be observed in the future.
hep-phPRD(2021)·37 citations
06*
Dequantization of electric charge: Probing scenarios of cosmological multi-component dark matter
Duong Van Loi🇻🇳 · Nguyen Manh Duc🇻🇳 · Phung Van Dong
Since the electric charge in the standard model is theoretically not quantized, we may have a variant of it, called dark charge. Similar to the electric charge, the dark charge neither commutes nor closes algebraically with $S U (2)_{L}$ . The condition of algebraic closure leads to a novel gauge extension, $S U (2)_{L} \otimes U (1)_{Y} \otimes U (1)_{N}$ , where $Y$ and $N$ determine the electric and dark charges, respectively, apart from the color group. We argue that the existence of the dark charge, thus $N$ , leads to novel scenarios of multi-component dark matter, in general. The dark matter stability is determined by a residual (or dark charge) gauge symmetry isomorphic to an even $Z_{k}$ discrete group, where $k$ is specified dependent on the value of the neutrino dark charge. This residual symmetry divides the standard model particles into distinct classes, which possibly accommodate dark matter, but each dark matter candidate cannot decay due to the color and electric charge conservation. We analyze in detail three specific models according to $k = 2, 4, 6$ and determine the simplest dark matter candidates. For small $U (1)_{N}$ coupling, the two-component dark matter scenarios implied by the dark charge successfully explain the dark matter relic density and the recent XENON1T excess, as well as the beam dump, neutrino scattering, and astrophysical bounds. Otherwise, for large $U (1)_{N}$ coupling, we have multi-WIMPs coexisted beyond the weak scale.
hep-phhep-thNPB(2022)·5 citations
07*
Next generation proton PDFs with deuteron and nuclear uncertainties
Rosalyn L. Pearson🇬🇧 · Richard D. Ball🇬🇧 · Emanuele R. Nocera🇬🇧
As data become more precise, estimating theoretical uncertainties in global PDF determinations is likely to become increasingly necessary to obtain correspondingly precise PDFs. Here we present a next generation of global proton PDFs (NNPDF4.0) that include theoretical uncertainties due to the use of heavy nuclear and deuteron data in the fit. We estimate these uncertainties by comparing the values of the nuclear observables computed with the nuclear PDFs against those computed with proton PDFs. For heavy nuclear PDFs we use the nuclear nNNPDF2.0 set, while for deuteron PDFs we develop an iterative procedure to determine proton and deuteron PDFs simultaneously, each including the uncertainties in the other. Accounting for nuclear uncertainties resolves some of the tensions in the global fit of the proton PDFs, especially those between the nuclear data and the extended LHC data set used in NNPDF4.0.
hep-phSciPost Phys.Proc.(2022)·3 citations
08*
A Light Mediator Relating Neutrino Reactions
I. Alikhanov🇷🇺 · E. A. Paschos🇩🇪
The extension of the standard model with a multiplicative $U (1)_{R}$ factor is consistent with a light vector boson. In its simplest realization, only right-handed particles carry charges of the new group. In this model, there is a residual $τ_{3 R}$ symmetry and one new coupling constant which correlates neutrino interactions. We compute new contributions to antineutrino $-$ electron scattering and coherent scattering on nuclei, and compare them with the XENON1T result.
hep-phUniverse(2021)·5 citations
09*
Quark and lepton flavor model with leptoquarks in a modular $A_{4}$ symmetry
Takaaki Nomura🇨🇳 · Hiroshi Okada🇰🇷 · Yuta Orikasa🇨🇿
We propose a quark-lepton model via leptoquarks and modular $A_{4}$ symmetry. Since the neutrino mass is induced at one-loop level mediated by down quarks as well as leptoquarks, we have to explain lepton and quark masses and mixings with a single modulus $τ$ . Here, we find predictions for lepton and quark sectors with unified modulus $τ$ , and show several constraints originating from leptoquarks.
hep-phEPJC(2021)·29 citations
10*
Wave function of a photon produced in the resonant scattering of twisted light by relativistic ions
Dmitry V. Karlovets🇷🇺 · Valeriy G. Serbo🇷🇺 · Andrey Surzhykov🇩🇪
We present a theoretical investigation of the resonant elastic scattering of twisted light, carrying angular momentum, by partially stripped ions. Special emphasis is placed on a question of whether the scattered radiation is also twisted. In order to investigate such an "angular momentum transfer", we develop an approach that allows us to find a quantum state of the final photon without projecting it onto a detector state. A general expression for this so--called \textit{evolved} state of outgoing radiation is derived and it can be used to analyze the resonant scattering by any ion, independently of its shell structure. Here, we illustrate our approach with the strong electric dipole $n S_{0} \to n^{'} P_{1} \to n S_{0}$ transitions, which play an important role for the Gamma Factory project at CERN. For the incident Bessel light, the scattered radiation is shown to be in a superposition of twisted modes with the projections of the total angular momentum $m_{f} = 0, \pm 1$ . The larger values of $m_{f}$ can be efficiently generated by inducing transitions of higher multiplicity. This angular momentum transfer, together with a remarkable cross section that is many orders of magnitude larger than that of the backward Compton scattering, makes the resonant photon scattering an effective tool for the production of twisted x-- and even gamma--rays at the Gamma Factory facility.
hep-phphysics.atom-phquant-phPRA(2021)·9 citations
11*
Tetraquark molecular states in the $D_{s} D ˉ_{s 1}$ and $D_{s}^{*} D ˉ_{s 0}^{*}$ mass spectrum
Zhi-Gang Wang🇨🇳 · Xiao-Song Yang🇨🇳 · Qi Xin🇨🇳
In the present work, we construct the color-singlet-color-singlet type four-quark currents to investigate the $D_{s} D ˉ_{s 1}$ and $D_{s}^{*} D ˉ_{s 0}^{*}$ tetraquark molecular states with the $J^{P C} = 1^{--}$ and $1^{-+}$ via the QCD sum rules, and obtain satisfactory results. We can search for the $D_{s} D ˉ_{s 1}$ and $D_{s}^{*} D ˉ_{s 0}^{*}$ tetraquark molecular states with the $J^{P C} = 1^{--}$ and $1^{-+}$ at the BESIII and Belle II in the future.
hep-phInt.J.Mod.Phys.A(2021)·4 citations
12*
Parameter symmetries of neutrino oscillations in vacuum, matter, and approximation schemes
Peter B. Denton🇺🇸 · Stephen J. Parke🇺🇸
Expressions for neutrino oscillations contain a high degree of symmetry, but typical forms for the oscillation probabilities mask these symmetries of the oscillation parameters. We elucidate the $2^{7}$ parameter symmetries of the vacuum parameters and draw connections to the choice of definitions of the parameters as well as interesting degeneracies. We also show that in the presence of matter an \emph{additional} set of $2^{7}$ parameter symmetries exist of the matter parameters. Due to the complexity of the exact expressions for neutrino oscillations in matter, numerous approximations have been developed; we show that under certain assumptions, approximate expressions have at most $2^{6}$ additional parameter symmetries of the matter parameters. We also include one parameter symmetry related to the LMA-Dark degeneracy that holds under the assumption of CPT invariance; this adds one additional factor of two to all of the above cases. Explicit, non-trivial examples are given of how physical observables in neutrino oscillations, such as the probabilities, CP violation, the position of the solar and atmospheric resonance, and the effective $Δ m^{2}$ 's for disappearance probabilities, are invariant under all of the above symmetries. We investigate which of these parameter symmetries apply to numerous approximate expressions in the literature and show that a more careful consideration of symmetries improves the precision of approximations.
hep-phPRD(2022)·17 citations
13*
$η^{(^{'})} \to π^{+} π^{-} γ^{(*)}$ in large- $N_{c}$ chiral perturbation theory
Patricia Bickert🇩🇪 · Stefan Scherer🇩🇪
We present a calculation of the decays $η^{(^{'})} \to π^{+} π^{-} γ^{(*)}$ at the one-loop level up to and including next-to-next-to-leading order (NNLO) in large- $N_{c}$ chiral perturbation theory. The numerical evaluation of the results is performed successively at LO, NLO, and NNLO, fitting the relevant low-energy constants to the available experimental data. We discuss the widths and decay spectra of $η^{(^{'})} \to π^{+} π^{-} γ$ as well as $η^{(^{'})} \to π^{+} π^{-} l^{+} l^{-}$ , with $l = e, μ$ .
hep-phnucl-exnucl-thPRD(2021)·1 citation
14*
Hadronic loop effects on the radiative decays of the first radial excitations of $η$ and $η^{'}$
Yin Cheng🇨🇳 · Qiang Zhao🇨🇳
Based on the one state assumption of $η (1405)$ and $η (1475)$ , thus, $η (1295)$ and $η (1405/1475)$ are organized as the first radial excitations of $η$ and $η^{'}$ , respectively, we investigate the productions and radiative decays of these two states in $J / ψ \to γ η_{X} \to γ γ V$ , where $η_{X}$ stands for $η (1295)$ and $η (1405/1475)$ and $V$ for vector mesons $ρ^{0}, ω, ϕ$ . As we have learned from previous studies that the hadronic decays of these two states receive important contributions from the intermediate $K ˉ K^{*} + c . c .$ meson loops due to the triangle singularity mechanism, we show that some measurable effects can also arise from the $K ˉ K^{*} + c . c .$ meson loops in their radiative decays. Our calculation shows that the impact of the $K ˉ K^{*} + c . c .$ meson loops on the $η (1405/1475)$ radiative decays is relatively smaller than on $η (1295)$ since the latter has a much larger coupling to $K ˉ K^{*} + c . c .$ However, the production of $η (1295)$ in the $J / ψ$ radiative decays will be strongly suppressed. As a consequence of the $K ˉ K^{*} + c . c .$ meson loop contributions, we find that the mixing angle extracted in the radiative decays of $η (1295)$ and $η (1405/1475)$ will be different from each other, and both are different from the one determined in other processes.
hep-phPRD(2022)·13 citations
15*
Non $-$ zero $θ_{13}$ and $δ_{C P}$ phase with $A_{4}$ Flavor Symmetry and Deviations to Tri $-$ Bi $-$ Maximal mixing via $Z_{2} \times Z_{2}$ invariant perturbations in the Neutrino sector
Gayatri Ghosh🇮🇳
In this work, a flavour theory of a neutrino mass model based on $A_{4}$ symmetry is considered to explain the phenomenology of neutrino mixing. The spontaneous symmetry breaking of $A_{4}$ symmetry in this model leads to tribimaximal mixing in the neutrino sector at a leading order. We consider the effect of $Z_{2} \times Z_{2}$ invariant perturbations in neutrino sector and find the allowed region of correction terms in the perturbation matrix that is consistent with 3 $σ$ ranges of the experimental values of the mixing angles. We study the entanglement of this formalism on the other phenomenological observables, such as $δ_{C P}$ phase, the neutrino oscillation probability $P (ν_{μ} \to ν_{e})$ , the effective Majorana mass $∣ m_{ee} ∣$ and $∣ m_{ν e}^{e f f} ∣$ . A $Z_{2} \times Z_{2}$ invariant perturbations in this model is introduced in the neutrino sector which leads to testable predictions of $θ_{13}$ and CP violation. By changing the magnitudes of perturbations in neutrino sector, one can generate viable values of $δ_{C P}$ and neutrino oscillation parameters. Next we investigate the feasibility of charged lepton flavour violation in type-I seesaw models with leptonic flavour symmetries at high energy that leads to tribimaximal neutrino mixing. We consider an effective theory with an $A_{4} \times Z_{2} \times Z_{2}$ symmetry, which after spontaneous symmetry breaking at high scale which is much higher than the electroweak scale leads to charged lepton flavour violation processes once the heavy Majorana neutrino mass degeneracy is lifted either by renormalization group effects or by a soft breaking of the $A_{4}$ symmetry. In this context the implications for charged lepton flavour violation processes like $μ \to e γ$ , $τ \to e γ$ , $τ \to μ γ$ are discussed.
hep-phNPB(2022)·11 citations
16*
Yang-Mills propagators in linear covariant gauges from Nielsen identities
Martin Napetschnig🇦🇹 · Reinhard Alkofer🇦🇹 · Markus Q. Huber🇩🇪 · Jan M. Pawlowski🇩🇪
We calculate gluon and ghost propagators in Yang-Mills theory in linear covariant gauges. To that end, we utilize Nielsen identities with Landau gauge propagators and vertices as the starting point. We present and discuss numerical results for the gluon and ghost propagators for values of the gauge parameter $0 < ξ \leq 5$ . Extrapolating the propagators to $ξ \to \infty$ we find the expected qualitative behavior. We provide arguments that our results are quantitatively reliable at least for values $ξ ≲ 1/2$ of the gauge fixing parameter. It is shown that the correlation functions, and in particular the ghost propagator, change significantly with increasing gauge parameter. In turn, the ghost-gluon running coupling as well as the position of the zero crossing of the Schwinger function of the gluon propagator remain within the uncertainties of our calculation unchanged.
hep-phPRD(2021)·24 citations
17*
Resurrecting the Fraternal Twin WIMP Miracle
David Curtin🇨🇦 · Shayne Gryba🇨🇦 · Dan Hooper🇺🇸 · Jakub Scholtz🇬🇧 · Jack Setford🇨🇦
In Twin Higgs models which contain the minimal particle content required to address the little hierarchy problem (i.e. fraternal models), the twin tau has been identified as a promising candidate for dark matter. In this class of scenarios, however, the elastic scattering cross section of the twin tau with nuclei exceeds the bounds from XENON1T and other recent direct detection experiments. In this paper, we propose a modification to the Fraternal Twin Higgs scenario that we call $Z_{2}$ FTH, incorporating visible and twin hypercharged scalars (with $Y = 2$ ) which break twin electromagnetism. This leads to new mass terms for the twin tau that are unrelated to its Yukawa coupling, as well as additional annihilation channels via the massive twin photon. We show that these features make it possible for the right-handed twin tau to freeze out with an acceptable thermal relic abundance while scattering with nuclei at a rate that is well below existing constraints. Nonetheless, large portions of the currently viable parameter space in this model are within the reach of planned direct detection experiments. The prospects for indirect detection using gamma rays and cosmic-ray antiprotons are also promising in this model. Furthermore, if the twin neutrino is light, the predicted deviation of $Δ N_{eff} \approx 0.1$ would be within reach of Stage 4 CMB experiments. Finally, the high luminosity LHC should be able to probe the entire parameter space of the $Z_{2}$ FTH model through charged scalar searches. We also discuss how searches for long-lived particles are starting to constrain Fraternal Twin Higgs models.
hep-phPRD(2022)·30 citations
18*
Flavour anomalies and the muon $g - 2$ from feebly interacting particles
Luc Darmé🇮🇹 · Marco Fedele🇩🇪 · Kamila Kowalska🇵🇱 · Enrico Maria Sessolo🇵🇱
We perform a phenomenological analysis of simplified models of light, feebly interacting particles~(FIPs)that can provide a combined explanation of the anomalies in $b \to s l^{+} l^{-}$ transitions at LHCb and the anomalous magnetic moment of the muon. Different scenarios are categorised according to the explicit momentum dependence of the FIP coupling to the $b - s$ and $μ - μ$ vector currents and they are subject to several constraints from flavour and precision physics. We show that viable combined solutions to the muon $g - 2$ and flavour anomalies exist with the exchange of a vector FIP with mass larger than $4 GeV$ . Interestingly, the LHC has the potential to probe this region of the parameter space by increasing the precision of the $Z \to 4 μ$ cross-section measurement. Conversely, we find that solutions based on the exchange of a lighter vector, in the $m_{V} < 1 GeV$ range, are essentially excluded by a combination of $B \to K + invisible$ and $W$ -decay precision bounds.
hep-phhep-exJHEP(2022)·26 citations
19*
Dark Matter Absorption via Electronic Excitations
Andrea Mitridate🇺🇸 · Tanner Trickle🇺🇸 · Zhengkang Zhang🇺🇸 · Kathryn M. Zurek🇺🇸
We revisit the calculation of bosonic dark matter absorption via electronic excitations. Working in an effective field theory framework and consistently taking into account in-medium effects, we clarify the relation between dark matter and photon absorption. As is well-known, for vector (dark photon) and pseudoscalar (axion-like particle) dark matter, the absorption rates can be simply related to the target material's optical properties. However, this is not the case for scalar dark matter, where the dominant contribution comes from a different operator than the one contributing to photon absorption, which is formally next-to-leading-order and does not suffer from in-medium screening. It is therefore imperative to have reliable first-principles numerical calculations and/or semi-analytic modeling in order to predict the detection rate. We present updated sensitivity projections for semiconductor crystal and superconductor targets for ongoing and proposed direct detection experiments.
hep-phJHEP(2021)·59 citations
20*
Catalyzed Baryogenesis
Yang Bai🇺🇸 · Joshua Berger🇺🇸 · Mrunal Korwar🇺🇸 · Nicholas Orlofsky🇨🇦
A novel mechanism, "catalyzed baryogenesis," is proposed to explain the observed baryon asymmetry in our universe. In this mechanism, the motion of a ball-like catalyst provides the necessary out-of-equilibrium condition, its outer wall has CP-violating interactions with the Standard Model particles, and its interior has baryon number violating interactions. We use the electroweak-symmetric ball model as an example of such a catalyst. In this model, electroweak sphalerons inside the ball are active and convert baryons into leptons. The observed baryon number asymmetry can be produced for a light ball mass and a large ball radius. Due to direct detection constraints on relic balls, we consider a scenario in which the balls evaporate, leading to dark radiation at testable levels.
hep-phastro-ph.COJHEP(2021)·9 citations
21*
New Techniques for Worldline Integration
James P. Edwards🇲🇽 · C. Moctezuma Mata🇲🇽 · Uwe Müller🇩🇪 · Christian Schubert🇲🇽
The worldline formalism provides an alternative to Feynman diagrams in the construction of amplitudes and effective actions that shares some of the superior properties of the organization of amplitudes in string theory. In particular, it allows one to write down integral representations combining the contributions of large classes of Feynman diagrams of different topologies. However, calculating these integrals analytically without splitting them into sectors corresponding to individual diagrams poses a formidable mathematical challenge. We summarize the history and state of the art of this problem, including some natural connections to the theory of Bernoulli numbers and polynomials and multiple zeta values.
↳ hep-thhep-phSIGMA(2021)·20 citations
22*
Exploring Lorentz Invariance Violation from Ultra-high-energy Gamma Rays Observed by LHAASO
Zhen Cao · F. Aharonian · Q. An · Axikegu · L.X. Bai · Y.X. Bai · Y.W. Bao · D. Bastieri · X.J. Bi · Y.J. Bi · H. Cai · J.T. Cai and 262 other authors
Recently the LHAASO Collaboration published the detection of 12 ultra-high-energy gamma-ray sources above 100 TeV, with the highest energy photon reaching 1.4 PeV. The first detection of PeV gamma rays from astrophysical sources may provide a very sensitive probe of the effect of the Lorentz invariance violation (LIV), which results in decay of high-energy gamma rays in the superluminal scenario and hence a sharp cutoff of the energy spectrum. Two highest energy sources are studied in this work. No signature of the existence of LIV is found in their energy spectra, and the lower limits on the LIV energy scale are derived. Our results show that the first-order LIV energy scale should be higher than about 10^5 times the Planck scale M_{pl} and that the second-order LIV scale is >10^{-3}M_{pl}. Both limits improve by at least one order of magnitude the previous results.
↳ astro-ph.HEhep-phPRL(2022)·54 citations
23*
Generalizations of the Double-Copy: the KLT Bootstrap
Huan-Hang Chi🇺🇸 · Henriette Elvang🇺🇸 · Aidan Herderschee🇺🇸 · Callum R. T. Jones🇺🇸 · Shruti Paranjape🇺🇸
We formulate a new program to generalize the double-copy of tree amplitudes. The approach exploits the link between the identity element of the KLT algebra and the KLT kernel, and we demonstrate how this leads to a set of KLT bootstrap equations that the double-copy kernel has to satisfy (in addition to locality constraints). We solve the KLT bootstrap equations perturbatively to find the most general higher-derivative corrections to the 4- and 5-point field theory KLT kernel. The new kernel generalizes the string KLT kernel and its associated monodromy relations. It admits new color-structures in the effective theories it double-copies. It provides distinct generalized KK and BCJ relations for the left and right single-color theories and is in that sense a heterotic-type double-copy. We illustrate the generalized double-copy in detail for 4d Yang-Mills theory with higher-derivative corrections that produce dilaton-axion-gravity with local operators up order $\nabla^{10} R^{4}$ . Finally, we initiate a search for new double-copy kernels.
↳ hep-thhep-phJHEP(2022)·65 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.