HEP Phenomenology·hep-ph

Mon·Mar 27, 2023Monday·March 27, 2023

27 papers—15 primary·12 cross-listed·reconstructed*

01*
On discrete Goldstone bosons
Victor Enguita-Vileta🇪🇸 · Belen Gavela🇪🇸 · Rachel Houtz🇬🇧 · Pablo Quilez🇺🇸
Exact discrete symmetries, if non-linearly realized, can reduce the ultraviolet sensitivity of a given theory. The scalars stemming from spontaneous symmetry breaking are massive without breaking the discrete symmetry, and those masses are protected from divergent quadratic corrections. This is in contrast to non-linearly realized continuous symmetries. The symmetry-protected masses and potentials of those discrete Goldstone bosons offer promising physics avenues, both theoretically and in view of the blooming experimental search for ALPs. In this text, we develop this theoretical setup for the specific case of a triplet of $A_{5}$ using invariant theory, showcasing the substantial improvements and compelling phenomenological consequences introduced by the invariance under a discrete symmetry.
hep-phPoS(2024)·0 citations
02*
High-energy neutrino deep inelastic scattering cross sections
Keping Xie🇺🇸 · Jun Gao🇨🇳 · T. J. Hobbs🇺🇸 · Daniel R. Stump🇺🇸 · C.-P. Yuan🇺🇸
We present a state-of-the-art prediction for cross sections of neutrino deep inelastic scattering (DIS) from nucleon at high neutrino energies, $E_{ν}$ , from 100 GeV to 1000 EeV ( $1 0^{12}$ GeV). Our calculations are based on the latest CT18 NNLO parton distribution functions (PDFs) and their associated uncertainties. In order to make predictions for the highest energies, we extrapolate the PDFs to small $x$ according to several procedures and assumptions, thus affecting the uncertainties at ultra-high $E_{ν}$ ; we quantify the uncertainties corresponding to these choices. Similarly, we quantify the uncertainties introduced by the nuclear corrections which are required to evaluate neutrino-nuclear cross sections for neutrino telescopes. These results can be applied to currently-running astrophysical neutrino observatories, such as IceCube and KM3NeT, as well as various future experiments which have been proposed.
hep-phhep-exnucl-thPRD(2024)·34 citations
03*
Multipole vector dark matter below the GeV-scale
Xiaoyong Chu🇦🇹 · Junji Hisano🇯🇵 · Alejandro Ibarra🇩🇪 · Jui-Lin Kuo🇺🇸 · Josef Pradler🇦🇹
We consider electrically neutral complex vector particles $V$ below the GeV mass scale that, from a low energy perspective, couple to the photon via higher dimensional form factor interactions. We derive ensuing astrophysical constraints by considering the anomalous energy loss from the Sun, Horizontal Branch, and Red Giant stars as well as from SN1987A that arise from vector pair-production in these environments. Under the assumption that the dark states $V$ constitute dark matter, the bounds are then complemented by direct and indirect detection as well as cosmological limits. The relic density from freeze-out and freeze-in mechanisms is also computed. On the basis of a UV-complete model that realizes the considered effective couplings, we also discuss the naturalness of the constrained parameter space, and provide an analysis of the zero mass limit of $V$ .
hep-phastro-ph.HEPRD(2023)·15 citations
04*
Phenomenology of double deeply virtual Compton scattering in the era of new experiments
K. Deja🇵🇱 · V. Martinez-Fernandez🇵🇱 · B. Pire🇫🇷 · P. Sznajder🇵🇱 · J. Wagner🇵🇱
We revisit the phenomenology of the deep exclusive electroproduction of a lepton pair, i.e. double deeply virtual Compton scattering (DDVCS), in view of new experiments planned in the near future. The importance of DDVCS in the reconstruction of generalized parton distributions (GPDs) in their full kinematic domain is emphasized. Using Kleiss-Stirling spinor techniques, we provide the leading order complex amplitudes for both DDVCS and Bethe-Heithler sub-processes. Such a formulation turns out to be convenient for practical implementation in the PARTONS framework and EpIC Monte Carlo generator that we use in simulation studies.
hep-phhep-exnucl-exnucl-thPRD(2023)·53 citations
05*
Inferring astrophysical neutrino sources from the Glashow resonance
Guo-yuan Huang🇩🇪 · Manfred Lindner🇩🇪 · Nele Volmer🇩🇪
We infer the ultrahigh energy neutrino source by using the Glashow resonance candidate event recently identified by the IceCube Observatory. For the calculation of the cross section for the Glashow resonance, we incorporate both the atomic Doppler broadening effect and initial state radiation $ν_{e} e^{-} \to W^{-} γ$ , which correct the original cross section considerably. Using available experimental information, we have set a generic constraint on the $ν_{e}$ fraction of astrophysical neutrinos, which excludes the $μ$ -damped $p γ$ source around $2 σ$ confidence level under the assumption that neutrino production is dominated by the $Δ$ -resonance. While a weak preference has been found for the pp source, next-generation measurements will be able to distinguish between ideal pp and p $γ$ sources with a high significance assuming an optimistic single power-law neutrino spectrum. The inclusion of multi-pion production at very high energies for the neutrino source can weaken the discrimination power. In this case additional multimessenger information is needed to distinguish between pp and p $γ$ sources.
hep-phastro-ph.HEhep-exJHEP(2023)·11 citations
06*
Small- $x$ Factorization from Effective Field Theory
Duff Neill🇺🇸 · Aditya Pathak🇩🇪 · Iain Stewart🇺🇸
We derive a factorization theorem that allows for resummation of small- $x$ logarithms by exploiting Glauber operators in the soft collinear effective field theory. Our analysis is carried out for the hadronic tensor $W^{μν}$ in deep inelastic scattering, and leads to the definition of a new gauge invariant soft function $S^{μν}$ that describes quark and gluon emission in the central region. This soft function provides a new framework for extending resummed calculations for coefficient functions to higher logarithmic orders. Our factorization also defines impact factors by universal collinear functions that are process independent, for instance being identical in small- $x$ DIS and Drell-Yan.
hep-phnucl-thJHEP(2023)·13 citations
07*
Strong decays of the low-lying $1 P$ - and $1 D$ -wave $Σ_{c}$ baryons
Yu-Hui Zhou🇨🇳 · Wen-Jia Wang🇨🇳 · Li-Ye Xiao🇨🇳 · Xian-Hui Zhong🇨🇳
In this work, we systematically study the OZI-allowed two-body strong decay properties of $1 P$ - and $1 D$ -wave $Σ_{c}$ baryons within the $j$ - $j$ coupling scheme in the framework of the quark pair creation model. For a comparison, we also give the predictions of the chiral quark model. Some model dependencies can be found in the predictions of two models. The calculations indicate that: (i) The $1 P$ -wave $λ$ -mode $Σ_{c}$ states most likely to be relatively narrow states with a width of $Γ < 80$ MeV. Their main decay channels are $Λ_{c} π$ , or $Σ_{c} π$ , or $Σ_{c}^{*} π$ . The $1 P$ -wave $ρ$ -mode states most might be broad states with a width of $Γ \sim 100 - 200$ MeV. They dominantly decay into $Σ_{c} π$ and $Σ_{c}^{*} π$ channels. Some evidences of these $1 P$ -wave states are most likely to be observed in the $Λ_{c} π$ and $Λ_{c} π π$ invariant mass spectra around the energy range of $2.75 - 2.95$ GeV. (ii) The $1 D$ -wave $λ$ -mode $Σ_{c}$ excitations may be moderate states with a width of about dozens of MeV. The $1 D$ -wave $λ$ -mode states mainly decay into the $1 P$ -wave charmed baryon via the pionic decay processes. Meanwhile, several $1 D$ -wave $λ$ -mode states have significant decay rates into $D N$ or $D^{*} N$ . Hence, the $D N$ and $D^{*} N$ are likely to be interesting channels for experimental exploration. (iii) Furthermore, the two $1 D$ -wave $ρ$ -mode excitations $Σ_{c} ∣ J^{P} = 5/ 2^{+}, 3 ⟩_{ρρ}$ and $∣ J^{P} = 7/ 2^{+}, 3 ⟩_{ρρ}$ are most likely to be fairly narrow state with a width of dozens of MeV, and they mainly decay into $Λ_{c} π$ . Some evidences of them might be observed in the $Λ_{c} π$ invariant mass spectra around the energy range of $3.1 - 3.2$ GeV.
hep-phPRD(2023)·9 citations
08*
Topological Reconstruction of Particle Physics Processes using Graph Neural Networks
Lukas Ehrke🇨🇭 · John Andrew Raine🇨🇭 · Knut Zoch🇨🇭 · Manuel Guth🇨🇭 · Tobias Golling🇨🇭
We present a new approach, the Topograph, which reconstructs underlying physics processes, including the intermediary particles, by leveraging underlying priors from the nature of particle physics decays and the flexibility of message passing graph neural networks. The Topograph not only solves the combinatoric assignment of observed final state objects, associating them to their original mother particles, but directly predicts the properties of intermediate particles in hard scatter processes and their subsequent decays. In comparison to standard combinatoric approaches or modern approaches using graph neural networks, which scale exponentially or quadratically, the complexity of Topographs scales linearly with the number of reconstructed objects. We apply Topographs to top quark pair production in the all hadronic decay channel, where we outperform the standard approach and match the performance of the state-of-the-art machine learning technique.
hep-phcs.LGhep-exPRD(2023)·25 citations
09*
Reviewing the prospect of fermion triplets as dark matter and source of baryon asymmetry in non-standard cosmology
Anirban Biswas🇰🇷 · Mainak Chakraborty🇮🇳 · Sarif Khan🇩🇪
Indirect searches of Dark Matter (DM), in conjugation with `missing track searches' at the collider seem to confine SU(2) $_{L}$ fermion triplet DM (FTDM) mass within a narrow range around 1 TeV. The canonical picture of the pure FTDM is in tension since it is under-abundant for the said mass range. Several preceding studies have reported that an extra species ( $ϕ$ ), redshifts faster than the radiation ( $\sim a^{- (4 + n)}$ where $n > 0$ ), leads to a faster expanding early Universe by dominating in the energy density with an enhanced Hubble parameter. This has the potential to revive the under-abundant FTDM ( $Z_{2}$ odd, lightest generation) by causing freeze-out earlier without modifying the interaction strength between DM and thermal bath. On the other hand, although the CP asymmetry produced due to the decay of $Z_{2}$ even heavier generations of the triplet remains unaffected, its evolution is greatly affected by the non-standard cosmology. It has been observed through numerical estimations that the minimum mass of the triplet, required to produce sufficient baryon asymmetry of the Universe (BAU), can be lowered up to two orders (compared to the standard cosmology) in this fast expansion scenario. The non-standard parameters $n$ and $T_{r}$ (a reference temperature below which radiation dominance prevails), which simultaneously control DM abundance as well as the frozen value of BAU, are tightly constrained from the observed experimental values. We have found that $n$ is strictly bounded within the interval $0.4 ≲ n ≲ 1.8$ where the upper bound is imposed by the BAU constraint whereas the lower bound arises to satisfy the correct DM abundance. It has been noticed that the restriction on $T_{r}$ is not so stringent as it can vary from sub-GeV to a few tens of GeV.
hep-phastro-ph.COJCAP(2023)·6 citations
10*
Analysis of the D-wave $Σ$ -type charmed baryon states with the QCD sum rules
Zhi-Gang Wang🇨🇳 · Fei Lu🇨🇳 · Yang Liu🇨🇳
We construct the $Σ$ -type currents to investigate the D-wave charmed baryon states with the QCD sum rules systematically. The predicted masses $M = 3.3 5_{- 0.18}^{+ 0.13} GeV$ ( $3.3 3_{- 0.16}^{+ 0.13} GeV$ ), $3.3 4_{- 0.18}^{+ 0.14} GeV$ ( $3.3 5_{- 0.16}^{+ 0.13} GeV$ ) and $3.3 5_{- 0.13}^{+ 0.12} GeV$ ( $3.3 5_{- 0.14}^{+ 0.12} GeV$ ) for the $Ω_{c} (0, 2, \frac{1}{2}^{+})$ , $Ω_{c} (0, 2, \frac{3}{2}^{+})$ and $Ω_{c} (0, 2, \frac{5}{2}^{+})$ states are in excellent agreement with the experimental data $3327.1 \pm 1.2 \mbox M e V$ from the LHCb collaboration, and support assigning the $Ω_{c} (3327)$ to be the $Σ$ -type D-wave $Ω_{c}$ state with the spin-parity $J^{P} = \frac{1}{2}^{+}$ , $\frac{3}{2}^{+}$ or $\frac{5}{2}^{+}$ .
hep-phEPJC(2023)·21 citations
11*
Exclusive diffractive bremsstrahlung of one and two photons at forward rapidities: Possibilities for experimental studies in $pp$ collisions at the LHC
Piotr Lebiedowicz🇵🇱 · Otto Nachtmann🇩🇪 · Antoni Szczurek🇵🇱
We evaluate the cross section for diffractive bremsstrahlung of a single photon in the $pp \to pp γ$ reaction at high energies and at forward photon rapidities. Several differential distributions, for instance, in $y$ , $k_{⊥}$ and $ω$ , the rapidity, the absolute value of the transverse momentum, and the energy of the photon, respectively, are presented. We compare the results for our standard approach, based on QFT and the tensor-pomeron model, with two versions of soft-photon-approximations, SPA1 and SPA2, where the radiative amplitudes contain only the leading terms proportional to $ω^{- 1}$ . The SPA1, which does not have the correct energy-momentum relations, performs surprisingly well in the kinematic range considered. We discuss also azimuthal correlations between outgoing particles. The azimuthal distributions are not isotropic and are different for our standard model and SPAs. We discuss also the possibility of a measurement of two-photon-bremsstrahlung in the $pp \to pp γ γ$ reaction. In our calculations we impose a cut on the relative energy loss ( $0.02 < ξ_{i} < 0.1$ , $i = 1, 2$ ) of the protons where measurements by the ATLAS Forward Proton (AFP) detectors are possible. The AFP requirement for both diffractively scattered protons and one forward photon (measured at LHCf) reduces the cross section for $pp \to pp γ$ almost to zero. On the other hand, much less cross-section reduction occurs for $pp \to pp γ γ$ when photons are emitted in opposite sides of the ATLAS interaction point and can be measured by two different arms of LHCf. For the SPA1 ansatz we find $σ (pp \to pp γ γ) ≃ 0.03$ nb at $s = 13$ TeV and with the cuts $0.02 < ξ_{i} < 0.1$ , $8.5 < y_{3} < 9$ , $- 9 < y_{4} < - 8.5$ . Our predictions can be verified by ATLAS and LHCf combined experiments.
hep-phhep-exPLB(2023)·4 citations
12*
Primordial black hole dark matter from catastrogenesis with unstable pseudo-Goldstone bosons
Graciela B. Gelmini🇺🇸 · Jonah Hyman🇺🇸 · Anna Simpson🇺🇸 · Edoardo Vitagliano🇮🇱
We propose a new scenario for the formation of asteroid-mass primordial black holes (PBHs). Our mechanism is based on the annihilation of the string-wall network associated with the breaking of a $U (1)$ global symmetry into a discrete $Z_{N}$ symmetry. If the potential has multiple local minima ( $N > 1$ ) the network is stable, and the annihilation is guaranteed by a bias among the different vacua. The collapse of the string-wall network is accompanied by catastrogenesis, a large production of pseudo-Goldstone bosons (pGBs) -- e.g. axions, ALPs, or majorons -- gravitational waves, and PBHs. If pGBs rapidly decay into products that thermalize, as predicted e.g. in the high-quality QCD axion and heavy majoron models, they do not contribute to the dark matter population, but we show that PBHs can constitute 100\% of the dark matter. The gravitational wave background produced by catastrogenesis with heavy unstable axions, ALPs, or majorons could be visible in future interferometers.
hep-phastro-ph.COJCAP(2023)·50 citations
13*
The Mass-ive Issue: Anomaly Detection in Jet Physics
Tobias Golling🇨🇭 · Takuya Nobe🇨🇭 · Dimitrios Proios🇨🇭 · John Andrew Raine🇨🇭 · Debajyoti Sengupta🇨🇭 · Slava Voloshynovskiy🇨🇭 · Jean-Francois Arguin🇨🇦 · Julien Leissner Martin🇨🇦 · Jacinthe Pilette🇨🇦 · Debottam Bakshi Gupta🇺🇸 · Amir Farbin🇺🇸
In the hunt for new and unobserved phenomena in particle physics, attention has turned in recent years to using advanced machine learning techniques for model independent searches. In this paper we highlight the main challenge of applying anomaly detection to jet physics, where preserving an unbiased estimator of the jet mass remains a critical piece of any model independent search. Using Variational Autoencoders and multiple industry-standard anomaly detection metrics, we demonstrate the unavoidable nature of this problem.
hep-ph11 citations
14*
Centrality-dependent modification of hadron and jet production in electron-nucleus collisions
Hai Tao Li🇨🇳 · Ze Long Liu🇨🇭 · Ivan Vitev🇺🇸
Centrality-dependent measurements of hadron and jet cross section attenuation in deep inelastic scattering on nuclei can shed new light on the physics of final-state interactions in the nuclear matter, including the path-length dependence of the in-medium parton shower formation and evolution. Recent simulation studies have demonstrated the feasibility of experimental centrality determination in $e$ A reactions at the electron-ion collider via neutron detection in the zero-degree calorimeter. Motivated by these results, we present the first theoretical calculation of the production rate modification for hadrons and jets in central and peripheral $e$ Pb collisions. We find that the variation in the suppression of inclusive jet cross section as a function of centrality is less than a factor of two. In more differential measurements, such as the distribution of hadrons versus the hadronization fraction $z_{h}$ , the difference can be enhanced up to an order of magnitude.
hep-phnucl-thPLB(2024)·8 citations
15*
Invisible Higgs from forward muons at a muon collider
Maximilian Ruhdorfer🇺🇸 · Ennio Salvioni🇮🇹 · Andrea Wulzer🇪🇸
We propose to probe the Higgs boson decay to invisible particles at a muon collider by observing the forward muons that are produced in association with the Higgs in the Z-boson fusion channel. An excellent sensitivity is possible in line of principle, owing to the large number of produced Higgs bosons, provided a forward muon detector is installed. We find that the resolution on the measurement of the muon energy and angle will be the main factor limiting the actual sensitivity. This poses tight requirements on the forward muon detector design.
hep-phhep-exPRD(2023)·43 citations
16*
The Gallium Neutrino Absorption Cross Section and its Uncertainty
S. R. Elliott🇺🇸 · V.N. Gavrin🇷🇺 · W. C. Haxton🇺🇸 · T. V. Ibragimova🇷🇺 · E. J. Rule🇺🇸
In the recent Baksan Experiment on Sterile Transitions (BEST), a suppressed rate of neutrino absorption on a gallium target was observed, consistent with earlier results from neutrino source calibrations of the SAGE and GALLEX/GNO solar neutrino experiments. The BEST collaboration, utilizing a 3.4 MCi 51Cr neutrino source, found observed-to-expected counting rates at two very short baselines of R=0.791 plus/minus 0.05 and 0.766 plus/minus 0.05, respectively. Among recent neutrino experiments, BEST is notable for the simplicity of both its neutrino spectrum, line neutrinos from an electron-capture source whose intensity can be measured to a estimated precision of 0.23%, and its absorption cross section, where the precisely known rate of electron capture to the gallium ground state, 71Ge(e,nue)71Ga(g.s.), establishes a minimum value. However, the absorption cross section uncertainty is a common systematic in the BEST, SAGE, and GALLEX/GNO neutrino source experiments. Here we update that cross section, considering a variety of electroweak corrections and the role of transitions to excited states, to establish both a central value and reasonable uncertainty, thereby enabling a more accurate assessment of the statistical significance of the gallium anomalies. Results are given for 51Cr and 37Ar sources. The revised neutrino capture rates are used in a re-evaluation of the BEST and gallium anomalies.
↳ nucl-thhep-exhep-phnucl-exPRC(2023)·25 citations
17*
Search for neutrino lines from dark matter annihilation and decay with IceCube
The IceCube Collaboration: R. Abbasi · M. Ackermann · J. Adams · S. K. Agarwalla · J. A. Aguilar · M. Ahlers · J.M. Alameddine · N. M. Amin · K. Andeen · G. Anton · C. Argüelles · Y. Ashida and 385 other authors
Dark Matter particles in the Galactic Center and halo can annihilate or decay into a pair of neutrinos producing a monochromatic flux of neutrinos. The spectral feature of this signal is unique and it is not expected from any astrophysical production mechanism. Its observation would constitute a dark matter smoking gun signal. We performed the first dedicated search with a neutrino telescope for such signal, by looking at both the angular and energy information of the neutrino events. To this end, a total of five years of IceCube's DeepCore data has been used to test dark matter masses ranging from 10~GeV to 40~TeV. No significant neutrino excess was found and upper limits on the annihilation cross section, as well as lower limits on the dark matter lifetime, were set. The limits reached are of the order of $1 0^{- 24}$ ~cm $^{3} / s$ for an annihilation and up to $1 0^{27}$ seconds for decaying Dark Matter. Using the same data sample we also derive limits for dark matter annihilation or decay into a pair of Standard Model charged particles.
↳ astro-ph.HEhep-phPRD(2023)·102 citations
18*
Coupled vector Gauss-Bonnet theories and hairy black holes
Katsuki Aoki🇯🇵 · Shinji Tsujikawa🇯🇵
We study vector-tensor theories in which a 4-dimensional vector field $A_{μ}$ is coupled to a vector quantity $J^{μ}$ , which is expressed in terms of $A_{μ}$ and a metric tensor $g_{μν}$ . The divergence of $J^{μ}$ is equivalent to a Gauss-Bonnet (GB) term. We show that an interacting Lagrangian of the form $f (X) A_{μ} J^{μ}$ , where $f$ is an arbitrary function of $X = - (1/2) A_{μ} A^{μ}$ , belongs to a scheme of beyond generalized Proca theories. For $f (X) = α = constant$ , this interacting Lagrangian reduces to a particular class of generalized Proca theories. We apply the latter coupling to a static and spherically symmetric vacuum configuration by incorporating the Einstein-Hilbert term, Maxwell scalar, and vector mass term $η X$ ( $η$ is a constant). Under an expansion of the small coupling constant $α$ with $η \neq = 0$ , we derive hairy black hole solutions endowed with nonvanishing temporal and radial vector field profiles. The asymptotic properties of solutions around the horizon and at spatial infinity are different from those of hairy black holes present in scalar-GB theories. We also show that black hole solutions without the vector mass term, i.e., $η = 0$ , are prone to ghost instability of odd-parity perturbations.
↳ gr-qchep-phhep-thPLB(2023)·7 citations
19*
Borexino's search for low-energy neutrinos associated with gravitational wave events from GWTC-3 database
BOREXINO Collaboration · D. Basilico · G. Bellini · J. Benziger · R. Biondi · B. Caccianiga · F. Calaprice · A. Caminata · A. Chepurnov · D. D' Angelo · A. Derbin · A. Di Giacinto and 63 other authors
The search for neutrino events in correlation with gravitational wave (GW) events for three observing runs (O1, O2 and O3) from 09/2015 to 03/2020 has been performed using the Borexino data-set of the same period. We have searched for signals of neutrino-electron scattering with visible energies above 250 keV within a time window of 1000 s centered at the detection moment of a particular GW event. The search was done with three visible energy thresholds of 0.25, 0.8 and 3.0 MeV.Two types of incoming neutrino spectra were considered: the mono-energetic line and the spectrum expected from supernovae. The same spectra were considered for electron antineutrinos detected through inverse beta-decay (IBD) reaction. GW candidates originated by merging binaries of black holes (BHBH), neutron stars (NSNS) and neutron star and black hole (NSBH) were analysed separately. Additionally, the subset of most intensive BHBH mergers at closer distances and with larger radiative mass than the rest was considered. In total, follow-ups of 74 out of 93 gravitational waves reported in the GWTC-3 catalog were analyzed and no statistically significant excess over the background was observed. As a result, the strongest upper limits on GW-associated neutrino and antineutrino fluences for all flavors (\nu_e, \nu_\mu, \nu_\tau) have been obtained in the (0.5 - 5.0) MeV neutrino energy range.
↳ astro-ph.HEhep-exhep-phEPJC(2023)·6 citations
20*
One-loop algebras and fixed flow trajectories in adjoint multi-scalar gauge theory
Nadia Flodgren🇸🇪 · Bo Sundborg🇸🇪
We study the one loop renormalisation of 4d $S U (N)$ Yang-Mills theory with $M$ adjoint representation scalar multiplets related by $O (M)$ symmetry. General $M$ are of field theoretic interest, and the 4d one loop beta function of the gauge coupling $g^{2}$ vanishes for the case $M = 22$ , which is intriguing for string theory. This case is related to D3 branes of critical bosonic string theory in $D = 22 + 4 = 26$ . An RG fixed point could have provided a definition for a purely bosonic AdS/CFT, but we show that scalar self-couplings $λ$ ruin one-loop conformal invariance in the large $N$ limit. There are real fixed flows (fixed points of $λ / g^{2}$ ) only for $M \geq 406$ , rendering one-loop fixed points of the gauge coupling and scalar couplings incompatible. We develop and check an algebraic approach to the one-loop renormalisation group which we find to be characterised by a non-associative algebra of marginal couplings. In the large $N$ limit, the resulting RG flows typically suffer from strong coupling in both the ultraviolet and the infrared. Only for $M \geq 406$ fine-tuned solutions exist which are weakly coupled in the infrared.
↳ hep-thhep-phJHEP(2023)·5 citations
21*
The spatial string tension from the Field Correlator Method
N. O. Agasian🇷🇺 · Z. V. Khaidukov🇷🇺 · Yu. A. Simonov🇷🇺
The phenomenon of the almost linear growth of the square root of spatial string tension $σ_{s} (T) = c_{σ} g^{2} T$ was found both in lattice and in theory, based on the Field Correlator Method (FCM). In the latter the string tension (both spatial and colorelectric) is expressed as an integral of the two gluon Green's function calculated with the same string tension: $σ = \int G_{σ}^{(2 g)}$ . This relation allows to check the selfconsistency of the theory. However at nonzero temperature $T$ in the two-gluon Green's function in the space-like region appear terms which create in $σ_{s}$ quadratic in T behavior. We calculate below in the paper the $σ_{s}$ numerically in the whole temperature region $T_{c} < T < 5 T_{c}$ using the FCM method and compare the results with lattice data finding a good agreement. This justifies the use of the FCM in the space-like region and in high T thermodynamics without extra parameters.
↳ hep-lathep-phEPJC(2023)·4 citations
22*
Primordial feature constraints from BOSS+eBOSS
Thiago Mergulhão🇬🇧 · Florian Beutler🇬🇧 · John A. Peacock🇬🇧
Understanding the universe in its pristine epoch is crucial in order to obtain a concise comprehension of the late-time universe. Although current data in cosmology are compatible with Gaussian primordial perturbations whose power spectrum follows a nearly scale-invariant power law, this need not be the case when a fundamental theoretical construction is assumed. These extended models lead to sharp features in the primordial power spectrum, breaking its scale invariance. In this work, we obtain combined constraints on four primordial feature models by using the final data release of the BOSS galaxies and eBOSS quasars. By pushing towards the fundamental mode of these surveys and using the larger eBOSS volume, we were able to extend the feature parameter space (i.e. the feature frequency $ω$ ) by a factor of four compared to previous analyses using BOSS. While we did not detect any significant features, previous work showed that next-generation galaxy surveys such as DESI will improve the sensitivity to features by a factor of 7, and will also extend the parameter space by a factor of 2.5.
↳ astro-ph.COgr-qchep-phJCAP(2023)·24 citations
23*
SKA sensitivity for possible radio emission from dark matter in Omega Centauri
Guan-Sen Wang🇨🇳 · Zhan-Fang Chen🇨🇳 · Lei Zu🇨🇳 · Hao Gong🇨🇳 · Lei Feng🇨🇳 · Yi-Zhong Fan🇨🇳
Omega Centauri, the largest known globular cluster in the Milky Way, is believed to be the remains of a dwarf galaxy's core. Giving its potential abundance of dark matter (DM), it is an attractive target for investigating the nature of this elusive substance in our local environment. Our study demonstrates that by observing Omega Centauri with the SKA for 1000 hours, we can detect synchrotron radio or Inverse Compton (IC) emissions from the DM annihilation products. It enables us to constrain the cross-section of DM annihilation down to $\sim 1 0^{- 30} c m^{3} s^{- 1}$ for DM mass from several $GeV$ to $100 GeV$ , which is much stronger compared with other observations. Additionally, we explore the axion, another well-motivated DM candidate, and provide stimulated decay calculations. It turns out that the sensitivity can reach $g_{a γ γ} \sim 1 0^{- 10} Ge V^{- 1}$ for $2 \times 1 0^{- 7} eV < m_{a} < 2 \times 1 0^{- 4} eV$ .
↳ astro-ph.HEastro-ph.COhep-phJCAP(2024)·9 citations
24*
Implications of Palatini gravity for inflation and beyond
Ioannis D. Gialamas🇪🇪 · Alexandros Karam🇪🇪 · Thomas D. Pappas🇨🇿 · Eemeli Tomberg🇪🇪
We present an introduction to cosmic inflation in the framework of Palatini gravity, which provides an intriguing alternative to the conventional metric formulation of gravity. In the latter, only the metric specifies the spacetime geometry, whereas in the former, the metric and the spacetime connection are independent variables-an option that can result in a gravity theory distinct from the metric one. In scenarios where the field(s) responsible for cosmic inflation are non-minimally coupled to gravity or the gravitational sector is extended, assumptions about the underlying gravitational degrees of freedom can have substantial implications for the observational effects of inflation. We examine this explicitly by discussing various compelling scenarios, such as Higgs inflation with non-minimal coupling to gravity, Higgs inflation with non-minimal derivative coupling, $R^{2}$ inflation, and beyond. We also comment on reheating in these models. Finally, as an application of the general results of Palatini $R^{2}$ inflation, we review a model of successful quintessential inflation, where a single scalar field acts initially as the inflaton and then becomes dynamical dark energy, in agreement will all experimental constraints.
↳ gr-qcastro-ph.COhep-phhep-thInt.J.Geom.Meth.Mod.Phys.(2023)·53 citations
25*
Non-Gaussianity in rapid-turn multi-field inflation
Oksana Iarygina🇸🇪 · M.C. David Marsh🇸🇪 · Gustavo Salinas🇸🇪
We show that theories of inflation with multiple, rapidly turning fields can generate large amounts of non-Gaussianity. We consider a general theory with two fields, an arbitrary field-space metric, and a potential that supports sustained, rapidly turning field trajectories. Our analysis accounts for non-zero field cross-correlation and does not fix the power spectra of curvature and isocurvature perturbations to be equal at horizon crossing. Using the $δ N$ formalism, we derive a novel, analytical formula for bispectrum generated from multi-field mixing on super-horizon scales. Rapid-turn inflation can produce a bispectrum with several potentially large contributions that are not necessarily of the local shape. We exemplify the applicability of our formula with a fully explicit model and show that the new contributions indeed can generate a large amplitude of local non-Gaussianity, $f_{NL}^{loc} \sim O (1)$ . These results will be important when interpreting the outcomes of future observations.
↳ astro-ph.COgr-qchep-phhep-thJCAP(2024)·19 citations
26*
JEWEL on a (2+1)D background with applications to small systems and substructure
Isobel Kolbé🇪🇸
High- $p_{T}$ jets are an important tool for characterizing the quark-gluon plasma (QGP) created in heavy-ion collisions. However, a precise understanding of the jet-medium interaction is still lacking, and the development of more sophisticated observables is needed. This work presents a tool that allows for the exploration of alternative high- $p_{T}$ observables in a variety of collision systems. The tool builds on the publicly available JEWEL Monte Carlo code, and allows for the evolution of a jet on any given (2+1)-dimensional background. Proof-of-concept observables are also presented, studied using the latest version of JEWEL, JEWEL-2.4.0. The simplicity of the separation of the physics of the jet from the physics of the medium (while still allowing for the usual JEWEL medium-response), allows for easy interpretation without the need for complex parameterization. Results are produced using the RIVET toolkit, which allows for transparent preservation and development of analyses that are compatible with experimental methods. The code and analysis used to produce the plots presented here are made publicly available on a Github repository, with up-to-date usage instructions. This tool is expected to be useful to the broad jet-physics community for the study of precision observables for jets.
↳ nucl-thhep-ph14 citations
27*
First Direct Observation of Collider Neutrinos with FASER at the LHC
FASER Collaboration: Henso Abreu🇮🇱 · John Anders🇨🇭 · Claire Antel🇨🇭 · Akitaka Ariga🇨🇭 · Tomoko Ariga🇯🇵 · Jeremy Atkinson🇨🇭 · Florian U. Bernlochner🇩🇪 · Tobias Blesgen🇩🇪 · Tobias Boeckh🇩🇪 · Jamie Boyd🇨🇭 · Lydia Brenner🇳🇱 · Franck Cadoux🇨🇭 and 75 other authors
We report the first direct observation of neutrino interactions at a particle collider experiment. Neutrino candidate events are identified in a 13.6 TeV center-of-mass energy $pp$ collision data set of 35.4 fb $^{- 1}$ using the active electronic components of the FASER detector at the Large Hadron Collider. The candidates are required to have a track propagating through the entire length of the FASER detector and be consistent with a muon neutrino charged-current interaction. We infer $15 3_{- 13}^{+ 12}$ neutrino interactions with a significance of 16 standard deviations above the background-only hypothesis. These events are consistent with the characteristics expected from neutrino interactions in terms of secondary particle production and spatial distribution, and they imply the observation of both neutrinos and anti-neutrinos with an incident neutrino energy of significantly above 200 GeV.
↳ hep-exhep-phPRL(2023)·179 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.