Mon·Oct 17, 2022Monday·October 17, 2022

1. 01*

   Improving Colour Computations in MadGraph5_aMC@NLO and Exploring a 1/Nc Expansion

   Andrew Lifson🇸🇪 · Olivier Mattelaer🇧🇪

   In this paper, we present an extension of MadGraph5_aMC@NLO which is able to evaluate tree-level QCD matrix-elements up to $2\to 6$ (one more particle than before). To achieve this, we implemented Berends-Giele-like recursion, and re-implemented the way colour is computed such that we can now expand the colour matrix in powers of 1/Nc and truncate this expansion to a chosen order. For high multiplicity samples, even without truncating the colour matrix, the new implementation offers a speed gain compared to the previous MadGraph5_aMC@NLO code.

   hep-phEPJC(2022)·6 citations
2. 02*

   Study of worm-gear-T function $g_{1T}$ with semi-inclusive DIS data

   Malin Horstmann🇩🇪 · Andreas Schafer🇩🇪 · Alexey Vladimirov🇪🇸

   The worm-gear-T function parameterizes the probability to find a longitudinally polarized quark inside a transversely polarized hadron. We extract it from data on polarized semi-inclusive deep-inelastic scattering (SIDIS) measured at COMPASS and HERMES. As a theoretical model, we use a Wandzura-Wilczek-type approximation at the next-to-leading order. We find that, at present, the data quality is insufficient to determine the worm-gear-T function faithfully. We also provide predictions for the transverse single-spin asymmetry associated with the worm-gear-T function, which could be measured in weak-boson production at STAR.

   hep-phPRD(2023)·18 citations
3. 03*

   Dark matter - electron interactions in materials beyond the dark photon model

   Riccardo Catena🇸🇪 · Daniel Cole🇸🇪 · Timon Emken🇸🇪 · Marek Matas🇨🇭 · Nicola Spaldin🇨🇭 · Walter Tarantino🇨🇭 · Einar Urdshals🇸🇪

   The search for sub-GeV dark matter (DM) particles via electronic transitions in underground detectors attracted much theoretical and experimental interest in the past few years. A still open question in this field is whether experimental results can in general be interpreted in a framework where the response of detector materials to an external DM probe is described by a single ionisation or crystal form factor, as expected for the so-called dark photon model. Here, ionisation and crystal form factors are examples of material response functions: interaction-specific integrals of the initial and final state electron wave functions. In this work, we address this question through a systematic classification of the material response functions induced by a wide range of models for spin-0, spin-1/2 and spin-1 DM. We find several examples for which an accurate description of the electronic transition rate at DM direct detection experiments requires material response functions that go beyond those expected for the dark photon model. This concretely illustrates the limitations of a framework that is entirely based on the standard ionisation and crystal form factors, and points towards the need for the general response-function-based formalism we pushed forward recently [1,2]. For the models that require non-standard atomic and crystal response functions, we use the response functions of [1,2] to calculate the DM-induced electronic transition rate in atomic and crystal detectors, and to present 90% confidence level exclusion limits on the strength of the DM-electron interaction from the null results reported by XENON10, XENON1T, EDELWEISS and SENSEI.

   hep-phastro-ph.COJCAP(2023)·36 citations
4. 04*

   Bayesian inference to study a signal with two or more decaying particles in a non-resonant background

   Ezequiel Alvarez (ICAS, Argentina)🇦🇷

   We study the application of a Bayesian method to extract relevant information from data for the case of a signal consisting of two or more decaying particles and its background. The method takes advantage of the dependence that exists in the distributions of the decaying products at the event-by-event level and processes the information for the whole sample to infer the mixture fraction and the relevant parameters for signal and background distributions. The algorithm usually needs a numerical computation of the posterior, which we work out explicitly in a benchmark scenario of a simplified $pp\to hh\to b\bar{b}\gamma \gamma$ search. We perform a posterior predictive check on the results and we show how the signal fraction is correctly extracted from the sample, as well as many parameters in the signal and background distributions. The presented framework could be used for other searches such as $pp\to ZZ,WW,ZW$ and pair of Leptoquarks, among many others.

   hep-phhep-ex8 citations
5. 05*

   Field Theory Approaches to Relativistic Hydrodynamics

   Nahuel Mirón Granese🇦🇷 · Alejandra Kandus🇧🇷 · Esteban Calzetta🇦🇷

   Just as non relativistic fluids, oftentimes we find relativistic fluids in situations where random fluctuations cannot be ignored, thermal and turbulent fluctuations being the most relevant examples. Because of the theory's inherent nonlinearity, fluctuations induce deep and complex changes in the dynamics of the system. The Martin-Siggia-Rose technique is a powerful tool that allows us to translate the original hydrodynamic problem into a quantum field theory one, thus taking advantage of the progress in the treatment of quantum fields out of equilibrium. To demonstrate this technique, we shall consider the thermal fluctuations of the spin two modes of a relativistic fluid, in a theory where hydrodynamics is derived by taking moments of the Boltzmann equation under the relaxation time approximation.

   hep-phEntropy(2022)·8 citations
6. 06*

   Schwinger-Dyson truncations in the all-soft limit: a case study

   A. C. Aguilar🇧🇷 · M. N. Ferreira🇪🇸 · B. M. Oliveira🇧🇷 · J. Papavassiliou🇪🇸

   We study a special Schwinger-Dyson equation in the context of a pure SU(3) Yang-Mills theory, formulated in the background field method. Specifically, we consider the corresponding equation for the vertex that governs the interaction of two background gluons with a ghost-antighost pair. By virtue of the background gauge invariance, this vertex satisfies a naive Slavnov-Taylor identity, which is not deformed by the ghost sector of the theory. In the all-soft limit, where all momenta vanish, the form of this vertex may be obtained exactly from the corresponding Ward identity. This special result is subsequently reproduced at the level of the Schwinger-Dyson equation, by making extensive use of Taylor's theorem and exploiting a plethora of key relations, particular to the background field method. This information permits the determination of the error associated with two distinct truncation schemes, where the potential advantage from employing lattice data for the ghost dressing function is quantitatively assessed.

   hep-phhep-lathep-thnucl-thEPJC(2022)·6 citations
7. 07*

   On the quark spectral function in QCD

   Jan Horak🇩🇪 · Jan M. Pawlowski🇩🇪 · Nicolas Wink🇩🇪

   We calculate the spectral function of light quark flavours in 2+1 flavour vacuum QCD in the isospin-symmetric approximation. We employ spectral Dyson-Schwinger equations and compute the non-perturbative quark propagator directly in real-time, using recent spectral reconstruction results from Gaussian process regression of gluon propagator data in 2+1 flavour lattice QCD. Our results feature a pole-like peak structure at time-like momenta larger than the propagator's gapping scale as well as a negative scattering continuum, which we exploit assuming an analytic pole-tail split during the iterative solution. The computation is augmented with a general discussion of the impact of the quark-gluon vertex and the gluon propagator on the analytic structure of the quark propagator. In particular, we investigate under which conditions the quark propagator shows unphysical complex poles. Our results offer a wide range of applications, encompassing the ab-initio calculation of transport as well as resonance properties in QCD.

   hep-phhep-lathep-thSciPost Phys.(2023)·34 citations
8. 08*

   Calculation of branching fraction and $CP$ violation in $B^{-}\to D_s^{-}{D}^0$ decay

   Behnam Mohammadi🇮🇷 · Elnaz Amirkhanlou🇮🇷

   The most precise measurement of the $CP$ asymmetry in the decay $B^{-}\to D_s^{-}{D}^0$ has been reported by LHCb collaboration with the value of $(-0.4\pm 0.5\pm 0.5)\%$. In this study, the $CP$ violation in the decay $B^{-}\to D_s^{-}{D}^0$ has been calculated under the factorization approach. This decay mode includes current-current tree and penguin diagrams and their amplitudes are considered separately. In each of the tree and penguin amplitudes, the strong and weak phases have been introduced. The $CP$ asymmetry has been calculated in this work to be $(-0.35\pm 0.03)\%$. Finally, from the sum of the amplitudes, we have calculated the total amplitude and obtained comparable results with experimental value for the branching ratio of $B^{-}\to D_s^{-}{D}^0$ decay.

   hep-phActa Phys.Polon.B(2022)·0 citations
9. 09*

   Dark matter in the Scotogenic model with spontaneous lepton number violation

   Valentina De Romeri🇪🇸 · Jacopo Nava🇪🇸 · Miguel Puerta🇪🇸 · Avelino Vicente🇪🇸

   Scotogenic models constitute an appealing solution to the generation of neutrino masses and to the dark matter mystery. In this work we consider a version of the Scotogenic model that breaks lepton number spontaneously. At this scope, we extend the particle content of the Scotogenic model with an additional singlet scalar which acquires a non-zero vacuum expectation value and breaks a global lepton number symmetry. As a consequence, a massless Goldstone boson, the majoron, appears in the particle spectrum. We discuss how the presence of the majoron modifies the phenomenology, both in flavor and dark matter observables. We focus on the fermionic dark matter candidate and analyze its relic abundance and prospects for both direct and indirect detection.

   hep-phPRD(2023)·24 citations
10. 10*

    Bethe-Salpeter Bound-State Solutions: Examining Semirelativistic Approaches

    Wolfgang Lucha🇦🇹

    Within the formalism of relativistic quantum field theory an adequate framework for the description of two-particle bound states, such as, for instance, all conventional (i.e., non-exotic) mesons, is provided by the Poincaré-covariant homogeneous Bethe-Salpeter equation. In applications, however, this approach usually proves to be rather involved, whence it is not always quite easy to extract the predictions sought. In view of this, a coarse idea of the bound-state spectrum to be expected might be gained by adhering to some simplifying approximations - which constitutes an entirely legitimate first step. The reliability of the insights inferred from the arising simpler bound-state equation may be straightforwardly examined by taking into account a couple of rigorous constraints on the obtained discrete spectrum. Application of these tools is illustrated for popular potentials.

    hep-phhep-thnucl-thquant-phEPJ Web Conf.(2022)·0 citations
11. 11*

    Statistical significances and projections for proton decay experiments

    Prudhvi N. Bhattiprolu🇺🇸 · Stephen P. Martin🇺🇸 · James D. Wells🇺🇸

    We study the statistical significances for exclusion and discovery of proton decay at current and future neutrino detectors. Various counterintuitive flaws associated with frequentist and modified frequentist statistical measures of significance for multi-channel counting experiments are discussed in a general context and illustrated with examples. We argue in favor of conservative Bayesian-motivated statistical measures, and as an application we employ these measures to obtain the current lower limits on proton partial lifetime at various confidence levels, based on Super-Kamiokande's data, generalizing the 90\% CL published limits. Finally, we present projections for exclusion and discovery reaches for proton partial lifetimes in $p\to \overline{\nu }{K}^{+}$ and $p\to e^{+}{\pi }^0$ decay channels at Hyper-Kamiokande, DUNE, JUNO, and THEIA.

    hep-phPRD(2023)·10 citations
12. 12*

    Probing Freeze-in Dark Matter via Heavy Neutrino Portal

    Basabendu Barman🇨🇴 · P. S. Bhupal Dev🇺🇸 · Anish Ghoshal🇵🇱

    We explore the possibility of probing freeze-in dark matter (DM) produced via the right-handed neutrino (RHN) portal using the RHN search experiments. We focus on a simplified framework of minimally-extended type-I seesaw model consisting of only four free parameters, namely the RHN mass, the fermionic DM mass, the Yukawa coupling between the DM and the RHN, and a real singlet scalar mass. We consider two cases for the DM production either via decay of the thermal RHN or via scattering of the bath particles mediated by the RHN. In both cases, we show that for sub-TeV scale DM masses, the allowed model parameter space satisfying the observed DM relic density for freeze-in scenario falls within the reach of current and future collider, beam dump and forward physics facilities looking for feebly-coupled heavy neutrinos.

    hep-phastro-ph.COPRD(2023)·23 citations
13. 13*

    Higgs boson production in association with a top-antitop quark pair in next-to-next-to leading order QCD

    Stefano Catani🇮🇹 · Simone Devoto🇮🇹 · Massimiliano Grazzini🇨🇭 · Stefan Kallweit🇮🇹 · Javier Mazzitelli🇨🇭 · Chiara Savoini🇨🇭

    The associated production of a Higgs boson with a top-antitop quark pair is a crucial process at the LHC since it allows for a direct measurement of the top-quark Yukawa coupling. We present the computation of the radiative corrections to this process at the next-to-next-to-leading order (NNLO) in QCD perturbation theory. This is the very first computation for a $2\to 3$ process with massive coloured particles at this perturbative order. We develop a soft Higgs boson approximation for loop amplitudes, which enables us to reliably quantify the impact of the yet unknown two-loop contribution. At the centre-of-mass energy $\sqrt{s}=13$ TeV the NNLO corrections increase the next-to-leading order result for the total cross section by about 4% and lead to a significant reduction of perturbative uncertainties.

    hep-phhep-exPRL(2023)·94 citations
14. 14*

    Pushing forward jet substructure measurements in heavy-ion collisions

    Daniel Pablos🇮🇹 · Alba Soto-Ontoso🇫🇷

    Energetic jets that traverse the quark-gluon plasma created in heavy-ion collisions serve as excellent probes to study this new state of deconfined QCD matter. Presently, however, our ability to achieve a crisp theoretical interpretation of the crescent number of jet observables measured in experiments is hampered by the presence of selection biases. The aim of this work is to minimise those selection biases associated to the modification of the quark- vs. gluon-initiated jet fraction in order to assess the presence of other medium-induced effects, namely color decoherence, by exploring the rapidity dependence of jet substructure observables. So far, all jet substructure measurements at mid-rapidity have shown that heavy-ion jets are narrower than vacuum jets. We show both analytically and with Monte Carlo simulations that if the narrowing effect persists at forward rapidities, where the quark-initiated jet fraction is greatly increased, this could serve as an unambiguous experimental observation of color decoherence dynamics in heavy-ion collisions.

    hep-phhep-exnucl-exnucl-thPRD(2023)·30 citations
15. 15*

    Single diffractive hard exclusive processes for the study of generalized parton distributions

    Jian-Wei Qiu🇺🇸 · Zhite Yu🇺🇸

    Generalized parton distributions (GPDs) are important nonperturbative functions that provide tomographic images of partonic structures of hadrons. We introduce a type of exclusive processes, to be referred to as single diffractive hard exclusive processes (SDHEPs). We discuss the necessary and sufficient conditions for SDHEPs to be factorized into GPDs. We demonstrate that the SDHEP is not only sufficiently generic to cover all known processes for extracting GPDs, but is also well motivated for the search of new processes for the study of GPDs. We examine the sensitivity of the SDHEP to the parton momentum fraction $x$ dependence of GPDs.

    hep-phhep-exnucl-exnucl-thPRD(2023)·82 citations
16. 16*

    Geometry in Scattering Amplitudes

    Andreas Helset🇺🇸 · Elizabeth E. Jenkins🇺🇸 · Aneesh V. Manohar🇺🇸

    We formulate the field-space geometry for an effective field theory of scalars and gauge bosons. Geometric invariants such as the field-space curvature enter in both scattering amplitudes and the renormalization group equations, with the scalar and gauge results unified in a single expression.

    hep-phhep-thPRD(2022)·42 citations
17. 17*

    More Ingredients for an Altarelli Cocktail at MiniBooNE

    Kevin J. Kelly🇨🇭 · Joachim Kopp🇨🇭

    The MiniBooNE excess persists as a significant puzzle in particle physics. Given that the MiniBooNE detector cannot discriminate between electron-like signals and backgrounds due to photons, the goal of this work is to study photon backgrounds in MiniBooNE in depth. We first consider a novel single-photon background arising from multi-nucleon scattering with coherently enhanced initial or final state radiation. This class of processes, which we dub "2p2h$\gamma$" (two-particle--two-hole + photon) can explain $\sim 40$ of the $\sim 560$ excess events observed by MiniBooNE in neutrino mode. Second, we consider the background from neutral-current single-${\pi }^0$ production, where two photons from ${\pi }^0\to \gamma \gamma$ decay are mis-identified as an electron-like shower. We construct a phenomenological likelihood that reproduces MiniBooNE's ${\pi }^0\to \gamma \gamma$ background faithfully. Even with data-driven background estimation techniques, we find there is a residual dependence on the Monte Carlo generator used. Our results motivate a reduction in the significance of the MiniBooNE excess by $0.4\sigma$.

    hep-phhep-exJHEP(2023)·11 citations
18. 18*

    BFSS Matrix Model Cosmology: Progress and Challenges

    Suddhasattwa Brahma🇬🇧 · Robert Brandenberger🇨🇦 · Samuel Laliberte🇨🇦

    We review a proposal to obtain an emergent metric space-time and an emergent early universe cosmology from the BFSS matrix model. Some challenges and directions for future research are outlined.

    ↳ hep-thastro-ph.COgr-qchep-phMDPI Physics(2023)·24 citations
19. 19*

    Entanglement-enhanced optomechanical sensor array for dark matter searches

    Anthony J. Brady🇺🇸 · Xin Chen🇺🇸 · Kewen Xiao🇺🇸 · Yi Xia🇺🇸 · Jack Manley🇺🇸 · Mitul Dey Chowdhury🇺🇸 · Zhen Liu🇺🇸 · Roni Harnik🇺🇸 · Dalziel J. Wilson🇺🇸 · Zheshen Zhang🇺🇸 · Quntao Zhuang🇺🇸

    The nature of dark matter is one of the most important open questions in modern physics. The search for dark matter is challenging since, besides gravitational interaction, it feebly interacts with ordinary matter. Mechanical sensors are one of the leading candidates for dark matter searches in the low frequency region. Here, we propose entanglement-enhanced optomechanical sensing systems to assist the search for DM with mechanical sensing devices. To assess the performance of our setup, we adopt the integrated sensitivity, which is particularly suitable for broadband sensing as it precisely quantifies the bandwidth-sensitivity tradeoff of the system. We then show that, by coherently operating the optomechanical sensor array and utilizing continuous-variable multi-partite entanglement between the optical fields, the array of sensors has a scaling advantage over independent sensors (i.e., $\sqrt{M}\to M$, where $M$ is the number of sensors) as well as a performance boost due to entanglement. Such an advantage is robust to imhomogeneities of the mechanical sensors and is achievable with off-the-shelf experimental components.

    ↳ quant-phhep-phCommun.Phys.(2023)·50 citations
20. 20*

    Light-nuclei production in heavy-ion collisions within a thermodynamical approach

    M. Kozhevnikova🇷🇺 · Yu. B. Ivanov🇷🇺

    We present results of simulations of light-nuclei production in relativistic heavy-ion collisions within updated Three-fluid Hydrodynamics-based Event Simulator Extended by UrQMD (Ultra-relativistic Quantum Molecular Dynamics) final State interactions (THESEUS). The simulations were performed for Pb+Pb and Au+Au collisions in the collision energy range of $\sqrt{s_{NN}}=$ 6.4--19.6 GeV. The light-nuclei production is treated within the thermodynamical approach on equal basis with hadrons. The only additional parameter related to the light nuclei is the energy density of late freeze-out that imitates afterburner stage of the collision because the light nuclei do not participate in the UrQMD evolution. This parameter is fixed from the condition of the best reproduction of the proton transverse-momentum spectrum after the UrQMD afterburner by that at the late freeze-out. The updated THESEUS results in not perfect, but a reasonable reproduction of data on bulk observables of the light nuclei, especially their functional dependence on the collision energy and light-nucleus mass. Various ratios, $d/p$, $t/p$, $t/d$, and $N(t)\times N(p)/N^2(d)$, are also considered. The directed flow of light nuclei turns out to be more involved. Apparently, it requires explicit treatment of the afterburner evolution of light nuclei that violates the kinetic equilibrium. Imperfect reproduction of the light-nuclei data leaves room for medium effects in produced light nuclei.

    ↳ nucl-thhep-phPRC(2023)·5 citations
21. 21*

    Gravitational focusing effects on streaming dark matter as a new detection concept

    Abaz Kryemadhi🇺🇸 · Marios Maroudas🇬🇷 · Andreas Mastronikolis🇬🇧 · Konstantin Zioutas🇬🇷

    Cosmological simulations for cold dark matter (DM) indicate that a large number of streams might exist in our Galaxy. The present work incorporates gravitational focusing (GF) effects on streaming DM constituents by the Sun and the Earth preceding their encounter with Earth bound detectors. For streaming DM, the GF gives rise to spatiotemporal flux enhancements of orders of magnitude above the nominal DM density. Remarkably, due to Earth's rotation the derived flux enhancements appear as transient signals lasting about 10 seconds repeating daily for days or weeks. This work presents a novel opportunity for DM signal detection and identification, and the present simulation can be applied to any kind of invisible matter entering the solar system.

    ↳ astro-ph.IMastro-ph.COastro-ph.EPgr-qc+1PRD(2023)·21 citations
22. 22*

    Sub-TeV hadronic interaction model differences and their impact on air showers

    M. Schmelling🇩🇪 · Á. Pastor-Gutiérrez🇩🇪 · H. Schorlemmer🇩🇪 · R. D. Parsons🇩🇪

    In the sub-TeV regime, the most widely used hadronic interaction models disagree significantly in their predictions of particle spectra from cosmic ray induced air showers. We investigate the nature and impact of model uncertainties, focussing on air shower primaries with energies around the transition between high and low energy hadronic interaction models, where the dissimilarities are largest and which constitute the bulk of the interactions in air showers.

    ↳ astro-ph.HEhep-exhep-phSciPost Phys.Proc.(2024)·0 citations
23. 23*

    Effective field theory and inelastic dark matter results from XENON1T

    E. Aprile🇺🇸 · K. Abe🇯🇵 · F. Agostini🇮🇹 · S. Ahmed Maouloud🇫🇷 · L. Althueser🇩🇪 · B. Andrieu🇫🇷 · E. Angelino🇮🇹 · J. R. Angevaare🇳🇱 · V. C. Antochi🇸🇪 · D. Antón Martin🇺🇸 · F. Arneodo🇦🇪 · L. Baudis🇨🇭 and 148 other authors

    In this work, we expand on the XENON1T nuclear recoil searches to study the individual signals of dark matter interactions from operators up to dimension-eight in a Chiral Effective Field Theory (ChEFT) and a model of inelastic dark matter (iDM). We analyze data from two science runs of the XENON1T detector totaling 1\,tonne$\times$year exposure. For these analyses, we extended the region of interest from [4.9, 40.9]keV${}_{\text{NR}}$ to [4.9, 54.4]keV${}_{\text{NR}}$ to enhance our sensitivity for signals that peak at nonzero energies. We show that the data is consistent with the background-only hypothesis, with a small background over-fluctuation observed peaking between 20 and 50keV${}_{\text{NR}}$, resulting in a maximum local discovery significance of 1.7\,$\sigma$ for the Vector$\otimes$Vector${}_{\text{strange}}$ ($V{V}_s$) ChEFT channel for a dark matter particle of 70GeV/c${}^2$, and $1.8\sigma$ for an iDM particle of 50GeV/c${}^2$ with a mass splitting of 100keV/c${}^2$. For each model, we report 90\,\% confidence level (CL) upper limits. We also report upper limits on three benchmark models of dark matter interaction using ChEFT where we investigate the effect of isospin-breaking interactions. We observe rate-driven cancellations in regions of the isospin-breaking couplings, leading to up to 6 orders of magnitude weaker upper limits with respect to the isospin-conserving case.

    ↳ hep-exhep-phPRD(2024)·22 citations
24. 24*

    Towards glueball masses of large-$N\mathrm{SU}(N)$ Yang-Mills theories without topological freezing via parallel tempering on boundary conditions

    Claudio Bonanno🇮🇹 · Massimo D'Elia🇮🇹 · Biagio Lucini🇬🇧 · Davide Vadacchino🇬🇧

    Standard local updating algorithms experience a critical slowing down close to the continuum limit, which is particularly severe for topological observables. In practice, the Markov chain tends to remain trapped in a fixed topological sector. This problem further worsens at large $N$, and is known as $topologicalfreezing$. To mitigate it, we adopt the parallel tempering on boundary conditions proposed by M. Hasenbusch. This algorithm allows to obtain a reduction of the auto-correlation time of the topological charge up to several orders of magnitude. With this strategy we are able to provide the first computation of low-lying glueball masses at large $N$ free of any systematics related to topological freezing.

    ↳ hep-lathep-phhep-thPoS(2023)·7 citations
25. 25*

    Thermal Transitions in Dense Two-Colour QCD

    Dale Lawlor🇮🇪 · Simon Hands🇬🇧 · Seyong Kim🇰🇷 · Jon-Ivar Skullerud🇮🇪

    The infamous sign problem makes it impossible to probe dense (baryon density ${\mu }_B>0$) QCD at temperatures near or below the deconfinement threshold. As a workaround, one can explore QCD-like theories such as two-colour QCD (QC2D) which don't suffer from this sign problem but are qualitively similar to real QCD. Previous studies on smaller lattice volumes have investigated deconfinement and colour superfluid to normal matter transitions. In this study we look at a larger lattice volume $N_s=24$ in an attempt to disentangle finite volume and finite temperature effects. We also fit to a larger number of diquark sources to better allow for extrapolation to zero diquark source.

    ↳ hep-lathep-phnucl-thEPJ Web Conf.(2022)·3 citations
26. 26*

    A stabilizing kernel for complex Langevin simulations of real-time gauge theories

    Kirill Boguslavski🇦🇹 · Paul Hotzy🇦🇹 · David I. Müller🇦🇹

    The complex Langevin (CL) method is a promising approach to overcome the sign problem, which emerges in real-time formulations of quantum field theories. Over the past decade, stabilization techniques for CL have been developed with important applications in finite density QCD. However, they are insufficient for SU($N_c$) gauge theories on a Schwinger-Keldysh time contour that is required for a real-time formulation. In these proceedings we revise the discretization of the real-time CL equations and introduce a novel anisotropic kernel that enables CL simulations on discretized time contours. Applying it to SU(2) Yang-Mills theory in 3+1 dimensions, we obtain unprecedentedly stable results that may allow us to calculate real-time observables from first principles.

    ↳ hep-lathep-phPoS(2023)·5 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.