Mon·May 10, 2021Monday·May 10, 2021

1. 01*

   Phenomenology of Minimal Leptophilic Dark Matter Models at Linear Colliders

   Adil Jueid🇰🇷 · Salah Nasri🇦🇪

   We discuss the phenomenology of a minimal model for GeV-scale Majorana dark matter (DM) coupled to the standard model lepton sector via a charged scalar singlet. The theoretical framework extends the Standard Model by two $SU(2{)}_L$ singlets: one charged Higgs boson and a singlet right-handed fermion. The latter plays the role of the DM candidate. We show that there is an anti-correlation between the spin-independent DM-Nucleus scattering cross-section (${\sigma }_{\mathrm{SI}}$) and the DM relic density. We suggest a scenario that can be tested in both electron-electron and electron-positron collisions using the production of same-sign charged Higgs pairs and mono-Higgs in association with right-handed neutrinos.

   hep-phhep-ex1 citation
2. 02*

   Mass spectra and transition magnetic moments of low lying charmed baryons in a quark model

   Zahra Ghalenovi🇮🇷 · Masoumeh Moazzen Sorkhi🇮🇷

   Excited state mass spectra of the low lying single charmed baryons with non strangeness have been calculated in a hypercentral approach. The six-dimensional hyperradial Schrödinger equation is solved by applying a simple variational method. We extend our scheme to predict the magnetic moments and the ${\frac{3}{2}}^{+}\to {\frac{1}{2}}^{+}$ transition magnetic moments of ${\Sigma }_c$ and ${\Lambda }_c$ state baryons. A comparison of our results with the experimental data and predictions obtained in recent models is also presented.

   hep-phnucl-thIJMPE(2021)·2 citations
3. 03*

   Standard Model prediction of the $B_c$ lifetime

   Jason Aebischer🇺🇸 · Benjamín Grinstein🇺🇸

   Applying an operator product expansion approach we update the Standard Model prediction of the $B_c$ lifetime from over 20 years ago. The non-perturbative velocity expansion is carried out up to third order in the relative velocity of the heavy quarks. The scheme dependence is studied using three different mass schemes for the $\bar{b}$ and $c$ quarks, resulting in three different values consistent with each other and with experiment. Special focus has been laid on renormalon cancellation in the computation. Uncertainties resulting from scale dependence, neglecting the strange quark mass, non-perturbative matrix elements and parametric uncertainties are discussed in detail. The resulting uncertainties are still rather large compared to the experimental ones, and therefore do not allow for clear-cut conclusions concerning New Physics effects in the $B_c$ decay.

   hep-phJHEP(2021)·52 citations
4. 04*

   Schwinger pair production in inhomogeneous electric fields with symmetrical frequency chirp

   Melike Mohamedsedik🇨🇳 · Lie-Juan Li🇨🇳 · B. S. Xie🇨🇳

   Pair production in inhomogeneous electric fields with symmetrical frequency chirp is studied numerically using the Dirac-Heisenberg-Wigner formalism. We investigate high- and low-frequency modes and consider two carrier envelope phases. Momentum spectrum is sensitive to chirp causing different interference effect for different spatial scales as well as the carrier phase of the external field. The reduced particle number is in general enhanced with increasing chirp. The effect of spatial scale of the field on the reduced particle number is also examined. It is found that it is enhanced at small spatial scale but is almost unchangeable at large spatial scales for the considered field parameters. On the other hand, at small spatial scale, the reduced particle number is enhanced by one or two orders when chirp is applied with the exception of cosine low-frequency field which is only a few times larger. Moreover it is found that the reduced particle number is further increased by symmetrical chirp at about two times by comparing to the usual asymmetrical chirp in high frequency field.

   hep-phPRD(2021)·29 citations
5. 05*

   Partial wave analysis of $K^{+}N$ scattering and the possibility of pentaquark ${\Theta }^{+}(1540)$

   Kook-Jin Kong🇰🇷 · Byung-Geel Yu🇰🇷

   Elastic $K^{+}n\to K^{+}n$ and charge exchange $K^{+}n\to K^{0}p$ reactions at low momenta are investigated using the partial wave analysis. Isospin relation gives constrains for the partial $s$- and $p$-waves among elastic $K^{+}p$, $K^{+}n$ and charge exchange $K^{+}n\to K^{0}p$ amplitudes. Two sets of the phase shift for these partial waves in the isoscalar channel are obtained from the fit of experimental data on total and differential cross sections. Polarization observable leads to a good criterion to decide which set is valid. Differential cross section data near $P_{\mathrm{Lab}}=434$ MeV/$c$ suggests a possibility of a resonance, e.g., the exotic ${\Theta }^{+}(1540)$ baryon around $\sqrt{s}\simeq$ 1.54GeV.

   hep-phnucl-thFew Body Syst.(2021)·2 citations
6. 06*

   Scalar Mesons and Axial-vector Mesons Via Dyson-Schwinger Equation and Bethe-Salpeter Equation Approach

   Muyang Chen🇨🇳

   In this work, I studied the spectrum of scalar mesons and axial-vector mesons via Dyson-Schwinger equation and Bethe-Salpeter equation approach in the rainbow-ladder approximation. An interaction model with a repulsive term added to the one used for the pseudoscalar and vector mesons is proposed. My results are consistent with the experiment data and other model results, which shows that this interaction model is effective for all the heavy, heavy-light, and light scalar and axial-vector mesons.

   hep-phnucl-th1 citation
7. 07*

   Group Theory Analysis of $P_c$ Resonances in Molecular Picture

   Kanokphon Phumphan🇹🇭 · Kai Xu🇹🇭 · Wiriya Ruangyoo🇹🇭 · Chia-Chu Chen🇹🇼 · Ayut Limphirat🇹🇭 · Yupeng Yan🇹🇭

   Hidden-charm pentaquarks are analysed in Group Theory in the baryon-meson molecule picture within the framework of the constituent quark model. The investigation of strong decays of pentaquark resonances reveals that pentaquark states of all quark configurations can decay through the $NJ/\psi$ channel while only five pentaquark states may decay in open-charm modes. The partial decay widths in the $p{\eta }_c$ channel are in the same order as in the $pJ/\psi$ channel for $J^P=1/2^{-}$ baryon-meson pentaquark states, but the $p{\eta }_c$ channel is forbidden for $J^P=3/2^{-}$ states. The $p{\eta }_c$, ${\Sigma }_c\bar{D}$ and ${\Lambda }_c^{+}\bar{D}$ channels open for $J^P=1/2^{-}$ $P_c(4440)$ and $P_c(4457)$ while the ${\Sigma }_c^{\ast }\bar{D}$ channel opens for $J^P=3/2^{-}$ $P_c(4440)$ and $P_c(4457)$. For $P_c(4312)$, due to the mass threshold of ${\Sigma }_c\bar{D}$ and ${\Sigma }_c^{\ast }\bar{D}$ higher than 4312 MeV, the $p{\eta }_c$ and ${\Lambda }_c^{+}\bar{D}$ channels are open for $J^P=1/2^{-}$ but no open-charm channel open for $J^P=3/2^{-}$. We strongly suggest that the spin of the $P_c$ resonances may be determined in experiments by investigating the $p{\eta }_c$ and open-charm channels.

   hep-ph13 citations
8. 08*

   GAMBIT: The Global and Modular BSM Inference Tool

   Tomas E. Gonzalo🇦🇺

   In this conference paper I present GAMBIT , the Global and Modular BSM Inference Tool. I describe the various components of GAMBIT , its modules and interfaces to external tools, as well as a brief summary of the most recent results. In addition I introduce for the first time GUM , the GAMBIT Universal Model Machine, a tool created to auto-generate GAMBIT code for any BSM model from the most popular Lagrangian-level tools, FeynRules and SARAH.

   hep-phPoS(2021)·3 citations
9. 09*

   Isospin asymmetry in holographic baryonic matter

   Nicolas Kovensky🇫🇷 · Andreas Schmitt🇬🇧

   We study baryonic matter with isospin asymmetry, including fully dynamically its interplay with pion condensation. To this end, we employ the holographic Witten-Sakai-Sugimoto model and the so-called homogeneous ansatz for the gauge fields in the bulk to describe baryonic matter. Within the confined geometry and restricting ourselves to the chiral limit, we map out the phase structure in the presence of baryon and isospin chemical potentials, showing that for sufficiently large chemical potentials condensed pions and isospin-asymmetric baryonic matter coexist. We also present first results of the same approach in the deconfined geometry and demonstrate that this case, albeit technically more involved, is better suited for comparisons with and predictions for real-world QCD. Our study lays the ground for future improved holographic studies aiming towards a realistic description of charge neutral, beta-equilibrated matter in compact stars, and also for more refined comparisons with lattice studies at nonzero isospin chemical potential.

   hep-phhep-thnucl-thSciPost Phys.(2021)·35 citations
10. 10*

    Some Recent Developments in 5th Force Searches

    Ephraim Fischbach🇺🇸 · Dennis E. Krause🇺🇸 · Megan H. McDuffie🇺🇸 · Michael J. Mueterthies🇺🇸

    Recently we drew attention to the fact that most recent 5th force searches and tests of the weak equivalence principle (WEP) utilize only one or two pairs of test samples. We argue that, despite the great precision of these experiments, the lack of diversity of samples may mean they are unable to detect new composition-dependent forces, which requires the observation of a pattern in the data. Such a pattern was observed in the experiment by Eötvös, Pekár, and Fekete (EPF), the last high precision test of the WEP which used a significant number of different samples. We advocate for new experiments utilizing a sufficient number and range of samples to either confirm or refute the pattern found in the EPF experimental data.

    hep-phgr-qc1 citation
11. 11*

    On the Tau flavor of the cosmic neutrino flux

    Yasaman Farzan🇮🇷

    Observation of high energy cosmic neutrinos by ICECUBE has ushered in a new era in exploring both cosmos and new physics beyond the Standard Model (SM). In the standard picture, although mostly ${\nu }_{\mu }$ and ${\nu }_e$ are produced in the source, oscillation will produce ${\nu }_{\tau }$ {\it en route}. Certain beyond SM scenarios, like interaction with ultralight DM can alter this picture. Thus, the flavor composition of the cosmic neutrino flux can open up the possibility of exploring certain beyond the SM scenarios that are inaccessible otherwise. We show that the $\tau$ flavor holds a special place among the neutrino flavors in elucidating new physics. Interpreting the two anomalous events observed by ANITA as ${\nu }_{\tau }$ events makes the tau flavor even more intriguing. We study how the detection of the two tau events by ICECUBE constrains the interaction of the neutrinos with ultralight dark matter and discuss the implications of this interaction for even higher energy cosmic neutrinos detectable by future radio telescopes such as ARA, ARIANNA and GRAND. We also revisit the $3+1$ neutrino scheme as a solution to the two anomalous ANITA events and clarify a misconception that exists in the literature about the evolution of high energy neutrinos in matter within the $3+1$ scheme with a possibility of scattering off nuclei. We show that the existing bounds on the flux of ${\nu }_{\tau }$ with energy of EeV rules out this solution for the ANITA events. We show that the $3+1$ solution can be saved from both this bound and from the bound on the extra relativistic degrees of freedom in the early universe by turning on the interaction of neutrinos with ultralight dark matter.

    hep-phastro-ph.HEJHEP(2021)·12 citations
12. 12*

    Dalitz plot studies of $D^0\to K_S^0{K}^{+}{K}^{-}$ decays in a factorization approach

    J.-P.Dedonder🇫🇷 · R. Kamiński🇵🇱 · L. Leśniak🇵🇱 · B. Loiseau🇫🇷

    The $\text{BABAR}$ Collaboration data of the $D^0\to K_S^0{K}^{+}{K}^{-}$ process are analyzed within a quasi two-body factorization framework. In earlier studies, assuming $D^0$ transitions to two kaons and the transitions between one kaon and two kaons to proceed through the dominant intermediate resonances, we approximated them as being proportional to the kaon form factors. To obtain good fits, one has to multiply the scalar-kaon form factors, derived from unitary relativistic coupled-channel models or in a dispersion relation approach, by phenomenological energy-dependent functions. The final state kaon-kaon interactions in the $S$-, $P$- and $D$- waves are taken into account. All $S$-wave channels are treated in a unitary way. The $K^{+}{K}^{-}$ and ${\bar{K}}^0{K}^{+}$ $S$-wave effective mass squared distributions, corrected for phase space, are shown, in a model-independent manner, to be significantly different. Then the $f_0(980)$ resonance must be included at variance with the BABAR analysis. The best fit has 19 free parameters and indicates i) the dominance of annihilation amplitudes, ii) a large dominance of the $f_0(980)$ meson in the near threshold $K^{+}{K}^{-}$ invariant mass distribution and iii) a sizable branching fraction to the $K_S^0[\rho (770{)}^{+}+\rho (1450{)}^{+}+\rho (1700{)}^{+}]$ final states. An appendix provides an update of the determination of the isoscalar-scalar meson-meson amplitudes based on an enlarged set of data. A second appendix proposes two alternative fits based on scalar-kaon form factors calculated from the Muskhelishvili-Omnès dispersion relation approach. These fits have ${\chi }^2$ quite close to that of the best fit but they show important contributions from both the $f_0$ and $a_0^0$ mesons and a weaker role of the ${\rho }^{+}$ mesons.

    hep-phhep-exnucl-thPRD(2021)·14 citations
13. 13*

    Probing Top-philic New Physics via Four-Top-Quark Production

    Qing-Hong Cao🇨🇳 · Jun-Ning Fu🇨🇳 · Yandong Liu🇨🇳 · Xiao-Hu Wang🇨🇳 · Rui Zhang🇨🇳

    We explore constraints on various new physics resonances from four top-quark production based on current experimental data. Both light and heavy resonances are studied in the work. A comparison of full width effect and narrow width approximation is also made.

    hep-phCPC(2021)·13 citations
14. 14*

    Vector-like Leptons in Light of the Cabibbo-Angle Anomaly

    Claudio Andrea Manzari🇨🇭

    The first row of the Cabibbo-Cobayashi-Maskawa (CKM) matrix shows a discrepancy of $\sim$$3\sigma$ with unitarity, known as the "Cabibbo Angle Anomaly" (CAA). This tension can be explained via modified $W$ couplings to leptons, but in order to consistently assess the validity of this solution, a global fit including the electroweak (EW) precision constraints and the low energy tests of lepton flavour universality (LFU) is necessary. Performing such a fit for gauge-invariant dimension-6 operators, we find that even when assuming LFU, including the CKM elements $V_{us}$ and $V_{ud}$ into the electroweak fit has a relevant impact, shifting the best fit point significantly. Vector-like leptons (VLLs) are prime candidates for a corresponding UV completion since they can affect the $W$ and $Z$ couplings to leptons already at tree-level. Studying each pattern of new physics (NP) given by the six possible representations of VLLs (under the SM gauge group) we find that any single representation describes experimental data at most slighlty better than the SM hypothesis. However, allowing for several representations of VLLs at the same time, we find a simple scenario consisting of a singlet, $N$, coupling to electrons and a triplet, ${\Sigma }_1$, coupling to muons which not only explains the CAA but also improves the electroweak fit in such a way that its best fit point is preferred by more than $4\sigma$ with respect to the SM.

    hep-phhep-exnucl-exnucl-th7 citations
15. 15*

    Pseudo-Goldstone Dark Matter in $SO(10)$

    Nobuchika Okada🇺🇸 · Digesh Raut🇺🇸 · Qaisar Shafi🇺🇸 · Anil Thapa🇺🇸

    We propose a pseudo-Goldstone boson dark matter (pGDM) particle in $SO(10)$ grand unified theory (GUT). Due to its Goldstone nature, this pGDM evades the direct DM detection experiments which, otherwise, severely constrain the parameter space of DM models. In $SO(10)$, the pGDM is embedded as a linear combination of the Standard Model (SM) singlet scalars in $16_{\mathbf{H}}$ and $126_{\mathbf{H}}$ representations. We consider two scenarios for the intermediate route of $SO(10)$ symmetry breaking (SB) to the SM: $SU(5)\times U(1{)}_X$ and Pati-Salam the $SU(4{)}_c\times SU(2{)}_L\times SU(2{)}_R$ (4-2-2) gauge groups. The vacuum expectation value of $126_{\mathbf{H}}$, which triggers the breaking of $U(1{)}_X$ and 4-2-2 symmetry in the two scenarios, respectively, determines the pGDM lifetime whose astrophysical lower bound provides one of the most stringent constraints. For the 4-2-2 route to $SO(10)$, the successful SM gauge coupling unification requires the 4-2-2 breaking scale to be $\mathcal{O}(10^{11})$ GeV, and most of the parameter space is excluded. For the $SU(5)\times U(1{)}_X$ route, on the other hand, the $U(1{)}_X$ breaking scale can be significantly higher, and a wide range of the parameter space is allowed. Furthermore, the proton lifetime in the $SU(5)$ case is predicted to be $4.53\times 10^{34}$ years, which lies well within the sensitivity reach of the Hyper-Kamiokande experiment. We also examine the constraints on the model parameter space from the Large Hadron Collider and the indirect DM search by Fermi-LAT and MAGIC experiments.

    hep-phastro-ph.HEhep-thPRD(2021)·30 citations
16. 16*

    Cosmic Axion Force

    Dongok Kim🇰🇷 · Younggeun Kim🇰🇷 · Yannis K. Semertzidis🇰🇷 · Yun Chang Shin🇰🇷 · Wen Yin🇯🇵

    Nambu-Goldstone bosons, or axions, may be ubiquitous. Some of the axions may have small masses and thus serve as mediators of long-range forces. In this paper, we study the force mediated by an extremely light axion, $\varphi$, between the visible sector and the dark sector, where dark matter lives. Since nature does not preserve the CP symmetry, the coupling between dark matter and $\varphi$ is generically CP-violating. In this case, the induced force is extremely long-range and behaves as an effective magnetic field. If the force acts on electrons or nucleons, the spins of them on Earth precess around a fixed direction towards the galactic center. This provides an experimental opportunity for $\varphi$ with mass, $m_{\varphi }$, and decay constant, $f_{\varphi }$, satisfying $m_{\varphi }\lesssim 10^{-25}$ eV, $f_{\varphi }\lesssim 10^{14}$GeV if the daily modulation of the effective magnetic field signals in magnetometers is measured by using the coherent averaging method. The effective magnetic field induced by an axionic compact object, such as an axion domain wall, is also discussed.

    hep-phhep-exPRD(2021)·32 citations
17. 17*

    Flavour Physics with SuperIso

    S. Neshatpour🇫🇷 · F. Mahmoudi🇫🇷

    We describe SuperIso v4.1, a public code for calculation of flavour observables, in the Standard Model and for New Physics scenarios in a model-independent way as well as for specific beyond the SM models such as two Higgs doublet models (2HDM), minimal supersymmetric Standard Model (MSSM) and next-to-minimal supersymmetric Standard Model (NMSSM).

    hep-phPoS(2021)·30 citations
18. 18*

    Dark QCD Matters

    Raghuveer Garani🇮🇹 · Michele Redi🇮🇹 · Andrea Tesi🇮🇹

    We investigate the nightmare scenario of dark sectors that are made of non-abelian gauge theories with fermions, gravitationally coupled to the Standard Model (SM). While testing these scenarios is experimentally challenging, they are strongly motivated by the accidental stability of dark baryons and pions, that explain the cosmological stability of dark matter (DM). We study the production of these sectors which are minimally populated through gravitational freeze-in, leading to a dark sector temperature much lower than the SM, or through inflaton decay, or renormalizable interactions producing warmer DM. Despite having only gravitational couplings with the SM these scenarios turn out to be rather predictive depending roughly on three parameters: the dark sector temperature, the confinement scale and the dark pion mass. In particular, when the initial temperature is comparable to the SM one these scenarios are very constrained by structure formation, $\Delta N_{\mathrm{eff}}$ and limits on DM self-interactions. Dark sectors with same temperature or warmer than SM are typically excluded.

    hep-phJHEP(2021)·55 citations
19. 19*

    Living on the Fermi Edge: On Baryon Transport and Fermi Condensation

    Andreas Trautner🇩🇪

    The transfer function of the baryon power spectrum from redshift $z\approx 1100$ to today has recently been, for the first time, determined from data by Pardo and Spergel. We observe a remarkable coincidence between this function and the transport function of a cold ideal Fermi gas at different redshifts. Guided by this, we unveil an infinite set of critical temperatures of the relativistic ideal Fermi gas which depend on a very finely quantized long-distance cutoff. The sound horizon scale of Baryon Acoustic Oscillations (BAO) seems to set such a cutoff, which dials a critical temperature that is subsequently reached during redshift. At the critical point the Fermi gas becomes scale invariant and may condense to subsequently undergo gravitational collapse, seeding small scale structure. We mention some profound implications including the apparent quantization of Fermi momentum conjugate to the cutoff and the corresponding "gapping" of temperature.

    ↳ astro-ph.COcond-mat.quant-gasgr-qchep-phPLB(2022)·0 citations
20. 20*

    Flavor and CP from String Theory

    Hans Peter Nilles🇩🇪 · Saul Ramos-Sanchez🇲🇽 · Patrick K.S. Vaudrevange🇩🇪

    Modular transformations of string theory are shown to play a crucial role in the discussion of discrete flavor symmetries in the Standard Model. They include CP transformations and provide a unification of CP with traditional flavor symmetries within the framework of the "eclectic flavor" scheme. The unified flavor group is non-universal in moduli space and exhibits the phenomenon of "Local Flavor Unification", where different sectors of the theory (like quarks and leptons) can be subject to different flavor structures.

    ↳ hep-thhep-ph3 citations
21. 21*

    Comment on "Reproducibility and Replication of Experimental Particle Physics Results"

    Andrew Fowlie🇨🇳

    I would like to thank Junk and Lyons (arXiv:2009.06864) for beginning a discussion about replication in high-energy physics (HEP). Junk and Lyons ultimately argue that HEP learned its lessons the hard way through past failures and that other fields could learn from our procedures. They emphasize that experimental collaborations would risk their legacies were they to make a type-1 error in a search for new physics and outline the vigilance taken to avoid one, such as data blinding and a strict $5\sigma$ threshold. The discussion, however, ignores an elephant in the room: there are regularly anomalies in searches for new physics that result in substantial scientific activity but don't replicate with more data.

    ↳ physics.data-anhep-exhep-ph2 citations
22. 22*

    Fluctuations in the pasta phase

    Mateus R. Pelicer🇧🇷 · Débora P. Menezes🇧🇷 · Celso C. Barros Jr🇧🇷 · Francesca Gulminelli🇫🇷

    Baryonic matter close to the saturation density is very likely to present complex inhomogeneous structures collectively known under the name of pasta phase. At finite temperature, the different geometric structures are expected to coexist, with potential consequences on the neutron star crust conductivity and neutrino transport in supernova matter. In the framework of a statistical multi-component approach, we calculate the composition of matter in the pasta phase considering density, proton fraction, and geometry fluctuations. Using a realistic energy functional from relativistic mean field theory and a temperature and isospin dependent surface tension fitted from Thomas-Fermi calculations, we show that different geometries can coexist in a large fraction of the pasta phase, down to temperatures of the order of the crystallization temperature of the neutron star crust. Quantitative estimates of the charge fluctuations are given.

    ↳ nucl-thastro-ph.HEhep-phPRC(2021)·9 citations
23. 23*

    Searching for a subpopulation of primordial black holes in LIGO/Virgo gravitational-wave data

    Gabriele Franciolini🇨🇭 · Vishal Baibhav🇺🇸 · Valerio De Luca🇨🇭 · Ken K. Y. Ng🇺🇸 · Kaze W. K. Wong🇺🇸 · Emanuele Berti🇺🇸 · Paolo Pani🇮🇹 · Antonio Riotto🇨🇭 · Salvatore Vitale🇺🇸

    With several dozen binary black hole events detected by LIGO/Virgo to date and many more expected in the next few years, gravitational-wave astronomy is shifting from individual-event analyses to population studies. Using the GWTC-2 catalog, we perform a hierarchical Bayesian analysis that for the first time combines several state-of-the-art astrophysical formation models with a population of primordial black holes (PBHs) and constrains the fraction of a putative subpopulation of PBHs in the data. We find that this fraction depends significantly on the set of assumed astrophysical models. While a primordial population is statistically favored against certain competitive astrophysical channels, such as globular clusters and nuclear stellar clusters, a dominant contribution from the stable-mass-transfer isolated formation channel drastically reduces the need for PBHs, except for explaining the rate of mass-gap events like GW190521. The tantalizing possibility that black holes formed after inflation are contributing to LIGO/Virgo observations could only be verified by further reducing uncertainties in astrophysical and primordial formation models, and it may ultimately be confirmed by third-generation interferometers.

    ↳ gr-qcastro-ph.COastro-ph.HEhep-phPRD(2022)·245 citations
24. 24*

    A New de Sitter Solution with a Weakly Warped Deformed Conifold

    Bruno Valeixo Bento🇬🇧 · Dibya Chakraborty🇲🇽 · Susha L. Parameswaran🇬🇧 · Ivonne Zavala🇬🇧

    We revisit moduli stabilisation for type IIB flux compactifications that include a warped throat region corresponding to a warped deformed conifold, with an anti-D3-brane sitting at its tip. The warping induces a coupling between the conifold's deformation modulus and the bulk volume modulus in the Kähler potential. Previous works have studied the scalar potential assuming a strong warping such that this coupling term dominates, and found that the anti-D3-brane uplift may destabilise the conifold modulus and/or volume modulus, unless flux numbers within the throat are large, which makes tadpole cancellation a challenge. We explore the regime of parameter space corresponding to a weakly-but-still warped throat, such that the coupling between the conifold and volume moduli is subdominant. We thus discover a new metastable de Sitter solution within the four-dimensional effective field theory. We discuss the position of this de Sitter vacuum in the string theory landscape and swampland.

    ↳ hep-thastro-ph.COgr-qchep-phJHEP(2021)·35 citations
25. 25*

    Optimal observing strategies for velocity-suppressed dark matter annihilation

    Nolan Smyth🇺🇸 · Gabriela Huckabee🇺🇸 · Stefano Profumo🇺🇸

    Numerous particle models for the cosmological dark matter feature a pair-annihilation rate that scales with powers of the relative velocity between the annihilating particles. As a result, the annihilation rate in the central regions of a dark matter halo can be significantly lower than at the halo's periphery for particular ambient gravitational potentials. While this might be offset by an increasing dark matter pair number density in the inner halo, it raises the question: what angular region for dark matter models with velocity-suppressed annihilation rates optimizes signal-to-noise? Here, we consider simplified background models for galactic and extragalactic targets and demonstrate that the optimal observing strategy varies greatly case-by-case. Generally, a bright central source warrants an annular region of interest, while a flatter background warrants as large as possible an angular region, possibly including the central regions.

    ↳ astro-ph.COastro-ph.HEhep-phPRD(2021)·3 citations
26. 26*

    More Exact Results on Chiral Gauge Theories: the Case of the Symmetric Tensor

    Csaba Csáki🇺🇸 · Hitoshi Murayama🇺🇸 · Ofri Telem🇺🇸

    We study dynanics of $SU(N-4)$ gauge theories with fermions in rank-2 symmetric tensor and $N$ anti-fundamental representations, by perturbing supersymmetric theories with anomaly-mediated supersymmetry breaking. We find the $SU(N)\times U(1)$ global symmetry is dynamically broken to $SO(N)$ for $N\ge 17$, a different result from conjectures in the literature. For $N<17$, theories flow to infrared fixed points.

    ↳ hep-thhep-phPRD(2022)·36 citations
27. 27*

    Entanglement generation in $(1+1)D$ QED scattering processes

    Marco Rigobello🇮🇹 · Simone Notarnicola🇮🇹 · Giuseppe Magnifico🇮🇹 · Simone Montangero🇮🇹

    We study real-time meson-meson scattering processes in $(1+1)$-dimensional QED by means of Tensor Networks. We prepare initial meson wave packets with given momentum and position introducing an approximation based on the free fermions model. Then, we compute the dynamics of two initially separated colliding mesons, observing a rich phenomenology as the interaction strength and the initial states are varied in the weak and intermediate coupling regimes. Finally, we consider elastic collisions and measure some scattering amplitudes as well as the entanglement generated by the process. Remarkably, we identify two different regimes for the asymptotic entanglement between the outgoing mesons: it is perturbatively small below a threshold coupling, past which its growth as a function of the coupling abruptly accelerates.

    ↳ hep-latcond-mat.stat-mechcond-mat.str-elhep-ph+2PRD(2021)·107 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.