Thu·Jul 7, 2022Thursday·July 7, 2022

1. 01*

   Standard Model estimate of $K^{+}\to {\pi }^{+}4e$ branching ratio

   Tomáš Husek (Lund U.)🇸🇪

   The branching ratio of the $K^{+}\to {\pi }^{+}{e}^{+}{e}^{-}{e}^{+}{e}^{-}$ ($K^{+}\to {\pi }^{+}4e$) decay is calculated at leading order in the Standard Model. The dominance of the neutral-pion pole determines the overall branching ratio to be $B(K^{+}\to {\pi }^{+}4e)=B(K^{+}\to {\pi }^{+}{\pi }^0)B({\pi }^0\to 4e)\approx 7.0(3)\times 10^{-6}$. The significance of this contribution is very much concentrated in the context of the whole available phase space, throughout most of which the one-photon-exchange topology is prevalent in turn. It is thus interesting to present branching ratios for only parts of the allowed kinematical region. We find, for instance, $B(K^{+}\to {\pi }^{+}4e,m_{4e}>150\text{MeV})=6.0(6)\times 10^{-11}$.

   hep-phhep-exPRD(2022)·15 citations
2. 02*

   Baseline and other effects for a sterile neutrino at DUNE

   J. T. Penedo🇵🇹 · João Pulido🇵🇹

   We analyze the sensitivity of the Deep Underground Neutrino Experiment (DUNE) to a sterile neutrino, combining information from both near and far detectors. We quantify often-neglected effects which may impact the event rate estimation in a 3+1 oscillation scenario. In particular, we find that taking into account the information on the neutrino production point, in contrast to assuming a pointlike neutrino source, affects DUNE's sterile exclusion reach. Visible differences remain after the inclusion of energy bin-to-bin uncorrelated systematics. Instead, implementing exact oscillation formulae for near detector events, including a two slab density profile, does not result in any visible change in the sensitivity.

   hep-phhep-exPRD(2023)·8 citations
3. 03*

   Tetraquark Masses by using extension of Gursey-Radicati Mass Formula

   Ankush Sharma🇮🇳 · Alka Upadhyay🇮🇳

   Tetraquark states are classified using the $SU(6{)}_{sf}$ spin-flavor symmetry and Young tableau technique. Further, by using the extension of Gursey-Radicati mass formula, masses of tetraquark states are predicted upto good level of accuracy. Also, Decay channels and decay widths of tetraquark states are calculated and found to be in good agreement with the experimental and available theoretical data.

   hep-phPhys. Scr. 98 095308 (2023)·1 citation
4. 04*

   Exploring gluon tomography with polarization dependent diffractive J/$\psi$ production

   James Daniel Brandenburg🇺🇸 · Zhangbu Xu🇺🇸 · Wangmei Zha🇨🇳 · Cheng Zhang🇨🇳 · Jian Zhou🇨🇳 · Yajin Zhou🇨🇳

   We study azimuthal asymmetries in diffractive J/$\psi$ production in ultraperipheral heavy-ion collisions at RHIC and LHC energies using the color glass condensate effective theory. Our calculation successfully describes azimuthal averaged $J/\psi$ production cross section measured by STAR and ALICE. We further predict very large $\cos 2\varphi$ and $\cos 4\varphi$ azimuthal asymmetries for diffractive $J/\psi$ production both in UPCs at RHIC and LHC energies and in eA collisions at EIC energy. These novel polarization dependent observables may provide complementary information for constraining gluon transverse spatial distribution inside large nuclei. As compared to all previous analysis of diffractive $J/\psi$ production, the essential new elements integrated in our theoretical calculations are: the double-slit interference effect, the linear polarization of coherent photons, and the final state soft photon radiation effect.

   hep-phPRD(2022)·27 citations
5. 05*

   Study of F-wave bottom mesons in HQET

   Ritu Garg🇮🇳 · Alka Upadhyay🇮🇳

   We studied $F$-wave bottom mesons in heavy quark effective theory. The available experimental and theoretical data is used to calculate the masses of $F$-wave bottom mesons. The decay widths of bottom mesons are analyzed to find upper bounds of the associated couplings. We also construct Regge trajectories for our predicted data in planes ($J$, $M^2$ ) and our results nicely fit on Regge lines. Our results may provide a crucial information for upcoming experimental studies.

   hep-phPTEP(2022)·2 citations
6. 06*

   Explaining the Cabibbo Angle Anomaly

   Andreas Crivellin🇨🇭

   The determinations of the Cabibbo angle from kaon, pion, $D$ and tau decays disagree with the one from super-allowed beta decays. The resulting $\approx 3\sigma$ deficit in first row (but also first column) CKM unitarity is known as the Cabibbo angle anomaly (CAA). Determining $V_{ud}$ from beta decays requires knowledge of the Fermi constant $G_F$, usually extracted from muon decay. However, because new physics might also affect muon decay, and thus the determination of the Fermi constant, an interesting interplay with the global electroweak fit arises where $G_F$ is a crucial input. In these proceedings we review the CAA and its different interpretations in terms of physics beyond the SM, first discussing the corresponding effect in the effective field theory and then using (simplified) models.

   hep-phhep-exnucl-exnucl-th14 citations
7. 07*

   Top-Yukawa-induced Corrections to Higgs Pair Production

   Margarete Mühlleitner🇩🇪 · Johannes Schlenk🇨🇭 · Michael Spira🇨🇭

   Higgs-boson pair production at hadron colliders is dominantly mediated by the loop-induced gluon-fusion process $gg\to HH$ that is generated by heavy top loops within the Standard Model with a minor per-cent level contamination of bottom-loop contributions. The QCD corrections turn out to be large for this process. In this note, we derive the top-Yukawa-induced part of the electroweak corrections to this process and discuss their relation to an effective trilinear Higgs coupling with integrated out top-quark contributions.

   hep-phhep-exJHEP(2022)·49 citations
8. 08*

   Method to observe the $J^P=2^{+}$ partner of the $X_0(2866)$ in the $B^{+}\to D^{+}{D}^{-}{K}^{+}$ reaction

   M. Bayar🇹🇷 · E. Oset🇪🇸

   We propose a method based on the moments of the $D^{-}{K}^{+}$ mass distribution in the $B^{+}\to D^{+}{D}^{-}{K}^{+}$ decay to disentangle the contribution of the $2^{+}$ state, partner of $X_0(2900)$ in the ${\bar{D}}^{\ast }{K}^{\ast }$ picture for this resonance. Some of these moments show the interference patterns of the $X_1(2900)$ and $X_0(2900)$ with the $2^{+}$ state, which provide a clearer signal of the $2^{+}$ resonance than the $2^{+}$ signal alone. The construction of these magnitudes from present data is easy to implement, and based on these data we show that clear signals for that resonance should be seen even with the present statistics.

   hep-phnucl-thPLB(2022)·15 citations
9. 09*

   Higgs boson contribution to the leading two-loop Yukawa corrections to $gg\to HH$

   Joshua Davies🇬🇧 · Go Mishima🇯🇵 · Kay Schönwald🇩🇪 · Matthias Steinhauser🇩🇪 · Hantian Zhang🇩🇪

   We analytically compute two-loop Yukawa corrections to Higgs boson pair production in the high-energy limit. Such corrections are generated by an exchange of a Higgs boson between the virtual top quark lines. We propose two approaches to obtain expansions of the massive two-loop box integrals and show that precise results are obtained for transverse momenta of the Higgs bosons above about 150 GeV. We discuss in detail the computation of all 140 master integrals and present analytic results.

   hep-phJHEP(2022)·59 citations
10. 10*

    On the structures of new scalar resonances $T_{cs0}^a(2900{)}^{++}$ and $T_{cs0}^a(2900{)}^0$

    S. S. Agaev🇦🇿 · K. Azizi🇮🇷 · H. Sundu🇹🇷

    We investigate properties of the new scalar resonances $T_{cs0}^a(2900{)}^{++}$ and $T_{cs0}^a(2900{)}^0$, which were recently reported by the LHCb collaboration. These states were observed as resonant structures in $D_s^{+}{\pi }^{+}$ and $D_s^{+}{\pi }^{-}$ invariant mass distributions in $B^{+}$ meson decays. We argue that $T_{cs0}^a(2900{)}^{++}$ and $T_{cs0}^a(2900{)}^0$ may be modeled as molecules ${\mathcal{M}}^{++}=D_s^{\ast +}{\rho }^{+}$ and ${\mathcal{M}}^0=D_s^{\ast +}{\rho }^{-}$ of conventional vector mesons, respectively. The mass $m$ and current coupling $f$ of the molecule ${\mathcal{M}}^{++}$ are calculated using two-point sum rule method. The sum rule analysis is performed by taking into account vacuum condensates up to dimension $8$. The obtained result for the mass, $m=(2917\pm 135)\mathrm{MeV}$, permits us to consider the molecule ${\mathcal{M}}^{++}$ as one of possible models of the resonance $T_{cs0}^a(2900{)}^{++}$. Because the second structure $T_{cs0}^a(2900{)}^0$ is isospin partner of the doubly charged state, it should have the mass close to $m$.

    hep-phhep-exhep-latJ.Phys.G(2023)·31 citations
11. 11*

    Deciphering the long-distance penguin contribution to ${\bar{B}}_{d,s}\to \gamma \gamma$ decays

    Qin Qin🇨🇳 · Yue-Long Shen🇨🇳 · Chao Wang🇨🇳 · Yu-Ming Wang🇨🇳

    We compute for the first time the long-distance penguin contribution to the double radiative $B$-meson decays due to the purely hadronic operators acting with the electromagnetic current in the background soft-gluon field from first field-theoretical principles by introducing a novel subleading $B$-meson distribution amplitude. The numerically dominant penguin amplitude arises from the soft-gluon radiation off the light up-quark loop rather than the counterpart charm-loop effect on account of the peculiar analytical behaviour of the short-distance hard-collinear function. Importantly the long-distance up-quark penguin contribution brings about the substantial cancellation of the known factorizable power correction possessing the same multiplication CKM parameters, thus enabling $B_{d,s}\to \gamma \gamma$ to become new benchmark probes of physics beyond the Standard Model.

    hep-phhep-exhep-latPRL(2023)·32 citations
12. 12*

    Muon decay and neutrino mass

    M. M. Giannini🇮🇹

    The calculation of the $\mu$ decay is performed in V-A theory taking into account that, in agreement with the observation of the oscillations, the neutrinos must be massive. Provided that the masses of the electron and muon neutrinos are not higher than the known upper values, the result is a possible modification of the Fermi constant, no effect at all on the polarization of the outgoing electron and possibly an endpoint effect on the electron energy and angle distributions.

    hep-ph1 citation
13. 13*

    An improved upper limit for the (muon based) neutrino mass

    M. M. Giannini🇮🇹

    The width for the mu decay is calculated in the V-A theory leaving open the possibility of non zero neutrino masses. It is shown that not only the agreement with the experimental data is kept, but the smallness of the experimental error allows to improve the constraint of nu mass (muon based) down to 0.021 MeV, provided that nu mass (electron based) is as low as indicated by the 3H beta decay. An analogous constraint for the nu mass (tau based) is not possible since in this case the decay width has a larger experimental error.

    hep-ph3 citations
14. 14*

    ${\chi }_{c1}(2p)$: an overshadowed charmoniumlike resonance

    R. Bruschini🇪🇸 · P. González🇪🇸

    A thorough study of the $J^{PC}=1^{++}$ elastic $D^0{\bar{D}}^{\ast 0}$ and $D^{+}{D}^{\ast -}$ scattering, where the form of the meson-meson interaction is inferred from lattice QCD calculations of string breaking, is carried out for center-of-mass energies up to 4 GeV. We show that the presence of ${\chi }_{c1}(3872)$, which can be naturally assigned to either a bound or virtual charmoniumlike state close below the $D^0{\bar{D}}^{\ast 0}$ threshold, can overshadow a quasiconventional charmoniumlike resonance lying above threshold. This makes difficult the experimental detection of this resonance through the $D^0{\bar{D}}^{\ast 0}$ and $D^{+}{D}^{\ast -}$ channels, despite being its expected main decay modes. We analyze alternative strong and electromagnetic decay modes. Comparison with existing data shows that this resonance may have already been observed through its decay to $\omega J/\psi$.

    hep-phJHEP(2023)·5 citations
15. 15*

    New Benchmark Models for Heavy Neutral Lepton Searches

    Marco Drewes🇧🇪 · Juraj Klarić🇧🇪 · Jacobo López-Pavón🇪🇸

    The sensitivity of direct searches for heavy neutral leptons (HNLs) in accelerator-based experiments depends strongly on the particles properties. Commonly used benchmark scenarios are important to ensure comparability and consistency between experimental searches, re-interpretations, and sensitivity studies at different facilities. In models where the HNLs are primarily produced and decay through the weak interaction, benchmarks are in particular defined by fixing relative strengths of their mixing with SM neutrinos of different flavours, and the interpretation of experimental data is known to strongly depend on those ratios. The commonly used benchmarks in which a single HNL flavour exclusively interacts with one Standard Model generation do not reflect what is found in realistic neutrino mass models. As a part of the activities within CERN's Physics Beyond Colliders initiative we identify two additional benchmarks, which we primarily select based on the requirement to provide a better approximation for the phenomenology of realistic neutrino mass models in view of present and future neutrino oscillation data.

    hep-phhep-exEPJC(2022)·48 citations
16. 16*

    Constituent quark-model hidden-flavor pentaquarks

    H. Garcilazo🇲🇽 · A. Valcarce🇪🇸

    We study hidden-flavor pentaquarks, $Q\bar{Q}qqq$, based on a constituent quark-model with a standard quark-quark interaction that reproduces the low-energy meson and baryon spectra. We make use of dynamical correlations between the heavy quarks arising from the Coulomb-like nature of the short-range interaction. A detailed comparison is made with other results in the literature and with experimental data. Our results show a different pattern for open-flavor and hidden-flavor pentaquarks, as suggested by the data. Further implications about the existence of quarkonia bound to nuclei are discussed.

    hep-phnucl-thPRD(2022)·7 citations
17. 17*

    MUonE, muon $g-2$ and electroweak precision constraints within 2HDMs

    Oliver Atkinson🇬🇧 · Matthew Black🇩🇪 · Christoph Englert🇬🇧 · Alexander Lenz🇩🇪 · Aleksey Rusov🇩🇪

    Two Higgs doublet models are attractive scenarios for physics beyond the Standard Model. In particular, lepton-specific manifestations remain contenders to explain the observed discrepancy between the anomalous magnetic moment of the muon $a_{\mu }$ predicted within the Standard Model and recent observations at Fermilab and BNL. Dominant uncertainties that affect $a_{\mu }$ have motivated the MUonE experiment to access the hadronic vacuum polarisation contribution that impacts $a_{\mu }$ via elastic muon-electron scattering. In this work, we contrast the high precision that is achievable within the MUonE context with constraints from flavour physics, precision electroweak constraints and LHC searches as well as their extrapolations for a range of two Higgs doublet models with a softly broken ${\mathbb{Z}}_2$ symmetry. We find that the sensitivity of MUonE does not extend beyond the parameter regions that are already excluded by other constraints. MUonE will therefore provide a detailed measurement of the hadronic vacuum polarisation contribution which then transparently informs $a_{\mu }$ interpretations in 2HDMs without modifications of correlations from beyond the Standard Model interactions. In passing we extend earlier results of LHC and flavour projections to lepton-specific 2HDM (Types X and Y) scenarios, and comment on the possibility of modifying the value of the W-boson mass; we briefly discuss the implications for a strong first-order electroweak phase transition for these models.

    hep-phhep-exPRD(2022)·21 citations
18. 18*

    Large Extra Dimensions and neutrino experiments

    D. V. Forero🇨🇴 · C. Giunti🇮🇹 · C. A. Ternes🇮🇹 · O. Tyagi🇮🇹

    The existence of Large Extra Dimensions can be probed in various neutrino experiments. We analyze several neutrino data sets in a model with a dominant large extra dimension. We show that the Gallium anomaly can be explained with neutrino oscillations induced by the large extra dimension, but the region of parameter space which is preferred by the Gallium anomaly is in tension with the bounds from reactor rate data, as well as the data of Daya Bay and MINOS. We also present bounds obtained from the analysis of the KATRIN data. We show, that current experiments can put strong bounds on the size $R_{\text{ED}}$ of the extra dimension: $R_{\text{ED}}<0.20\mu \text{m}$ and $R_{\text{ED}}<0.10\mu \text{m}$ at 90\% C.L. for normal and inverted ordering of the standard neutrino masses, respectively.

    hep-phhep-exPRD(2022)·40 citations
19. 19*

    Pseudoscalar MSSM Higgs Production at NLO SUSY--QCD

    Emanuele Bagnaschi🇨🇭 · Lukas Fritz🇨🇭 · Stefan Liebler🇩🇪 · Margarete Mühlleitner🇩🇪 · Thanh Tien Dat Nguyen🇩🇪 · Michael Spira🇨🇭

    One of the most important mechanisms at the Large Hadron Collider (LHC) for the production of the pseudoscalar Higgs boson of the Minimal Supersymmetric Standard Model (MSSM) is the loop-induced gluon fusion process $gg\to A$. The higher-order QCD corrections have been obtained a long time ago and turned out to be large. However, the genuine supersymmetric (SUSY--)QCD corrections have been obtained only in the limit of large SUSY particle masses so far. We describe our calculation of the next-to-leading-order (NLO) SUSY--QCD results with full mass dependence and present numerical results for a few representative benchmark points. We also address the treatment of the effective top and bottom Yukawa couplings, in the case of heavy SUSY particles, in terms of effective low-energy theories where the heavy degrees of freedom have been decoupled. Furthermore, we include a discussion of the relation between the SUSY--QCD corrections that we have computed and the Adler--Bardeen theorem for the axial anomaly. In addition, we apply our results to the gluonic and photonic pseudoscalar Higgs decays $A\to gg,\gamma \gamma$ at NLO.

    hep-phhep-exJHEP(2023)·5 citations
20. 20*

    Discovery of $T_{c\bar{s}0}^a(2900{)}^{0,++}$ implies new charmed-strange pentaquark system

    Hong-Tao An🇨🇳 · Zhan-Wei Liu🇨🇳 · Fu-Sheng Yu🇨🇳 · Xiang Liu🇨🇳

    Inspired by the very recently discovered tetraquark states $T_{c\bar{s}0}^a(2900{)}^{0,++}$ from the LHCb Collaboration, we predict the existence of a new charmed-strange pentaquark system, $c\bar{s}nnn$, which is closely connected to $c\bar{s}n\bar{n}$ by exchanging $\bar{n}$ into $nn$ with $n=u,d$. Especially, it is suggested to experimentally search for the predicted new pentaquark system via the weak decays of $B$ mesons or $b$-baryons, with the support from the study of the mass spectrum and the decay properties. The predicted new pentaquark system must attract extensive attention from experimentalists and theorists when it constructs the ``particle zoo 2.0" in the near future.

    hep-phPRD(2022)·14 citations
21. 21*

    Investigation of $(g-2{)}_{\mu }$ anomaly in the $\mu$-specific 2HDM with Vector like leptons and the phenomenological implications

    Md. Raju🇮🇳 · Abhi Mukherjee🇮🇳 · Jyoti Prasad Saha🇮🇳

    The anomalous magnetic moment of muons has been a long-standing problem in SM. The current deviation of experimental value of the $(g-2{)}_{\mu }$ from the standard model prediction is exactly $4.2\sigma$. Two Higgs Doublet Models can accommodate this discrepancy but such type of model naturally generate flavor changing neutral current(FCNC). To prevent this it was postulated that 2HDM without FCNC required that all fermions of a given charge couple to the same Higgs boson but the rule breaks in Muon Specific Two Higgs Doublet Model where all fermions except muon couple to one Higgs doublet and muon with the other Higgs doublet. The Muon Specific Two Higgs Doublet model explain muon anomaly with a fine tuning problem of very large $\tan \beta$ value with other parameters. We have found a simple solution of this fine tuning problem by extending this model with a vector like lepton generation which could explain the muon anomaly at low $\tan \beta$ value with a heavy pseudo scalar Higgs boson under the shadow of current experimental and theoretical constraints. Moreover, with the help of the cut based analysis and multivariate analysis methods, we have also attempted to shed some light on the potential experimental signature of vector lepton decay to the heavy Higgs boson in the LHC experiment. We have showed that a multivariate analysis can increase the vector like leptons signal significance by up to an order of magnitude than that of a cut based analysis.

    hep-phEPJC(2023)·12 citations
22. 22*

    Anomalous Dimensions from Soft Regge Constants

    Ian Moult🇺🇸 · Sanjay Raman🇺🇸 · Gregory Ridgway🇺🇸 · Iain W. Stewart🇺🇸

    Using an effective field theory (EFT) formalism for forward scattering, we reconsider the factorization of $2\to 2$ scattering amplitudes in the Regge limit. Expanding the amplitude in gauge invariant operators labelled by the number of Glauber exchanges, allows us to further factorize the standard impact factors into separate collinear and soft functions. The soft functions are universal, and describe radiative corrections to the Reggeized gluon states exchanged by the collinear projectiles. Remarkably, we find that the one-loop soft function for the single Reggeized gluon state is given to $\mathcal{O}(ϵ)$ in terms of the two-loop cusp and two-loop rapidity anomalous dimensions. We argue that this iterative structure follows from the simple action of crossing symmetry in the forward scattering limit, which in the EFT allows us to replace the divergent part of a soft loop by a much simpler Glauber loop. We use this correspondence to provide a simple calculation of the two-loop Regge trajectory using the EFT. We then explore its implications at higher perturbative orders, and derive the maximally matter dependent contributions to the Regge trajectory to all loop orders, i.e.~the terms $\sim {\alpha }_s^{k+1}{n}_f^k$ for any $k$, where $n_f$ is the number of massless flavors. These simplifications suggests that the EFT approach to the Regge limit will be helpful to explore and further understand the structure of the Regge limit.

    hep-phnucl-thJHEP(2023)·22 citations
23. 23*

    A New Probe of Relic Neutrino Clustering using Cosmogenic Neutrinos

    Vedran Brdar🇺🇸 · P. S. Bhupal Dev🇺🇸 · Ryan Plestid🇺🇸 · Amarjit Soni🇺🇸

    We propose a new probe of cosmic relic neutrinos (C$\nu$B) using their resonant scattering against cosmogenic neutrinos. Depending on the lightest neutrino mass and the energy spectrum of the cosmogenic neutrino flux, a Standard Model vector meson (such as a hadronic $\rho$) resonance can be produced via $\nu \bar{\nu }$ annihilation. This leads to a distinct absorption feature in the cosmogenic neutrino flux at an energy solely determined by the meson mass and the neutrino mass, apart from redshift. By numerical coincidence, the position of the $\rho$-resonance overlaps with the originally predicted peak of the Greisen-Zatsepin-Kuzmin (GZK) neutrino flux, which offers an enhanced absorption effect at higher redshifts. We show that this absorption feature in the GZK neutrino flux may be observable in future radio-based neutrino observatories, such as IceCube-Gen2 radio, provided there exists a large overdensity in the C$\nu$B distribution. This therefore provides a new probe of C$\nu$B clustering at large redshifts, complementary to the laboratory probes (such as KATRIN) at zero redshift.

    hep-phastro-ph.HEPLB(2022)·40 citations
24. 24*

    Infrared singularities of multi-leg QCD amplitudes with a massive parton at three loops

    Ze Long Liu🇨🇭 · Nicolas Schalch🇨🇭

    We derive the structure of three-loop anomalous dimensions governing infrared singularities of QCD amplitudes with one massive and an arbitrary number of massless external partons. The contributions of tripole and quadrupole correlations involving a massive parton are studied in details. The analytical expression of tripole correlations between one massive and two massless partons is obtained at three loops for the first time. We regularize the infrared divergences in the soft matrix element in a novel approach, where no extra scale dependence is involved, and the calculation can be performed in momentum space. Our results are essential to improve the theoretical predictions of single top and top quark pair productions at hadron colliders.

    hep-phhep-thPRL(2022)·24 citations
25. 25*

    First-Order Electroweak Phase Transition and Baryogenesis from a Naturally Light Singlet Scalar

    Keisuke Harigaya🇨🇭 · Isaac R. Wang🇺🇸

    We investigate a minimal singlet-scalar extension to the Standard Model that achieves a strong first-order electroweak phase transition. The singlet can be naturally light because of an approximate shift symmetry and no extra hierarchy problem beyond that of the Standard Model Higgs is introduced. We discuss the two-field dynamics of the phase transition in detail and find that the gravitational-wave signal is too weak to be detected by near-future observations. We also discuss the meta-stability of the zero-temperature scalar potential. Despite the apparent instability just above the electroweak scale, we show that the lifetime of the electroweak vacuum is much longer than the age of the universe and hence the setup does not require UV completion near the electroweak scale. The baryon asymmetry of the universe may be explained by local electroweak baryogenesis arising from a coupling between the singlet and weak gauge boson. The predicted electron electric dipole moment is much below the current bound. The viable parameter space can be probed by the observations of rare Kaon decay and the cosmic microwave background.

    hep-phastro-ph.CO16 citations
26. 26*

    Multi-component Dark Sectors: Symmetries, Asymmetries and Conversions

    Arnau Bas i Beneito🇪🇸 · Juan Herrero-García🇪🇸 · Drona Vatsyayan🇪🇸

    We study the relic abundance of several stable particles from a generic dark sector, including the possible presence of dark asymmetries. After discussing the different possibilities for stabilising multi-component dark matter, we analyse the final relic abundance of the symmetric and asymmetric dark matter components, paying special attention to the role of the unavoidable conversions between dark matter states. We find an exponential dependence of the asymmetries of the heavier components on annihilations and conversions. We conclude that having similar symmetric and asymmetric components is a natural outcome in many scenarios of multi-component dark matter. This has novel phenomenological implications, which we briefly discuss.

    hep-phJHEP(2022)·18 citations
27. 27*

    Scalar leptoquarks at the LHC and flavour anomalies: a comparison of pair-production modes at NLO-QCD

    Christoph Borschensky🇩🇪 · Benjamin Fuks🇫🇷 · Adil Jueid🇰🇷 · Anna Kulesza🇩🇪

    We analyse scalar leptoquark pair production at the LHC with predictions including $t$-channel lepton exchange contributions up to next-to-leading order (NLO) in QCD. In particular, we calculate NLO-QCD predictions for off-diagonal production channels, {\it i.e.}\ channels that involve two different leptoquark eigenstates and are driven solely by diagrams involving Standard Model leptons in the $t$-channel at leading order, as opposed to diagonal channels where a pair of the same leptoquark eigenstate is produced. We find that reliable theoretical predictions for both channels require NLO accuracy. The relative importance of the off-diagonal modes depends strongly on the considered scenario. In a generic model involving $R_2$ and $S_3$ leptoquarks, at large values of the Yukawa couplings off-diagonal contributions initiated by valence quarks can be up to an order of magnitude higher than the diagonal production. However, we also find that in phenomenologically viable scenarios addressing the flavour anomalies off-diagonal production is generally negligible, with a few exceptions of 10\%--30\% of the total rate depending on the treatment of the charm density in the proton.

    hep-phJHEP(2022)·17 citations
28. 28*

    Snowmass 2021 White Paper: Cosmogenic Dark Matter and Exotic Particle Searches in Neutrino Experiments

    J. Berger🇺🇸 · D. Brailsford🇬🇧 · K. Choi🇰🇷 · J. I. Crespo-Anadón🇪🇸 · Y. Cui🇺🇸 · A. Das🇺🇸 · J. A. Dror🇺🇸 · A. Habig🇺🇸 · Y. Itow🇯🇵 · E. Kearns🇺🇸 · D. Kim🇺🇸 · J.-C. Park🇰🇷 and 6 other authors

    The signals from outer space and their detection have been playing an important role in particle physics, especially in discoveries of and searches for physics beyond the Standard Model (BSM); beyond the evidence of dark matter (DM), for example, the neutrinos produced from the dark matter annihilation is important for the indirect DM searches. Moreover, a wide range of new, well-motivated physics models and dark-sector scenarios have been proposed in the last decade, predicting cosmogenic signals complementary to those in the conventional direct detection of particle-like dark matter. Most notably, various mechanisms to produce (semi-)relativistic DM particles in the present universe (e.g. boosted dark matter) have been put forward, while being consistent with current observational and experimental constraints on DM. The resulting signals often have less intense and more energetic fluxes, to which underground, kiloton-scale neutrino detectors can be readily sensitive. In addition, the scattering of slow-moving DM can give rise to a sizable energy deposit if the underlying dark-sector model allows for a large mass difference between the initial and final state particles, and the neutrino experiments with large volume detectors are well suited for exploring these opportunities. This White Paper is devoted to discussing the scientific importance of the cosmogenic dark matter and exotic particle searches, not only overviewing the recent efforts in both the theory and the experiment communities but also providing future perspectives and directions on this research branch. A landscape of technologies used in neutrino detectors and their complementarity is discussed, and the current and developing analysis strategies are outlined.

    hep-phhep-ex23 citations
29. 29*

    Holographic entropy production in a Bjorken expanding hot and dense strongly coupled quantum fluid

    Romulo Rougemont🇧🇷 · Willians Barreto🇧🇷

    We analyze the time evolution of several physical observables, namely the pressure anisotropy, the scalar condensate, the charge density, and also, for the first time, the non-equilibrium entropy for a Bjorken expanding strongly coupled $\mathcal{N}=4$ Supersymmetric Yang-Mills plasma charged under an Abelian $U(1)$ subgroup of the global $SU(4)$ R-symmetry. This represents a far-from-equilibrium, hot and dense strongly coupled quantum fluid with a critical point in its phase diagram. For some sets of initial data preserving all the energy conditions, dynamically driven transient violations of the dominant and the weak energy conditions are observed when the plasma is still far from the hydrodynamic regime. The energy conditions violations get stronger at larger values of the chemical potential to temperature ratio, $\mu /T$, indicating that those violations become more relevant as the strongly coupled quantum fluid approaches its critical regime. For some of those energy conditions violations, it is observed a clear correlation with different plateau structures formed in the far from equilibrium entropy, indicating the presence of transient, early time windows where the Bjorken expanding plasma has zero entropy production even while being far from equilibrium. The hydrodynamization of the pressure anisotropy and also the much later thermalization of the scalar condensate are generally found to be delayed, within small relative tolerances, as $\mu /T$ is increased towards criticality. The value of $\mu /T$ in the medium is enhanced by increasing its initial charge density, and/or also by reducing its initial energy density.

    ↳ hep-thhep-phnucl-thPRD(2022)·11 citations
30. 30*

    Constraints on Dark Matter-Neutrino Interaction from 21-cm Cosmology and Forecasts on SKA1-Low

    Antara Dey🇮🇳 · Arnab Paul🇮🇳 · Supratik Pal🇮🇳

    In this article, we have done a thorough investigation of the possible effects of interaction between dark matter (DM) and neutrinos on reionization history. We have constrained the interaction strength using 21 cm Cosmology and found out possible deviations from standard, non-interacting $\Lambda$CDM scenario. Comparing the results with the existing constraints from present cosmological observations reveals that 21 cm observations are more competent to constrain the interaction strength by a few orders of magnitude. We have also searched for prospects of detecting any such interaction in the upcoming 21 cm mission SKA1-Low by doing a forecast analysis and error estimation.

    ↳ astro-ph.COhep-phMNRAS(2023)·19 citations
31. 31*

    Dynamics of Stellar Disk Tilting from Satellite Mergers

    Benjamin C. Dodge🇺🇸 · Oren Slone🇺🇸 · Mariangela Lisanti🇺🇸 · Timothy Cohen🇺🇸

    The Milky Way's stellar disk can tilt in response to torques that result from infalling satellite galaxies and their associated tidal debris. In this work, we explore the dynamics of disk tilting by running N-body simulations of mergers in an isolated, isotropic Milky Way-like host galaxy, varying over satellite virial mass, initial position, and orbit. We develop and validate a first-principles understanding of the dynamics that govern how the host galaxy's stellar disk responds to the satellite's dark matter debris. We find that the degree of disk tilting can be large for cosmologically-motivated merger histories. In particular, our results suggest that the Galactic disk may still be tilting in response to Gaia-Sausage-Enceladus, one of the most significant recent mergers in the Milky Way's history. These findings have implications for terrestrial direct detection experiments as disk tilting changes the relative location of the Sun with respect to dark matter substructure left behind by a merging galaxy.

    ↳ astro-ph.GAastro-ph.COhep-phMNRAS(2022)·8 citations
32. 32*

    A handbook of holographic 4-point functions

    Adam Bzowski🇵🇱 · Paul McFadden🇬🇧 · Kostas Skenderis🇬🇧

    We present a comprehensive discussion of tree-level holographic $4$-point functions of scalar operators in momentum space. We show that each individual Witten diagram satisfies the conformal Ward identities on its own and is thus a valid conformal correlator. When the $\beta =\Delta -d/2$ are half-integral, with $\Delta$ the dimensions of the operators and $d$ the spacetime dimension, the Witten diagrams can be evaluated in closed form and we present explicit formulae for the case $d=3$ and $\Delta =2,3$. These correlators require renormalization, which we carry out explicitly, and lead to new conformal anomalies and beta functions. Correlators of operators of different dimension may be linked via weight-shifting operators, which allow new correlators to be generated from given `seed' correlators. We present a new derivation of weight-shifting operators in momentum space and uncover several subtleties associated with their use: such operators map exchange diagrams to a linear combination of exchange and contact diagrams, and special care must be taken when renormalization is required.

    ↳ hep-thhep-phJHEP(2022)·40 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.