Abstract We study non-supersymmetric AdS D × I solutions in the context of (D + 1) dimensional gravity coupled to an axio-dilaton with arbitrary runaway potential for the dilaton and arbitrary exponential coupling of the dilaton to the axion kinetic energy. We analyze the equations of motion, reformulate them in terms of a first order autonomous dynamical system, and discuss the set of fixed points, their physical interpretation and their stability conditions. We find a few special classes of analytic solutions for arbitrary D, including AdS9 × I backgrounds in type IIB supergravity. We conclude by discussing the properties of numerical flows including the massive IIA supergravity case.
Abstract We present updated predictions for the lifetimes of all weakly decaying doubly heavy baryons, including bb, cc, and bc baryons, as well as for the B c meson. The analysis includes NNLO corrections to the leading dimension-three contribution, NLO corrections to the chromomagnetic term, and the complete set of currently known NLO corrections to the dimension-six heavy-light quark spectator contributions, including penguin terms. We also compare the results in the $$\overline{\text{M}\text{S} }$$ , kinetic, and, where applicable, Υ mass schemes. For the bc baryons, we present predictions for both possible ground-state diquark-spin assignments, S bc = 0 and S bc = 1. In the kinetic scheme we obtain the lifetime hierarchies $$\tau \left({\Xi}_{bb}^{0}\right)<\tau \left({\Xi}_{bb}^{-}\right)\simeq \tau \left({\Omega}_{bb}^{-}\right),\tau \left({\Xi}_{cc}^{+}\right)<\tau \left({\Omega}_{cc}^{+}\right)<\tau \left({\Xi}_{cc}^{++}\right),\tau \left({\Xi}_{bc}^{0}\right)\lesssim \tau \left({\Omega}_{bc}^{0}\right)<\tau \left({\Xi}_{bc}^{+}\right)$$ for S bc = 0, and $$\tau \left({\Xi}_{bc}^{{\prime}0}\right)<\tau \left({\Omega}_{bc}^{{\prime}0}\right)<\tau \left({\Xi}_{bc}^{{\prime}+}\right)$$ for S bc = 1. We also revisit the B c lifetime and discuss the impact of the newly included Darwin term.
Abstract We study cubic interactions of N $$ \mathcal{N} $$ = 2 massless integer-spin gauge supermultiplets in harmonic superspace. We construct the complete class of abelian (s, s 1 , s 2 ) cubic vertices with the minimal number of space-time derivatives. Such vertices exist only for s ≥ s 1 + s 2 and universally take the form of the gauge prepotential coupled to the conserved higher-spin supercurrent. For s 1 ≠ s 2 , we find the novel complex principal supercurrent, whose real and imaginary parts generate the parity-invariant and the parity-breaking interactions, respectively. The supercurrents are constructed from gauge-invariant N $$ \mathcal{N} $$ = 2 higher-spin Weyl supertensors associated with the spin-s 1 and spin-s 2 gauge multiplets. These supertensors are defined in terms of unconstrained higher-spin analytic prepotentials. We also derive the complete set of conserved component higher-spin currents associated with the (s, s 1, s 2) vertices, including both traceless currents and currents with the non-vanishing trace.
A bstract The difference between the charged and neutral pion masses can be predicted from a well-known dispersion relation involving a weighted integral of the vector-minus-axial spectral function over all energies. This relation, however, holds only in the chiral limit, while phenomenological applications involve physical light-quark masses and spectral input known only up to a finite scale. Here we combine dispersion theory, the operator product expansion and chiral perturbation theory with dynamical photons to determine the form of the corresponding physical finite-energy sum rule, including all corrections linear in the light-quark masses. We test this generalized relation using hadronic tau-decay data.
In this work, we investigate the effects of TT and root- TT deformations on reflected and entanglement entropy in the context of both pure and mixed state entanglement measures. Utilizing a mixed boundary condition framework, we analyze how these deformations modify entanglement structures and explore their implications in three-dimensional AdS space. Our results provide insights into the interplay between solvable irrelevant and marginal deformations and quantum information-theoretic quantities, shedding light on the entanglement structure of deformed theories.
Abstract In this work, we investigate the effects of T T ¯ $$ \mathrm{T}\overline{\mathrm{T}} $$ and root- T T ¯ $$ \mathrm{T}\overline{\mathrm{T}} $$ deformations on reflected and entanglement entropy in the context of both pure and mixed state entanglement measures. Utilizing a mixed boundary condition framework, we analyze how these deformations modify entanglement structures and explore their implications in three-dimensional AdS space. Our results provide insights into the interplay between solvable irrelevant and marginal deformations and quantum information-theoretic quantities, shedding light on the entanglement structure of deformed theories.
A bstract We propose a reformulation of the conformal perturbation theory of the correlation functions in $$J\overline{J }$$ -deformed CFTs as a dressing on the deformed operators, that matches both bare and renormalized perturbation theory. The key is to use the Riemann bilinear identity to convert the deformation into a dressing and a large-cycle integral for higher genus. Based on the proposal, we calculate the deformation of partition functions on the torus and higher genus Riemann surfaces, which can be written as kernel integrals that preserve modular invariance or covariance. We also calculate the flow of the conformal weights and conserved charges along the deformation. Based on this flow and the modular S -transformation, we propose a criterion for constructing dressed operators. We test our formalism and results by studying the O (2 , 2) theories and strings on the TsT background.
A bstract Two machine learning techniques for jet measurements at the LHCb experiment are presented: a regression-based method for jet-energy calibration and a deep neural network algorithm for jet flavour tagging, distinguishing between b -quark, c -quark, and light parton jets. These techniques are applied to a search for inclusive $$ H\to b\overline{b} $$ H → b b ¯ and $$ H\to c\overline{c} $$ H → c c ¯ decays using a LHCb dataset corresponding to an integrated luminosity of 1.6 fb − 1 . The observed (expected) 95% confidence level upper limits correspond to 6.6 (11.1) times the SM cross-section for the $$ H\to b\overline{b} $$ H → b b ¯ process, and 1003 (1834) times the SM cross-section for the $$ H\to c\overline{c} $$ H → c c ¯ process.
A bstract The non-leptonic D 0 → K − K + and D 0 → π − π + decays are powerful probes of the Standard Model and are related to each other through the U -spin symmetry of the strong interaction. Using lattice QCD inputs we calculate the corresponding colour-allowed tree amplitudes in factorisation and demonstrate that non-factorisable contributions and U -spin-breaking effects at the level of 50% allow us to accommodate the measured branching ratios in the Standard Model. An exciting direct probe of such non-factorisable and U -spin breaking effects is provided by the $$ {D}^0\to {K}_{\mathrm{S}}^0{K}_{\mathrm{S}}^0 $$ D 0 → K S 0 K S 0 channel. This decay is governed by non-factorisable exchange topologies and essentially vanishes in the U -spin limit, although it is experimentally well established with a prominent branching ratio. Extrapolating our D 0 → K − K + results using the isospin symmetry, we find a consistent benchmark picture. Specifically, we can accommodate the measured $$ {D}^0\to {K}_{\mathrm{S}}^0{K}_{\mathrm{S}}^0 $$ D 0 → K S 0 K S 0 branching ratio with U -spin-breaking effects at the 50% level and exchange amplitudes at the level of 50% of the colour-allowed D 0 → K − K + , D 0 → π − π + tree contributions. Finally, we explore the resulting range for direct CP violation in $$ {D}^0\to {K}_{\mathrm{S}}^0{K}_{\mathrm{S}}^0 $$ D 0 → K S 0 K S 0 , obtaining upper bounds in our benchmark scenarios of a few per mille, offering an exciting target for future measurements.
A bstract We study constraints imposed by four-dimensional unitarity (formalised as graded unitarity in recent work by the first author) on possible $$ {\mathcal{W}}_3 $$ W 3 vertex algebras arising from four-dimensions via the SCFT/VOA correspondence. Under the assumption that the $$ \mathbf{\mathfrak{R}} $$ R -filtration is a weight-based filtration with respect to the usual strong generators of the vertex algebra, we demonstrate that all values of the central charge other than those of the (3, q + 4) minimal models are incompatible with four-dimensional unitarity. These algebras are precisely the ones that are realised by performing principal Drinfel’d-Sokolov reduction to boundary-admissible $$ {\mathbf{\mathfrak{sl}}}_3 $$ sl 3 affine current algebras; those affine algebras were singled out by a similar graded unitarity analysis in [1]. Furthermore, these particular vertex algebras are known to be associated with the ( A 2 , A q ) Argyres-Douglas theories.
A bstract We study entanglement entropy in the low-energy effective field theory of two-dimensional string theory as well as in the singlet sector of the dual c = 1 matrix quantum mechanics. From the target space perspective, we argue that a generic bulk subregion is expected to have an associated generalized entanglement entropy combining a dilaton-dependent gravitational term and a matter contribution coming from the tachyon, extending the construction from black hole horizons to arbitrary subregions. Motivated by the absence of the gravitational area-like term in previous analyses of entanglement entropy in the c = 1 model, we compute the effect on the entanglement entropy of the nonlocal transformation induced by the leg-pole factor that relates the target space tachyon and the matrix model collective excitations, finding that it cannot account for the area-like term. We offer preliminary comments on the possible origin of the area term in the non-singlet sectors of the theory.
We determine the AdS5 × S5 solution of type IIB superstring field theory (SFT) to the third order in the expansion with respect to Ramond-Ramond (RR) flux, demonstrate its supersymmetry from the SFT gauge transformations, and identify the massless RR axion in the spectrum of linearized fluctuations. We present an all-order solution in the pp-wave limit and comment on potential obstructions to, and the existence of, the all-order AdS5 × S5 solution.
Abstract The single top quark t-channel production cross section is measured in proton-proton collisions at the CERN LHC at s = 5.02 $$ \sqrt{s}=5.02 $$ TeV, using data recorded with the CMS detector in 2017, corresponding to an integrated luminosity of 302 pb −1, and resulting in the first CMS measurement of the process at that energy. Events with one electron or muon and two or more jets, among which at least one is identified as originating from a b quark fragmentation, are analyzed. The combined cross section of single top quark (tq) and single top antiquark ( t ¯ q $$ \overline{\mathrm{t}}\mathrm{q} $$ ) production is σ tq + t ¯ q = 25.5 − 3.5 + 3.6 stat − 3.9 + 4.2 syst ± 0.5 lumi $$ \sigma \left(\mathrm{tq}+\overline{\mathrm{t}}\mathrm{q}\right)={25.5}_{-3.5}^{+3.6}{\left(\mathrm{stat}\right)}_{-3.9}^{+4.2}\left(\mathrm{syst}\right)\pm 0.5\left(\mathrm{lumi}\right) $$ pb. The individual cross sections are measured to be σ tq = 17.7 − 2.7 + 2.9 stat − 2.4 + 2.6 syst ± 0.3 lumi $$ \sigma \left(\mathrm{tq}\right)={17.7}_{-2.7}^{+2.9}{\left(\mathrm{stat}\right)}_{-2.4}^{+2.6}\left(\mathrm{syst}\right)\pm 0.3\left(\mathrm{lumi}\right) $$ pb and σ t ¯ q = 6.7 − 1.6 + 2.4 stat − 2.5 + 2.1 syst ± 0.1 lumi $$ \sigma \left(\overline{\mathrm{t}}\mathrm{q}\right)={6.7}_{-1.6}^{+2.4}{\left(\mathrm{stat}\right)}_{-2.5}^{+2.1}\left(\mathrm{syst}\right)\pm 0.1\left(\mathrm{lumi}\right) $$ pb. Their ratio is measured to be R t − ch = 2.7 − 0.8 + 1.5 stat − 0.3 + 1.2 syst $$ {\mathcal{R}}_{\mathrm{t}-\mathrm{ch}}={2.7}_{-0.8}^{+1.5}{\left(\mathrm{stat}\right)}_{-0.3}^{+1.2}\left(\mathrm{syst}\right) $$ . The absolute value of the Cabibbo-Kobayashi-Maskawa matrix element is found to be |f LV V tb| = 0.92 ± 0.09(exp) ± 0.01(theo). The measurements are in good agreement with the standard model predictions at next-to-next-to-leading order accuracy in quantum chromodynamics.
Abstract A search for microscopic black holes, string balls, and electroweak sphalerons using proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV recorded with the CMS detector at the CERN LHC during the 2016–2018 data taking, and corresponding to an integrated luminosity of 138 fb −1, is presented. Two search strategies based on control samples in data are used. Model-independent limits on the cross section of physics phenomena with multiple energetic jets, leptons, and photons are set using a method that relies on the shape invariance of the scalar sum of the transverse momenta of all objects in the event. Model-dependent limits on black hole and sphaleron production are set using a newly introduced method that has been developed for the identification of collider events with distinct kinematic features by separating them into classes based on phase space proximity. In the context of models with large extra dimensions, semiclassical black holes and string balls with masses below 8.4–11.4 TeV and 9.0–10.7 TeV, respectively, are excluded at 95% confidence level, significantly extending the reach beyond previous searches. Results of a dedicated search for electroweak sphalerons are used to derive an upper limit of 0.0034 at 95% confidence level on the fraction of quark-quark interactions, with a center-of-mass energy above the nominal sphaleron transition energy threshold of 9 TeV, that result in a sphaleron transition.
Abstract The semileptonic decays of B q mesons (q = u, d, s) to J P = 2+ charmed mesons are investigated. The form factors parametrising the hadronic matrix elements of the weak vector and axial-vector quark currents are evaluated using light-cone QCD sum rules with external B q state, including the 3-particle contributions. The form factors of pseudoscalar and tensor quark currents occurring in extensions of the Standard Model are also determined. The relations expected in the heavy quark limit are tested, providing a hint about the size of finite heavy quark mass corrections for the various form factors. Results are presented for the semileptonic B q to heavy tensor meson decay rates in the Standard Model, and for the ratios testing Lepton Flavour Universality.
The single top quark t-channel production cross section is measured in proton-proton collisions at the CERN LHC at √(s)=5.02 TeV, using data recorded with the CMS detector in 2017, corresponding to an integrated luminosity of 302 pb−1, and resulting in the first CMS measurement of the process at that energy. Events with one electron or muon and two or more jets, among which at least one is identified as originating from a b quark fragmentation, are analyzed. The combined cross section of single top quark (tq) and single top antiquark ( tq ) production is σ(tq+tq)=25.5_-3.5^+3.6(stat)_-3.9^+4.2(syst)± 0.5(lumi) pb. The individual cross sections are measured to be σ(tq)=17.7_-2.7^+2.9(stat)_-2.4^+2.6(syst)± 0.3(lumi) pb and σ(tq)=6.7_-1.6^+2.4(stat)_-2.5^+2.1(syst)± 0.1(lumi) pb. Their ratio is measured to be ℛ_t-ch=2.7_-0.8^+1.5(stat)_-0.3^+1.2(syst) . The absolute value of the Cabibbo-Kobayashi-Maskawa matrix element is found to be |fLVVtb| = 0.92 ± 0.09(exp) ± 0.01(theo). The measurements are in good agreement with the standard model predictions at next-to-next-to-leading order accuracy in quantum chromodynamics.
Abstract We use symmetries to define a new class of operators and compute their correlation functions in the J T ¯ $$ J\overline{T} $$ -deformed conformal field theory on the plane, following the strategy developed in [1]. The symmetry algebra of the deformed theory consists of a local Virasoro-Kac-Moody algebra in the left-moving sector and a non-local counterpart in the right-moving sector. This algebraic structure guides the definition of distinct operator classes. In this paper, we focus on two types of operators: Dressed operators transform as primaries under the symmetries and depend on non-local coordinates, which involve integration over a region. Physical operators, introduced in this work, depend only on local quantities at the classical level and can be expressed in a manageable way in terms of dressed operators and currents. At the quantum level, we assume the existence of dressed operators and the Ward identities that relate them. The physical operators are then defined via the dressed operators and currents, the expression of which is a natural uplifting of the classical version. This formulation allows the powerful constraints of conformal symmetry to be leveraged for computing physical observables. Consequently, we employ conformal perturbation theory to compute the two-point and N-point functions of physical operators. In momentum space, we sum the most UV-sensitive contributions to all orders; the results show precise agreement with string theory predictions. In position space, the leading-log contributions to the two-point correlators are summed to all orders in the deformation parameter, revealing non-perturbative behavior.
A search for microscopic black holes, string balls, and electroweak sphalerons using proton-proton collisions at √(s)=13 TeV recorded with the CMS detector at the CERN LHC during the 2016–2018 data taking, and corresponding to an integrated luminosity of 138 fb−1, is presented. Two search strategies based on control samples in data are used. Model-independent limits on the cross section of physics phenomena with multiple energetic jets, leptons, and photons are set using a method that relies on the shape invariance of the scalar sum of the transverse momenta of all objects in the event. Model-dependent limits on black hole and sphaleron production are set using a newly introduced method that has been developed for the identification of collider events with distinct kinematic features by separating them into classes based on phase space proximity. In the context of models with large extra dimensions, semiclassical black holes and string balls with masses below 8.4–11.4 TeV and 9.0–10.7 TeV, respectively, are excluded at 95
Inclusive, differential and production-mode cross-section measurements of the Higgs boson are performed in the H → ZZ* → 4ℓ decay channel. The analysis uses proton–proton collision data produced at the Large Hadron Collider at a centre-of-mass energy of √(s)=13.6 TeV and recorded with the ATLAS detector, corresponding to an integrated luminosity of 164 fb−1. The inclusive fiducial cross-section for the H → ZZ* → 4ℓ process is measured to be σ_fid=3.65_-0.33^+0.35 fb, in agreement with the Standard Model prediction of σ_fid^SM=3.68± 0.17 fb. Differential cross-sections are measured as a function of key kinematic observables of the Higgs boson and the four-lepton final state. Cross-sections are measured for the main production-modes in several exclusive regions of the Higgs boson production phase space and combined to measure an overall Higgs boson signal strength, defined as the measured cross-section normalised to the SM prediction, of μ = 0.99 ± 0.13. The results are interpreted in terms of modifications of Higgs boson couplings using the κ framework, within the Standard Model Effective Field Theory, and in scenarios probing the Higgs boson self-coupling. All the results are consistent with Standard Model expectations.
A bstract In holography, the complexity-momentum correspondence relates the increasing momentum of a point particle falling into an eternal black hole to the rate of growth of the Krylov complexity of the dual boundary state, a conjecture established exactly for the BTZ black hole in AdS 3 at the semiclassical level. We examine possible extensions of the correspondence by considering boundary higher Krylov complexities and Krylov correlators encoding fluctuations and temporal correlations of the spreading quantum state. To this end, we derive exact results for Krylov correlators in quantum systems with $$ \mathfrak{sl}\left(2,\mathbb{R}\right) $$ sl 2 ℝ or Heisenberg-Weyl symmetry and apply them to the complexity-momentum correspondence. We show that certain out-of-time-ordered correlators of two or more Krylov speed operators at different times are proportional to combinations of the proper radial momenta of a particle falling into the BTZ black hole in AdS 3 , evaluated at those times. This represents a first step in the generalization of the original complexity-momentum relation.
