Journal of High Energy Physics

List of Papers (Total 10,858)

Mixed global anomalies and boundary conformal field theories

Abstract We consider the relation between mixed global gauge gravitational anomalies and boundary conformal field theory in WZW models for simple Lie groups. The discrete symmetries of consideration are the centers of the simple Lie groups. These mixed anomalies prevent gauging them i.e, taking the orbifold by the center. The absence of anomalies impose conditions on the levels...

Measurements of Higgs boson properties in the diphoton decay channel in proton-proton collisions at $$\sqrt{s}=13$$ TeV

Abstract Measurements of Higgs boson properties in the H → γγ decay channel are reported. The analysis is based on data collected by the CMS experiment in proton-proton collisions at $$\sqrt{s}=13$$ TeV during the 2016 LHC running period, corresponding to an integrated luminosity of 35.9 fb−1. Allowing the Higgs mass to float, the measurement yields a signal strength relative...

Study of ϒ production in pPb collisions at $$\sqrt{s_{\mathrm{NN}}}=8.16$$ TeV

Abstract The production of ϒ(nS) mesons (n = 1, 2, 3) in pPb and Pbp collisions at a centre-of-mass energy per nucleon pair $$\sqrt{s_{\mathrm{NN}}}=8.16$$ TeV is measured by the LHCb experiment, using a data sample corresponding to an integrated luminosity of 31.8 nb−1. The ϒ(nS) mesons are reconstructed through their decays into two opposite-sign muons. The measurements...

Strings with non-relativistic conformal symmetry and limits of the AdS/CFT correspondence

Abstract We find a Polyakov-type action for strings moving in a torsional Newton-Cartan geometry. This is obtained by starting with the relativistic Polyakov action and fixing the momentum of the string along a non-compact null isometry. For a flat target space, we show that the world-sheet theory becomes the Gomis-Ooguri action. From a target space perspective these strings are...

Supersymmetric action for multiple D0-brane system

Abstract We have constructed a complete action for the system of N D0-branes in flat 10D type IIA superspace. It is invariant under the rigid spacetime supersymmetry and local worldline supersymmetry (κ-symmetry). This latter can be considered as supersymmetry of maximal 1d SU(N) SYM model which is made local by coupling to supergravity induced by embedding of the center of...

Implications of scalar and tensor explanations of $${\mathrm{R}}_{{\mathrm{D}}^{\left(\ast \right)}}$$

Abstract We investigate the implications of scalar and tensor operators proposed to accommodate the hints of lepton flavor universality violation in charged-current B-meson decays. We show that these scenarios unavoidably induce chirality enhanced contributions to charged lepton magnetic moments and Yukawa couplings. By using an effective field theory approach we quantify in a...

Calogero-Sutherland approach to defect blocks

Abstract Extended objects such as line or surface operators, interfaces or boundaries play an important role in conformal field theory. Here we propose a systematic approach to the relevant conformal blocks which are argued to coincide with the wave functions of an integrable multi-particle Calogero-Sutherland problem. This generalizes a recent observation in [1] and makes...

Relating ’t Hooft anomalies of 4d pure Yang-Mills and 2d ℂℙN− 1 model

Abstract It has recently been shown that a center-twisted compactification of the four-dimensional pure SU(N) Yang-Mills theory on a three-torus gives rise to the twodimensional ℂℙN− 1-model on a circle with a flavor-twisted boundary condition. We verify the consistency of this statement non-perturbatively at theta angle θ = π, in terms of the mixed ’t Hooft anomalies for flavor...

Relativistic Runge-Lenz vector: from $$\mathcal{N}=4$$ SYM to SO(4) scalar field theory

Abstract Starting from $$\mathcal{N}=4$$ SYM and using an appropriate Higgs mechanism we reconsider the construction of a scalar field theory non-minimally coupled to a Coulomb potential with a relativistic SO(4) symmetry and check for scalar field consistency conditions. This scalar field theory can also be obtained from a relativistic particle Lagrangian with a proper...

Hard photons in hadroproduction of top quarks with realistic final states

Abstract We present a complete description of top quark pair production in association with a hard photon in the dilepton channel. Our calculation is accurate to NLO in QCD. It is based on matrix elements for $${e}^{+}{\nu}_e{\mu}^{-}{\overline{\nu}}_{\mu }b\overline{b}\upgamma$$ production and includes all resonant and non-resonant diagrams, interferences, and off-shell...

The Angantyr model for heavy-ion collisions in Pythia8

Abstract We present a new model for building up complete exclusive hadronic final states in high energy nucleus collisions. It is a direct extrapolation of high energy pp collisions (as described by Pythia), and thus bridges a large part of the existing gap between heavy ion and high energy physics phenomenology. The model is inspired by the old Fritiof model and the notion of...

Medium modification of the shape of small-radius jets in central Pb-Pb collisions at $$\sqrt{s_{\mathrm{NN}}}=2.76$$ TeV

Abstract We present the measurement of a new set of jet shape observables for track-based jets in central Pb-Pb collisions at $$\sqrt{s_{\mathrm{NN}}}=2.76$$ TeV. The set of jet shapes includes the first radial moment or angularity, g; the momentum dispersion, pTD; and the difference between the leading and sub-leading constituent track transverse momentum, LeSub. These...

The groomed and ungroomed jet mass distribution for inclusive jet production at the LHC

Abstract We study jet mass distributions measured in the single inclusive jet production in proton-proton collisions pp → jet+X at the LHC. We consider both standard ungroomed jets as well as soft drop groomed jets. Within the Soft Collinear Effective Theory (SCET), we establish QCD factorization theorems for both cases and we study their relation. The developed framework allows...

Dark matter casts light on the early Universe

Abstract We show how knowledge of the cold dark matter (CDM) density can be used, in conjunction with measurements of the parameters of a scenario for beyond the Standard Model (BSM) physics, to provide information about the evolution of the Universe before Big Bang Nucleosynthesis (BBN). As examples of non-standard evolution, we consider models with a scalar field that may decay...

Skyrmions around Kerr black holes and spinning BHs with Skyrme hair

Abstract We study solutions of the Einstein-Skyrme model. Firstly we consider test field Skyrmions on the Kerr background. These configurations — hereafter dubbed Skerrmions — can be in equilibrium with a Kerr black hole (BH) by virtue of a synchronisation condition. We consider two sectors for Skerrmions. In the sector with non-zero baryon charge, Skerrmions are akin to the...

Effective field theory for chaotic CFTs

Abstract We derive an effective field theory for general chaotic two-dimensional conformal field theories with a large central charge. The theory is a specific and calculable instance of a more general framework recently proposed in [1]. We discuss the gauge symmetries of the model and how they relate to the Lyapunov behaviour of certain correlators. We calculate the out-of-time...

Conservation of asymptotic charges from past to future null infinity: Maxwell fields

Abstract On any asymptotically-flat spacetime, we show that the asymptotic symmetries and charges of Maxwell fields on past null infinity can be related to those on future null infinity as recently proposed by Strominger. We extend the covariant formalism of Ashtekar and Hansen by constructing a 3-manifold of both null and spatial directions of approach to spatial infinity. This...

Explanation of IceCube spectrum with ν → 3ν neutrino splitting in a ν2HDM model

Abstract A single power law flux spectrum of high energy neutrinos does not adequately explain the entire 60 TeV to 10 PeV event spectrum observed at IceCube, specially the excess of PeV events and the lack of Glashow resonance events expected at 6.3 PeV cannot be simultaneously explained by a single power law source neutrino flux. Here we consider a model of neutrino splitting...

Boosting $$H\to b\overline{b}$$ with machine learning

Abstract High-pT Higgs production at hadron colliders provides a direct probe of the internal structure of the gg → H loop with the $$H\to b\overline{b}$$ decay offering the most statistics due to the large branching ratio. Despite the overwhelming QCD background, recent advances in jet substructure have put the observation of the $$gg\to H\to b\overline{b}$$ channel at the...

Solving and classifying the solutions of the Yang-Baxter equation through a differential approach. Two-state systems

Abstract The formal derivatives of the Yang-Baxter equation with respect to its spectral parameters, evaluated at some fixed point of these parameters, provide us with two systems of differential equations. The derivatives of the R matrix elements, however, can be regarded as independent variables and eliminated from the systems, after which two systems of polynomial equations...

From rarefied elliptic beta integral to parafermionic star-triangle relation

Abstract We consider the rarefied elliptic beta integral in various limiting forms. In particular, we obtain an integral identity for parafermionic hyperbolic gamma functions which describes the star-triangle relation for parafermionic Liouville theory.

Superconformal index of higher derivative $$\mathcal{N}=1$$ multiplets in four dimensions

Abstract Supersymmetric partition function of $$\mathcal{N}=1$$ superconformal theories on S β 1  × S3 is related to the superconformal index receiving contributions from short representations. The leading coefficients in the small β (high “temperature”) expansion of the index were previously related to the conformal anomaly coefficients of the theory. Assumptions underlying...

Loop-induced neutrino non-standard interactions

Abstract Non-Standard Interactions (NSI) of neutrinos may originate from models in which new particles interact with neutrinos. In scalar extensions of the SM, the typical approach to obtain NSI requires Fierz transformations and charged Higgses, which suffer from strong constraints from collider searches or charged lepton flavor violation processes. We propose here an...

Combined explanations of B-physics anomalies: the sterile neutrino solution

Abstract In this paper we provide a combined explanation of charged- and neutral-current B-physics anomalies assuming the presence of a light sterile neutrino NR which contributes to the B → D(*)τν processes. We focus in particular on two simplified models, where the mediator of the flavour anomalies is either a vector leptoquark U 1 μ ∼ (3, 1, 2/3) or a scalar leptoquark S1...