Journal of High Energy Physics

http://link.springer.com/journal/13130

List of Papers (Total 10,859)

Constraints on anharmonic corrections of fuzzy dark matter

Abstract The cold dark matter (CDM) scenario has proved successful in cosmology. However, we lack a fundamental understanding of its microscopic nature. Moreover, the apparent disagreement between CDM predictions and subgalactic-structure observations has prompted the debate about its behaviour at small scales. These problems could be alleviated if the dark matter is composed of...

Reheating neutron stars with the annihilation of self-interacting dark matter

Abstract Compact stellar objects such as neutron stars (NS) are ideal places for capturing dark matter (DM) particles. We study the effect of self-interacting DM (SIDM) captured by nearby NS that can reheat it to an appreciated surface temperature through absorbing the energy released due to DM annihilation. When DM-nucleon cross section σχn is small enough, DM self-interaction...

The β-function for Yukawa theory at large Nf

Abstract We compute the β-function for a massless Yukawa theory in a closed form at the order \( \mathcal{O}\left(1/{N}_f\right) \) in the spirit of the expansion in a large number of flavours Nf . We find an analytic expression with a finite radius of convergence, and the first singularity occurs at the coupling value K = 3.

Flavourful Z′ portal for vector-like neutrino dark matter and \( {R}_{K^{\left(*\right)}} \)

Abstract We discuss a flavourful Z′ portal model with a coupling to fourth-family singlet Dirac neutrino dark matter. In the absence of mixing, the Z′ is fermiophobic, having no couplings to the three chiral families, but does couple to a fourth vector-like family. Due to mixing effects, the Z′ gets induced couplings to second family left-handed lepton doublets and third family...

A realistic U(2) model of flavor

Abstract We propose a simple U(2) model of flavor compatible with an SU(5) GUT structure. All hierarchies in fermion masses and mixings arise from powers of two small parameters that control the U(2) breaking. In contrast to previous U(2) models this setup can be realized without supersymmetry and provides an excellent fit to all SM flavor observables including neutrinos. We also...

A flavoured dark sector

Abstract We explore the phenomenology of a QCD-like dark sector which confines around the GeV scale. The dark sector inherits a flavour structure from a coupling between dark quarks and SM quarks via a heavy mediator, which leads to exciting new phenomena. While stable baryonic bound states are the dark matter candidates, the phenomenology is dominated by the lightest composite...

Sharing but not caring: collider phenomenology

Abstract Based on a previous work on scenarios where the Standard Model and dark matter particles share a common asymmetry through effective operators at early time in the Universe and later on decouple from each other (not care), in this work, we study in detail the collider phenomenology of these scenarios. In particular, we use the experimental results from the Large Hadron...

The large charge expansion at large N

Abstract The scaling dimensions of charged operators in conformal field theory have recently been predicted to exhibit universal behavior in the large charge limit. We verify this behavior in the 2+1 dimensional ℂPN − 1 model. Specifically, we numerically compute the scaling dimensions of the lowest dimension monopole operators with charges Q = 1, 2, · · · , 100 to subleading...

Equations of motion from Cederwall’s pure spinor superspace actions

Abstract Using non-minimal pure spinor superspace, Cederwall has constructed BRST-invariant actions for D = 10 super-Born-Infeld and D = 11 supergravity which are quartic in the superfields. But since the superfields have explicit dependence on the non-minimal pure spinor variables, it is non-trivial to show these actions correctly describe super-Born-Infeld and supergravity. In...

Renormalization group properties in the conformal sector: towards perturbatively renormalizable quantum gravity

Abstract The Wilsonian renormalization group (RG) requires Euclidean signature. The conformal factor of the metric then has a wrong-sign kinetic term, which has a profound effect on its RG properties. Generically for the conformal sector, complete flows exist only in the reverse direction (i.e. from the infrared to the ultraviolet). The Gaussian fixed point supports infinite...

Search for disappearing tracks as a signature of new long-lived particles in proton-proton collisions at \( \sqrt{s}=13 \) TeV

Abstract A search is presented for long-lived charged particles that decay within the CMS detector and produce the signature of a disappearing track. A disappearing track is an isolated track with missing hits in the outer layers of the silicon tracker, little or no energy in associated calorimeter deposits, and no associated hits in the muon detectors. This search uses data...

Elliptic symbol calculus: from elliptic polylogarithms to iterated integrals of Eisenstein series

Abstract We present a generalization of the symbol calculus from ordinary multiple polylogarithms to their elliptic counterparts. Our formalism is based on a special case of a coaction on large classes of periods that is applied in particular to elliptic polylogarithms and iterated integrals of modular forms. We illustrate how to use our formalism to derive relations among...

Measurement of the cross section for top quark pair production in association with a W or Z boson in proton-proton collisions at \( \sqrt{s}=13 \) TeV

Abstract A measurement is performed of the cross section of top quark pair production in association with a W or Z boson using proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb−1, collected by the CMS experiment in 2016. The measurement is performed in the same-sign dilepton, three- and...

Curious aspects of three-dimensional \( \mathcal{N}=1 \) SCFTs

Abstract We study the dynamics of certain 3d \( \mathcal{N}=1 \) time reversal invariant theories. Such theories often have exact moduli spaces of supersymmetric vacua. We propose several dualities and we test these proposals by comparing the deformations and supersymmetric ground states. First, we consider a theory where time reversal symmetry is only emergent in the infrared...

Confining solitons in the Higgs phase of ℂP N −1 model: self-consistent exact solutions in large-N limit

Abstract The quantum ℂP N −1 model is in the confining (or unbroken) phase with a full mass gap in an infinite space, while it is in the Higgs (broken or deconfinement) phase accompanied with Nambu-Goldstone modes in a finite space such as a ring or finite interval smaller than a certain critical size. We find a new self-consistent exact solution describing a soliton in the Higgs...

Magnetically-charged supersymmetric flows of gauged \( \mathcal{N}=8 \) supergravity in five dimensions

Abstract We study magnetically-charged supersymmetric flow equations in a consistent truncation of gauged \( \mathcal{N}=8 \) supergravity in five dimensions. This truncation gives gauged \( \mathcal{N}=2 \) supergravity coupled to two vector multiplets and two hypermultiplets. We derive magnetically-charged flow equations of scalar fields from vector and hypermultiplets. It...

Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at \( \sqrt{s}=13 \) TeV with the ATLAS detector

Abstract A search for flavour-changing neutral-current processes in top-quark decays is presented. Data collected with the ATLAS detector from proton-proton collisions at the Large Hadron Collider at a centre-of-mass energy of \( \sqrt{s}=13 \) TeV, corresponding to an integrated luminosity of 36.1 fb−1, are analysed. The search is performed using top-quark pair events, with one...

BFKL spectrum of \( \mathcal{N} \) = 4: non-zero conformal spin

Abstract We developed a general non-perturbative framework for the BFKL spectrum of planar \( \mathcal{N} \) = 4 SYM, based on the Quantum Spectral Curve (QSC). It allows one to study the spectrum in the whole generality, extending previously known methods to arbitrary values of conformal spin n. We show how to apply our approach to reproduce all known perturbative results for...

Precise prediction of the MSSM Higgs boson masses for low MA

Abstract Precise predictions for Higgs boson masses in the Minimal Supersymmetric Standard Model can be obtained by combining fixed-order calculations with effective field theory (EFT) methods for the resummation of large logarithms in case of heavy super-partners. This hybrid approach is implemented in the computer code FeynHiggs and has been applied in previous studies for...

Vacuum fluctuations of a scalar field near a reflecting boundary and their effects on the motion of a test particle

Abstract The contribution from quantum vacuum fluctuations of a real massless scalar field to the motion of a test particle that interacts with the field in the presence of a perfectly reflecting flat boundary is here investigated. There is no quantum induced dispersions on the motion of the particle when it is alone in the empty space. However, when a reflecting wall is...

Flat holography and Carrollian fluids

Abstract We show that a holographic description of four-dimensional asymptotically locally flat spacetimes is reached smoothly from the zero-cosmological-constant limit of anti-de Sitter holography. To this end, we use the derivative expansion of fluid/gravity correspondence. From the boundary perspective, the vanishing of the bulk cosmological constant appears as the zero...

A variant of 3-3-1 model for the generation of the SM fermion mass and mixing pattern

Abstract We propose an extension of the 3-3-1 model with an additional symmetry group \( {Z}_2\times {Z}_4\times \mathrm{U}{(1)}_{L_g} \) and an extended scalar sector. To our best knowledge this is the first example of a renormalizable 3-3-1 model, which allows explanation the SM fermion mass hierarchy by a sequential loop suppression: tree-level top and exotic fermion masses, 1...

One-loop quantization of rigid spinning strings in AdS3 × S3 × T 4 with mixed flux

Abstract We compute the one-loop correction to the classical dispersion relation of rigid closed spinning strings with two equal angular momenta in the AdS3 × S3 × T 4 background supported with a mixture of R-R and NS-NS three-form fluxes. This analysis is extended to the case of two arbitrary angular momenta in the pure NS-NS limit. We perform this computation by means of two...

Pseudo-Dirac neutrinos from flavour dependent CP symmetry

Abstract Discrete residual symmetries and flavour dependent CP symmetries consistent with them have been used to constrain neutrino mixing angles and CP violating phases. We discuss here role of such CP symmetries in obtaining a pseudo-Dirac neutrino which can provide a pair of neutrinos responsible for the solar splitting. It is shown that if (a) 3 × 3 Majorana neutrino matrix M...

Lorentz covariant form of extended higher-spin equations

Abstract The extension of nonlinear higher-spin equations in d = 4 proposed in [30] for the construction of invariant functional is shown to respect local Lorentz symmetry. The equations are rewritten in a manifestly Lorentz covariant form resulting from some Stueckelberg-like field transformation. We also show that the two field-independent central terms entering higher-spin...