Journal of High Energy Physics

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

List of Papers (Total 10,064)

Superstring amplitudes and the associator

We investigate a pattern in the α′ expansion of tree-level open superstring amplitudes which correlates the appearance of higher depth multiple zeta values with that of simple zeta values in a particular way. We rephrase this relationship in terms of the coaction on motivic multiple zeta values and show that the pattern takes a very simple form, which can be simply explained by ...

Leading singularities and off-shell conformal integrals

The three-loop four-point function of stress-tensor multiplets in \( \mathcal{N}=4 \) super Yang-Mills theory contains two so far unknown, off-shell, conformal integrals, in addition to the known, ladder-type integrals. In this paper we evaluate the unknown integrals, thus obtaining the three-loop correlation function analytically. The integrals have the generic structure of ...

Differential branching fraction and angular analysis of the decay B 0 → K ∗0 μ + μ −

The angular distribution and differential branching fraction of the decay B 0→ K ∗0 μ + μ − are studied using a data sample, collected by the LHCb experiment in pp collisions at \( \sqrt{s}=7 \) TeV, corresponding to an integrated luminosity of 1.0 fb−1. Several angular observables are measured in bins of the dimuon invariant mass squared, q 2. A first measurement of the ...

Learning how to count: a high multiplicity search for the LHC

We introduce a search technique that is sensitive to a broad class of signals with large final state multiplicities. Events are clustered into large radius jets and jet substructure techniques are used to count the number of subjets within each jet. The search consists of a cut on the total number of subjets in the event as well as the summed jet mass and missing energy. Two ...

Coset conformal field theory and instanton counting on ℂ2/ℤ p

We study conformal field theory with the symmetry algebra \( \mathcal{A}\left( {2,\ p} \right)={{{\widehat{\mathfrak{gl}}{(n)_2}}} \left/ {{\widehat{\mathfrak{gl}}{{{\left( {n-p} \right)}}_2}}} \right.} \). In order to support the conjecture that this algebra acts on the moduli space of instantons on ℂ2/ℤ p , we calculate the characters of its representations and check their ...

Eigenvectors and scalar products for long range interacting spin chains II: the finite size effects

In this note, we study the eigenvectors and the scalar products the integrable long-range deformation of the XXX spin chain defined in [1]. The model is solved exactly by algebraic Bethe ansatz, and it coincides in the bulk with the Inozemtsev spin chain. At the closing point it contains a defect which effectively removes the wrapping interactions. Here we concentrate on ...

BPS black holes in AdS 4 from M-theory

We study supersymmetric black holes in AdS 4 in the framework of four dimensional gauged \( \mathcal{N}=2 \) supergravity coupled to hypermultiplets. We derive the flow equations for a general electrically gauged theory where the gauge group is Abelian and, restricting them to the fixed points, we derive the gauged supergravity analogue of the attractor equations for theories ...

Controlling inclusive cross sections in parton shower + matrix element merging

We propose an extension of matrix element plus parton shower merging at tree level to preserve inclusive cross sections obtained from the merged and showered sample. Implementing this constraint generates approximate next-to-leading order (NLO) contributions similar to the LoopSim approach. We then show how full NLO, or in principle even higher order, corrections can be added ...

Simulation of electron-positron annihilation into hadrons with the event generator PHOKHARA

The precise determination of the cross section for electron-positron annihilation into hadrons is one of the central tasks of ongoing experiments at low energy colliders. These measurements have to be complemented by Monte Carlo generators which simulate a large number of final states and include higher order radiative corrections. With this motivation in mind the generator ...

Measurement of B meson production cross-sections in proton-proton collisions at \( \sqrt{s}=7 \) TeV

The production cross-sections of B mesons are measured in pp collisions at a centre-of-mass energy of 7 TeV, using data collected with the LHCb detector corresponding to a integrated luminosity of 0.36 fb−1. The B +, B 0 and \( B_s^0 \) mesons are reconstructed in the exclusive decays B + → J/ψK +, B 0 → J/ψK *0 and \( B_s^0\to {J \left/ {{\psi \phi }} \right.} \), with J/ψ → μ + μ ...

3d dualities from 4d dualities for orthogonal groups

We extend recent work on the relation of 4d and 3d IR dualities of supersymmetric gauge theories with four supercharges to the case of orthogonal gauge groups. The distinction between different SO(N) gauge theories in 4d plays an important role in this relation. We show that the 4d duality leads to a 3d duality between an SO(N c ) gauge theory with N f flavors and an SO(N f − N c + ...

Stringy membranes in AdS/CFT

We study membrane configurations in AdS7/4 × S 4/7. The membranes are wrapped around the compact manifold S 4/7 and are dynamically equivalent to bosonic strings in AdS5. We thus conveniently identify them as “stringy membranes”. For the case of AdS7 × S 4, their construction is carried out by embedding the Polyakov action for classical bosonic strings in AdS5, into the ...

Light stops, light staus and the 125 GeV Higgs

The ATLAS and CMS experiments have recently announced the discovery of a Higgs-like resonance with mass close to 125 GeV. Overall, the data is consistent with a Standard Model (SM)-like Higgs boson. Such a particle may arise in the minimal super-symmetric extension of the SM with average stop masses of the order of the TeV scale and a sizable stop mixing parameter. In this article ...

Buckets of tops

Reconstructing hadronically decaying top quarks is a key challenge at the LHC, affecting a long list of Higgs analyses and new physics searches. We propose a new method of collecting jets in buckets, corresponding to top quarks and initial state radiation. This method is particularly well suited for moderate transverse momenta of the top quark, closing the gap between top taggers ...

Higgs pair production in the NMSSM at the LHC

In the NMSSM it is well possible to find an additional Higgs boson with a mass below 125 GeV which remains invisible in standard Higgs boson search channels. We study the Higgs pair production cross sections times branching fractions in this scenario, focussing on gluon fusion and the \( b\overline{b} \) + τ + τ − and \( b\overline{b} \) + γγ final states. Summing over the SM-like ...

Leptonic dynamical Yukawa couplings

A dynamical origin of the Yukawa couplings is a promising scenario to explain the flavour puzzle. The focus of this letter is set on the role of the neutrino Majorana character: when an O(2)N flavour symmetry acts on the right-handed neutrino sector, the minimum of the scalar potential allows for large mixing angles -in contrast to the simplest quark case- and predicts a maximal ...

Some aspects of self-duality and generalised BPS theories

If a scalar field theory in (1+1) dimensions possesses soliton solutions obeying first order BPS equations, then, in general, it is possible to find an infinite number of related field theories with BPS solitons which obey closely related BPS equations. We point out that this fact may be understood as a simple consequence of an appropriately generalised notion of self-duality. We ...

SOX: Short distance neutrino Oscillations with BoreXino

The very low radioactive background of the Borexino detector, its large size, and the well proved capability to detect both low energy electron neutrinos and antineutrinos make an ideal case for the study of short distance neutrino oscillations with artificial sources at Gran Sasso. This paper describes the possible layouts of 51Cr (ν e ) and 144Ce-144Pr \( \left( ...

Renormalization of dimension-six operators relevant for the Higgs decays h → γγ, γZ

The discovery of the Higgs boson has opened a new window to test the SM through the measurements of its couplings. Of particular interest is the measured Higgs coupling to photons which arises in the SM at the one-loop level, and can then be significantly affected by new physics. We calculate the one-loop renormalization of the dimension- six operators relevant for h → γγ, γZ, ...

A non supersymmetric SO(10) grand unified model for all the physics below M GUT

We present a renormalizable non supersymmetric Grand Unified SO(10) model which, at the price of a large fine tuning, is compatible with all compelling phenomenological requirements below the unification scale and thus realizes a minimal extension of the SM, unified in SO(10) and describing all known physics below M GUT. These requirements include coupling unification at a large ...

BPS states and their reductions

We develop a method to identify the BPS states in the Hilbert space of a supersymmetric field theory on a generic curved space which preserves at least two real supercharges. We also propose a one-to-one map between BPS states in d-dimensional field theories and states that contribute to the supersymmetric partition function of a corresponding (d − 1)-dimensional field theory. As ...

Diagonal limit for conformal blocks in d dimensions

Conformal blocks in any number of dimensions depend on two variables z, \( \overline{z} \). Here we study their restrictions to the special “diagonal” kinematics \( z=\overline{z} \), previously found useful as a starting point for the conformal bootstrap analysis. We show that conformal blocks on the diagonal satisfy ordinary differential equations, third-order for spin zero and ...

Strong signatures of right-handed compositeness

Right-handed light quarks could be significantly composite, yet compatible with experimental searches at the LHC and precision tests on Standard Model couplings. In these scenarios, that are motivated by flavor physics, one expects large cross sections for the production of new resonances coupled to light quarks. We study experimental strong signatures of right-handed compositeness ...

Duality covariant multi-centre black hole systems

We present a manifestly duality covariant formulation of the composite nonBPS and almost-BPS systems of multi-centre black hole solutions in four dimensions. The method of nilpotent orbits is used to define the two systems in terms of first order flow equations that transform covariantly under the duality group. Subsequently, we rewrite both systems of equations in terms of real, ...

W and Z bosons in association with two jets using the POWHEG method

In this work we present the implementation of generators for W and Z bosons in association with two jets interfaced to parton showers using the POWHEG BOX method. We incorporate matrix elements from the parton-level Monte Carlo program MCFM in the POWHEG-BOX, allowing for a considerable improvement in speed compared to previous implementations. We address certain problems that ...