Outputs (1184)

Precision Determination of the Small-x Gluon from Charm Production at LHCb (2017)
Journal Article

The small-x gluon in global fits of parton distributions is affected by large uncertainties from the lack of direct experimental constraints. In this Letter, we provide a precision determination of the small-x gluon from the exploitation of forward c... Read More about Precision Determination of the Small-x Gluon from Charm Production at LHCb.

Tagging a monotop signature in natural SUSY (2017)
Journal Article

We study the feasibility of probing a region of natural supersymmetry where the stop and Higgsino masses are compressed. Although this region is most effectively searched for in the monojet channel, this signature is present in many other nonsupersym... Read More about Tagging a monotop signature in natural SUSY.

Redefining the Axion Window (2017)
Journal Article

A major goal of axion searches is to reach inside the parameter space region of realistic axion models. Currently, the boundaries of this region depend on somewhat arbitrary criteria, and it would be desirable to specify them in terms of precise phen... Read More about Redefining the Axion Window.

Direct Photon Production at Next-to–Next-to-Leading Order (2017)
Journal Article

We present the first calculation of direct photon production at next-to-next-to-leading order (NNLO) accuracy in QCD. For this process, although the final-state cuts mandate only the presence of a single electroweak boson, the underlying kinematics r... Read More about Direct Photon Production at Next-to–Next-to-Leading Order.

Multi-particle amplitudes from the four-point correlator in planar N = 4 SYM (2018)
Journal Article

A non-trivial consequence of the super-correlator/super-amplitude duality is that the integrand of the four-point correlation function of stress-tensor multiplets in planar N = 4 super Yang-Mills contains a certain combination of n-point amplitude in... Read More about Multi-particle amplitudes from the four-point correlator in planar N = 4 SYM.

Holographic DC conductivity and Onsager relations (2017)
Journal Article

Within holography the DC conductivity can be obtained by solving a system of Stokes equations for an auxiliary fluid living on the black hole horizon. We show that these equations can be derived from a novel variational principle involving a function... Read More about Holographic DC conductivity and Onsager relations.

Five-loop quark mass and field anomalous dimensions for a general gauge group (2017)
Journal Article

We present analytical five-loop results for the quark mass and quark field anomalous dimensions, for a general gauge group and in the MS scheme. We confirm the values known for the gauge group SU(3) from an independent calculation, and find full agre... Read More about Five-loop quark mass and field anomalous dimensions for a general gauge group.

Diffusion and chaos from near AdS2 horizons (2017)
Journal Article

We calculate the thermal diffusivity D = κ/cρ and butterfly velocity vB in holographic models that flow to AdS2 × Rd fixed points in the infra-red. We show that both these quantities are governed by the same irrelevant deformation of AdS2 and hence e... Read More about Diffusion and chaos from near AdS2 horizons.

LHC multijet events as a probe for anomalous dimension-six gluon interactions (2017)
Journal Article

Higher-dimensional multigluon interactions affect essentially all effective Lagrangian analyses at the LHC. We show that, contrary to common lore, such operators are best constrained in multijet production. Our limit on the corresponding new physics... Read More about LHC multijet events as a probe for anomalous dimension-six gluon interactions.

Astrophobic Axions (2018)
Journal Article

We propose a class of axion models with generation-dependent Peccei-Quinn charges for the known fermions that allow one to suppress the axion couplings to nucleons and electrons. Astrophysical limits are thus relaxed, allowing for axion masses up to... Read More about Astrophobic Axions.

New worldsheet formulae for conformal supergravity amplitudes (2018)
Journal Article

We use 4d ambitwistor string theory to derive new worldsheet formulae for tree-level conformal supergravity amplitudes supported on refined scattering equations. Unlike the worldsheet formulae for super-Yang-Mills or supergravity, the scattering equa... Read More about New worldsheet formulae for conformal supergravity amplitudes.

A multi-threaded version of MCFM (2015)
Journal Article

We report on our findings modifying MCFM using OpenMP to implement multi-threading. By using OpenMP, the modified MCFM will execute on any processor, automatically adjusting to the number of available threads. We modified the integration routine VEGA... Read More about A multi-threaded version of MCFM.

Top-quark processes at NLO in production and decay (2014)
Journal Article

We describe the implementation of top production and decay processes in the parton-level Monte Carlo program MCFM. By treating the top quark as being on-shell, we can factorize the amplitudes for top-pair production, s-channel single-top production,... Read More about Top-quark processes at NLO in production and decay.

Color-singlet production at NNLO in MCFM (2016)
Journal Article

We present the implementation of several color-singlet final-state processes at Next-to-Next-to Leading Order (NNLO) accuracy in QCD to the publicly available parton-level Monte Carlo program MCFM. Specifically we discuss the processes pp→Hpp→H , pp→... Read More about Color-singlet production at NNLO in MCFM.

Multiparticle production in the large λn limit: realising Higgsplosion in a scalar QFT (2017)
Journal Article

In a scalar theory which we use as a simplified model for the Higgs sector, we adopt the semiclassical formalism of Son for computations of n-particle production cross-sections in the high-multiplicity n → ∞ weak-coupling λ → 0 regime with the value... Read More about Multiparticle production in the large λn limit: realising Higgsplosion in a scalar QFT.

Jet-associated resonance spectroscopy (2017)
Journal Article

We present a model-independent study aimed at characterising the nature of possible resonances in the jetphoton or jet-Z final state at hadron colliders. Such resonances are expected in many models of compositeness and would be a clear indication of... Read More about Jet-associated resonance spectroscopy.

Type-II Seesaw Model and Multilepton Signatures at Hadron Colliders (2017)
Journal Article

We investigate multilepton signatures, arising from the decays of doubly charged and singly charged Higgs bosons in the Type II seesaw model. Depending on the vacuum expectation value of the triplet vΔ, the doubly and singly charged Higgs bosons can... Read More about Type-II Seesaw Model and Multilepton Signatures at Hadron Colliders.

χc decays and the gluon component of the η′, η mesons (2017)
Journal Article

The large mass of the η′ meson indicates that a sizeable gluon component is present in the meson wave function. However, the χc0 and χc2 decays to η′ mesons, which proceed via a purely gluonic intermediate state and we would therefore naïvely expect... Read More about χc decays and the gluon component of the η′, η mesons.

Thermal backflow in CFTs (2017)
Journal Article

We study the thermal transport properties of general conformal field theories (CFTs) on curved spacetimes in the leading order viscous hydrodynamic limit. At the level of linear response, we show that the thermal transport is governed by a system of... Read More about Thermal backflow in CFTs.

Cosmic dance at z ~ 3: Detecting the host galaxies of the dual AGN system LBQS 0302–0019 and Jil with HAWK-I+GRAAL (2018)
Journal Article

We recently discovered that the luminous radio-quiet quasi-stellar objects (QSO) LBQS 0302–0019 at z = 3.286 is likely accompanied by an obscured AGN at 20 kpc projected distance, which we dubbed Jil. It represents the tightest candidate system of an... Read More about Cosmic dance at z ~ 3: Detecting the host galaxies of the dual AGN system LBQS 0302–0019 and Jil with HAWK-I+GRAAL.