Outputs (760)

CP violation and circular polarisation in neutrino radiative decay (2020)
Journal Article

The radiative decay of neutral fermions has been studied for decades but CP violation induced within such a paradigm has evaded attention. CP violation in these processes can produce an asymmetry between circularly polarised directions of the radiate... Read More about CP violation and circular polarisation in neutrino radiative decay.

Second order splitting functions and infrared safe cross sections in N = 4 SYM theory (2019)
Journal Article

We report our findings on the perturbative structure of N = 4 supersymmetric Yang-Mills (SYM) theory in the infrared sector by computing inclusive scattering cross sections of on-shell particles. We use half-BPS, energy-momentum tensor and Konishi op... Read More about Second order splitting functions and infrared safe cross sections in N = 4 SYM theory.

Finite quark-mass effects in Higgs boson production with dijets at large energies (2019)
Journal Article

The production of a Higgs boson in association with at least two jets receives contributions both from the fusion of weak vector bosons (VBF) and from QCD processes, especially gluon fusion (GF). The former process is important for measuring the coup... Read More about Finite quark-mass effects in Higgs boson production with dijets at large energies.

Soft drop (2014)
Journal Article

We introduce a new jet substructure technique called “soft drop declustering”, which recursively removes soft wide-angle radiation from a jet. The soft drop algorithm depends on two parameters — a soft threshold zcut and an angular exponent — with th... Read More about Soft drop.

Classical scale invariance in the inert doublet model (2015)
Journal Article

The inert doublet model (IDM) is a minimal extension of the Standard Model (SM) that can account for the dark matter in the universe. Naturalness arguments motivate us to study whether the model can be embedded into a theory with dynamically generate... Read More about Classical scale invariance in the inert doublet model.

Selectron NLSP in gauge mediation (2014)
Journal Article

We discuss gauge mediation models in which the smuon and the selectron are mass-degenerate co-NLSP, which we, for brevity, refer to as selectron NLSP. In these models, the stau, as well as the other superpartners, are parametrically heavier than the... Read More about Selectron NLSP in gauge mediation.

Heavy charged Higgs boson production at the LHC (2015)
Journal Article

In this paper we study the production of a heavy charged Higgs boson in association with heavy quarks at the LHC in the two-Higgs-doublet model. We present for the first time fully-differential results obtained in the four-flavour scheme at NLO accur... Read More about Heavy charged Higgs boson production at the LHC.

Towards 2+4 formulation of M5-brane (2015)
Journal Article

We present an attempt to formulate an action for the worldvolume theory of a single M5-brane, based on the splitting of the six worldvolume directions into 2+4, which breaks manifest Lorentz invariance from SO(1; 5) to SO(1; 1) SO(4). To this end, an... Read More about Towards 2+4 formulation of M5-brane.

Charm production in the forward region: constraints on the small-x gluon and backgrounds for neutrino astronomy (2015)
Journal Article

The recent observation by the IceCube experiment of cosmic neutrinos at energies up to a few PeV heralds the beginning of neutrino astronomy. At such high energies, the ‘conventional’ neutrino flux is suppressed and the ‘prompt’ component from charm... Read More about Charm production in the forward region: constraints on the small-x gluon and backgrounds for neutrino astronomy.

Impact of semi-annihilation of ℤ3symmetric dark matter with radiative neutrino masses (2014)
Journal Article

We investigate a Bbb Z3 symmetric model with two-loop radiative neutrino masses. Dark matter in the model is either a Dirac fermion or a complex scalar as a result of an unbroken Bbb Z3 symmetry. In addition to standard annihilation processes, semi-a... Read More about Impact of semi-annihilation of ℤ3symmetric dark matter with radiative neutrino masses.

Non-planar on-shell diagrams (2015)
Journal Article

We initiate a systematic study of non-planar on-shell diagrams in N=4 SYM and develop powerful technology for doing so. We introduce canonical variables generalizing face variables, which make the d log form of the on-shell form explicit. We make sig... Read More about Non-planar on-shell diagrams.

Sudakov effects in photon-initiated processes (2016)
Journal Article

We consider the effect of the Sudakov factor in photon-initiated processes, corresponding to the no branching probability for the initial-state photon. We demonstrate how such a factor follows simply from the solution of the DGLAP equation for the ph... Read More about Sudakov effects in photon-initiated processes.

Dark D-brane cosmology (2014)
Journal Article

Disformally coupled cosmologies arise from Dirac-Born-Infeld actions in Type II string theories, when matter resides on a moving hidden sector D-brane. Since such matter interacts only very weakly with the standard model particles, this scenario can... Read More about Dark D-brane cosmology.

3.55 keV X-ray line signal from excited dark matter in radiative neutrino model (2014)
Journal Article

We study an exciting dark matter scenario in a radiative neutrino model to explain the X-ray line signal at recently reported by XMN-Newton X-ray observatory using data of various galaxy clusters and Andromeda galaxy. We show that the required large... Read More about 3.55 keV X-ray line signal from excited dark matter in radiative neutrino model.

BFKL equation for an integrated gluon density (2014)
Journal Article

We show how it is possible to rewrite the BFKL equation for the unintegrated gluon distribution, in terms of integrated gluons, similar to that used in DGLAP. We add to our equation the next-to-leading log terms which provide exact energy-momentum co... Read More about BFKL equation for an integrated gluon density.

One-loop amplitudes in AdS5×S5 supergravity from N = 4 SYM at strong coupling (2020)
Journal Article

We explore the structure of maximally supersymmetric Yang-Mills correlators in the supergravity regime. We develop an algorithm to construct one-loop supergravity amplitudes of four arbitrary Kaluza-Klein supergravity states, properly dualised into s... Read More about One-loop amplitudes in AdS5×S5 supergravity from N = 4 SYM at strong coupling.

Inclusive prompt $$\chi _{c,b}(1^{++})$$ χ c , b ( 1 + + ) production at the LHC (2015)
Journal Article

We study the prompt production of the χc(1+) and χb(1+) mesons at high energies. Unlike χ(0+,2+) production, χ(1+) mesons cannot be created at LO via the fusion of two on-mass-shell gluons, that is, gg→χc,b(1+) are not allowed. However, the available... Read More about Inclusive prompt $$\chi _{c,b}(1^{++})$$ χ c , b ( 1 + + ) production at the LHC.

Dark-matter production through loop-induced processes at the LHC: the s-channel mediator case (2015)
Journal Article

We show how studies relevant for mono-X searches at the LHC in simplified models featuring a dark-matter candidate and an s-channel mediator can be performed within the MadGraph5_aMC@NLO framework. We focus on gluon-initiated loop-induced processes,... Read More about Dark-matter production through loop-induced processes at the LHC: the s-channel mediator case.

Radiative lepton model and dark matter with global U(1)′symmetry (2014)
Journal Article

We propose a radiative lepton model, in which the charged lepton masses are generated at one-loop level, and the neutrino masses are induced at two-loop level. On the other hand, tau mass is derived at tree level since it is too heavy to generate rad... Read More about Radiative lepton model and dark matter with global U(1)′symmetry.

Modelling exclusive meson pair production at hadron colliders (2014)
Journal Article

We present a study of the central exclusive production of light meson pairs, concentrating on the region of lower invariant masses of the central system and/or meson transverse momentum, where perturbative QCD cannot be reliably applied. We describe... Read More about Modelling exclusive meson pair production at hadron colliders.