2,791 research outputs found
Constraints on large-extra-dimensions model through 125 GeV Higgs pair production at the LHC
Based on the analysis of 5 fb^-1 of data at the LHC, the ATLAS and CMS
collaborations have presented evidence for a Higgs boson with a mass in the 125
GeV range. We consider the 125 GeV neutral Higgs pair production process in the
context of large-extra-dimensions (LED) model including the Kaluza-Klein
(KK)excited gravitons at the LHC. We consider the standard model(SM) Higgs pair
production in gluon-gluon fusion channel and pure LED effects through graviton
exchange as well as their interferences. It is shown that such interferences
should be included; the LED model raises the transverse momentum (Pt)and
invariant mass (M_HH) distributions at high scales of Pt and M_HH of the Higgs
pair production. By using the Higgs pair production we could set the discovery
limit on the cutoff scale M_S up to 6 TeV for delta = 2 and 4.5 TeV for delta =
6.Comment: 6 figure
Suppression of maximal linear gluon polarization in angular asymmetries
We perform a phenomenological analysis of the azimuthal
asymmetry in virtual photon plus jet production induced by the linear
polarization of gluons in unpolarized collisions. Although the linearly
polarized gluon distribution becomes maximal at small , TMD evolutionleads
to a Sudakov suppression of the asymmetry with increasing invariant mass of the
-jet pair. Employing a small- model input distribution, the
asymmetry is found to be strongly suppressed under TMD evolution, but still
remains sufficiently large to be measurable in the typical kinematical region
accessible at RHIC or LHC at moderate photon virtuality, whereas it is expected
to be negligible in -jet pair production at LHC. We point out the optimal
kinematics for RHIC and LHC studies, in order to expedite the first
experimental studies of the linearly polarized gluon distribution through this
process. We further argue that this is a particularly clean process to test the
-resummation formalism in the small- regime.Comment: 11 pages, 6 figure
Scale evolution of T-odd gluon TMDs at small x
We study the energy or TMD evolution of the three leading twist dipole type
T-odd gluon TMDs inside a transversely polarized nucleon, all of which at small
dynamically originate from the spin dependent odderon. Their energy
dependence presents a unique opportunity to study the polarization dependent
TMD evolution in the small- region, where the distributions are identical up
to a normalization constant at tree level. We further propose to study their
evolution via azimuthal asymmetries in virtual photon-jet production in
polarized proton-proton collisions at RHIC. We present model predictions for
the asymmetries as functions of the large jet or photon transverse momentum and
which set the hard scales in this process.Comment: 9 pages,4 figure
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