2,969 research outputs found
Next-to-leading order predictions for WW + 1 jet distributions at the LHC
We present numerical results for the production of a pair in
association with a jet at the LHC in QCD at next-to-leading order (NLO). We
include effects of the decay of the massive vector bosons into leptons with
spin correlations and contributions from the third generation of massive
quarks. The calculation is performed using a semi-numerical method for the
virtual corrections, and is implemented in MCFM. In addition to its importance
{\it per se} as a test of the Standard Model, this process is an important
background to searches for the Higgs boson and to many new physics searches. As
an example, we study the impact of NLO corrections to jet production
on the search for a Higgs boson at the LHC.Comment: 21 pages, 9 figures; v3 published versio
Higgs Discovery through Top-Partners using Jet Substructure
Top-partners -- vector-like quarks which mix predominantly with the top quark
-- are simple extensions of the standard model present in many theories of new
physics such as little Higgs models, topcolor models, and extra dimensions.
Through renormalizable mixing with the top quark, these top-partners inherit
couplings to the Higgs boson. Higgs bosons produced from the decay of
top-partners are often highly boosted and ideal candidates for analyses based
on jet substructure. Using substructure methods, we show that light Higgs
bosons decaying to b b-bar can be discovered at the 14 TeV LHC with less than
10 inverse fb for top-partner masses up to 1 TeV.Comment: 11 pages, 7 figure
Edge pixel response studies of edgeless silicon sensor technology for pixellated imaging detectors
Silicon sensor technologies with reduced dead area at the sensor's perimeter are under development at a number of institutes. Several fabrication methods for sensors which are sensitive close to the physical edge of the device are under investigation utilising techniques such as active-edges, passivated edges and current-terminating rings. Such technologies offer the goal of a seamlessly tiled detection surface with minimum dead space between the individual modules. In order to quantify the performance of different geometries and different bulk and implant types, characterisation of several sensors fabricated using active-edge technology were performed at the B16 beam line of the Diamond Light Source. The sensors were fabricated by VTT and bump-bonded to Timepix ROICs. They were 100 and 200 Ό m thick sensors, with the last pixel-to-edge distance of either 50 or 100 Ό m. The sensors were fabricated as either n-on-n or n-on-p type devices. Using 15 keV monochromatic X-rays with a beam spot of 2.5 Ό m, the performance at the outer edge and corners pixels of the sensors was evaluated at three bias voltages. The results indicate a significant change in the charge collection properties between the edge and 5th (up to 275 Ό m) from edge pixel for the 200 Ό m thick n-on-n sensor. The edge pixel performance of the 100 Ό m thick n-on-p sensors is affected only for the last two pixels (up to 110 Ό m) subject to biasing conditions. Imaging characteristics of all sensor types investigated are stable over time and the non-uniformities can be minimised by flat-field corrections. The results from the synchrotron tests combined with lab measurements are presented along with an explanation of the observed effects
Radiation Hardness Studies in a CCD with High-Speed Column Parallel Readout
Charge Coupled Devices (CCDs) have been successfully used in several high
energy physics experiments over the past two decades. Their high spatial
resolution and thin sensitive layers make them an excellent tool for studying
short-lived particles. The Linear Collider Flavour Identification (LCFI)
collaboration is developing Column-Parallel CCDs (CPCCDs) for the vertex
detector of the International Linear Collider (ILC). The CPCCDs can be read out
many times faster than standard CCDs, significantly increasing their operating
speed. The results of detailed simulations of the charge transfer inefficiency
(CTI) of a prototype CPCCD are reported and studies of the influence of gate
voltage on the CTI described. The effects of bulk radiation damage on the CTI
of a CPCCD are studied by simulating the effects of two electron trap levels,
0.17 and 0.44 eV, at different concentrations and operating temperatures. The
dependence of the CTI on different occupancy levels (percentage of hit pixels)
and readout frequencies is also studied. The optimal operating temperature for
the CPCCD, where the effects of the charge trapping are at a minimum, is found
to be about 230 K for the range of readout speeds proposed for the ILC. The
results of the full simulation have been compared with a simple analytic model.Comment: 3 pages, 6 figures; presented at IEEE'07, ALCPG'07, ICATPP'0
Prospects for the Search for a Standard Model Higgs Boson in ATLAS using Vector Boson Fusion
The potential for the discovery of a Standard Model Higgs boson in the mass
range m_H < 2 m_Z in the vector boson fusion mode has been studied for the
ATLAS experiment at the LHC. The characteristic signatures of additional jets
in the forward regions of the detector and of low jet activity in the central
region allow for an efficient background rejection. Analyses for the H -> WW
and H -> tau tau decay modes have been performed using a realistic simulation
of the expected detector performance. The results obtained demonstrate the
large discovery potential in the H -> WW decay channel and the sensitivity to
Higgs boson decays into tau-pairs in the low-mass region around 120 GeV.Comment: 20 pages, 13 ps figures, uses EPJ style fil
Precision electroweak calculation of the production of a high transverse-momentum lepton pair at hadron colliders
We present a detailed study of the production of a high transverse-momentum
lepton pair at hadron colliders, which includes the exact O(alpha) electroweak
corrections properly matched with leading logarithmic effects due to multiple
photon emission, as required by the experiments at the Fermilab Tevatron and
the CERN LHC. Numerical results for the relevant observables of single Z-boson
production at hadron colliders are presented. The impact of the radiative
corrections is discussed in detail. The presence in the proton of a photon
density is considered and the effects of the photon-induced partonic
subprocesses are analyzed. The calculation has been implemented in the new
version of the event generator HORACE, which is available for precision
simulations of the neutral and charged current Drell-Yan processes.Comment: October 2007, 22p
On the phenomenology of a two-Higgs-doublet model with maximal CP symmetry at the LHC
Predictions for LHC physics are worked out for a two-Higgs-doublet model
having four generalized CP symmetries. In this maximally-CP-symmetric model
(MCPM) the first fermion family is, at tree level, uncoupled to the Higgs
fields and thus massless. The second and third fermion families have a very
symmetric coupling to the Higgs fields. But through the electroweak symmetry
breaking a large mass hierarchy is generated between these fermion families.
Thus, the fermion mass spectrum of the model presents a rough approximation to
what is observed in Nature. In the MCPM there are, as in every
two-Higgs-doublet model, five physical Higgs bosons, three neutral ones and a
charged pair. In the MCPM the couplings of the Higgs bosons to the fermions are
completely fixed. This allows us to present clear predictions for the
production at the LHC and for the decays of the physical Higgs bosons. As
salient feature we find rather large cross sections for Higgs-boson production
via Drell-Yan type processes. With experiments at the LHC it should be possible
to check these predictions.Comment: 17 pages, 14 figures, some clarifications added, typos correcte
A threshold-improved narrow-width approximation for BSM physics
A modified narrow-width approximation that allows for O(Gamma/M)-accurate
predictions for resonant particle decay with similar intermediate masses is
proposed and applied to MSSM processes to demonstrate its importance for
searches for particle physics beyond the Standard Model.Comment: 10 pages, 5 figures, version to appear in JHE
Dominant next-to-leading order QCD corrections to Higgs plus three jet production in vector-boson fusion
We present the calculation of the dominant next to leading order QCD
corrections to Higgs boson production in association with three jets via vector
boson fusion in the form of a NLO parton-level Monte Carlo program. QCD
corrections to integrated cross sections are modest, while the shapes of some
kinematical distributions change appreciably at NLO. Scale uncertainties are
shown to be reduced at NLO for the total cross section and for distributions.
We consider a central jet veto at the LHC and analyze the veto probability for
typical vector boson fusion cuts. Scale uncertainties of the veto probability
are sufficiently small at NLO for precise Higgs coupling measurements at the
LHC.Comment: 40 pages, 17 figures, 2 tables, published versio
- âŠ