AbstractThe potential for the discovery of a Standard Model Higgs boson in the mass range mH < 2 mZ 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 → ττ 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 τ-pairs in the low-mass region around 120 GeV/c2.
► Prospects for DM searches with CTA at various targets. ► Prospects for ALP searches with CTA. ► Prospects for LIV searches with CTA. ► Prospects for neutrinos, magnetic monopoles and gravitational ...waves searches with CTA.
The Cherenkov Telescope Array (CTA) is a project for a next-generation observatory for very high energy (GeV–TeV) ground-based gamma-ray astronomy, currently in its design phase, and foreseen to be operative a few years from now. Several tens of telescopes of 2–3 different sizes, distributed over a large area, will allow for a sensitivity about a factor 10 better than current instruments such as H.E.S.S, MAGIC and VERITAS, an energy coverage from a few tens of GeV to several tens of TeV, and a field of view of up to 10°. In the following study, we investigate the prospects for CTA to study several science questions that can profoundly influence our current knowledge of fundamental physics. Based on conservative assumptions for the performance of the different CTA telescope configurations currently under discussion, we employ a Monte Carlo based approach to evaluate the prospects for detection and characterisation of new physics with the array.
First, we discuss CTA prospects for cold dark matter searches, following different observational strategies: in dwarf satellite galaxies of the Milky Way, which are virtually void of astrophysical background and have a relatively well known dark matter density; in the region close to the Galactic Centre, where the dark matter density is expected to be large while the astrophysical background due to the Galactic Centre can be excluded; and in clusters of galaxies, where the intrinsic flux may be boosted significantly by the large number of halo substructures. The possible search for spatial signatures, facilitated by the larger field of view of CTA, is also discussed. Next we consider searches for axion-like particles which, besides being possible candidates for dark matter may also explain the unexpectedly low absorption by extragalactic background light of gamma-rays from very distant blazars. We establish the axion mass range CTA could probe through observation of long-lasting flares in distant sources. Simulated light-curves of flaring sources are also used to determine the sensitivity to violations of Lorentz invariance by detection of the possible delay between the arrival times of photons at different energies. Finally, we mention searches for other exotic physics with CTA.
The local hadronic calibration scheme developed for the reconstruction and calibration of jets and missing transverse energy in ATLAS has been evaluated using data obtained during combined beam tests ...of modules of the ATLAS liquid argon endcap and forward calorimeters. These tests covered the pseudorapidity range of 2.5<|η|<4.0. The analysis has been performed using special sets of calibration weights and corrections obtained with the Geant4 simulation of a detailed beam-test setup. The evaluation itself has been performed through the careful study of specific calorimeter performance parameters such as e.g. energy response and resolution, shower shapes, as well as different physics lists of the Geant4 simulation.
The local hadronic calibration scheme developed for the reconstruction and calibration of jets and missing transverse energy in ATLAS has been evaluated using data obtained during combined beam tests ...of modules of the ATLAS liquid argon endcap and forward calorimeters. These tests covered the pseudorapidity range of 2.5 < | ? | < 4.0 . The analysis has been performed using special sets of calibration weights and corrections obtained with the Geant4 simulation of a detailed beam-test setup. The evaluation itself has been performed through the careful study of specific calorimeter performance parameters such as e.g. energy response and resolution, shower shapes, as well as different physics lists of the Geant4 simulation.
Muon pair production is studied in
p-
W and
S
U collisions at 200 GeV per nucleon, as a function of transverse momentum
P
Tμμ
. The inclusive
ϱ+
ω and Φ differential cross-sections
dσ
dP
T
are ...measured in the dimuon decay channel, for
P
T
≥ 0.6 GeV/c, in the central rapidity region, 3.0≤
y ≤ 4.0. Assuming the power law A-dependence
σ =
σ
0(
A
beam·
A
target)
α
, the study of the integrated cross-sections for
p-
W and
S
U collisions leads to
α
ϱ+
ω
= 1.00±0.02±0.07 and
α
Φ
= 1.23±0.03±0.05, showing clear evidence of Φ enhancement in
S
U interactions as compared to
p-
W collisions.
The transverse mass differential cross-sections for the
ϱ +
ω and Φ resonances is obtained, in the central rapidity region, in
p-
W and
S
U interactions at 200 GeV/nucleon. The measured
ϱ +
ω and Φ ...temperatures are ∼ 15% higher in
S
U as compared to
p-
W collisions. The ratio of cross-sections times branching ratios into the dimuon channel
B
Φσ
Φ
(B
ϱσ
ϱ + B
ωσ
ω)
is studied as a function of the energy density reached in the collision and of the dimuon transverse momentum. The measured ratio is 2 to 3 times larger in
S
U than in
p-
W collisions and an enhancement is observed in
S
U interactions with increasing energy density.
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