AbstractWe discuss possible searches for the new particles predicted by Little Higgs Models at the LHC. By using a simulation of the ATLAS detector, we demonstrate how the predicted quark, gauge ...bosons and additional Higgs bosons can be found and estimate the mass range over which their properties can be constrained.
Parkinson's disease (PD) is a chronic, progressive, disabling movement disorder with a clear impact on Health-Related Quality of Life (HRQoL). We investigated the correlations between HRQoL and sleep ...disorders measured with the Parkinson's disease Sleep Scale (PDSS) and the motor and non-motor aspects of the disease. A correlation was found between HRQoL and the scores from PDSS, motor and depression scales. We conclude that more attention should be paid to the non-motor aspects of PD to attempt to improve HRQoL.
AbstractKaluza-Klein excitations of the gauge bosons are a notable feature of theories with “small” (~ 1 TeV) extra dimensions. The leptonic decays of the excitations of γ and Z bosons provide a ...striking signature which can be detected at the LHC. We investigate the reach for these signatures through a parametrized simulation of the ATLAS detector. With an integrated luminosity of 100 fb–1 a peak in the lepton-lepton invariant mass will be detected if the compactification scale (Mc) is below 5.8 TeV. If no peak is observed, with an integrated luminosity of 300 fb–1 a limit of Mc<12–13.5 TeV can be obtained from a detailed study of the shape of the lepton-lepton invariant mass distribution. If a peak is observed, the study of the angular distribution of the two leptons will allow to distinguish the KK excitations from alternative models yielding the same signature.PACS: 11.10Kk – 11.25Mj – 13.85-t
A
bstract
We consider minimal dark matter scenarios featuring momentum-dependent couplings of the dark sector to the Standard Model. We derive constraints from existing LHC searches in the monojet ...channel, estimate the future LHC sensitivity for an integrated luminosity of 300 fb
−1
, and compare with models exhibiting conventional momentum-independent interactions with the dark sector. In addition to being well motivated by (composite) pseudo-Goldstone dark matter scenarios, momentum-dependent couplings are interesting as they weaken direct detection constraints. For a specific dark matter mass, the LHC turns out to be sensitive to smaller signal cross-sections in the momentum-dependent case, by virtue of the harder jet transverse-momentum distribution.
Test beam results of the fiber-sampling dual-readout calorimeter Giaz, A.; Santoro, R.; Ampilogov, N. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
March 2023, 2023-03-00, Letnik:
1048
Journal Article
Recenzirano
The dual-readout calorimetric technique reconstructs the event-by-event electromagnetic fraction of the hadronic shower through the simultaneous measurement of scintillating (S) and Cherenkov (C) ...light produced by the shower development. The new generation of prototypes, based on Silicon Photomultipliers (SiPMs) readout, adds unprecedented granularity to the well-known high-energy resolution. A highly granular prototype (10×10×100cm3), designed to fully contain electromagnetic showers, was recently built and qualified on beam. It consists of 9 modules, each made of 320 brass capillaries equipped with both scintillating and clear fibers. All the fibers of the central module are coupled with SiPMs, while the PMTs are used for the others. Furthermore, the new FERS-System, designed by Caen to exploit the CITIROC1A ASICs performances, is at the core of the SiPM readout.
The recent test beam at DESY allowed us to qualify the readout system and define a procedure to calibrate the SiPM response from ADC to ph-e in a wide dynamic range. We measured the number of ph-e per GeV for scintillating and Cherenkov light together with the calorimetric performances in the energy range of 1–6 GeV. This work reports the system qualification and the test beam results regarding SiPM calibration.
The resonant production of sneutrinos at the LHC via the R-parity violating couplings
λ′
ijk
×
L
i
Q
j
D
c
k
is studied through its three-leptons signature. A detailed particle level study of signal ...and background is performed using a fast simulation of the ATLAS detector. Through the full reconstruction of the cascade decay, a model-independent and precise measurement of the masses of the involved sparticles can be performed. Besides, this signature can be detected for a broad class of supersymmetric models, and for a wide range of values of several
λ′
ijk
coupling constants. Within the MSSM, the production of a 850 GeV sneutrino for
λ′
211>0.05, and of a 300 GeV sneutrino for
λ′
211>0.01 can be observed within the first three years of LHC running.
AbstractKaluza-Klein excitations of the gauge bosons are a notable feature of theories with “small” (~ 1 TeV) extra dimensions. The leptonic decays of the excitations of the W boson provide at the ...LHC the striking signature of events containing an isolated high PT lepton accompanied by a high transverse momentum imbalance. We investigate the reach for these signatures through a parametrized simulation of the ATLAS detector. With an integrated luminosity of 100 fb–1 a peak in the transverse invariant mass of the lepton-neutrino system will be detected if the compactification scale (Mc) is below 6 TeV. If no signal is observed, with an integrated luminosity of 100 fb–1 a limit of Mc>11.7 TeV can be obtained from the study of the lepton-neutrino transverse mass distribution below the peak. If a peak is detected, a measurement of the couplings of the boson to leptons and quarks can be performed for Mc up to ~5 TeV.PACS: 11.10Kk – 11.25Mj – 13.85-t
Large-size Resistive Micromegas have been chosen for the upgrade of the forward muon spectrometer of the ATLAS experiment, the New Small Wheel project. These chambers, together with small-strip Thin ...Gap Chambers (sTGC), allow reconstruction of high-momentum muon tracks in a high-radiation environment and provide a robust low-threshold single-muon trigger. A collaboration of seven INFN units built 32 SM1 type chambers, corresponding to one fourth of the total number needed for this upgrade. Each SM1 chamber has a surface of approximately 2 m2 and four sensitive layers. The production was shared among five INFN construction sites and it was completed in fall 2020. The construction methods, as well as the results of the quality tests done on components of the detector and on the assembled chambers, are reported in the present paper.