Numerous studies on Jet Production, Vector Boson Production, V+Jets Production and Multi-Boson Production have been carried out by the Compact Muon Solenoid (CMS) Collaboration to test perturbative ...quantum chromodynamics (QCD) predictions, and to put more stringent constraints on PDFs (Parton Distribution Functions). In this paper, some of these experimental results will be presented, and their possible impacts on Higgs physics and new physics searches will be discussed.
In this study, a novel approach is demonstrated for converting calorimeter images from fast simulations to those akin to comprehensive full simulations, utilizing conditional Generative Adversarial ...Networks (GANs). The concept of pix2pix is tailored for CALPAGAN, where images from fast simulations serve as the basis(condition) for generating outputs that closely resemble those from detailed simulations. The findings indicate a strong correlation between the generated images and those from full simulations, especially in terms of key observables like jet transverse momentum distribution, jet mass, jet subjettiness, and jet girth. Additionally, the paper explores the efficacy of this method and its intrinsic limitations. This research marks a significant step towards exploring more efficient simulation methodologies in High Energy Particle Physics.
A measurement of the double-differential inclusive dijet production cross section in proton-proton collisions at \sqrt{s}= 7 TeV is presented as a function of the dijet invariant mass and jet ...rapidity. The data correspond to an integrated luminosity of 36 pb^{-1}, recorded with the CMS detector at the LHC in 2010. The measurement covers the dijet mass range 0.2 TeV to 3.5 TeV and jet rapidities up to |y|=2.5. It is found to be in good agreement with next-to-leading-order QCD predictions.
A method for correcting smearing effects using machine learning technique is presented. Compared to the standard deconvolution approaches in high energy particle physics, the method can use more than ...one reconstructed variable to predict the value of unsmeared quantity on an event-by-event basis. In this particular study, deconvolution is interpreted as a classification problem, and neural networks (NN) are trained to deconvolute the Z boson invariant mass spectrum generated with MadGraph and pythia8 Monte Carlo event generators in order to prove the principle. Results obtained from the machine learning method is presented and compared with the results obtained with traditional methods.
The RADiCAL Collaboration is conducting R\&D on high performance
electromagnetic (EM) calorimetry to address the challenges expected in future
collider experiments under conditions of high luminosity ...and/or high
irradiation (FCC-ee, FCC-hh and fixed target and forward physics environments).
Under development is a sampling calorimeter approach, known as RADiCAL modules,
based on scintillation and wavelength-shifting (WLS) technologies and
photosensor, including SiPM and SiPM-like technology. The modules discussed
herein consist of alternating layers of very dense (W) absorber and
scintillating crystal (LYSO:Ce) plates, assembled to a depth of 25 $X_0$. The
scintillation signals produced by the EM showers in the region of EM shower
maximum (shower max) are transmitted to SiPM located at the upstream and
downstream ends of the modules via quartz capillaries which penetrate the full
length of the module. The capillaries contain DSB1 organic plastic WLS
filaments positioned within the region of shower max, where the shower energy
deposition is greatest, and fused with quartz rod elsewhere. The wavelength
shifted light from this spatially-localized shower max region is then
propagated to the photosensors. This paper presents the results of an initial
measurement of the time resolution of a RADiCAL module over the energy range 25
GeV $\leq$ E $\leq$ 150 GeV using the H2 electron beam at CERN. The data
indicate an energy dependence of the time resolution that follows the
functional form: $\sigma_{t} = a/\sqrt{E} \oplus b$, where a = 256
$\sqrt{GeV}$~ps and b = 17.5 ps. The time resolution measured at the highest
electron beam energy for which data was currently recorded (150 GeV) was found
to be $\sigma_{t}$ = 27 ps.
We would like to propose the construction of the photon collider based "Higgs factory" in the coming years at the Greek-Turkish border, starting from its test facility with a high energy photon beam. ...This proposal was among the contributions to the Open Symposium of the ESPG'12.
The RADiCAL Collaboration is conducting R\&D on high performance electromagnetic (EM) calorimetry to address the challenges expected in future collider experiments under conditions of high luminosity ...and/or high irradiation (FCC-ee, FCC-hh and fixed target and forward physics environments). Under development is a sampling calorimeter approach, known as RADiCAL modules, based on scintillation and wavelength-shifting (WLS) technologies and photosensor, including SiPM and SiPM-like technology. The modules discussed herein consist of alternating layers of very dense (W) absorber and scintillating crystal (LYSO:Ce) plates, assembled to a depth of 25 \(X_0\). The scintillation signals produced by the EM showers in the region of EM shower maximum (shower max) are transmitted to SiPM located at the upstream and downstream ends of the modules via quartz capillaries which penetrate the full length of the module. The capillaries contain DSB1 organic plastic WLS filaments positioned within the region of shower max, where the shower energy deposition is greatest, and fused with quartz rod elsewhere. The wavelength shifted light from this spatially-localized shower max region is then propagated to the photosensors. This paper presents the results of an initial measurement of the time resolution of a RADiCAL module over the energy range 25 GeV \(\leq\) E \(\leq\) 150 GeV using the H2 electron beam at CERN. The data indicate an energy dependence of the time resolution that follows the functional form: \(\sigma_{t} = a/\sqrt{E} \oplus b\), where a = 256 \(\sqrt{GeV}\)~ps and b = 17.5 ps. The time resolution measured at the highest electron beam energy for which data was currently recorded (150 GeV) was found to be \(\sigma_{t}\) = 27 ps.
PDF
