2,469 research outputs found
Study of Z/gamma* + jets production with the CMS detectorusing matched Matrix Element-Parton Shower event generators
Towards enhanced databases for High Energy Physics
The accumulation of a large amount of new experimental data at an impressive
rate at present and future collider experiments has led to important questions
concerning data storage and organization, their public access and usability, as
well as their efficient usage in order to discriminate between different
theories. For the last fourty years, the HEPData database has been the
reference database for the worldwide community of elementary particle
physicists, from DIS to fixed-target and collider experts. Using as a basis a
dump of HEPData*, we discuss possible paths to enhance the capabilities of
databases for High Energy Physics. Our starting point is the reorganization of
the data in a different scheme, which allows for the application of OLAP
techniques to automatically extract information at a multidimensional level,
answering to complex queries. The feedback of the DIS community is important
for understanding specific needs, aiming at a more effective storage,
extraction and presentation of the data and information of their interest.Comment: *the HepData dump on which this work is based was kindly provided us
by K. Ellis, F. Krauss, G. Watt (IPPP Durham). 6 pages, 3 figures,to be
published as PoS (DIS2019) 223, in Proceedings of the XXVII International
Workshop on Deep Inelastic Scattering and Related Subjects, Torino Italy, 8 -
12 April 201
Search for long-lived particles that decay into final states containing two electrons or two muons in proton-proton collisions at sqrt(s) = 8 TeV
Search for stealth supersymmetry in events with jets, either photons or leptons, and low missing transverse momentum in pp collisions at 8 TeV
Model independent measurements of Standard Model cross sections with Domain Adaptation
With the ever growing amount of data collected by the ATLAS and CMS
experiments at the CERN LHC, fiducial and differential measurements of the
Higgs boson production cross section have become important tools to test the
standard model predictions with an unprecedented level of precision, as well as
seeking deviations that can manifest the presence of physics beyond the
standard model. These measurements are in general designed for being easily
comparable to any present or future theoretical prediction, and to achieve this
goal it is important to keep the model dependence to a minimum. Nevertheless,
the reduction of the model dependence usually comes at the expense of the
measurement precision, preventing to exploit the full potential of the signal
extraction procedure. In this paper a novel methodology based on the machine
learning concept of domain adaptation is proposed, which allows using a complex
deep neural network in the signal extraction procedure while ensuring a minimal
dependence of the measurements on the theoretical modelling of the signal.Comment: 16 pages, 10 figure
Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at √s = 7 TeV
Measurement of transverse momentum relative to dijet systems in PbPb and pp collisions at root s(NN)=2.76 TeV
Prospective Studies for LEP3 with the CMS Detector
On July 4, 2012, the discovery of a new boson, with mass around 125 GeV/c2
and with properties compatible with those of a standard-model Higgs boson, was
announced at CERN. In this context, a high-luminosity electron-positron
collider ring, operating in the LHC tunnel at a centre-of-mass energy of 240
GeV and called LEP3, becomes an attractive opportunity both from financial and
scientific point of views. The performance and the suitability of the CMS
detector are evaluated, with emphasis on an accurate measurement of the Higgs
boson properties. The precision expected for the Higgs boson couplings is found
to be significantly better than that predicted by Linear Collider studies.Comment: 25 pages, 13 figures, 3 tables, Submitted to the European Strategy
Preparatory Group (contribution 171), Companion to arXiV:1208.0504. Version 2
contains several additional Higgs decay channels studied, and numbers for
TLEP as well as for LEP
Validation tests of the CMS TIB/TID structures
Tracker Inner Barrel half-cylinders and Tracker Inner Disks of the CMS tracker have been integrated in three INFN sites. Integrated structures are submitted to an extensive set of tests whose main aim is to validate the functioning of the structures in CMS-like conditions. The tests have furthermore proven to be a great opportunity to study several aspects of the performance in detail. In this note the tests are described in some detail and an overview of the results is presented
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