CMS physics technical design report, volume II: Physics performance

Bayatian, G. L.
Chatrchyan, S.
Hmayakyan, G.
Sirunyan, A. M.
Adam, W.
Bergauer, T.
Dragicevic, M.
Eroe, J.
Friedl, M.
Fruehwirth, R.
Ghete, V.
Glaser, P.
Hrubec, J.
Jeitler, M.
Krammer, M.
Magrans, I.
Mikulec, I.
Mitaroff, W.
Noebauer, T.
Pernicka, M.
Porth, P.
Rohringer, H.
Strauss, J.
Taurok, A.
Waltenberger, W.
Walzel, G.
Widl, E.
Wulz, C-E
Fedorov, A.
Korzhik, M.
Missevitch, O.
Zuyeuski, R.
Chekhovsky, V.
Dvornikov, O.
Emeliantchik, I.
Litomin, A.
Mossolov, V.
Shumeiko, N.
Solin, A.
Stefanovitch, R.
Gonzalez, J. Suarez
Tikhonov, A.
Petrov, V.
D'Hondt, J.
De Weirdt, S.
Goorens, R.
Heyninck, J.
Lowette, S.
Tavernier, S.
Van Doninck, W.
Van Lancker, L.
Bouhali, O.
Clerbaux, B.
De Lentdecker, G.
Dewulf, J. P.
Mahmoud, T.
Marage, P. E.
Neukermans, L.
Sundararajan, V.
Vander Velde, C.
Vanlaer, P.
Wickens, J.
Assouak, S.
Bonnet, J. L.
Bruno, G.
Caudron, J.
De Callatay, B.
De Jeneret, J. De Favereau
De Visscher, S.
Delaere, C.
Demin, P.
CMS is a general purpose experiment, designed to study the physics of pp collisions at 14 TeV at the Large Hadron Collider ( LHC). It currently involves more than 2000 physicists from more than 150 institutes and 37 countries. The LHC will provide extraordinary opportunities for particle physics based on its unprecedented collision energy and luminosity when it begins operation in 2007. The principal aim of this report is to present the strategy of CMS to explore the rich physics programme offered by the LHC. This volume demonstrates the physics capability of the CMS experiment. The prime goals of CMS are to explore physics at the TeV scale and to study the mechanism of electroweak symmetry breaking - through the discovery of the Higgs particle or otherwise. To carry out this task, CMS must be prepared to search for new particles, such as the Higgs boson or supersymmetric partners of the Standard Model particles, from the start- up of the LHC since new physics at the TeV scale may manifest itself with modest data samples of the order of a few fb(-1) or less. The analysis tools that have been developed are applied to study in great detail and with all the methodology of performing an analysis on CMS data specific benchmark processes upon which to gauge the performance of CMS. These processes cover several Higgs boson decay channels, the production and decay of new particles such as Z' and supersymmetric particles, B-s production and processes in heavy ion collisions. The simulation of these benchmark processes includes subtle effects such as possible detector miscalibration and misalignment. Besides these benchmark processes, the physics reach of CMS is studied for a large number of signatures arising in the Standard Model and also in theories beyond the Standard Model for integrated luminosities ranging from 1 fb(-1) to 30 fb(-1). The Standard Model processes include QCD, B-physics, diffraction, detailed studies of the top quark properties, and electroweak physics topics such as the W and Z(0) boson properties. The production and decay of the Higgs particle is studied for many observable decays, and the precision with which the Higgs boson properties can be derived is determined. About ten different supersymmetry benchmark points are analysed using full simulation. The CMS discovery reach is evaluated in the SUSY parameter space covering a large variety of decay signatures. Furthermore, the discovery reach for a plethora of alternative models for new physics is explored, notably extra dimensions, new vector boson high mass states, little Higgs models, technicolour and others. Methods to discriminate between models have been investigated. This report is organized as follows. Chapter 1, the Introduction, describes the context of this document. Chapters 2-6 describe examples of full analyses, with photons, electrons, muons, jets, missing E-T, B-mesons and tau's, and for quarkonia in heavy ion collisions. Chapters 7-15 describe the physics reach for Standard Model processes, Higgs discovery and searches for new physics beyond the Standard Model.


Measurement and interpretation of differential cross sections for Higgs boson production at root s=13 TeV
Sirunyan, A. M.; et. al. (Elsevier BV, 2019-05-01)
Differential Higgs boson (H) production cross sections are sensitive probes for physics beyond the standard model. New physics may contribute in the gluon-gluon fusion loop, the dominant Higgs boson production mechanism at the LHC, and manifest itself through deviations from the distributions predicted by the standard model. Combined spectra for the H -> gamma gamma, H -> ZZ, and H -> b (b) over bar decay channels and the inclusive Higgs boson production cross section are presented, based on proton-proton c...
Collider effects of unparticle interactions in multiphoton signals
Alıyev, Tahmasıb; Turan, İsmail (American Physical Society (APS), 2009-12-01)
A new model of physics, with a hidden conformal sector which manifests itself as an unparticle coupling to standard model particles effectively through higher dimensional operators, predicts strong collider signals due to unparticle self-interactions. We perform a complete analysis of the most spectacular of these signals at the hadron collider, pp(p)->gamma gamma gamma gamma and gamma gamma gg. These processes can go through the three-point unparticle self-interactions as well as through some s and t chann...
Cross section measurement of t-channel single top quark production in pp collisions at root s=13 TeV
Sirunyan, A. M.; et. al. (Elsevier BV, 2017-09-01)
The cross section for the production of single top quarks in the t channel is measured in proton- proton collisions at 13TeV with the CMS detector at the LHC. The analyzed data correspond to an integrated luminosity of 2.2fb(-1). The event selection requires one muon and two jets where one of the jets is identified as originating from a bottom quark. Several kinematic variables are then combined into a multivariate discriminator to distinguish signal from background events. A fit to the distribution of the ...
Measurement of upsilon production in 7 TeV pp collisions at ATLAS
Aad, G.; et. al. (American Physical Society (APS), 2013-03-04)
Using 1.8 fb(-1) of pp collisions at a center- of- mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections of Upsilon(1S,2S,3S) mesons. Upsilon mesons are reconstructed using the dimuon decay mode. Total production cross sections for p(T) < 70 GeV and in the rapidity interval vertical bar y(Upsilon)vertical bar < 2. 25 are measured to be, 8.01 +/- 0.02 +/- 0.36 +/- 0.31 nb, 2.05 +/- 0.01 +/- 0.12 +/- 0.08 nb, and 0.92 +/- 0.0...
Observation of a new boson with mass near 125 GeV in pp collisions at root s=7 and 8 TeV
Chatrchyan, S.; et. al. (Springer Science and Business Media LLC, 2013-06-01)
A detailed description is reported of the analysis used by the CMS Collaboration in the search for the standard model Higgs boson in pp collisions at the LHC, which led to the observation of a new boson. The data sample corresponds to integrated luminosities up to 5.1 fb(-1) at root s = 7 TeV, and up to 5.3 fb(-1) at root s = 8 TeV. The results for five Higgs boson decay modes gamma gamma, ZZ, WW, tau tau, and bb, which show a combined local significance of 5 standard deviations near 125 GeV, are reviewed. ...
Citation Formats
G. L. Bayatian et al., “CMS physics technical design report, volume II: Physics performance,” JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, pp. 995–1579, 2007, Accessed: 00, 2020. [Online]. Available: