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\usepackage{lscape} |
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\usepackage{graphicx} |
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\usepackage{pst-node} |
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\usepackage{epstopdf} |
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%\usepackage[croatian]{babel} |
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\renewcommand{\dj}{d\kern-0.4em\char"16\kern-0.1em} |
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\renewcommand{\DJ}{\raise0.3ex\hbox{-}\kern-0.36em D} |
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\RequirePackage{xspace} |
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\input noteWZsymbols |
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\begin{titlepage} |
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|
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\analysisnote{2008/xxx} |
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\date{20 June 2008} |
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\analysisnote{2008/051} |
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\date{\today} |
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|
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\title{Study of the process\\ |
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$ \proton\proton\to \W\Z \to \ell^{\pm} \ellell (\ell=e,\mu)$\\ |
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$ \proton\proton\to \W\Z \to \ell^{\pm}\nu \ellell (\ell=e,\mu)$\\ |
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at CMS} |
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\begin{Authlist} |
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V.~Brigljevi\'c, S.~Morovi\'c, S.~Djuri\'c |
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\Instfoot{IRB}{Rudjer Bo\v skovi\'c Institute, 10002 Zagreb, Croatia} |
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V.~Brigljevi\'c, S.~Morovi\'c, S.~ \DJ uri\'c |
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\Instfoot{IRB}{Ru\dj er Bo\v skovi\'c Institute, 10002 Zagreb, Croatia} |
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S.~Beauceron |
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\Instfoot{CERN}{CERN, Geneva, Switzerland} |
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K.~Kaadze, Y.~Maravin |
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\begin{abstract} |
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|
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In this note, we investigate the discovery potential |
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for the $\proton\proton \to \W\Z \to \ell^{\pm} \ellell (\ell=e,\mu)$ process at CMS, |
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with full detector simulation of the signal and of the various backgrounds. |
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We determine the signal significance as a function of |
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integrated luminosity at the LHC based on Standard Model |
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cross sections computed at the next to leading order in $\alpha_s$. |
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We expect $\sim 97 $ signal $\W\Z \to \ell^{\pm} \ellell (\ell=e,\mu)$ events for $\sim 22$ background |
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events per inverse femtobarn. The background is found |
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to be dominated by the $\Zbbbar$, $\t\tbar$ and \ZZ processes with three true electrons or muons in the |
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final state. The sensitivity of the analysis allows for a potential 5-sigma discovery |
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of the $\proton\proton \to\W\Z$ channel with about 150 inverse picobarn. |
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for the $\proton\proton \to \W\Z \to \ell^{\pm}\nu\ellell (\ell=e,\mu)$ process at CMS, |
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using full detector simulation of the signal and of the various physics and |
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instrumental backgrounds. We propose data driven methods to extract backgrounds |
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and estimate that we can reach 5$\sigma$ significance of \WZ signal at CMS with |
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less than 300 \invpb at 95 \% C.L.. |
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|
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% We determine the signal significance as a function of |
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% integrated luminosity at the LHC based on Standard Model |
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% cross sections computed at the next to leading order in $\alpha_s$. |
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% We expect $\sim 97 $ signal $\W\Z \to \ell^{\pm}\nu \ellell (\ell=e,\mu)$ events |
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% and $\sim 22$ background events per inverse femtobarn. The background is found |
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% to be dominated by the $\Zbbbar$, $\t\tbar$, and \ZZ processes. |
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% The sensitivity of the method allows for a potential 5-sigma discovery |
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% of the $\proton\proton \to\W\Z$ process with about 150 inverse picobarn. |
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\end{abstract} |
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\end{titlepage} |
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\input introduction |
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\input samples |
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\input selection |
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\input zjetbackground |
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\input Sys |
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\input results |
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\input conclusion |
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%\input trial |
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%\newpage |
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\bibliographystyle{physrev4wt} |
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\bibliography{noteWZ} |
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|
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\begin{thebibliography}{99} |
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\bibitem{Haywood:1999qg} S.Haywood {\it et al.} ``Electroweak physics'', hep-ph/0003275 |
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\bibitem{Sjostrand:2003wg} T. Sjostrand, L. Lonnblad, S. Mrenna and P. Skands, ``PYHTIA 6.3: Physics and manual'', hep-ph/0308153 |
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\bibitem{Campbell:2005} J. M. Campbell and R. K. Ellis, ``MCFM v4.1. A Monte Carlo for FeMtobarn processes at hadron colliders'' |
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\bibitem{Frixione:2002ik} S. Frixione and B. R. Webber, ``Matching NLO QCD computations and parton shower simulations'', JHEP 06.029 (2002), [hep-ph/0204244] |
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\bibitem{noteElectronID} S.~Beauceron, K.~Kaadze, Y.~Maravin, V.~Brigljevic, S.~Morovic, ``Study of electron identification in $\W^{\pm} Z\to \ell^+\ell^- \ell^\pm \nu$ events'', CMS~AN-2008/047 |
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\bibitem{Zmumu} N.~Adam {\it and al}, ``Towards a measurement of the inclusive $W\rightarrow\mu\nu$ and $Z\rightarrow\mu^{+}\mu^{-}$ cross sections in pp collisions at $\sqrt{s} = 14$ TeV'', CMS~AN-2007/031 |
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\bibitem{Zee}N.~Adam {\it and al}, ``Towards a Measurement of the Inclusive $W\rightarrow e\nu$ and $Z\rightarrow ee$ Cross Section in pp Collisions at sqrt(s) = 14 TeV'', CMS~AN-2007/026 |
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\bibitem{TP}G.~Daskalakis, D.~Evans, C.S.~Hill, J.~Jackson, P.~Vanlaer, J.~Berryhill, J.~Haupt, D.~Futyan, C.~Seez, C.~Timlin, D.~Wardrope, ``Measuring Electron Efficiencies at CMS with Early Data'', CMS~AN-2007/019 |
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\bibitem{OldNote}V.~Brigljevic, D.~Ferencek, S.~Morovic, M.~Planinic, A.~Oh ``Study of the process $pp\rightarrow WZ \rightarrow 3l$ at CMS'', CMS~AN-2006/063 |
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%\bibitem{PTDR1} CMS Collaboration, Physics Technical Design Report, Vol.1 - Detector Performance and Software, CERN/LHCC 2006-001 (February 2006). |
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\end{thebibliography} |
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\end{document} |
