Cross Section Measurement at CMS

نویسنده

  • Constantinos Melachrinos
چکیده

The startup of the Large Hadron Collider will allow scientists to probe energy scales that existed picoseconds after the Big Bang. Monte Carlo samples of many Standard Model processes are produced to simulate the conditions in the Compact Muon Solenoid detector. Data analysis techniques are developed to measure the cross section of the WZ 3e(e, 1u) decay channel. The results are al = 723.4 + 27.6(stat.) ± 144.7(syst.) fb for integrated luminosity 1 fb1. Cross section measurements deduced by our data analysis techniques agree with the theoretical predictions, ared. 708 ± 26.6 fb. The selection of WZ --+ 3U events gave 43.5 ± 6.6 signal events with 6.4 ± 2.5 background events, enough to claim an observation at the level of five standard deviations. The understanding of this process will aid in the search for the Higgs boson, as well as in the search for new physics in the early stages of the operation of the detector. Thesis Supervisor: Christoph M.E. Paus Title: Associate Professor

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Measurement of the t t production cross section in pp collisions at 7 TeV in leptonþ jets events using b-quark jet identification

S. Chatrchyan et al.* (CMS Collaboration) (Received 17 August 2011; published 14 November 2011) A new measurement of the inclusive production cross section for pp ! t t is performed at a center-ofmass energy of 7 TeV using data collected by the CMS experiment at the LHC. The analysis uses a data sample corresponding to an integrated luminosity of 36 pb , and is based on the final state with one...

متن کامل

Measurement of the double-differential inclusive jet cross section at sqrt(s) = 8 TeV with the CMS detector

A measurement of the inclusive jet cross section, double-differential in jet transverse momentum pT and absolute jet rapidity |y|, is presented. Data from LHC proton-proton collisions at √ s = 8 TeV, corresponding to an integrated luminosity of 10.71 fb−1, have been collected with the CMS detector. Jets are reconstructed with the anti-kT clustering algorithm for a jet size parameter R = 0.7 in ...

متن کامل

مطالعه تولید منحصر بفرد جفت پایونهای مثبت و منفی در برخوردهای پروتون-پروتون با مرکز جرم 7 ترا الکترون ولت

The exclusive production of charged pions, are reported in the proton-proton collisions, where the π+π- pair is emitted at the central rapidity, y, and the scattered protons stay intact (p) without detection. This measurement is performed with the CMS detector at the LHC, using a data sample corresponding to an integrated luminosity of 450 μb-1 collected at a center-of-mass energy of  7 TeV. Th...

متن کامل

Measurement of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section in pp collisions at sqrt(s) = 7 TeV and first determination of the strong coupling constant in the TeV range

A measurement is presented of the ratio of the inclusive 3-jet cross section to the inclusive 2-jet cross section as a function of the average transverse momentum, 〈pT1,2〉, of the two leading jets in the event. The data sample was collected during 2011 at a proton-proton centre-of-mass energy of 7 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 5.0 fb−1. The s...

متن کامل

Measurement of differential and integrated fiducial cross sections for Higgs boson production in the four-lepton decay channel in pp collisions at sqrt(s) = 7 and 8 TeV

Integrated fiducial cross sections for the production of four leptons via the H → 4` decays (` = e, μ) are measured in pp collisions at √ s = 7 and 8 TeV. Measurements are performed with data corresponding to integrated luminosities of 5.1 fb−1 at 7 TeV, and 19.7 fb−1 at 8 TeV, collected with the CMS experiment at the LHC. Differential cross sections are measured using the 8 TeV data, and are d...

متن کامل

Measurement of the H / A → ττ cross section and possible constraints on tan β

The achievable precision of the cross section times branching ratio measurement from the event rates is estimated for the MSSM H/A → τ τ decay in the associated production process gg → b ¯ bH/A at large tanβ in CMS. This work demonstrates that the above production and decay process exhibit a large sensitivity to tanβ and thus add as a significant observable to a global fit of the SUSY parameter...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2009