Detector Control System for CMS Endcap RPCs and Cross Section Measurement of t¯ t dileptonic channel with the CMS Detector at √s = 8 TeV

Taimoor Khurshid, . (2015) Detector Control System for CMS Endcap RPCs and Cross Section Measurement of t¯ t dileptonic channel with the CMS Detector at √s = 8 TeV. Doctoral thesis, Quaid-i-Azam University, Islamabad.

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Abstract

The Resistive Plate Chamber Endcap(RE) system consists of 432 double-gap chambers equipped with about 1296 front-end boards. Safe and correct operation of RE system requires a sophisticated and complex online Detector Control System(DCS), which should be able to control and monitor 2×103 hardware devices spanned on an area of about 2000 m2. DCS of RE system monitors, acquires and stores about 103 parameters obtained from the detector, electronics, power system, gas, and cooling systems. The RE DCS system and its performance during the 2007 and 2008 CMS cosmic runs, will be discussed in this thesis. The tt¯pair production cross section is measured in 2012 proton-proton collisions at √s = 8 TeV using 19.7 fb−1 of integrated luminosity data sample of the CMS experiment. The measurement is done by using events in which we have two high pT leptons (muons or electrons), missing transverse energy and atleast one jet identified as b-quark, in the final state. The cross section was value σtt¯ = 248.530 ± 1.028(stat.) ± 8.202(syst.)pb is in agreement with theoretical predictions, also individual cross section for each dilepton channel are provided.

Item Type: Thesis (Doctoral)
Uncontrolled Keywords: Detector,Control System, CMS Endcap RPCs t¯ t ,dileptonic ,CMS Detector
Subjects: B Philosophy. Psychology. Religion > B Philosophy (General)
Depositing User: Unnamed user with email jmemon@hec.gov.pk
Date Deposited: 26 Oct 2017 08:02
Last Modified: 26 Oct 2017 08:02
URI: http://eprints.hec.gov.pk/id/eprint/6884

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