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Design, performance, and calibration of the CMS hadron-outer calorimeter
, Article European Physical Journal C ; Volume 57, Issue 3 , 2008 , Pages 653-663 ; 14346044 (ISSN) ; Abramov, V ; Acharya, B ; Adam, N ; Adams, M ; Akchurin, N ; Akgun, U ; Albayrak, E ; Anderson, E. W ; Antchev, G ; Arcidy, M ; Ayan, S ; Aydin, S ; Aziz, T ; Baarmand, M ; Babich, K ; Baden, D ; Bakirci, M. N ; Banerjee, S ; Banerjee, S ; Bard, R ; Barnes, V ; Bawa, H ; Baiatian, G ; Bencze, G ; Beri, S ; Berntzon, L ; Bhandari, V ; Bhatnagar, V ; Bhatti, A ; Bodek, A ; Bose, S ; Bose, T ; Budd, H ; Burchesky, K ; Camporesi, T ; Cankoçak, K ; Carrell, K ; Cerci, S ; Chendvankar, S ; Chung, Y ; Clarida, W ; Cremaldi, L ; Cushman, P ; Damgov, J ; De Barbaro, P ; Debbins, P ; Deliomeroglu, M ; Demianov, A ; De Visser, T ; Deshpande, P. V ; Diaz, J ; Dimitrov, L ; Dugad, S ; Dumanoglu, I ; Duru, F ; Efthymiopoulos, I ; Elias, J ; Elvira, D ; Emeliantchik, I ; Eno, S ; Ershov, A ; Erturk, S ; Esen, S ; Eskut, E ; Fenyvesi, A ; Fisher, W ; Freeman, J ; Ganguli, S. N ; Gaultney, V ; Gamsizkan, H ; Gavrilov, V ; Genchev, V ; Gleyzer, S ; Golutvin, I ; Goncharov, P ; Grassi, T ; Green, D ; Gribushin, A ; Grinev, B ; Guchait, M ; Gurtu, A ; Murat Güler, A ; Gülmez, E ; Gümüş, K ; Haelen, T ; Hagopian, S ; Hagopian, V ; Halyo, V ; Hashemi, M ; Hauptman, J ; Hazen, E ; Heering, A ; Heister, A ; Hunt, A ; Ilyina, N ; Ingram, D ; Isiksal, E ; Jarvis, C ; Jeong, C ; Johnson, K ; Jones, J ; Kaftanov, V ; Kalagin, V ; Kalinin, A ; Kalmani, S ; Karmgard, D ; Kaur, M ; Kaya, M ; Kaya, O ; Kayis-Topaksu, A ; Kellogg, R ; Khmelnikov, A ; Kim, H ; Kisselevich, I ; Kodolova, O ; Kohli, J ; Kolossov, V ; Korablev, A ; Korneev, Y ; Kosarev, I ; Kramer, L ; Krinitsyn, A ; Krishnaswamy, M. R ; Krokhotin, A ; Kryshkin, V ; Kuleshov, S ; Kumar, A ; Kunori, S ; Laasanen, A ; Ladygin, V ; Laird, E ; Landsberg, G ; Laszlo, A ; Lawlor, C ; Lazic, D ; Lee, S. W ; Levchuk, L ; Linn, S ; Litvintsev, D ; Lobolo, L ; Los, S ; Lubinsky, V ; Lukanin, V ; Ma, Y ; MacHado, E ; Maity, M ; Majumder, G ; Mans, J ; Marlow, D ; Markowitz, P ; Martinez, G ; Mazumdar, K ; Merlo, J. P ; Mermerkaya, H ; Mescheryakov, G ; Mestvirishvili, A ; Miller, M ; Moeller, A ; Mohammadi Najafabadi, M ; Moissenz, P ; Mondal, N ; Mossolov, V ; Nagaraj, P ; Narasimham, V. S ; Norbeck, E ; Olson, J ; Onel, Y ; Onengut, G ; Ozkan, C ; Ozkurt, H ; Ozkorucuklu, S ; Ozok, F ; Paktinat, S ; Pal, A ; Patil, M ; Penzo, A ; Petrushanko, S ; Petrosyan, A ; Pikalov, V ; Piperov, S ; Podrasky, V ; Polatoz, A ; Pompos, A ; Popescu, S ; Posch, C ; Pozdnyakov, A ; Qian, W ; Ralich, R. M ; Reddy, L ; Reidy, J ; Rogalev, E ; Roh, Y ; Rohlf, J ; Ronzhin, A ; Ruchti, R ; Ryazanov, A ; Safronov, G ; Sanders, D. A ; Sanzeni, C ; Sarycheva, L ; Satyanarayana, B ; Schmidt, I ; Sekmen, S ; Semenov, S ; Senchishin, V ; Sergeyev, S ; Serin, M ; Sever, R ; Singh, B ; Singh, J. B ; Sirunyan, A ; Skuja, A ; Sharma, S ; Sherwood, B ; Shumeiko, N ; Smirnov, V ; Sogut, K ; Sonmez, N ; Sorokin, P ; Spezziga, M ; Stefanovich, R ; Stolin, V ; Sudhakar, K ; Sulak, L ; Suzuki, I ; Talov, V ; Teplov, K ; Thomas, R ; Tonwar, S ; Topakli, H ; Tully, C ; Turchanovich, L ; Ulyanov, A ; Vanini, A ; Vankov, I ; Vardanyan, I ; Varela, F ; Vergili, M ; Verma, P ; Vesztergombi, G ; Vidal, R ; Vishnevskiy, A ; Vlassov, E ; Vodopiyanov, I ; Volobouev, I ; Volkov, A ; Volodko, A ; Wang, L ; Werner, J ; Wetstein, M ; Winn, D ; Wigmans, R ; Whitmore, J ; Wu, S. X ; Yazgan, E ; Yetkin, T ; Zalan, P ; Zarubin, A ; Zeyrek, M ; Sharif University of Technology
2008
Abstract
The Outer Hadron Calorimeter (HCAL HO) of the CMS detector is designed to measure the energy that is not contained by the barrel (HCAL HB) and electromagnetic (ECAL EB) calorimeters. Due to space limitation the barrel calorimeters do not contain completely the hadronic shower and an outer calorimeter (HO) was designed, constructed and inserted in the muon system of CMS to measure the energy leakage. Testing and calibration of the HO was carried out in a 300 GeV/c test beam that improved the linearity and resolution. HO will provide a net improvement in missing E T measurements at LHC energies. Information from HO will also be used for the muon trigger in CMS. © 2008 Springer-Verlag / Società...
Searches for New Physics with Opposite-Sign Di-Leptons(Using the CMS Experiment at the Large Hadron Collider)
, Ph.D. Dissertation Sharif University of Technology ; Arfaei, Hessamaddin (Supervisor) ; Pape, Luc ($item.subfieldsMap.e)
Abstract
Among the proposals for new physics, Supersymmetry is the most popular to gradually appear at a yet unreached center-of-mass energy at the Large Hadron Collider (LHC). However, that doesn’t seem very likely. This thesis represents a search for any evidence of a minimal supergravity inspired scenario (mSUGRA) of R-parity conserving supersymmetry at the Compact Muon Solenoid (CMS) experiment. The analysis employs an event topology , which consists primarily of opposite-sign di-leptons accompanied by hadronic jets and missing transverse energy. The search utilizes data produced by the proton-proton collision of the LHC at a center-of-mass energy p s = 7 TeV and recorded by the CMS detector in...
Test Beam Studies of The CMS ECAL Matrix Prototypes for HL-LHC
, M.Sc. Thesis Sharif University of Technology ; Arfaei, Hessamaddin (Supervisor)
Abstract
To investigate many interesting and rare physics processes at the Large Hadron Collider, we need much more data. The High Luminosity LHC (HL-LHC) is a foreseen upgrade for LHC to increase its luminosity and get ten times more data until the end of HL-LHC.Without any intervention, The CMS ECAL will face many challenges in HL-LHC. The end-caps must be fully replaced, and the electronic structure of the barrels will be modified. This thesis addresses the R&D studies of both sections.For the barrels, a test beam experiment has been performed on a prototype 5x5 matrix of legacy PbWO4 crystals with the new Very Front End (VFE) boards and the data has been analyzed.For endcaps, a 3x5 martix of...
Top Quark Mass Measurement Via Leptonic Observables in the CMS Experiment using 13 TeV PP Collision Data at the LHC
, M.Sc. Thesis Sharif University of Technology ; Torabian, Mahdi (Supervisor) ; Zeinali, Maryam (Co-Supervisor)
Abstract
The top quark is the heaviest of elementary particles. It gives the dominant contribution to the radiative correction to the Higgs self coupling constant which itself determines the structure of the electroweak vacuum. Therefore, it is extremely important to have a precise measurement of the top quark mass. On the other hand, whereas the lifetime of top quark is short and rapidly decays to lighter particles, it is not easy to compute and measure its mass with a desired precision. In this work, we propose a measurement method to determine the top quark mass in the t▁t→leptons +jets channel by analyzing the decay of the b-hadron in the top quark decay chain. Through the reconstruction of the...
The CMS ECAL Upgrade for Precision Crystal Calorimetry at the HL-LHC
, Article IEEE Transactions on Nuclear Science ; Volume 65, Issue 8 , 2018 , Pages 2004-2006 ; 00189499 (ISSN) ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
The Compact Muon Solenoid (CMS) experiment is operating at the Large Hadron Collider (LHC) with proton-proton collisions at 13-TeV center-of-mass energy and at a bunch spacing of 25 ns. Challenging running conditions for CMS are expected after the High-Luminosity upgrade of the LHC (HL-LHC). We review the CMS ECAL crystal calorimeter upgrade and present results from the first test beam studies. Particular challenges at HL-LHC are the harsh radiation environment, the increasing data rates, and the extreme level of pile-up events, with up to 200 simultaneous proton-proton collisions. Precision timing can be exploited to reduce the effect of the pileup. We report on the timing resolution...
Timing Analysis of LYSO-based Crystals
, M.Sc. Thesis Sharif University of Technology ; Arfaei, Hessamaddin (Supervisor) ; Bornheim, Adolf (Supervisor)
Abstract
The Large Hadron Collidor (LHC) will increase its luminosity to more than 10e35 cm-2 s-1. The large amount of data rates will provide enough datasets needed to probe rare Higgs processes, study the scattering of longitudinally polarized W bosons and physics beyond the standard model(BSM). In the upgraded version of the LHC, called High Luminosity LHC (HL-LHC), the number of simultaneous interactions per bunch crossing, aka pile-up, increases to 140-200. The large number of pile increases the possibility of confusion in distinguishing vertexes of interest due to the contamination from non-interesting vertexes. One of the methods to mitigate the pile-up, complementary to the precision tracking...
Search for Supersymmetry in Like Sign Dilepton Events in 2010 GMS Data
, Ph.D. Dissertation Sharif University of Technology ; Ardalan, Farhad (Supervisor) ; Pape, Luc (Supervisor)
Abstract
We search for supersymmetry in the same-sign dilepton final state in the first 35 pb1 of data collected by the CMS detector and find no evidence of new physics at this point. Since true same-sign physics backgrounds, such asWWjj, are negligible for this amount of integrated luminosity, we focus our attention on data-driven estimations of the backgrounds where one (W+jets and tt backgrounds) or both of the leptons (QCD background) are fake. We use the generalized fake ratio method documented to estimate the rates for these fake backgrounds. Another source of backgrounds in the case of electrons is the charge-flip, where the charge of one of the electrons in an opposite-sign di-electron pair...
Measurement of the B-Tagging Efficiency in the CMS Experiment with the First LHC Collisions
, Ph.D. Dissertation Sharif University of Technology ; Ardalan, Farhad (Supervisor)
Abstract
Jets originating from bottom (b) quarks, play an important role in the study of Standard Model processes together with the search for new physics. In the CMS experiment a considerable e?ort is dedicated to the development and the performance study of so-called b-tagging algorithms. On the other hand, the top quark which is produced in pair (tt¯) with a high rate at the LHC, decays near 99% of the time to a b-quark. Hence it provides a rich source of b-quark jets, suitable for b-jet identi?cation studies. In this thesis, a fully data-driven method to measure the b-tagging e?ciency, using top quark events in its semi-electron ?nal state, is developed. The results of the application of the...