Direct measurement of the top quark mass by the DØ Collaboration

Abbott, B.; Abolins, M.; Acharya, B. S.; Адам, И.; Adams, T.; Adams, M. R.; Ahn, Shihyun; Aihara, H.; Alves, G. A.; Amos, N.; Anderson, E. W.; Astur, R.; Baarmand, M. M.; Baden, A.; Balamurali, V.; Balderston, J.; Baldin, B.; Banerjee, S.; Bantly, J.; Barberis, E.; Bartlett, J. F.; Bazizi, K.; Belyaev, A.; Beri, S. B.; Bertram, I.; Bezzubov, V. A.; Bhat, P. C.; Bhatnagar, V.; Bhattacharjee, M.; Biswas, N. N.; Blazey, G.; Blessing, S.; Bloom, P. C.; Boehnlein, A.; Bojko, N. I.; Borcherding, F.; Boswell, C.; Brandt, A.; Brock, R.; Bross, A.; Buchholz, D.; Буртовой, В. С.; Butler, J. M.; Carvalho, W.; Casey, D.; Casilum, Z.; Castilla‐Valdez, H.; Chakraborty, D.; Chang, S. M.; Chekulaev, S. V.; Chen, L. P.; Chen, W.; Choi, S.; Chopra, S.; Choudhary, B. C.; Christenson, J. H.; Chung, M.; Claes, D. R.; Clark, A. R.; Cobau, W. G.; Cochran, J.; Coney, L.; Cooper, W. E.; Cretsinger, C.; Cullen-Vidal, D.; Cummings, M. A.C.; Ćutts, D.; Dahl, O. I.; Davis, K.; De, K.; Signore, K. 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S.; Hall, R. E.; Hanlet, P.; Hansen, S.; Hauptman, J. M.; Hedin, D.; Heinson, A. P.; Heintz, U.; Hernández-Montoya, R.; Heuring, T.; Hirosky, R.; Hobbs, J.; Hoeneisen, B.; Hoftun, J. S.; Hsieh, F.; Hu, Ting; Hu, T.; Huehn, T.; Ito, A. S.; James, E.; Jaques, J.; Jerger, S. A.; Jesik, R.; Jiang, Jun; Joffe–Minor, T.; Johns, K. A.; Johnson, M.; Jonckheere, A.; Jones, M.; Jöstlein, H.; Jun, S. Y.; Jung, C. K.; Kahn, S.; Kalbfleisch, G.; Kang, J. S.; Karmanov, D.; Karmgard, D. J.; Kehoe, R.; Kelly, M.; Kim, C. L.; Kim, S. K.; Klatchko, A.; Klima, B.; Klopfenstein, C.; Klyukhin, V.; Kochetkov, V.; Kohli, J. M.; Koltick, D.; Kostritskiy, A. V.; Kotcher, J.; Kotwal, A.; Kourlas, J.; Kozelov, A. V.; Kozlovski, E. A.; Krane, J.; Krishnaswamy, M. R.; Krzywdziński, S.; Kunori, S.; Lami, S.; Lander, R.; Landry, F.; Landsberg, G.; Lauer, B.; Leflat, A.; Li, H.; Li, J.; Li-Demarteau, Q. Z.; Lima, J. G.R.; Lincoln, D.; Linn, S.; Linnemann, J.; Lipton, R.; Liu, Y. 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Z.; Raja, R.; Rajagopalan, S.; Ramírez, O.; Rasmussen, L.; Reucroft, S.; Rijssenbeek, M.; Rockwell, T.; Roco, M.; Roe, N. A.; Rubinov, P.; Ruchti, R.; Rutherfoord, J. P.; Sánchez-Hernández, A.; Santoro, A.; Sawyer, L.; Schamberger, R. D.; Schellman, H.; Sculli, J.; Shabalina, E.; Shaffer, C.; Shankar, H. C.; Shivpuri, R. K.; Shupe, M. A.; Singh, H.; Singh, J. B.; Sirotenko, V.; Smart, W.; Smith, E.; Smith, R. P.; Snihur, R.; Snow, G. R.; Snow, J.; Snyder, S.; Solomon, J.; Sood, P. M.; Sosebee, M.; Sotnikova, N.; Souza, M.; Spadafora, A. L.; Steinbrück, G.; Stephens, R. W.; Stevenson, M. L.; Stewart, David J.; Stichelbaut, F.; Stoianova, D. A.; Stoker, D. P.; Strauss, M.; Streets, K.; Strovink, M.; Sznajder, A.; Tamburello, P.; Tarazi, J.; Tartaglia, M.; Thomas, T. L.; Thompson, J.; Trippe, T. G.; Tuts, P. M.; Varelas, N.; Varnes, E. W.; Vititoe, D.; Volkov, A.; Vorobiev, A. P.; Wahl, H. D.; Wang, G.; Warchol, J.; Watts, G.; Wayne, M.; Weerts, H.; White, A.; White, J. T.; Wightman, J. A.; Willis, S.; Wimpenny, S.; Wirjawan, J. V.D.; Womersley, J.; Won, E.; Wood, D.; Xu, H.; Yamada, R.; Yamin, P.; Yang, J.; Yasuda, T.; Yepes, P.; Yoshikawa, C.; Youssef, S.; Yu, J.; Yu, Y.; Zhu, Z. H.; Ziemińska, D.; Ziemiński, A.; Zverev, E. G.; Zylberstejn, A.

doi:10.1103/physrevd.58.052001

Cited by 158 publications

(112 citation statements)

References 34 publications

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“…When trying to measure properties of a heavy particle or characteristics of its decay, it is often necessary to reconstruct the whole decay chain (e.g. the first measurements of the top quark mass with the DØ experiment already reconstructed all possible assignments of reconstructed objects with the partons from the top quark 107 6 Analysis Strategy and Software Algorithms decay (see [202] and [203]). Another example is the measurement of the helicity fractions of W bosons from top quark decays [204]).…”

Section: A Multi-process Factory Analysismentioning

confidence: 99%

Measurement of the electroweak top quark production cross section and the CKM matrix element Vtb with the D0 experiment

Kirsch

2009

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Diese Dissertation ist auf den Internetseiten der Hochschulbibliothek online verfügbar. ZusammenfassungIn der vorliegenden Analyse wird in einem etwa 1 fb −1 an integrierter Luminosität umfassenden Datensatz des DØ-Experiments nach der Produktion einzelner Top-Quarks mittels elektroschwacher Wechselwirkung gesucht. Die Ereignisse wurden am Tevatron-Beschleuniger des Fermi National Accelerator Laboratory, angesiedelt in Batavia, IL, USA, in ProtonAntiproton-Kollisionen bei einer Schwerpunktsenergie von √ s = 1.96 TeV aufgezeichnet. Die Analyse konzentriert sich dabei auf die Messung des kombinierten Wirkunsquerschnitts des s-(tb) und des t-Kanal-(tqb) Produktionsmechanismus:pp → tb + X, tqb + X.Betrachtet werden hierbei Endzustände in denen das W Boson, welches beim Zerfall des Top-Quarks entsteht, im Weiteren in ein Elektron oder ein Myon sowie ein entsprechendes Neutrino zerfällt. Dieser Wirkungsquerschnitt ist direkt proportional zum Quadrat des CKMMatrixelements |V tb | und erlaubt somit dessen Messung ohne zusätzliche Annahmenüber die Unitarität der CKM-Matrix oder die Anzahl der Fermion-Generationen im Standardmodell der Elementarteilchenphysik. Eine Messung des Produktionswirkungsquerschnittes einzelner Top-Quarks ermöglicht somit einen direkten Test der V-A-Struktur der elektroschwachen Wechselwirkung. Die Ereignisse werden zunächst in einer sogenannten IntroductionTo understand the composition of matter and the fundamental forces of nature is an aim that has been driving human kind for centuries. On large scales the theory of general relativity [1] describes the clustering of galaxies and the movement of planets around the sun due to gravity. The theory of general relativity extends the Newtonian gravity [2] that is able to explain the falling of apples from trees. On small scales, scattering experiments are performed to find the elementary particles matter is built of. It has been shown that atoms consist of electrons and nucleons [3], and that even the nucleons are not elementary. Their basic constitutents are called quarks [4]. The quark model led to the development of Quantum ChromoDynamics (QCD), explaining the behaviour of the strong force. Furthermore, the weak and the electromagnetic forces could be unified in the Glashow-Weinberg-Salam (GWS) model. Building upon much earlier work, in the 1960s and 1970s the Standard Model of elementary particle physics was developed, a quantum field theory describing the interactions at very small scales, including all fundamental forces except for gravity.At particle accelerators the Standard Model has been tested and will be tested further to a great precision [5]. The data analyzed in this thesis have been collected at the world's highest energetic-collider, the Tevatron, located at the Fermi National Accelerator Laboratory (FNAL) in the vicinity of Chicago, IL, USA. There, protons and antiprotons are collided at a center-of-mass energy of √ s = 1.96 TeV. The discovery of the top quark [6,7] was one of the remarkable results not only for the CDF and DØ exp...

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Section: A Multi-process Factory Analysismentioning

confidence: 99%

Measurement of the electroweak top quark production cross section and the CKM matrix element Vtb with the D0 experiment

Kirsch

2009

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“…The likelihood discriminant is built in the following way: • The variables are transformed using arbitrary functions in order to allow for a convenient fit of the logarithm of S/B with a polynomial function [84]. The functions used are:…”

Section: Construction Of the Discriminantmentioning

confidence: 99%

Measurement of the W boson helicity in t$\bar{t}$ decays

Schmitt

2005

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“…The experiments CDF and DØ, taking data at the Tevatron proton-antiproton collider located at the Fermi National Accelerator Laboratory, have published several direct experimental measurements of the pole mass, M top , of the top quark t [1,2,3,4,5,6,7,8,9,10,11]. The measurements are based on Run I data (1992)(1993)(1994)(1995)(1996) and utilize all decay topologies arising in tt production given by the leptonic or hadronic decay of the W boson occurring in top-quark decay: the di-lepton channel (di-l) [1,2,3,4,5], the lepton+jets channel (l+j) [6,7,8,9,10], and the all-jets channel (all-j) analysed by CDF only [11].…”

Section: Introductionmentioning

confidence: 99%

“…The measurements are based on Run I data (1992)(1993)(1994)(1995)(1996) and utilize all decay topologies arising in tt production given by the leptonic or hadronic decay of the W boson occurring in top-quark decay: the di-lepton channel (di-l) [1,2,3,4,5], the lepton+jets channel (l+j) [6,7,8,9,10], and the all-jets channel (all-j) analysed by CDF only [11]. The lepton+jets channel yields the most precise determination of M top .…”

Section: Introductionmentioning

confidence: 99%

Combination of CDF and D0 results on the top-quark mass

Collaboration¹,

Collaboration²,

Group³

2005

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The results on the measurements of the top-quark mass, based on the data collected by the Tevatron experiments CDF and DØ at Fermilab during Run I from 1992 to 1996, are summarized. The combination of the published results, taking correlated uncertainties properly into account, is presented. The resulting world average for the mass of the top quark is:2 , where the total error of consists of a statistical part of 2.7 GeV/c 2 and a systematic part of 3.3 GeV/c 2 .

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Direct measurement of the top quark mass by the DØ Collaboration

Cited by 158 publications

References 34 publications

Measurement of the electroweak top quark production cross section and the CKM matrix element Vtb with the D0 experiment

Measurement of the electroweak top quark production cross section and the CKM matrix element Vtb with the D0 experiment

Measurement of the W boson helicity in t$\bar{t}$ decays

Combination of CDF and D0 results on the top-quark mass

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