Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Production Cross Section in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:m

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doi:10.1103/physrevlett.97.082004

Cited by 75 publications

(14 citation statements)

References 29 publications

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“…The cross section for this process has been calculated as 6.77 ± 0.42 pb for a top mass at 175 GeV [71]. The tt system has been extensively studied at the Tevatron and the measured cross section in all decay channels agrees well with theory [19,14,16,15,25,26,27,24,31,30]. The leading order Feynman diagrams for tt production are shown in 2 In Eq.…”

Section: The Top Quarksupporting

confidence: 50%

Evidence for electroweak top quark production in proton-antiproton collisions at √s = 1.96 TeV

Gadfort¹

2007

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Section: The Top Quarksupporting

confidence: 50%

Evidence for electroweak top quark production in proton-antiproton collisions at √s = 1.96 TeV

Gadfort¹

2007

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“…To predict the number of events for each type of background, we used the same method as was used by the top production cross-section measurement in L+J channel [76].…”

Section: Background Expectationsmentioning

confidence: 99%

“…The predicted number of the signal and background expectations obtained from the cross-section analysis [76] already contains the systematic uncertainties. However the MC modeling of the geometrical and kinematic acceptance includes the effects of parton distribution functions (PDFs), initial and final state radiation (ISR and FSR) and jet energy scale which are sources of the systematic uncertainty.…”

Section: Systematicsmentioning

confidence: 99%

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Study of the top quark electric charge at the CDF experiment

Bartoš

2011

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AcknowledgementsFirst of all I would like to express my great thanks to my supervisor doc. RNDr.Stanislav Tokár, CSc. for his support. He advised me to became a part of the CDF collaboration at Fermilab, where I met a lot of excellent physicists. He always had time to answer my questions, helped me to understand the present high energy physics as well as discussed with me any analysis result or any problem -physical or technical -that I met during my study.My special thanks belongs to Veronica Sorin for her guiding me trough the analysis, she has taught me how to negotiate the problems by a further studies. Her enthusiasm for the work inspired me.I want to thanks also to other members of the top charge group -Veronique Boisvert, Yen-Chu Chen, Andy Beretvas, Jaroslav Antos, from whom I learned many things trough the discussions on our weekly meetings. Kl 'úč ové slová: náboj top kvarku, experiment CDF, váhovanie náboja trekov, b-jet. AbstractWe report on the measurement of the top quark electric charge using the jet charge of data, that the p-value under the standard model hypothesis is equal to 13.4%, while the p-value under the exotic model hypothesis is equal to 0.014%. Using the a priori criteria generally accepted by the CDF collaboration, we can say that the result is consistent with the standard model, while we exclude an exotic quark hypothesis with 95% confidence. Using the Bayesian approach, we obtain for the Bayes factor (2ln(BF )) a value of 19.6, that favors very strongly the SM hypothesis over the XM one. The presented method has the highest sensitivity to the top quark electric charge among the presented so far top quark charge analysis.

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“…We summarize the systematic uncertainties of backgrounds in both the single lepton and di-lepton signatures (the terms The method of predicting misidentified heavy flavor (mistag rates) by applying a parameterization of the rate for a light-quark jet or gluon jet being mis-identified as jet from a a charm or bottom quark to jets in a sample before heavy flavor identification contributes a significant systematic uncertainty to the background estimates. We vary the mistag probability calculated by the standard CDF algorithm used in the measurement of the top quark cross-section [58] jet-by-jet by ±15 % (i.e. a factor of 0.85 or 1.15) to estimate the contribution to the uncertainty.…”

Section: Systematic Uncertainties Of the Backgroundsmentioning

confidence: 99%

A Limit on the Branching Ratio of the Flavor-Changing Top Quark Decay T→Zc

Paramonov¹

2009

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We have used the Collider Detector at Fermilab (CDF-II) to set upper limits on the branching ratio of the flavor-changing neutral-current (FCNC) top quark decay t → Zc using a technique employing ratios of W and Z production, measured in 1.52 fb −1 of pp data. The analysis uses a comparison of two decay chains, pp → tt → W bW b → νbjjb and pp → tt → ZcW b → + − cjjb, to cancel systematic uncertainties in acceptance, efficiency, and luminosity. We validate the MC modeling of acceptance and efficiency for lepton identification over the multi-year dataset also using a ratio of W and Z production, in this case the observed ratio of inclusive production of W to Z-bosons, a technique that will be essential for precision comparisons with the standard model at the LHC. We introduce several methods of determining backgrounds to the W and Z samples. To improve the discrimination against SM backgrounds to top quark decays, we calculate the top mass for each event with two leptons and four jets assuming it is a tt event with one of the top quarks decaying to I am blessed to find so many good friends at the University of Chicago, I highly treasure all the time spent together. I thank

show abstract

Measurement of thett¯Production Cross Section inpp¯Collisions ats

Cited by 75 publications

References 29 publications

Evidence for electroweak top quark production in proton-antiproton collisions at √s = 1.96 TeV

Evidence for electroweak top quark production in proton-antiproton collisions at √s = 1.96 TeV

Study of the top quark electric charge at the CDF experiment

A Limit on the Branching Ratio of the Flavor-Changing Top Quark Decay T→Zc

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