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Measurement Of The T Channel Single Top Quark Production Cross Section And Of The
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Book Synopsis Measurement of the T-channel Single-top-quark Production Cross Section and of the by :
Download or read book Measurement of the T-channel Single-top-quark Production Cross Section and of the written by and published by . This book was released on 2014 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements are presented of the t-channel single-top-quark production cross section in proton-proton collisions at √s = 8 TeV. The results are based on a data sample corresponding to an integrated luminosity of 19.7 fb−1 recorded with the CMS detector at the LHC. The cross section is measured inclusively, as well as separately for top (t) and antitop $ \left(\overline{\mathrm{t}}\right) $, in final states with a muon or an electron. The measured inclusive t-channel cross section is?t-ch. = 83.6 ± 2.3 (stat.) ± 7.4 (syst.) pb. The single t and $ \overline{\mathrm{t}} $ cross sections are measured to be?t-ch.(t) = 53.8 ± 1.5 (stat.) ± 4.4 (syst.) pb and?$_{t-ch.}$ $ \left(\overline{t}\right) $ = 27.6 ± 1.3 (stat.) ± 3.7 (syst.) pb, respectively. The measured ratio of cross sections is Rt-ch. =?t-ch.(t)/?t-ch. $ \left(\overline{\mathrm{t}}\right) $ = 1.95 ± 0.10 (stat.) ± 0.19 (syst.), in agreement with the standard model prediction. The modulus of the Cabibbo-Kobayashi-Maskawa matrix element Vtb is extracted and, in combination with a previous CMS result at √s = 7 TeV, a value.
Book Synopsis Measurement of the T-channel Single Top Quark Production Cross Section by :
Download or read book Measurement of the T-channel Single Top Quark Production Cross Section written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The D0 collaboration reports direct evidence for electroweak production of single top quarks through the t-channel exchange of a virtual W boson. This is the first analysis to isolate an individual single top quark production channel. We select events containing an isolated electron or muon, missing transverse energy, and two, three or four jets from 2.3 fb−1 of p{bar p} collisions at the Fermilab Tevatron Collider. One or two of the jets are identified as containing a b hadron. We combine three multivariate techniques optimized for the t-channel process to measure the t- and s-channel cross sections simultaneously. We measure cross sections of 3.14{sub -0.80}{sup +0.94} pb for the t-channel and 1.05 ± 0.81 pb for the s-channel. The measured t-channel result is found to have a significance of 4.8 standard deviations and is consistent with the standard model prediction.
Book Synopsis Cross Section Measurement of T-channel Single Top Quark Production in Pp Collisions at $\sqrt{s} by :
Download or read book Cross Section Measurement of T-channel Single Top Quark Production in Pp Collisions at $\sqrt{s} written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The cross section for the production of single top quarks in the $t$ channel is measured in proton-proton collisions at 13 TeV with the CMS detector at the LHC. The analyzed data correspond to an integrated luminosity of 2.3 fb$^{-1}$. The event selection requires one muon and two jets where one of the jets is identified as originating from a bottom quark. Several kinematic variables are then combined into a multivariate discriminator to distinguish signal from background events. A fit to the distribution of the discriminating variable yields a total cross section of 232 $\pm$ 13 (stat) $\pm$ 28 (syst) pb and a ratio of top quark and top antiquark production of $R_{t\textrm{-ch.}}= $ 1.81 $\pm$ 0.18 (stat) $\pm$ 0.15 (syst). From the total cross section the absolute value of the CKM matrix element $V_{\mathrm{tb}}$ is calculated to be 1.03 $\pm$ 0.07 (exp) $\pm$ 0.02 (theo). All results are in agreement with the standard model predictions.
Book Synopsis Measurement of the T-Channel Single Top Quark Production Cross Section in Pp Collisions at Sqrt[s] by :
Download or read book Measurement of the T-Channel Single Top Quark Production Cross Section in Pp Collisions at Sqrt[s] written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Electroweak production of the top quark is measured in pp collisions at sqrt(s) = 7 TeV, using a dataset collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns. With an event selection optimized for t-channel production, two complementary analyses are performed. The first one exploits the special angular properties of the signal, together with background estimates from data. The second approach uses a multivariate analysis technique to probe the compatibility with signal topology expected from electroweak top quark production. The combined measurement of the cross section is 83.6 +/- 29.8 (stat.+syst.) +/- 3.3 (lumi.) pb, consistent with the standard model expectation.
Book Synopsis Measurement of the T-channel Single-top-quark Production Cross Section and of the $\mid V_{tb} \mid$ CKM Matrix Element in Pp Collisions at $\sqrt{s}$ by :
Download or read book Measurement of the T-channel Single-top-quark Production Cross Section and of the $\mid V_{tb} \mid$ CKM Matrix Element in Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2014 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the T-channel Single Top Quark Production Cross Section with the ATLAS Detector at S by : Philipp Sturm
Download or read book Measurement of the T-channel Single Top Quark Production Cross Section with the ATLAS Detector at S written by Philipp Sturm and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the T-channel Single Top Quark Production Cross Section and the CKM Matrix Element V Tb with the CMS Experiment by : Dennis Klingebiel
Download or read book Measurement of the T-channel Single Top Quark Production Cross Section and the CKM Matrix Element V Tb with the CMS Experiment written by Dennis Klingebiel and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Single Top Quark Production Cross Section and by :
Download or read book Measurement of the Single Top Quark Production Cross Section and written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An updated measurement of the single top quark production cross section is presented using the full data set collected by the Collider Detector at Fermilab (CDF), corresponding to 9.5 fb-1 of integrated luminosity from proton-antiproton collisions at 1.96 TeV center-of-mass energy. The events selected contain an imbalance in the total transverse momentum, jets identified as containing b quarks, and no identified leptons. The sum of the s- and t-channel single top quark cross sections is measured to be 3.53-1.16+1.25 pb and a lower limit on the magnitude of the top-to-bottom quark coupling,
Book Synopsis Measurement of the T-channel Single Top Quark Production Cross Section with the ATLAS Detector at S by : Philipp Sturm
Download or read book Measurement of the T-channel Single Top Quark Production Cross Section with the ATLAS Detector at S written by Philipp Sturm and published by . This book was released on 2012 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cross Section Measurement of T-channel Single Top Quark Production in Pp Collisions at √s by :
Download or read book Cross Section Measurement of T-channel Single Top Quark Production in Pp Collisions at √s written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the T-channel Single Top Quark Production Cross Section in the Electron and Muon Decay Channel with the CMS Detector at the LHC by : Daniel Michael Martschei
Download or read book Measurement of the T-channel Single Top Quark Production Cross Section in the Electron and Muon Decay Channel with the CMS Detector at the LHC written by Daniel Michael Martschei and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Single Top Quark Production Cross Section at $\sqrt {s} by :
Download or read book Measurement of the Single Top Quark Production Cross Section at $\sqrt {s} written by and published by . This book was released on 2011 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within the standard model top quarks are predicted to be most often produced in pairs via the strong interaction. However they can also be produced singly through the weak interation. This is a rarer process with many experimental challenges. It is interesting because it provides a new window to search for evidence of physics beyond the standard model picture, such as a fourth generation of quarks or to search for insight into the Higgs Mechanism. Single top production also provides a direct way to calculate the CKM matrix element Vtb. This thesis presents new measurements for single top quark production in the s+t, s and t channels using 5.4 fb-1 of data collected at the DØ detector at Fermilab in Batavia, IL. The analysis was performed using Boosted decision trees to separate signal from background and Bayesian statistcs to calculate all the cross sections.
Book Synopsis Measurement of the T-channel Single Top Quark Production Cross Section and the CKM Matrix Element V Tb with the CMS Experiment by : Dennis Klingebiel
Download or read book Measurement of the T-channel Single Top Quark Production Cross Section and the CKM Matrix Element V Tb with the CMS Experiment written by Dennis Klingebiel and published by . This book was released on 2014 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Electroweak Single Top Quark Production Cross Section and the CKM Matrix Element $ by :
Download or read book Measurement of the Electroweak Single Top Quark Production Cross Section and the CKM Matrix Element $ written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The establishment of the electroweak single top quark production at CDF is experimentally challenging. The small single top signal hidden under large uncertain background processes makes it necessary an excellent understanding of the detector and a detailed study of the processes involved. Moreover, simple counting experiments are not sufficient to extract enough information from the candidate event sample and multivariate analysis techniques are crucial to distinguish signal from background. This thesis presents the world's most sensitive individual search, together with CDF's Neural Network analysis, for the combined s- and t-channel single top production. This analysis uses a dataset that corresponds to an integrated luminosity of 3.2fb-1, and is based on a Boosted Decision Tree method that combines information from several input variables to construct a final powerful discriminant, reaching a sensitivity to the combined single top quark production equivalent to 5.2[sigma]. The measured combined single top quark production cross section is 2.1+0.7 -0.6 pb assuming a top quark mass of 175 GeV/c2. The probability that this result comes from a background-only fluctuation (p-value) is 0.0002, which corresponds to 3.5[sigma].
Book Synopsis Measurement of the Inclusive and Differential T-channel Single Top Quark Production Cross Section at 13 TeV with the CMS Experiment by : David Seith
Download or read book Measurement of the Inclusive and Differential T-channel Single Top Quark Production Cross Section at 13 TeV with the CMS Experiment written by David Seith and published by . This book was released on 2021* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusive and Differential Cross Section Measurements of T-channel Single Top Quark Production at S by : Anne Kathrin Becker
Download or read book Inclusive and Differential Cross Section Measurements of T-channel Single Top Quark Production at S written by Anne Kathrin Becker and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Discovery of Single Top Quark Production by : Dag Gillberg
Download or read book Discovery of Single Top Quark Production written by Dag Gillberg and published by Springer Science & Business Media. This book was released on 2011-01-22 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: The top quark is by far the heaviest known fundamental particle with a mass nearing that of a gold atom. Because of this strikingly high mass, the top quark has several unique properties and might play an important role in electroweak symmetry breaking—the mechanism that gives all elementary particles mass. Creating top quarks requires access to very high energy collisions, and at present only the Tevatron collider at Fermilab is capable of reaching these energies. Until now, top quarks have only been observed produced in pairs via the strong interaction. At hadron colliders, it should also be possible to produce single top quarks via the electroweak interaction. Studies of single top quark production provide opportunities to measure the top quark spin, how top quarks mix with other quarks, and to look for new physics beyond the standard model. Because of these interesting properties, scientists have been looking for single top quarks for more than 15 years. This thesis presents the first discovery of single top quark production. It documents one of the flagship measurements of the D0 experiment, a collaboration of more than 600 physicists from around the world. It describes first observation of a physical process known as “single top quark production”, which had been sought for more than 10 years before its eventual discovery in 2009. Further, his thesis describes, in detail, the innovative approach Dr. Gillberg took to this analysis. Through the use of Boosted Decision Trees, a machine-learning technique, he observed the tiny single top signal within an otherwise overwhelming background. This Doctoral Thesis has been accepted by Simon Fraser University, Burnaby, BC, Canada.
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