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Search For S Channel Single Top Quark Production In Pp Collisions At S
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Book Synopsis Search for S Channel Single Top Quark Production in Pp Collisions at $\sqrt{s}$ by :
Download or read book Search for S 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: A search is presented for single top quark production in the s channel in proton-proton collisions with the CMS detector at the CERN LHC in decay modes of the top quark containing a muon or an electron in the final state. The signal is extracted through a maximum-likelihood fit to the distribution of a multivariate discriminant defined using boosted decision trees to separate the expected signal contribution from background processes. Data collected at centre-of-mass energies of 7 and 8 TeV yield cross sections of 7.1 +/- 8.1 pb and 13.4 +/- 7.3 pb, respectively, and a best fit value of 2.0 +/- 0.9 for the combined ratio of the measured and expected values. The signal significance is 2.5 standard deviations, and the upper limit on the rate relative to the standard model expectation is 4.7 at 95% confidence level.
Book Synopsis Search for S Channel Single Top Quark Production in Pp Collisions at √s by :
Download or read book Search for S 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 Search for S-channel Single Top-quark Production in Proton-proton Collisions at [arrow]" by :
Download or read book Search for S-channel Single Top-quark Production in Proton-proton Collisions at [arrow]" written by and published by . This book was released on 2014 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb-1. The selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of [sigma]s=5.0 " 4.3 pb, consistent with the Standard Model expectation.
Book Synopsis Search for T-channel Single Top Quark Production in Pp ̄collisions at 1.96 TeV by : Philip Michael Perea
Download or read book Search for T-channel Single Top Quark Production in Pp ̄collisions at 1.96 TeV written by Philip Michael Perea and published by . This book was released on 2006 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Search for T-channel Single Top Quark Production in Pp {u02C9}collisions at 1.96 TeV by : Philip Michael Perea
Download or read book Search for T-channel Single Top Quark Production in Pp {u02C9}collisions at 1.96 TeV written by Philip Michael Perea and published by . This book was released on 2006 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: I have performed a search for t-channel single top quark production in pp¯ collisions at 1.96 TeV on a 366 pb-1 dataset collected with the DO detector from 2002--2005. The analysis is restricted to the leptonic decay of the W boson from the top quark to an electron or muon, tqb¯ → lnulb qb¯ (l = e, mu). A powerful b-quark tagging algorithm derived from neural networks is used to identify b jets and significantly reduce background. I further use neural networks to discriminate signal from background, and apply a binned likelihood calculation to the neural network output distributions to derive the final limits. No direct observation of single top quark production has been made, and I report expected/measured 95% confidence level limits of 3.5/8.0 pb.
Book Synopsis Search for Single Top Quark Production in P Anti-p Collisions at S**1/2 by :
Download or read book Search for Single Top Quark Production in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2005 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for electroweak production of single top quarks in the s-channel and t-channel using neural networks for signal-background separation. We have analyzed 230 pb−1 of data collected with the D0 detector at the Fermilab Tevatron Collider at a center-of-mass energy of 1.96 TeV and find no evidence for a single top quark signal. The resulting 95% confidence level upper limits on the single top quark production cross sections are 6.4 pb in the s-channel and 5.0 pb in the t-channel.
Book Synopsis Evidence for S-channel Single Top Quark Production in $p\bar{p}$ Collisions at $\sqrt{s}$ by :
Download or read book Evidence for S-channel Single Top Quark Production in $p\bar{p}$ Collisions at $\sqrt{s}$ written by and published by . This book was released on 2013 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Top Physics: Search for Electroweak Single Top Quark Production in P Anti-p Collisions at S**(1/2) by :
Download or read book Top Physics: Search for Electroweak Single Top Quark Production in P Anti-p Collisions at S**(1/2) written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a search for Standard Model t-channel and s-channel single top quark production in p{bar p} collisions at a center of mass energy of 1.96 TeV. We use a data sample corresponding to 162 pb−1 recorded by the upgraded Collider Detector at Fermilab. We find no significant evidence for electroweak top quark production and set upper limits at the 95% confidence level on the production cross section, consistent with the Standard Model: 10.1 pb for the t-channel, 13.6 pb for the s-channel and 17.8 pb for the combined cross section of t- and s-channel.
Book Synopsis Search for S -channel Single Top-quark Production in Proton{u2013}proton Collisions at {u221A}s by :
Download or read book Search for S -channel Single Top-quark Production in Proton{u2013}proton Collisions at {u221A}s written by and published by . This book was released on 2014 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Letter presents a search at the LHC for s-channel single top-quark production in proton–proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb-1. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of ?s=5.0 ± 4.3 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 Search for Electroweak Single Top Quark Production with Cdf in Proton - Anti-proton Collisions at S**(1/2) by : Thorsten Walter
Download or read book Search for Electroweak Single Top Quark Production with Cdf in Proton - Anti-proton Collisions at S**(1/2) written by Thorsten Walter and published by . This book was released on 2005 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis two searches for electroweak single top quark production with the CDF experiment have been presented, a cutbased search and an iterated discriminant analysis. Both searches find no significant evidence for electroweak single top production using a data set corresponding to an integrated luminosity of 162 pb{sup -1} collected with CDF. Therefore limits on s- and t-channel single top production are determined using a likelihood technique. For the cutbased search a likelihood function based on lepton charge times pseudorapidity of the non-bottom jet was used if exactly one bottom jet was identified in the event. In case of two identified bottom jets a likelihood function based on the total number of observed events was used. The systematic uncertainties have been treated in a Bayesian approach, all sources of systematic uncertainties have been integrated out. An improved signal modeling using the MadEvent Monte Carlo program matched to NLO calculations has been used. The obtained limits for the s- and t-channel single top production cross sections are 13.6 pb and 10.1 pb, respectively. To date, these are most stringent limits published for the s- and the t-channel single top quark production modes.
Author :Stelzer, Bernd Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 :9780494078129 Total Pages :256 pages Book Rating :4.0/5 (781 download)
Book Synopsis Search for Electroweak Single Top Quark Production in 1.96 TeV Proton-antiproton Collisions [microform] by : Stelzer, Bernd
Download or read book Search for Electroweak Single Top Quark Production in 1.96 TeV Proton-antiproton Collisions [microform] written by Stelzer, Bernd and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2005 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the first search for electroweak single top quark production in proton-antiproton collisions at a center of mass energy of 1.96 TeV. The data sample used for this analysis corresponds to 162 pb -1 recorded by the upgraded Collider Detector at Fermilab. The search is performed by doing a classic maximum likelihood fit to the H T distribution in data. The kinematic variable H T is the scalar sum of transverse energies of all final state particles in the event. This variable has the advantage that its distribution looks very similar for both contributing (s-channel and t-channel) single top processes, but is different for background processes. The combination of both channels to one signal improves the sensitivity of the search. No significant evidence for electroweak single top quark production is found and we set an upper limit at the 95% confidence level on the combined single top quark production cross section of 17.8 pb.
Book Synopsis Search for Electroweak Single Top Quark Production in 1.96-TeV Proton-antiproton Collisions by : Bernd Stelzer
Download or read book Search for Electroweak Single Top Quark Production in 1.96-TeV Proton-antiproton Collisions written by Bernd Stelzer and published by . This book was released on 2005 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the first search for electroweak single top quark production in proton-antiproton collisions at a center of mass energy of 1.96 TeV. The data sample used for this analysis corresponds to 162 pb{sup -1} recorded by the upgraded Collider Detector at Fermilab. The search is performed by doing a classic maximum likelihood fit to the H{sub T} distribution in data. The kinematic variable H{sub T} is the scalar sum of transverse energies of all final state particles in the event. This variable has the advantage that its distribution looks very similar for both contributing (s-channel and t-channel) single top processes, but is different for background processes. The combination of both channels to one signal improves the sensitivity of the search. No significant evidence for electroweak single top quark production is found and we set an upper limit at the 95% confidence level on the combined single top quark production cross section of 17.8 pb.
Book Synopsis Search for Wt-channel Single Top Quark Production in 7 TeV Proton-proton Collisions Using the ATLAS Detector by : Dominique Tardif
Download or read book Search for Wt-channel Single Top Quark Production in 7 TeV Proton-proton Collisions Using the ATLAS Detector written by Dominique Tardif and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Anomalous Wtb Couplings and Flavour-changing Neutral Currents in T-channel Single Top Quark Production in Pp Collisions at Sqrt(s) by :
Download or read book Search for Anomalous Wtb Couplings and Flavour-changing Neutral Currents in 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: Single top quark events produced in the t channel are used to set limits on anomalous Wtb couplings and to search for top quark flavour-changing neutral current (FCNC) interactions. The data taken with the CMS detector at the LHC in proton-proton collisions at sqrt(s) = 7 and 8 TeV correspond to integrated luminosities of 5.0 and 19.7 inverse-femtobarns, respectively. The analysis is performed using events with one muon and two or three jets. A Bayesian neural network technique, used to discriminate between the signal and backgrounds, is found to be consistent with the standard model prediction. The 95% confidence level (CL) exclusion limits on anomalous right-handed vector, and left- and right-handed tensor Wtb couplings are measured to be
Book Synopsis Observation of S-channel Production of Single Top Quarks at the Tevatron by :
Download or read book Observation of S-channel Production of Single Top Quarks at the Tevatron written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the first observation of single-top-quark production in the s channel through the combination of the CDF and D0 measurements of the cross section in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV. The data correspond to total integrated luminosities of up to 9.7 fb-1 per experiment. The measured cross section is $\sigma_s = 1.29^{+0.26}_{-0.24}$ pb. The probability of observing a statistical fluctuation of the background to a cross section of the observed size or larger is $1.8 \times 10^{-10}$, corresponding to a significance of 6.3 standard deviations for the presence of an s-channel contribution to the production of single-top quarks.
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