Search For S Channel Single Top Quark Production In Pp Collisions At S PDF Download
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| Release | : 2016 |
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Download Search for S Channel Single Top Quark Production in Pp Collisions at $\sqrt{s}$ Book in PDF, ePub and Kindle
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.
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| Release | : 2016 |
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Download Search for S Channel Single Top Quark Production in Pp Collisions at √s Book in PDF, ePub and Kindle
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| Total Pages | : 19 |
| Release | : 2014 |
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Download Search for S-channel Single Top-quark Production in Proton-proton Collisions at [arrow]" Book in PDF, ePub and Kindle
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.
| Author | : Philip Michael Perea |
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| Total Pages | : 458 |
| Release | : 2006 |
| Genre | : Collisions (Nuclear physics) |
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Download Search for T-channel Single Top Quark Production in Pp ̄collisions at 1.96 TeV Book in PDF, ePub and Kindle
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| Release | : 2011 |
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Download Measurement of the T-Channel Single Top Quark Production Cross Section in Pp Collisions at Sqrt[s] Book in PDF, ePub and Kindle
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.
| Author | : Philip Michael Perea |
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| Total Pages | : 416 |
| Release | : 2006 |
| Genre | : Collisions (Nuclear physics) |
| ISBN | : 9780542800849 |
Download Search for T-channel Single Top Quark Production in Pp {u02C9}collisions at 1.96 TeV Book in PDF, ePub and Kindle
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.
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| Total Pages | : 9 |
| Release | : 2005 |
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Download Search for Single Top Quark Production in P Anti-p Collisions at S**1/2 Book in PDF, ePub and Kindle
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.
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| Total Pages | : 12 |
| Release | : 2013 |
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Download Evidence for S-channel Single Top Quark Production in $p\bar{p}$ Collisions at $\sqrt{s}$ Book in PDF, ePub and Kindle
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| Release | : 2005 |
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Download Top Physics: Search for Electroweak Single Top Quark Production in P Anti-p Collisions at S**(1/2) Book in PDF, ePub and Kindle
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.
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| Total Pages | : 19 |
| Release | : 2014 |
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Download Search for S -channel Single Top-quark Production in Proton{u2013}proton Collisions at {u221A}s Book in PDF, ePub and Kindle
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.
