Evidence for production of single top quarks and first direct measurement of |Vtb|

Journal Article · Fri Dec 01 04:00:00 EST 2006 · Phys.Rev.Lett.98:181802,2007

OSTI ID:900835

Abazov, V M; Abbott, B; Abolins, M; Acharya, B S; Adams, M; Adams, T; Aguilo, E; Ahn, S H; Ahsan, M; Alexeev, G D; Alkhazov, G

The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron p{bar p} collider. Using a 0.9 fb{sup -1} dataset, we apply a multivariate analysis to separate signal from background and measure {sigma}(p{bar p} {yields} tb + X, tqb + X) = 4.9 {+-} 1.4 pb. The probability to measure a cross section at this value or higher in the absence of signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the CKM matrix element that describes the W tb coupling and find 0.68 < |V{sub tb}| {le} 1 at 95% C.L.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 900835
• Report Number(s): FERMILAB-PUB-06-475-E; arXiv eprint number hep-ex/0612052
• Journal Information: Phys.Rev.Lett.98:181802,2007, Journal Name: Phys.Rev.Lett.98:181802,2007 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
Experiment-HEP
FERMILAB TEVATRON
MATRIX ELEMENTS
MULTIVARIATE ANALYSIS
PROBABILITY
PRODUCTION
T QUARKS