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

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

The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron pp[over ] collider. Using a 0.9 fb(-1) dataset, we apply a multivariate analysis to separate signal from background and measure sigma(pp[over ]-->tb+X,tqb+X)=4.9+/-1.4 pb. The probability...

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Veröffentlicht in:Physical review letters 2007-05, Vol.98 (18), p.181802-181802
Hauptverfasser: 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, Alton, A, Alverson, G, Alves, G A, Anastasoaie, M, Ancu, L S, Andeen, T, Anderson, S, Andrieu, B, Anzelc, M S, Arnoud, Y, Arov, M, Askew, A, Asman, B, Assis Jesus, A C S, Atramentov, O, Autermann, C, Avila, C, Ay, C, Badaud, F, Baden, A, Bagby, L, Baldin, B, Bandurin, D V, Banerjee, P, Banerjee, S, Barberis, E, Bargassa, P, Baringer, P, Barnes, C, Barreto, J, Bartlett, J F, Bassler, U, Bauer, D, Beale, S, Bean, A, Begalli, M, Begel, M, Belanger-Champagne, C, Bellantoni, L, Bellavance, A, Benitez, J A, Beri, S B, Bernardi, G, Bernhard, R, Berntzon, L, Bertram, I, Besançon, M, Beuselinck, R, Bezzubov, V A, Bhat, P C, Bhatnagar, V, Binder, M, Biscarat, C, Blackler, I, Blazey, G, Blekman, F, Blessing, S, Bloch, D, Bloom, K, Boehnlein, A, Boline, D, Bolton, T A, Boos, E E, Borissov, G, Bos, K, Bose, T, Brandt, A, Brock, R, Brooijmans, G, Bross, A, Brown, D, Buchanan, N J, Buchholz, D, Buehler, M, Buescher, V, Bunichev, V, Burdin, S, Burke, S, Burnett, T H, Busato, E, Buszello, C P, Butler, J M, Calfayan, P, Calvet, S, Cammin, J, Caron, S, Carvalho, W, Casey, B C K, Cason, N M
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Sprache:eng
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Zusammenfassung:The D0 Collaboration presents first evidence for the production of single top quarks at the Fermilab Tevatron pp[over ] collider. Using a 0.9 fb(-1) dataset, we apply a multivariate analysis to separate signal from background and measure sigma(pp[over ]-->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 a signal is 0.035%, corresponding to a 3.4 standard deviation significance. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa matrix element that describes the Wtb coupling and find 0.68
ISSN:0031-9007
DOI:10.1103/PhysRevLett.98.181802