Search for single-top production in $ep$ collisions at HERA

Abramowicz, H.; Abt, I.; Adamczyk, L.; Adamus, M.; Aggarwal, R.; Antonelli, S.; Antonioli, P.; Antonov, A.; Arneodo, M.; Aushev, V.

doi:10.1016/j.physletb.2012.01.025

Search for single-top production in $ep$ collisions at HERA

ZEUS

Collaboration

Nov, 2011

10 pages

Published in:

Phys.Lett.B 708 (2012) 27-36

Published: Feb 14, 2012

e-Print:

1111.3901 [hep-ex]

DOI:

10.1016/j.physletb.2012.01.025

Report number:

DESY-11-204

Experiments:

DESY-HERA-ZEUS

View in:

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Abstract: (Elsevier)

A search for single-top production, ep→etX , has been performed with the ZEUS detector at HERA using data corresponding to an integrated luminosity of 0.37 fb−1 . No evidence for top production was found, consistent with the expectation from the Standard Model. Limits were computed for single-top production via flavour changing neutral current transitions involving a neutral electroweak vector boson, γ or Z . The result was combined with a previous ZEUS result yielding a total luminosity of 0.50 fb−1 . A 95% credibility level upper limit of 0.13 pb was obtained for the cross section at the centre-of-mass energy of s=315 GeV .

Note:

Included approximate NLO and NNLO corrections to the cross section calculation used to derive coupling limit for the top production mediated by gamma exchange. 30 pages, 5 figures, 3 tables. Published in Phys. Lett. B 708 (2012) 27

top: single production
neutral current: flavor changing
electron p: interaction
DESY HERA Stor
ZEUS
lepton: transverse momentum
transverse momentum: missing-energy
channel cross section: upper limit
top: coupling
experimental results

References(77)

Figures(0)

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