[Seminars] Today's lunch seminar

Yasuyuki Okumura Yasuyuki.Okumura at cern.ch
Mon Mar 31 06:11:46 CDT 2014

Dear all,

Today's lunch seminar will be given by Matteo Cremonesi (Oxford / UChicago)
for the recent observation of the s-channel single top production process
at Tevatron.
I hope you may join the discussion.

Regards, Yasu

Title : "Observation of s-channel single-top-quark production at the


Studies of the properties of the top quark are being actively pursued at
the Fermilab's Tevatron and at the CERN LHC.  Besides top-antitop pair
production by strong interaction, which is the most common production
mechanism, the less common single-top production via electroweak
interaction is now being tackled.

Collisions that produce a single top quark through the weak nuclear force
are rarer, and the events are much less distinctive than top pairs.
According to the Standard Model, single-top production can be induced by
several amplitudes. Production through the exchange of a virtual W boson in
the s-channel is very hard to isolate. This production channel is barely
accessible at the Tevatron and is presently out of reach at the higher
energy LHC. On the other hand, new physics effects might most readily show
up in this channel. The observation of this production channel was one of
the ultimate goals of the Tevatron.

The analysis methods adopted by the CDF and D0 experiments to isolate
s-channel single-top quark production will be described. The speaker will
illustrate the main analysis features, underling the challenges and
describing the techniques employed in order to accomplish such a difficult
task. The CDF and D0 results will be shown, claiming discovery by combining
them - a unique case in HEP.

University of Chicago - Fermilab - ATLAS
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