7,873 research outputs found
TOP2017: Experimental Summary
At the time of the 10th International Workshop on Top Quark Physics
(TOP2017), top quark physics is a very dynamic research area. Thanks to the
unprecedentedly fast accumulation of high-energy data at the LHC during the
ongoing Run~2, statistical starvation is a matter of the past for most of the
traditional top-quark analyses, that are now experiencing the luxury of having
to worry about how to punch through the "Systematics Wall" and maximize the
utility of their data. New processes involving top quarks are being studied for
the first time, and the good old pair-production processes are being explored
in unusual settings, such as collisions involving heavy ions, or "reference
data" collected by the LHC at relatively low centre-of-mass energy. The TOP2017
conference featured 37 talks delivered by experimental physicists, including
seven in the "Young Scientists Forum" where young colleagues were given the
opportunity to elaborate more deeply than usual on their own work. As it is
impossible to do justice to all the experimental results presented at this
conference while staying within a reasonable length, this document contains a
very biased selection, mostly based on the personal taste of the author.Comment: Proceedings of the 10th International Workshop on Top Quark Physics,
Braga, Portugal, September 17-22, 201
Single top-quark production at the Tevatron and the LHC
This paper provides a review of the experimental studies of processes with a
single top quark at the Tevatron proton-antiproton collider and the LHC
proton-proton collider. Single top-quark production in the t-channel process
has been measured at both colliders. The s-channel process has been observed at
the Tevatron, and its rate has been also measured at the center-of-mass energy
of 8 TeV at the LHC in spite of the comparatively harsher background
contamination. LHC data also brought the observation of the associated
production of a single top quark with a W boson as well as with a Z boson. The
Cabibbo-Kobayashi-Maskawa matrix element |Vtb| is extracted from the
single-top-quark production cross sections, and t-channel events are used to
measure several properties of the top quark and set constraints on models of
physics beyond the Standard Model. Rare final states with a single top quark
are searched for, as enhancements in their production rates, if observed, would
be clear signs of new physics.Comment: 44 pages, accepted by to Review of Modern Physic
Working Group 5: Physics with Heavy Flavours
This paper summarises a few selected topics discussed during Working Group 5
of the Deep Inelastic Scattering 2017 conference, Physics with Heavy Flavours,
related to the study of charm, bottom, and top quark physics. While the
programme of this Working Group was structured by thematic areas, this
conference was the occasion for intense cross-pollination between traditionally
disjoint research lines. The four LHC experiments all contribute to
heavy-flavour physics, with some degree of overlap in most areas, while
experiments at other accelerators provide vital input in complimentary
kinematic regions. Theorists now have the possibility to take inputs from more
sources, and experimentalists focus on measurements that maximise utility. The
interplay of LHC heavy quark cross-section measurements with DIS expertise is
greatly improving PDF precision, leading to much improved models that, amongst
other things, better inform the prospects for future colliders.Comment: 14 pages, 11 figures, to appear in the proceedings of 25th
International Workshop on Deep Inelastic Scattering and Related Topics (DIS
2017), 3-7 April 2017, University of Birmingham, U
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Particle Identification with Energy Loss in the CMS Silicon Strip Tracker
Some complementary methods are proposed for an identification of charged particles based on in the silicon microstrip modules of the CMS Tracker. The performance of proton selection is discussed as benchmark, and the impact of the main systematic effects is estimated. Strategies are presented for the validation and calibration of the methods with several categories of data
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