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SUMMARY:Electroweak physics in the forward region - Marek Sirendi (Univers
 ity of Cambridge)
DTSTART:20160216T150000Z
DTEND:20160216T160000Z
UID:TALK63114@talks.cam.ac.uk
CONTACT:Rolf Oldeman
DESCRIPTION:The LHCb Electroweak Physics Working Group has an ongoing prog
 ram of measurements of the inclusive W \, Z\, and Z+jets cross-sections an
 d of the charge asymmetry in W production. Measurements of W -> &mu\;&nu\;
 <sub>&mu\;</sub> and Z -> &mu\;&mu\;(ee) have been carried out at 7 and 8 
 TeV. The 2011 dataset has been used to measure cross-sections of Z product
 ion in association with a D meson\, inclusive Z -> &mu\;&mu\; \, Z -> &mu\
 ;&mu\;+jets\, and Z+b-jets. Work on W -> e&nu\;<sub>e</sub> and W (Z) -> &
 mu\;&nu\;<sub>&mu\;</sub> (&mu\;&mu\;)+jets at 8 TeV is ongoing. Measureme
 nts of these decay channels at 13 TeV are also in progress. Recently\, the
  forward-backward asymmetry in Z -> &mu\;&mu\; decays was used to extract 
 the effective weak mixing angle - a fundamental parameter of the SM. Also\
 , a first observation of top quark production in the forward region was ma
 de with a significance of 5.4 sigma.\n\nThe precision measurements of W/Z 
 production performed at LHCb act as tests of QCD and electroweak theory in
  unprobed regions of x-Q<sup>2</sup> phase space. The LHCb detector is uni
 que in the angular coverage of some of its subdetectors and is\, therefore
 \, complementary to the general purpose detectors\, ATLAS and CMS.\nThe cu
 rrent work thus gives crucial knowledge and experience\, acting as a proof
  of principle for these measurements and prospective new physics searches 
 in the\nforward region. Since the detector has high precision tracking\, c
 alorimetry\, and a muon system close to the beamline\, measurements extend
  up to boson rapidities\nof 4.5. Consequently\, partons with extremely low
  (x&asymp\;10<sup>-4</sup> ) and high (x&asymp\;0.1) momentum fractions ar
 e probed. This enables these measurements to be used in constraining PDF s
 ets\, which has an indirect impact on all measurements made at the LHC.\n
LOCATION:Rutherford Seminar Room B
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