Measurement of the ratio of the $p \bar{p} \to W^+ c^-$ jet cross section to the inclusive $p \bar{p} \to W +$ jets cross section - INSPIRE

DataBETA

Measurement of the ratio of the $p \bar{p} \to W^+ c^-$ jet cross section to the inclusive $p \bar{p} \to W +$ jets cross section

D0

Collaboration

Mar, 2008

10 pages

Published in:

Phys.Lett.B 666 (2008) 23-30

e-Print:

0803.2259 [hep-ex]

DOI:

10.1016/j.physletb.2008.06.067

Report number:

FERMILAB-PUB-08-062-E

Experiments:

FNAL-E-0823

View in:

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Abstract: (Elsevier)

We present a measurement of the fraction of inclusive W+jets events produced with net charm quantum number ±1, denoted W+c -jet, in pp¯ collisions at s=1.96 TeV using approximately 1 fb −1 of data collected by the DØ detector at the Fermilab Tevatron Collider. We identify the W+jets events via the leptonic W boson decays. Candidate W+c -jet events are selected by requiring a jet containing a muon in association with a reconstructed W boson and exploiting the charge correlation between this muon and W boson decay lepton to perform a nearly model-independent background subtraction. We measure the fraction of W+c -jet events in the inclusive W+jets sample for jet pT>20 GeV and pseudorapidity |η|<2.5 to be 0.074±0.019(stat.)±0.0140.012(syst.) , in agreement with theoretical predictions. The probability that background fluctuations could produce the observed fraction of W+c -jet events is estimated to be 2.5×10−4 , which corresponds to a 3.5 σ statistical significance.

Note:

submitted to Physics Letters B

13.85.Ni
14.70.Fm
12.38.Qk
12.15.Ji
13.85.Qk
14.65.Dw
anti-p p: colliding beams
W: hadroproduction
W: leptonic decay
jet: associated production

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