QCD corrections to hadronicWγproduction with nonstandardWWγcouplings

Abstract

The process p(G + W* -y + x + livy t-x is calculated to O ( a , ) for general CP-conserving WWy couplings. At the Fermilab Tevatron center-of-mass energy, the QCD corrections to Wy production are modest, and the Born and incllisive O(a,) cross sections have similar sensitivities to the effects of anomalous couplings. At supercollider energies, the inclusive QCD corrections are large at high photon transverse momenta, reducing the sensitivity to nonstandard WWy couplings by up to a factor 2. The size of the QCD corrections can be reduced significantly, and a large fraction of the sensitivity lost can be regained, if a jet veto is imposed. PACS nunlber(s): 13.85.Qk, 12.38.I3x, 14.80.Er

Establishing jet scaling patterns with a photon

“…on the jet-photon R distance limits the phase space of soft gluon emission and is infrared unsafe. We instead define an isolated photon through a hadronic energy deposit of less than 10% of p T,γ in a cone of size R < 0.4 centered around the photon direction [56][57][58]. If this criterion is not met the photon candidate is pushed into the jet finding algorithm.…”

“…We reconstruct jets using the anti-k T algorithm from FastJet [53][54][55] with R anti−k T = 0.4, which gives us a very moderate geometric separation of two jets. When dealing with photons in a QCD environment some familiar subtleties have to be considered [56][57][58][59][60][61]: a photon can arise from non-perturbative fragmentation. Those photons are not useful in our case since our focus is obviously not on QED corrections to multi-jet production rates.…”

The two-loop master integrals for $ q\overline{q} $ → VV

“…The full set of NLO QCD corrections [1][2][3][4] and large parts of the NLO electroweak corrections [5][6][7][8][9][10] have been derived for vector boson pair production. NNLO QCD corrections were calculated up to now for γγ [11] and Zγ [12] production.…”

Search forWWandWZResonances Decaying to Electron, MissingET, and Two Jets inAaltonen1, Adelman2, González3 et al. 2010Phys. Rev. Lett.304240View full textAdd to dashboardCite

“…Figure 1 shows the resulting E 6 T spectrum for events with an electron and two jets that would have passed the event selection criteria except for the E 6 T > 30 GeV cut. The systematic uncertainties taken into account in the background calculations are the following, listed by decreasing significance: jet energy scale (JES) uncertainty [21], theoretical cross section uncertainty [22], luminosity uncertainty [23], and jet misidentification rate uncertainty. The dominating systematic uncertainty is the JES uncertainty which amounts to $13% of the estimated background.…”