Theory Uncertainties for Higgs and Other Searches Using Jet Bins - INSPIRE

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Theory Uncertainties for Higgs and Other Searches Using Jet Bins

Iain W. Stewart
(
- MIT and
- Harvard U.
)
,
Frank J. Tackmann
(
- MIT
)

Jul, 2011

13 pages

Published in:

Phys.Rev.D 85 (2012) 034011

e-Print:

1107.2117 [hep-ph]

DOI:

10.1103/PhysRevD.85.034011

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Abstract: (arXiv)

Bounds on the Higgs mass from the Tevatron and LHC are determined using exclusive jet bins to maximize sensitivity. Scale variation in exclusive fixed-order predictions underestimates the perturbative uncertainty for these cross sections, due to cancellations between the perturbative corrections leading to large K factors and those that induce logarithmic sensitivity to the jet-bin boundary. To account for this, we propose that scale variation in the fixed-order calculations should be used to determine theory uncertainties for inclusive jet cross sections, whose differences yield exclusive jet cross sections. This yields a theory correlation matrix for the jet bins such that the additional uncertainty from large logarithms due to the jet boundary cancels when neighboring bins are added. This procedure is tested for H + 0, 1 jets, WW + 0 jets, and W + 0, 1, 2 jets, and found to be generally applicable. For a case where the higher-order resummation of the jet boundary corrections is known, we show that this procedure yields fixed-order uncertainties which are theoretically consistent with those obtained in the resummed calculation.

Note:

13 pages, 4 figures; v2: journal version

14.80.Bn
13.85.Qk
12.38.Cy
13.87.Ce
Higgs particle: mass
sensitivity
Batavia TEVATRON Coll
CERN LHC Coll
resummation
jet: production

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