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Using the hadronic multiplicity to distinguish real W’s from QCD jet backgrounds

Gunion, J. F. and Kane, G. L. and Sadrozinski, H. F.-W. and Seiden, A. and Yuan, C. P. and Weinstein, Alan J. (1989) Using the hadronic multiplicity to distinguish real W’s from QCD jet backgrounds. Physical Review D, 40 (7). pp. 2223-2230. ISSN 2470-0010. doi:10.1103/PhysRevD.40.2223.

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In order to study WW scattering or the decay of a heavy standard-model Higgs boson in the TeV region, it is necessary to use the channel W(→lν)+W(→jets). However, techniques are required for suppressing the severe background from mixed electroweak-QCD production of W+jets. We demonstrate that the charged multiplicity of the events can provide an extremely useful tool for distinguishing a jet system originating via real W decay from a jet system produced by the mixed electroweak-QCD processes. Analogous techniques will be useful for any process involving W’s→jets, whenever the W decaying to jets has pt≫mW and the primary background produces jets predominantly in a color-nonsinglet state; however the precise procedure must be optimized separately for each such process.

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Weinstein, Alan J.0000-0002-0928-6784
Additional Information:©1989 The American Physical Society Received 18 January 1989 One of us (J.F.G.) would like to thank the Institute for Theoretical Physics at University of California at Santa Barbara for its hospitality during the course of writing this paper. In addition, we would like to thank Hans Uno Bengtsson and Bryan Webber for several helpful discussions regarding angular ordering and color structuring of the Monte Carlo programs. Finally, we would like to acknowledge many stimulating discussions with M. Golden, I. Hincliffe, F. Paige, and M. Shapiro. This work was supported in part by the Department of Energy under Grants Nos. DE-AS03-76ER70191, DE-AC03-76SF00098, and DE-AM03-F00010, and by the National Science Foundation under Grant No. PHY82-17853, supplemented by funds from the National Aeronautics and Space Administration.
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Deposited On:14 Dec 2006
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