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Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP
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DELPHI Collaboration (Including: Barker, Gary John). (2008) Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP. The European Physical Journal C, Vol.55 (No.4). doi:10.1140/epjc/s10052-008-0631-5 ISSN 1434-6044.
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Official URL: http://dx.doi.org/10.1140/epjc/s10052-008-0631-5
Abstract
The effect of the heavy b-quark mass on the two, three and four-jet rates is studied using LEP data collected by the DELPHI experiment at the Z peak in 1994 and 1995. The rates of b-quark jets and light quark jets (l=uds) in events with n=2, 3, and 4 jets, together with the ratio of two and four-jet rates of b-quarks with respect to light-quarks, Rn bl, have been measured with a double-tag technique using the CAMBRIDGE jet-clustering algorithm. A comparison between experimental results and theory (matrix element or Monte Carlo event generators such as PYTHIA, HERWIG and ARIADNE) is done after the hadronisation phase. Using the four-jet observable R4 bl, a measurement of the b-quark mass using massive leading-order calculations gives: This result is compatible with previous three-jet determinations at the MZ energy scale and with low energy mass measurements evolved to the MZ scale using QCD renormalisation group equations.
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