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Study of b-quark mass effects in multijet topologies with the DELPHIdetector at LEP
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear and Particle Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
2008 (English)In: European Physical Journal C, ISSN 1434-6044, Vol. 55, no 4, 525-538 p.Article in journal (Refereed) Published
Abstract [en]

The effect of the heavy b-quark mass on the two, three and four-jet rates isstudied using LEP data collected by the DELPHI experiment at the Z peak in1994 and 1995. The rates of b-quark jets and light quark jets (l = uds) inevents with n = 2, 3, and 4 jets, together with the ratio of two andfour-jet rates of b-quarks with respect to light-quarks, R_n^bl, have beenmeasured with a double-tag technique using the CAMBRIDGE jet-clusteringalgorithm. A comparison between experimental results and theory (matrixelement or Monte Carlo event generators such as PYTHIA, HERWIG and ARIADNE)is done after the hadronisation phase. Using the four-jet observable R_4^bl,a measurement of the b-quark mass using massive leading-order calculationsgives: m_b(M_Z) = 3.76 +/- 0.32 (stat) +/- 0.17 (syst) +/- 0.22 (had) +/-0.90 (theo) GeV/c^2 . This result is compatible with previous three-jetdeterminations at the M_Z energy scale and with low energy mass measurementsevolved to the M_Z scale using QCD Renormalisation Group Equations.

Place, publisher, year, edition, pages
2008. Vol. 55, no 4, 525-538 p.
National Category
Subatomic Physics
Research subject
Nuclear Physics
URN: urn:nbn:se:uu:diva-87782DOI: 10.1140/epjc/s10052-008-0631-5ISI: 000256930200001OAI: oai:DiVA.org:uu-87782DiVA: diva2:133593
DELPHI Collaboration
Report number arXiv:0804.3883 ; CERN-PH-EP-2007-011 Available from: 2009-01-13 Created: 2009-01-13 Last updated: 2010-01-14Bibliographically approved

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Nuclear and Particle PhysicsHigh Energy Physics
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Subatomic Physics

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