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Study of b-quark mass effects in multijet topologies with the DELPHIdetector at LEP
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärn- och partikelfysik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för kärn- och partikelfysik, Högenergifysik.
2008 (engelsk)Inngår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 55, nr 4, s. 525-538Artikkel i tidsskrift (Fagfellevurdert) 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.

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2008. Vol. 55, nr 4, s. 525-538
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URN: urn:nbn:se:uu:diva-87782DOI: 10.1140/epjc/s10052-008-0631-5ISI: 000256930200001OAI: oai:DiVA.org:uu-87782DiVA, id: diva2:133593
Prosjekter
DELPHI Collaboration
Merknad
Report number arXiv:0804.3883 ; CERN-PH-EP-2007-011 Tilgjengelig fra: 2009-01-13 Laget: 2009-01-13 Sist oppdatert: 2017-12-14bibliografisk kontrollert

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