Hadronic Z decay data taken with the ALEPH detector at LEP1 are used to measure the three-jet rate as well as moments of various event-shape variables. The ratios of the observables obtained from b-tagged events and from an inclusive sample are determined. The mass of the b. quark is extracted from a fit to the measured ratios using a next-to-leading order prediction including mass effects. Taking the first moment of the y(3) distribution, which is the observable with the smallest hadronization corrections and systematic uncertainties, the result is m(b)(M(z)) = [3.27 +/- 0.22(stat) +/- 0.22(exp) +/- 0.38(had) +/- 0.16(theo)] GeV/c(2) . The measured ratio is alternatively employed to test the flavour independence of the strong coupling constant for b and light quarks.

A measurement of the b-quark mass from hadronic Z decays / Barate, R., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Merle, E., Minard, M.n., Pietrzyk, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., Martinez, M., Merino, G., Miquel, R., Mir, L.m., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 18:1(2000), pp. 1-13. [10.1007/s100520000533]

A measurement of the b-quark mass from hadronic Z decays

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
2000

Abstract

Hadronic Z decay data taken with the ALEPH detector at LEP1 are used to measure the three-jet rate as well as moments of various event-shape variables. The ratios of the observables obtained from b-tagged events and from an inclusive sample are determined. The mass of the b. quark is extracted from a fit to the measured ratios using a next-to-leading order prediction including mass effects. Taking the first moment of the y(3) distribution, which is the observable with the smallest hadronization corrections and systematic uncertainties, the result is m(b)(M(z)) = [3.27 +/- 0.22(stat) +/- 0.22(exp) +/- 0.38(had) +/- 0.16(theo)] GeV/c(2) . The measured ratio is alternatively employed to test the flavour independence of the strong coupling constant for b and light quarks.
2000
A measurement of the b-quark mass from hadronic Z decays / Barate, R., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Merle, E., Minard, M.n., Pietrzyk, B., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., Martinez, M., Merino, G., Miquel, R., Mir, L.m., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 18:1(2000), pp. 1-13. [10.1007/s100520000533]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/5063
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