Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP

J. Abdallah; Catherine De Clercq; Jorgen D'Hondt; Jacques Lemonne

Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP

J. Abdallah, Catherine De Clercq, Jorgen D'Hondt, Jacques Lemonne

Physics

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

The effect of the heavy b-quarkmass 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, R-n(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 andARIADNE) is done after the hadronisation phase. Using the four-jet observabl R-4(bl), a measurement of the b-quark mass using massive leading-order calculations gives:

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-jet determinations at the M-Z energy scale and with low energy mass measurements evolved to the M-Z scale using QCD renormalisation group equations.

Original language	English
Pages (from-to)	525-538
Number of pages	14
Journal	The European Physical Journal C
Volume	55
Publication status	Published - 1 Jun 2008

Keywords

E(+)E(-); PHYSICS; DECAYS

Cite this

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title = "Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP",

abstract = "The effect of the heavy b-quarkmass 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, R-n(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 andARIADNE) is done after the hadronisation phase. Using the four-jet observabl R-4(bl), a measurement of the b-quark mass using massive leading-order calculations gives: 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-jet determinations at the M-Z energy scale and with low energy mass measurements evolved to the M-Z scale using QCD renormalisation group equations.",

keywords = "E(+)E(-); PHYSICS; DECAYS",

author = "J. Abdallah and {De Clercq}, Catherine and Jorgen D'Hondt and Jacques Lemonne",

year = "2008",

month = jun,

day = "1",

language = "English",

volume = "55",

pages = "525--538",

journal = "The European Physical Journal C",

issn = "1434-6052",

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TY - JOUR

T1 - Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP

AU - Abdallah, J.

AU - De Clercq, Catherine

AU - D'Hondt, Jorgen

AU - Lemonne, Jacques

PY - 2008/6/1

Y1 - 2008/6/1

N2 - The effect of the heavy b-quarkmass 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, R-n(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 andARIADNE) is done after the hadronisation phase. Using the four-jet observabl R-4(bl), a measurement of the b-quark mass using massive leading-order calculations gives: 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-jet determinations at the M-Z energy scale and with low energy mass measurements evolved to the M-Z scale using QCD renormalisation group equations.

AB - The effect of the heavy b-quarkmass 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, R-n(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 andARIADNE) is done after the hadronisation phase. Using the four-jet observabl R-4(bl), a measurement of the b-quark mass using massive leading-order calculations gives: 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-jet determinations at the M-Z energy scale and with low energy mass measurements evolved to the M-Z scale using QCD renormalisation group equations.

KW - E(+)E(-); PHYSICS; DECAYS

M3 - Article

SN - 1434-6052

VL - 55

SP - 525

EP - 538

JO - The European Physical Journal C

JF - The European Physical Journal C

ER -

Study of b-quark mass effects in multijet topologies with the DELPHI detector at LEP

Abstract

Keywords

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