Charged multiplicities in Z decays into u, d and s quarks

G Abbiendi; Georgios Anagnostou; Ian Bloodworth; Paul Bright-Thomas; David Charlton; Christopher Hawkes; Roger Homer; Martin Jimack; Predrag Jovanovic; Alun Lloyd; Thomas McMahon; Stephen O'Neale; Scott Talbot; Miriam Watson; Peter Watkins; Alan Watson; Nigel Watson; John Wilson

doi:10.1007/s100520100611

Charged multiplicities in Z decays into u, d and s quarks

G Abbiendi, Georgios Anagnostou, Ian Bloodworth, Paul Bright-Thomas, David Charlton, Christopher Hawkes, Roger Homer, Martin Jimack, Predrag Jovanovic, Alun Lloyd, Thomas McMahon, Stephen O'Neale, Scott Talbot, Miriam Watson, Peter Watkins, Alan Watson, Nigel Watson, John Wilson

Physics and Astronomy

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Abstract

About 4.4 million hadronic decays of Z bosons, recorded by the OPAL detector at LEP at a centre-of-mass energy of around roots = 91.2 GeV, are used to determine the mean charged particle multiplicities for the three light quark flavours. Events from primary u, d, and s quarks are tagged by selecting characteristic particles which carry a large fraction of the beam energy. The charged particle multiplicities are measured in the hemispheres opposite to these particles. An unfolding procedure is applied to obtain these multiplicities for each primary light quark flavour. This yields [n(u)] = 17.77 +/- 0.51(-1.20)(+0.86), [n(d)] = 21.44 +/- 0.63(-1.17)(+1.46), [n(s)] = 20.02 +/- 0.13(-0.37)(+0.39), where statistical and systematic errors are given. The results for [n(u)] and [n(d)] are almost fully statistically anti-correlated. Within the errors the result is consistent with the flavour independence of the strong interaction for the particle multiplicities in events from the light up, down, and strange quarks.

Original language	English
Pages (from-to)	257-268
Number of pages	12
Journal	European Physical Journal C
Volume	19
Issue number	2
DOIs	https://doi.org/10.1007/s100520100611
Publication status	Published - 1 Feb 2001

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Abbiendi, G., Anagnostou, G., Bloodworth, I., Bright-Thomas, P., Charlton, D., Hawkes, C., Homer, R., Jimack, M., Jovanovic, P., Lloyd, A., McMahon, T., O'Neale, S., Talbot, S., Watson, M., Watkins, P., Watson, A., Watson, N., & Wilson, J. (2001). Charged multiplicities in Z decays into u, d and s quarks. European Physical Journal C, 19(2), 257-268. https://doi.org/10.1007/s100520100611

@article{26dee25da2e74844a78279ea87fdadee,

title = "Charged multiplicities in Z decays into u, d and s quarks",

abstract = "About 4.4 million hadronic decays of Z bosons, recorded by the OPAL detector at LEP at a centre-of-mass energy of around roots = 91.2 GeV, are used to determine the mean charged particle multiplicities for the three light quark flavours. Events from primary u, d, and s quarks are tagged by selecting characteristic particles which carry a large fraction of the beam energy. The charged particle multiplicities are measured in the hemispheres opposite to these particles. An unfolding procedure is applied to obtain these multiplicities for each primary light quark flavour. This yields [n(u)] = 17.77 +/- 0.51(-1.20)(+0.86), [n(d)] = 21.44 +/- 0.63(-1.17)(+1.46), [n(s)] = 20.02 +/- 0.13(-0.37)(+0.39), where statistical and systematic errors are given. The results for [n(u)] and [n(d)] are almost fully statistically anti-correlated. Within the errors the result is consistent with the flavour independence of the strong interaction for the particle multiplicities in events from the light up, down, and strange quarks.",

author = "G Abbiendi and Georgios Anagnostou and Ian Bloodworth and Paul Bright-Thomas and David Charlton and Christopher Hawkes and Roger Homer and Martin Jimack and Predrag Jovanovic and Alun Lloyd and Thomas McMahon and Stephen O'Neale and Scott Talbot and Miriam Watson and Peter Watkins and Alan Watson and Nigel Watson and John Wilson",

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Abbiendi, G, Anagnostou, G, Bloodworth, I, Bright-Thomas, P, Charlton, D, Hawkes, C, Homer, R, Jimack, M, Jovanovic, P, Lloyd, A, McMahon, T, O'Neale, S, Talbot, S, Watson, M, Watkins, P, Watson, A , Watson, N & Wilson, J 2001, 'Charged multiplicities in Z decays into u, d and s quarks', European Physical Journal C, vol. 19, no. 2, pp. 257-268. https://doi.org/10.1007/s100520100611

TY - JOUR

T1 - Charged multiplicities in Z decays into u, d and s quarks

AU - Abbiendi, G

AU - Anagnostou, Georgios

AU - Bloodworth, Ian

AU - Bright-Thomas, Paul

AU - Charlton, David

AU - Hawkes, Christopher

AU - Homer, Roger

AU - Jimack, Martin

AU - Jovanovic, Predrag

AU - Lloyd, Alun

AU - McMahon, Thomas

AU - O'Neale, Stephen

AU - Talbot, Scott

AU - Watson, Miriam

AU - Watkins, Peter

AU - Watson, Alan

AU - Watson, Nigel

AU - Wilson, John

PY - 2001/2/1

Y1 - 2001/2/1

N2 - About 4.4 million hadronic decays of Z bosons, recorded by the OPAL detector at LEP at a centre-of-mass energy of around roots = 91.2 GeV, are used to determine the mean charged particle multiplicities for the three light quark flavours. Events from primary u, d, and s quarks are tagged by selecting characteristic particles which carry a large fraction of the beam energy. The charged particle multiplicities are measured in the hemispheres opposite to these particles. An unfolding procedure is applied to obtain these multiplicities for each primary light quark flavour. This yields [n(u)] = 17.77 +/- 0.51(-1.20)(+0.86), [n(d)] = 21.44 +/- 0.63(-1.17)(+1.46), [n(s)] = 20.02 +/- 0.13(-0.37)(+0.39), where statistical and systematic errors are given. The results for [n(u)] and [n(d)] are almost fully statistically anti-correlated. Within the errors the result is consistent with the flavour independence of the strong interaction for the particle multiplicities in events from the light up, down, and strange quarks.

AB - About 4.4 million hadronic decays of Z bosons, recorded by the OPAL detector at LEP at a centre-of-mass energy of around roots = 91.2 GeV, are used to determine the mean charged particle multiplicities for the three light quark flavours. Events from primary u, d, and s quarks are tagged by selecting characteristic particles which carry a large fraction of the beam energy. The charged particle multiplicities are measured in the hemispheres opposite to these particles. An unfolding procedure is applied to obtain these multiplicities for each primary light quark flavour. This yields [n(u)] = 17.77 +/- 0.51(-1.20)(+0.86), [n(d)] = 21.44 +/- 0.63(-1.17)(+1.46), [n(s)] = 20.02 +/- 0.13(-0.37)(+0.39), where statistical and systematic errors are given. The results for [n(u)] and [n(d)] are almost fully statistically anti-correlated. Within the errors the result is consistent with the flavour independence of the strong interaction for the particle multiplicities in events from the light up, down, and strange quarks.

U2 - 10.1007/s100520100611

DO - 10.1007/s100520100611

M3 - Article

SN - 1434-6044

VL - 19

SP - 257

EP - 268

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

ER -

Charged multiplicities in Z decays into u, d and s quarks

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