Measurement of Z/gamma* production in Compton scattering of quasi-real photons

G Abbiendi; Georgios Anagnostou; Paul Bell; Ian Bloodworth; David Charlton; Christopher Hawkes; Roger Homer; Predrag Jovanovic; Thomas McMahon; Stephen O'Neale; Miriam Watson; Peter Watkins; Alan Watson; Nigel Watson; John Wilson

doi:10.1007/s100520100875

Measurement of Z/gamma* production in Compton scattering of quasi-real photons

G Abbiendi, Georgios Anagnostou, Paul Bell, Ian Bloodworth, David Charlton, Christopher Hawkes, Roger Homer, Predrag Jovanovic, Thomas McMahon, Stephen O'Neale, Miriam Watson, Peter Watkins, Alan Watson, Nigel Watson, John Wilson

Physics and Astronomy

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Abstract

The process e(+)e(-) --> e(+)e(-)Z/gamma* is studied with the OPAL detector at LEP at a centre of mass energy of roots = 189 GeV. The cross-section times the branching ratio of the Z/gamma* decaying into hadrons is measured within Lorentz invariant kinematic limits to be (1.2 +/- 0.3 +/- 0.1) pb for invariant masses of the hadronic system between 5 GeV and 60 GeV and (0.7 +/- 0.2 +/- 0.1) pb for hadronic masses above 60 GeV. The differential cross-sections of the Mandelstam variables (s) over cap, (t) over cap, and (u) over cap are measured and compared with the predictions from the Monte Carlo generators grc4f and PYTHIA. From this, based on a factorisation ansatz, the total and differential cross-sections for the subprocess egamma --> eZ/gamma* are derived.

Original language	English
Pages (from-to)	1-15
Number of pages	15
Journal	European Physical Journal C
Volume	24
Issue number	1
DOIs	https://doi.org/10.1007/s100520100875
Publication status	Published - 1 May 2002

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http://publish.edpsciences.org/articles/epjc/abs/2002/06/100520001/100520001.html

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title = "Measurement of Z/gamma* production in Compton scattering of quasi-real photons",

abstract = "The process e(+)e(-) --> e(+)e(-)Z/gamma* is studied with the OPAL detector at LEP at a centre of mass energy of roots = 189 GeV. The cross-section times the branching ratio of the Z/gamma* decaying into hadrons is measured within Lorentz invariant kinematic limits to be (1.2 +/- 0.3 +/- 0.1) pb for invariant masses of the hadronic system between 5 GeV and 60 GeV and (0.7 +/- 0.2 +/- 0.1) pb for hadronic masses above 60 GeV. The differential cross-sections of the Mandelstam variables (s) over cap, (t) over cap, and (u) over cap are measured and compared with the predictions from the Monte Carlo generators grc4f and PYTHIA. From this, based on a factorisation ansatz, the total and differential cross-sections for the subprocess egamma --> eZ/gamma* are derived.",

author = "G Abbiendi and Georgios Anagnostou and Paul Bell and Ian Bloodworth and David Charlton and Christopher Hawkes and Roger Homer and Predrag Jovanovic and Thomas McMahon and Stephen O'Neale and Miriam Watson and Peter Watkins and Alan Watson and Nigel Watson and John Wilson",

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language = "English",

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T1 - Measurement of Z/gamma* production in Compton scattering of quasi-real photons

AU - Abbiendi, G

AU - Anagnostou, Georgios

AU - Bell, Paul

AU - Bloodworth, Ian

AU - Charlton, David

AU - Hawkes, Christopher

AU - Homer, Roger

AU - Jovanovic, Predrag

AU - McMahon, Thomas

AU - O'Neale, Stephen

AU - Watson, Miriam

AU - Watkins, Peter

AU - Watson, Alan

AU - Watson, Nigel

AU - Wilson, John

PY - 2002/5/1

Y1 - 2002/5/1

N2 - The process e(+)e(-) --> e(+)e(-)Z/gamma* is studied with the OPAL detector at LEP at a centre of mass energy of roots = 189 GeV. The cross-section times the branching ratio of the Z/gamma* decaying into hadrons is measured within Lorentz invariant kinematic limits to be (1.2 +/- 0.3 +/- 0.1) pb for invariant masses of the hadronic system between 5 GeV and 60 GeV and (0.7 +/- 0.2 +/- 0.1) pb for hadronic masses above 60 GeV. The differential cross-sections of the Mandelstam variables (s) over cap, (t) over cap, and (u) over cap are measured and compared with the predictions from the Monte Carlo generators grc4f and PYTHIA. From this, based on a factorisation ansatz, the total and differential cross-sections for the subprocess egamma --> eZ/gamma* are derived.

AB - The process e(+)e(-) --> e(+)e(-)Z/gamma* is studied with the OPAL detector at LEP at a centre of mass energy of roots = 189 GeV. The cross-section times the branching ratio of the Z/gamma* decaying into hadrons is measured within Lorentz invariant kinematic limits to be (1.2 +/- 0.3 +/- 0.1) pb for invariant masses of the hadronic system between 5 GeV and 60 GeV and (0.7 +/- 0.2 +/- 0.1) pb for hadronic masses above 60 GeV. The differential cross-sections of the Mandelstam variables (s) over cap, (t) over cap, and (u) over cap are measured and compared with the predictions from the Monte Carlo generators grc4f and PYTHIA. From this, based on a factorisation ansatz, the total and differential cross-sections for the subprocess egamma --> eZ/gamma* are derived.

U2 - 10.1007/s100520100875

DO - 10.1007/s100520100875

M3 - Article

VL - 24

SP - 1

EP - 15

JO - European Physical Journal C

JF - European Physical Journal C

IS - 1

ER -

Measurement of Z/gamma* production in Compton scattering of quasi-real photons

Abstract

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