Colour reconnection studies in e+e-→W+W- at √s = 183 GeV

The OPAL Collaboration

doi:10.1016/S0370-2693(99)00309-3

Colour reconnection studies in e⁺e^-→W⁺W^- at √s = 183 GeV

The OPAL Collaboration

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

22 Scopus citations

Abstract

The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of √s ≃ 182.7 GeV in the OPAL detector at LEP. Dependence on the modelling of hadronic W decays is avoided by comparing W⁺W^-→qq̄′qq̄′ events with the non-leptonic component of W⁺W^-→qq̄′ℓv̄_ℓ events. The scaled momentum distribution, its mean value, 〈x_p〉, and that of the charged particle multiplicity, 〈n_ch〉, are measured and found to be consistent in the two channels. The measured differences are: Δ〈n_ch〉 = 〈n_ch^4q〉 - 2〈n_ch^qqℓv〉 = +0.7 ± 0.6 Δ〈x_p〉 = 〈x_p^4q〉 - 〈x_p^qqℓv〉 = (-0.09 ± 0.09 ± 0.05) × 10^-2 In addition, measurements of rapidity and thrust are performed for W+W^-→ qq̄′qq̄′ events. The data are described well by standard QCD models and disfavour one model of colour reconnection within the ARIADNE program. The current implementation of the Ellis-Geiger model of colour reconnection is excluded. At the current level of statistical precision no evidence for colour reconnection effects was found in the observables studied. The predicted effect of colour reconnection on OPAL measurements of M_W is also quantified in the context of models studied.

Original language	English
Pages (from-to)	153-168
Number of pages	16
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	453
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(99)00309-3
State	Published - 1 Jan 1999
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/S0370-2693(99)00309-3

Cite this

@article{d02f4132e85249bb924789396c77d25a,

title = "Colour reconnection studies in e+e-→W+W- at √s = 183 GeV",

abstract = "The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of √s ≃ 182.7 GeV in the OPAL detector at LEP. Dependence on the modelling of hadronic W decays is avoided by comparing W+W-→q{\=q}′q{\=q}′ events with the non-leptonic component of W+W-→q{\=q}′ℓ{\=v}ℓ events. The scaled momentum distribution, its mean value, 〈xp〉, and that of the charged particle multiplicity, 〈nch〉, are measured and found to be consistent in the two channels. The measured differences are: Δ〈nch〉 = 〈nch4q〉 - 2〈nchqqℓv〉 = +0.7 ± 0.6 Δ〈xp〉 = 〈xp4q〉 - 〈xpqqℓv〉 = (-0.09 ± 0.09 ± 0.05) × 10-2 In addition, measurements of rapidity and thrust are performed for W+W-→ q{\=q}′q{\=q}′ events. The data are described well by standard QCD models and disfavour one model of colour reconnection within the ARIADNE program. The current implementation of the Ellis-Geiger model of colour reconnection is excluded. At the current level of statistical precision no evidence for colour reconnection effects was found in the observables studied. The predicted effect of colour reconnection on OPAL measurements of MW is also quantified in the context of models studied.",

author = "{The OPAL Collaboration} and G. Abbiendi and K. Ackerstaff and G. Alexander and J. Allison and N. Altekamp and Anderson, {K. J.} and S. Anderson and S. Arcelli and S. Asai and Ashby, {S. F.} and D. Axen and G. Azuelos and Ball, {A. H.} and E. Barberio and Barlow, {R. J.} and R. Bartoldus and Batley, {J. R.} and S. Baumann and J. Bechtluft and T. Behnke and Bell, {K. W.} and G. Bella and A. Bellerive and S. Bentvelsen and S. Bethke and S. Betts and O. Biebel and A. Biguzzi and Bird, {S. D.} and V. Blobel and Bloodworth, {I. J.} and P. Bock and J. B{\"o}hme and D. Bonacorsi and M. Boutemeur and S. Braibant and P. Bright-Thomas and L. Brigliadori and Brown, {R. M.} and Burckhart, {H. J.} and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and D. Chrisman and C. Ciocca and Clarke, {P. E.L.} and R. Folman",

note = "Funding Information: 7KLV VWXG\ ZDV IXQGHG E\ WKH ILVFDO \HDU¶V SURMHFW IRU WKH XQGHUJUDGXDWH SURJUDP LQ FKHPLFDO engineering (Engineering faculty) and by the Research Unit of Developing Technology and Innovation of Alternative Energy for Industries, Burapha University. The authors would like to acknowledge Mr. Punyapat Korop, and Mr. Nakarin Pingkason for their laboratory helps. Moreover, the authors would like to state their appreciation to Mrs. Warunya Junhom for her support in thermal analysis.",

year = "1999",

month = jan,

day = "1",

doi = "10.1016/S0370-2693(99)00309-3",

language = "English",

volume = "453",

pages = "153--168",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-2",

}

TY - JOUR

T1 - Colour reconnection studies in e+e-→W+W- at √s = 183 GeV

AU - The OPAL Collaboration

AU - Abbiendi, G.

AU - Ackerstaff, K.

AU - Alexander, G.

AU - Allison, J.

AU - Altekamp, N.

AU - Anderson, K. J.

AU - Anderson, S.

AU - Arcelli, S.

AU - Asai, S.

AU - Ashby, S. F.

AU - Axen, D.

AU - Azuelos, G.

AU - Ball, A. H.

AU - Barberio, E.

AU - Barlow, R. J.

AU - Bartoldus, R.

AU - Batley, J. R.

AU - Baumann, S.

AU - Bechtluft, J.

AU - Behnke, T.

AU - Bell, K. W.

AU - Bella, G.

AU - Bellerive, A.

AU - Bentvelsen, S.

AU - Bethke, S.

AU - Betts, S.

AU - Biebel, O.

AU - Biguzzi, A.

AU - Bird, S. D.

AU - Blobel, V.

AU - Bloodworth, I. J.

AU - Bock, P.

AU - Böhme, J.

AU - Bonacorsi, D.

AU - Boutemeur, M.

AU - Braibant, S.

AU - Bright-Thomas, P.

AU - Brigliadori, L.

AU - Brown, R. M.

AU - Burckhart, H. J.

AU - Capiluppi, P.

AU - Carnegie, R. K.

AU - Carter, A. A.

AU - Carter, J. R.

AU - Chang, C. Y.

AU - Charlton, D. G.

AU - Chrisman, D.

AU - Ciocca, C.

AU - Clarke, P. E.L.

AU - Folman, R.

N1 - Funding Information: 7KLV VWXG\ ZDV IXQGHG E\ WKH ILVFDO \HDU¶V SURMHFW IRU WKH XQGHUJUDGXDWH SURJUDP LQ FKHPLFDO engineering (Engineering faculty) and by the Research Unit of Developing Technology and Innovation of Alternative Energy for Industries, Burapha University. The authors would like to acknowledge Mr. Punyapat Korop, and Mr. Nakarin Pingkason for their laboratory helps. Moreover, the authors would like to state their appreciation to Mrs. Warunya Junhom for her support in thermal analysis.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of √s ≃ 182.7 GeV in the OPAL detector at LEP. Dependence on the modelling of hadronic W decays is avoided by comparing W+W-→qq̄′qq̄′ events with the non-leptonic component of W+W-→qq̄′ℓv̄ℓ events. The scaled momentum distribution, its mean value, 〈xp〉, and that of the charged particle multiplicity, 〈nch〉, are measured and found to be consistent in the two channels. The measured differences are: Δ〈nch〉 = 〈nch4q〉 - 2〈nchqqℓv〉 = +0.7 ± 0.6 Δ〈xp〉 = 〈xp4q〉 - 〈xpqqℓv〉 = (-0.09 ± 0.09 ± 0.05) × 10-2 In addition, measurements of rapidity and thrust are performed for W+W-→ qq̄′qq̄′ events. The data are described well by standard QCD models and disfavour one model of colour reconnection within the ARIADNE program. The current implementation of the Ellis-Geiger model of colour reconnection is excluded. At the current level of statistical precision no evidence for colour reconnection effects was found in the observables studied. The predicted effect of colour reconnection on OPAL measurements of MW is also quantified in the context of models studied.

AB - The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of √s ≃ 182.7 GeV in the OPAL detector at LEP. Dependence on the modelling of hadronic W decays is avoided by comparing W+W-→qq̄′qq̄′ events with the non-leptonic component of W+W-→qq̄′ℓv̄ℓ events. The scaled momentum distribution, its mean value, 〈xp〉, and that of the charged particle multiplicity, 〈nch〉, are measured and found to be consistent in the two channels. The measured differences are: Δ〈nch〉 = 〈nch4q〉 - 2〈nchqqℓv〉 = +0.7 ± 0.6 Δ〈xp〉 = 〈xp4q〉 - 〈xpqqℓv〉 = (-0.09 ± 0.09 ± 0.05) × 10-2 In addition, measurements of rapidity and thrust are performed for W+W-→ qq̄′qq̄′ events. The data are described well by standard QCD models and disfavour one model of colour reconnection within the ARIADNE program. The current implementation of the Ellis-Geiger model of colour reconnection is excluded. At the current level of statistical precision no evidence for colour reconnection effects was found in the observables studied. The predicted effect of colour reconnection on OPAL measurements of MW is also quantified in the context of models studied.

UR - http://www.scopus.com/inward/record.url?scp=0040146369&partnerID=8YFLogxK

U2 - 10.1016/S0370-2693(99)00309-3

DO - 10.1016/S0370-2693(99)00309-3

M3 - Article

AN - SCOPUS:0040146369

SN - 0370-2693

VL - 453

SP - 153

EP - 168

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -

Colour reconnection studies in e⁺e^-→W⁺W^- at √s = 183 GeV

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