Date

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Charged and identified particles in the hadronic decay of W bosons and in e+ e- ---> q anti-q from 130-GeV to 200-GeV

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Eur.Phys.J. C18 (2000) 203-228, 2000.
Inspire Record 526164 DOI 10.17182/hepdata.43294

Inclusive distributions of charged particles in hadronic W decays are experimentally investigated using the statistics collected by the DELPHI experiment at LEP during 1997, 1998 and 1999, at centre-of-mass energies from 183 to around 200 GeV. The possible effects of interconnection between the hadronic decays of two Ws are not observed. Measurements of the average multiplicity for charged and identified particles in q qbar and WW events at centre-of-mass energies from 130 to 200 GeV and in W decays are presented. The results on the average multiplicity of identified particles and on the position xi^* of the maximum of the xi_p = -log(2p/sqrt(s)) distribution are compared with predictions of JETSET and MLLA calculations.

16 data tables

Corrected multiplicites and dispersions of charged particles produced in hadronic decays from QQBAR events. The 200 GeV results are a weighted average fromthe 192, 196 and 200 GeV data.

Average multiplicities of identified hadrons produced in hadronic decays from QQBAR events.

Corrected multiplicites and dispersions of charged particles produced in fully hadronic W decays from two W 4Q and 2Q events.

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Measurement of the longitudinal and transverse cross-section in e+ e- annihilation at s**(1/2) = 35-GeV - 44-GeV

The JADE collaboration Blumenstengel, M. ; Biebel, O. ; Movilla Fernandez, P.A. ; et al.
Phys.Lett. B517 (2001) 37-46, 2001.
Inspire Record 558568 DOI 10.17182/hepdata.37882
3 data tables

The distribution oF Q*COS(THETA) where Q is the charge of the individual hadron and THETA is the polar angle between the direction of the incoming E- beam and the outgoing hadron. The data are corrected for detector effects.

Value of the longitudinal cross section relative to the total cross section.

Value of the strong coupling constant ALPHAS deduced from the measurements. The second DSYS error is the uncertainty on the renormalisation scale.


QCD results from studies of hadronic events produced in e+ e- annihilations at S**(1/2) = 183-GeV

The L3 collaboration Acciarri, M. ; Adriani, O. ; Aguilar-Benitez, M. ; et al.
Phys.Lett. B444 (1998) 569-582, 1998.
Inspire Record 477808 DOI 10.17182/hepdata.49364
1 data table

These data are superceded by the analysis presented in Acciarri et al PL B489,65.


QCD studies in $e^{+} e^{-}$ annihilation from 30-GeV to 189-GeV

The L3 collaboration Acciarri, M. ; Achard, P. ; Adriani, O. ; et al.
Phys.Lett. B489 (2000) 65-80, 2000.
Inspire Record 527988 DOI 10.17182/hepdata.21126

We present results obtained from a study of the structure of hadronic events recorded by the L3 detector at various centre-of-mass energies. The distributions of event shape variables and the energy dependence of their mean values are measured from 30GeV to 189GeV and compared with various QCD models. The energy dependence of the moments of event shape variables is used to test a power law ansatz for the non-perturbative component. We obtain a universal value of the non-perturbative parameter alpha_0 = 0.537 +/- 0.073. From a comparison with resummed O(alpha_s^2) QCD calculations, we determine the strong coupling constant at each of the selected energies. The measurements demonstrate the running of alpha_s as expected in QCD with a value of alpha_s(m_Z) = 0.1215 +/- 0.0012 (exp) +/- 0.0061 (th).

22 data tables

Distribution for THRUST at c.m. energy 189 GeV.

Distribution for Heavy Jet Mass at c.m. energy 189 GeV.

Distribution for Total Jet Broadening at c.m. energy 189 GeV.

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Tests of the standard model and constraints on new physics from measurements of fermion pair production at 189-GeV at LEP

The OPAL collaboration Abbiendi, G. ; Ackerstaff, K. ; Alexander, G. ; et al.
Eur.Phys.J. C13 (2000) 553-572, 2000.
Inspire Record 504989 DOI 10.17182/hepdata.49123

Cross-sections and angular distributions for hadronic and lepton pair final states in e+e- collisions at a centre-of-mass energy near 189 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. The results are used to measure the energy dependence of the electromagnetic coupling constant alpha_em, and to place limits on new physics as described by four-fermion contact interactions or by the exchange of a new heavy particle such as a sneutrino in supersymmetric theories with R-parity violation. A search for the indirect effects of the gravitational interaction in extra dimensions on the mu+mu- and tau+tau- final states is also presented.

9 data tables

Hadronic cross section.

The cross sections for hadronic, and muon- and tau-pair production in the two sprime/s regions.

The cross sections for electron -pair production with various angular cuts.

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Investigation of the splitting of quark and gluon jets

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Eur.Phys.J. C4 (1998) 1-17, 1998.
Inspire Record 467927 DOI 10.17182/hepdata.49547
14 data tables

Scaled energy distribution of charged hadrons produced in Quark jets in 'Y'topology 3-JET events.

Scaled energy distribution of charged hadrons produced in Gluon jets in 'Y'topology 3-JET events.

Scaled energy distribution of charged hadrons produced in Quark jets in 'Mercedes' topology 3-JET events.

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Tests of the standard model and constraints on new physics from measurements of fermion pair production at 183-GeV at LEP

The OPAL collaboration Abbiendi, G. ; Ackerstaff, K. ; Alexander, G. ; et al.
Eur.Phys.J. C6 (1999) 1-18, 1999.
Inspire Record 473699 DOI 10.17182/hepdata.49337

Cross-sections for hadronic, b-bbar and lepton pair final states in e+e- collisions at sqrt(s) = 183 GeV, measured with the OPAL detector at LEP, are presented and compared with the predictions of the Standard Model. Forward-backward asymmetries for the leptonic final states have also been measured. Cross-sections and asymmetries are also presented for data recorded in 1997 at sqrt(s) = 130 and 136 GeV. The results are used to measure the energy dependence of the electromagnetic coupling constant alpha_em, and to place limits on new physics as described by four-fermion contact interactions or by the exchange of a new heavy particle such as a leptoquark, or of a squark or sneutrino in supersymmetric theories with R-parity violation.

21 data tables

No description provided.

The contribution of interference between initial- and final-state radiationhas been removed.

The contribution of interference between initial- and final-state radiationhas been removed.

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QCD studies and determination of alpha-s in e+ e- collisions at s**(1/2) = 161-GeV and 172-GeV

The L3 collaboration Acciarri, M. ; Adriani, O. ; Aguilar-Benitez, M. ; et al.
Phys.Lett. B404 (1997) 390-402, 1997.
Inspire Record 443563 DOI 10.17182/hepdata.47483
8 data tables

No description provided.

Average jet multiplicity using JADE algorithm.

Average jet multiplicity using Durham algorithm.

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Measurement of the multiplicity of gluons splitting to bottom quark pairs in hadronic Z0 decays

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Phys.Lett. B405 (1997) 202-214, 1997.
Inspire Record 442880 DOI 10.17182/hepdata.47486
1 data table

No description provided.


Measurement of the longitudinal, transverse and asymmetry fragmentation functions at LEP

The OPAL collaboration Akers, R. ; Alexander, G. ; Allison, John ; et al.
Z.Phys. C68 (1995) 203-214, 1995.
Inspire Record 395450 DOI 10.17182/hepdata.48040
4 data tables

Transverse component of the fragmentation function.

Longitudinal component of the fragmentation function.

Asymmetry component of the fragmentation function.

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Measurement of inclusive production of light meson resonances in hadronic decays of the Z0

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Phys.Lett. B298 (1993) 236-246, 1993.
Inspire Record 342800 DOI 10.17182/hepdata.29001
10 data tables

Average multiplicity per hadronic event. Extrapolation to x = 0 using the x shape predicted by JETSET 7.3 PS.

Average multiplicity per hadronic event. Extrapolation to x = 0 using the x shape predicted by JETSET 7.3 PS.

Average multiplicity per hadronic event. Extrapolation to x = 0 using the x shape predicted by JETSET 7.3 PS.

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A Measurement of the forward - backward charge asymmetry in hadronic decays of the Z0

The OPAL collaboration Acton, P.D. ; Alexander, G. ; Allison, J. ; et al.
Phys.Lett. B294 (1992) 436-450, 1992.
Inspire Record 336774 DOI 10.17182/hepdata.29004
3 data tables

No description provided.

The second systematic error is due to the uncertainty in the correction for B.BBAR mixing which had been applied to the data.

The second systematic error is due to the uncertainty in the correction for B.BBAR mixing which had been applied to the data.


Measurements of $\alpha^- s$ in $e^+ e^-$ Annihilation at $\sqrt{s}=53$.3-{GeV} and 59.5-{GeV}

The TOPAZ collaboration Adachi, I. ; Aihara, H. ; Doser, M. ; et al.
Phys.Lett. B227 (1989) 495-500, 1989.
Inspire Record 279575 DOI 10.17182/hepdata.29800
2 data tables

No description provided.

No description provided.


Tests of models for parton fragmentation using three jet events in $e^+e^-$ annihiliation at $\sqrt{s} = 29$ GeV

The TPC/Two Gamma collaboration Aihara, H. ; Alston-Garnjost, M. ; Bakken, J.A. ; et al.
Phys.Rev.Lett. 54 (1985) 270, 1985.
Inspire Record 205871 DOI 10.17182/hepdata.20358
1 data table

No description provided.