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Total Hadronic Cross-section From $e^+ e^-$ Annihilation in the Total Center-of-mass Energy Range 1920-{MeV} - 3090-{MeV}

Bacci, C. ; Baldini-Celio, R. ; Capon, G. ; et al.
Lett.Nuovo Cim. 24 (1979) 324, 1979.
Inspire Record 133588 DOI 10.17182/hepdata.37911
1 data table

THE TOTAL CROSS SECTION HAS BEEN CALCULATED FROM R.


A Measurement of the QCD color factors using event shape distributions at s**(1/2) = 14-GeV to 189-GeV

Kluth, S. ; Movilla Fernandez, P.A. ; Bethke, S. ; et al.
Eur.Phys.J. C21 (2001) 199-210, 2001.
Inspire Record 539001 DOI 10.17182/hepdata.43262

Measurements of the QCD colour factors C_A and C_F and of the number of active quark flavours n_f in the process e+e- -> hadrons at high energy are presented. They are based on fits of O(alpha_S**2)+NLLA QCD calculations to distributions of the event shape observables 1-T, C, B_T and B_W measured at centre-of-mass energies from 14 GeV to 189 GeV. Hadronisation effects are approximated with power correction calculations which also depend on the QCD gauge structure. In this approach potential biases from hadronisation models are reduced. Our results for individually measured quantities are n_f = 5.64 +- 1.35, C_A = 2.88 +- 0.27 and C_F = 1.45 +- 0.27 in good agreement with QCD based on the SU(3) symmetry group where n_f=5 for the energies considered here, C_A=3 and C_F=4/3. From simultaneous fits of C_A and C_F we find C_A = 2.84 +- 0.24 and C_F = 1.29 +- 0.18, which is also in good agreement with the QCD expectation.

1 data table

CA, CF, are the color factors for SU(N) group. NF is the number of the active flavors.


A Measurement of J / psi decay widths

The BES collaboration Bai, J.Z. ; Chen, G.P. ; Chen, H.F. ; et al.
Phys.Lett. B355 (1995) 374-380, 1995.
Inspire Record 39870 DOI 10.17182/hepdata.28500
1 data table

No description provided.


E+ e- Physics with the JADE Detector at PETRA

Naroska, B. ;
Phys.Rept. 148 (1987) 67, 1987.
Inspire Record 234905 DOI 10.17182/hepdata.45203
1 data table

Errors are statistical plus point-to-point systematics.


Improved measurements of cross-sections and asymmetries at the Z0 resonance

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Nucl.Phys. B418 (1994) 403-427, 1994.
Inspire Record 373114 DOI 10.17182/hepdata.48349
10 data tables

No description provided.

First result corresponds to the total cross section (i.e. S+T channel), while second one corresponds to S-channel only. An acollinearity less that 10 deg.

Forward-backward asymmetry within the polar angular range 44 < THETA < 136 degrees and acollinearity < 10 degrees.. First result corresponds to the total cross section (i.e. S+T channel), while second one corresponds to S-channel only.

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Review of $e^+ e^-$ Experiments With Pluto From 3-{GeV} to 31-{GeV}

Criegee, Lutz ; Knies, Gerhard ;
Phys.Rept. 83 (1982) 151-280, 1982.
Inspire Record 166799 DOI 10.17182/hepdata.19326
2 data tables

SUMMARY OF MEASUREMENTS OF R (REVISED FROM EARLIER PUBLICATIONS). RADIATIVE CORRECTIONS APPLIED. TAU HEAVY LEPTON CONTRIBUTION SUBTRACTED.

Summary of measurements of the cross section around the UPSI(1S) (revised from earlier publication Phys.Lett. 76B (1978) 243) with radiative corrections a pplied and leptons contribution subtracted. Data extracted from graph by VVE.


Measurement of alpha(s) using NLLA + O (alpha-s**2) in e+ e- annihilation at s**(1/2) = 58-GeV

The AMY collaboration Kim, D.Y. ; Kang, J.S. ; Myung, S.S. ; et al.
Phys.Lett. B420 (1998) 233-240, 1998.
Inspire Record 455114 DOI 10.17182/hepdata.28221
1 data table

No description provided.


A Measurement of R(b) using a double tagging method

The OPAL collaboration Abbiendi, G. ; Ackerstaff, K. ; Alexander, G. ; et al.
Eur.Phys.J. C8 (1999) 217-239, 1999.
Inspire Record 476786 DOI 10.17182/hepdata.49348

The fraction of Z to bbbar events in hadronic Z decays has been measured by the OPAL experiment using the data collected at LEP between 1992 and 1995. The Z to bbbar decays were tagged using displaced secondary vertices, and high momentum electrons and muons. Systematic uncertainties were reduced by measuring the b-tagging efficiency using a double tagging technique. Efficiency correlations between opposite hemispheres of an event are small, and are well understood through comparisons between real and simulated data samples. A value of Rb = 0.2178 +- 0.0011 +- 0.0013 was obtained, where the first error is statistical and the second systematic. The uncertainty on Rc, the fraction of Z to ccbar events in hadronic Z decays, is not included in the errors. The dependence on Rc is Delta(Rb)/Rb = -0.056*Delta(Rc)/Rc where Delta(Rc) is the deviation of Rc from the value 0.172 predicted by the Standard Model. The result for Rb agrees with the value of 0.2155 +- 0.0003 predicted by the Standard Model.

1 data table

Second systematic error depends on Rc=Delta(R_c)/R_c ratio, where Delta(R_c) is the deviation of R_c from the value 0.172 predicted by the Standard Model.


Measurement of the total e+ e- ---> hadrons cross-section near the e+ e- ---> N anti-N threshold

The FENICE collaboration Antonelli, A. ; Baldini, R. ; Bertani, M. ; et al.
Phys.Lett. B365 (1996) 427-430, 1996.
Inspire Record 426675 DOI 10.17182/hepdata.37900
1 data table

Only statistical errors are quoted.


Measurements of alpha-s in e+ e- annihilation at TRISTAN

The TOPAZ collaboration Ohnishi, Y. ; Adachi, I. ; Fujimoto, J. ; et al.
Phys.Lett. B313 (1993) 475-482, 1993.
Inspire Record 361661 DOI 10.17182/hepdata.43784
4 data tables

No description provided.

No description provided.

The exact definition for Y23 see text.

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Measurement of alpha-s from the moment of particle momenta within jets from e+ e- annihilation

The AMY collaboration Lee, K.B. ; Sagawa, H. ; Chung, Y.S. ; et al.
Phys.Lett. B313 (1993) 469-474, 1993.
Inspire Record 356468 DOI 10.17182/hepdata.51361
1 data table

No description provided.


An Improved measurement of R($b$) using a double tagging method

The OPAL collaboration Ackerstaff, K. ; Alexander, G. ; Allison, John ; et al.
Z.Phys. C74 (1997) 1-17, 1997.
Inspire Record 427104 DOI 10.17182/hepdata.47645
1 data table

No description provided.


First measurement of f2-prime (1525) production in Z0 hadronic decays

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Phys.Lett. B379 (1996) 309-318, 1996.
Inspire Record 416741 DOI 10.17182/hepdata.47972
2 data tables

SIG in (1/SIG) is the total hadronic cross section.

No description provided.


Precise measurement of the left-right cross-section asymmetry in Z boson production by e+ e- collisions

The SLD collaboration Schumm, B.A. ;
Nucl.Phys.Proc.Suppl. 40 (1995) 497-503, 1995.
Inspire Record 389176 DOI 10.17182/hepdata.31853
1 data table

R and L refer to Right and Left handed electron beam polarization. ASYM is defined as follows : ASYM = ((SIG(C=L)-SIG(C=R))/(SIG(C=L)+SIG(C=R)).


Measurement of R($b$) at SLD

The SLD collaboration Etzion, Erez ;
Conference Paper, 2016.
Inspire Record 419721 DOI 10.17182/hepdata.18611

We report a new measurement of Rb=Gamma(Z -> bb)/ Gamma(Z -> hadrons) using a double tag technique where the b selection is based on topological reconstruction of the mass of the B-decay vertex. The measurement was performed using a sample of 150k hadronic Z0 events collected with the SLD at the SLAC Linear Collider during the years 1993-1995. The method utilizes the 3-D vertexing abilities of the SLD CCD pixel vertex detector and the small stable SLC beams to obtain a high b tagging efficiency of 37% for a purity of 97.2%. The high purity reduces the systematics introduced by charm contamination and correlations with Rc. We obtain a result of Rb=0.2176+/-0.0033(stat.)+/-0.0017(syst.)+/-0.0008(Rc). (Presented at the XXXIst Rencontres de Moriond Electroweak Interactions and Unified Theories, Les Arcs, Savoie, France, March 16-23, 1996.)

1 data table

No description provided.


Search for a narrow resonance in e+ e- collisions between E(cm) = 58-GeV and 60-GeV

The TOPAZ collaboration Abe, K. ; Adachi, I. ; Awa, S. ; et al.
Phys.Lett. B304 (1993) 373-380, 1993.
Inspire Record 353845 DOI 10.17182/hepdata.28918
4 data tables

No description provided.

No description provided.

No description provided.

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Production characteristics of K0 and light meson resonances in hadronic decays of the Z0

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Z.Phys. C65 (1995) 587-602, 1995.
Inspire Record 377487 DOI 10.17182/hepdata.48348
13 data tables

Average multiplicity per hadronic event. Extrapolation to the full X range using the X-shape predicted by JETSET 7.4 PS model.

Average multiplicity per hadronic event. Extrapolation to the full X range using the X-shape predicted by JETSET 7.4 PS model.

Average multiplicity per hadronic event. Extrapolation to the full X range using the X-shape predicted by JETSET 7.4 PS model.

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Measurement of the $Z^0$ line shape parameters and the electroweak couplings of charged leptons

The OPAL collaboration Alexander, G. ; Allison, John ; Allport, P.P. ; et al.
Z.Phys. C52 (1991) 175-208, 1991.
Inspire Record 315269 DOI 10.17182/hepdata.14859
11 data tables

DATA FROM 1989 RUN. The cross section are quoted with their statistical and point-to-point systematic uncertainty of both the multihadron acceptance and the luminosity calculation.

DATA FROM 1990 RUN. The cross section are quoted with their statistical and point-to-point systematic uncertainty of both the multihadron acceptance and the luminosity calculation.

Cross sections corrected for the effects of efficiency and kinematic cuts and background. Data from 1989 run, reanalysed.

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MEASUREMENT OF alpha-s FROM HADRON JETS IN e+ e- ANNIHILATION AT S**(1/2) OF 29-GeV

Ford, William T. ; Qi, N. ; Read, Alexander L. ; et al.
Phys.Rev. D40 (1989) 1385, 1989.
Inspire Record 276788 DOI 10.17182/hepdata.23112

A study of the lateral development of jets of hadrons produced in electron-positron annihilation has been used to determine the strong coupling constant αs. Data were obtained with the MAC detector at the SLAC e+e− storage ring PEP at s=29 GeV. Based on the parton calculations of Gottschalk and Shatz, a value for αs of 0.133±0.005(stat)±0.009(syst) has been determined for string fragmentation, and 0.112±0.008(stat)±0.007(syst) for an independent-jet model.

2 data tables

JET FRACTION MEASURED. FIT ACCORDING TO:. T.D. GOTTSCHALK AND M.P.SCHATZ CALT-68-1172 (1985).

JET FRACTION MEASURED. FIT ACCORDING TO INDEPENTENT JET MODEL.


Determination of $\alpha^- s$ From a Differential Jet Multiplicity Distribution at {SLC} and {PEP}

Komamiya, Sachio ; Le Diberder, F. ; Abrams, G.S. ; et al.
Phys.Rev.Lett. 64 (1990) 987, 1990.
Inspire Record 283630 DOI 10.17182/hepdata.19937
2 data tables

DIFFERENTIAL JET MULTIPLICITIES.

DIFFERENTIAL JET MULTIPLICITIES.


Observation of a Narrow Resonance at 10.02-GeV in e+ e- Annihilations

Bienlein, J.K. ; Horber, E. ; Leissner, M. ; et al.
Phys.Lett. B78 (1978) 360-363, 1978.
Inspire Record 131524 DOI 10.17182/hepdata.45244
2 data tables

The data renormalized to the expected level of continuum based on the ratioof R=sigma(hadrons)/sigma(mu+mu-) = 4.7 at sqrt(s) = 5 GeV.

The data renormalized to the expected level of continuum based on the ratioof R=sigma(hadrons)/sigma(mu+mu-) = 4.7 at sqrt(s) = 5 GeV.