Date

Subject_areas

Total cross-section in $\gamma \gamma$ collisions at LEP

The L3 collaboration Acciarri, M. ; Achard, P. ; Adriani, O. ; et al.
Phys.Lett. B519 (2001) 33-45, 2001.
Inspire Record 552997 DOI 10.17182/hepdata.49853

The reaction e+e- -> e+e- gamma* gamma* -> e+e- hadrons for quasi-real photons is studied using data from root(s) = 183 GeV up to 202 GeV. Results on the total cross sections sigma(e+e- -> e+e- hadrons) and sigma(+e- gamma* gamma* -> e+e- hadrons) are given for the two-photon centre-of-mass energies 5 GeV < Wgammagamma < 185 GeV. The total cross section of two real photons is described by a Regge parametrisation. We observe a steeper rise with the two-photon centre-of-mass energy as compared to the hadron-hadron and the photon-proton cross sections. The data are also compared to the expectations of different theoretical models.

2 data tables

The measured total cross section for E+ E- --> E+ E- HADRONS. The first DSYS error is the total experimental systematic uncertainty and the second DSYS error is the uncertainty introduced by unfolding the data with PYTHIA and PHOJET corrections seperately.

The total cross section for two photon production of hadrons. The final column gives the data averaged over all energies together with the experimental systematic error (first DSYS) and the difference between the average and the data unfolded with PHOJET (lower sign) and PYTHIA (upper sign) seperately (second DSYS).


Measurement of the photon structure function at high $Q^{2}$ at LEP

The L3 collaboration Acciarri, M. ; Achard, P. ; Adriani, O. ; et al.
Phys.Lett. B483 (2000) 373-386, 2000.
Inspire Record 525764 DOI 10.17182/hepdata.49964

The structure functions of real and virtual photons are derived from cross section measurements of the reaction e^+e^ -> e^+e^- + hadrons at LEP. The reaction is studied at \sqrt{s} ~ 91 GeV with the L3 detector. One of the final state electrons is detected at a large angle relative to the beam direction, leading to Q^2 values between 40 GeV^2 and 500 GeV^2. The other final state electron is either undetected or it is detected at a four-momentum transfer squared P^2 between 1 GeV^2 and 8 GeV^2. These measurements are compared with predictions of the Quark Parton Model and other QCD based models.

4 data tables

Measured values of F2 for the single-tag data as a function of X for the full Q**2 range.

Measured values of F2 for the single-tag data as a function of Q**2 for different X ranges.

The effective F2 measured in double-tag events as a function of X.

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The Q**2 evolution of the hadronic photon structure function F(2)gamma at LEP

The L3 collaboration Acciarri, M. ; Achard, P. ; Adriani, O. ; et al.
Phys.Lett. B447 (1999) 147-156, 1999.
Inspire Record 479052 DOI 10.17182/hepdata.49323
1 data table

Measured values of F2/ALPHA as a function of x. The second systematic error (DSYS) is that due to the model dependence and is the difference between the results obtained with PHOJET and TWOGAM. The full systematic error is the quadrature sum of the two systematic errors.


Total hadronic cross-section of photon-photon interactions at LEP

The OPAL collaboration Abbiendi, G. ; Ackerstaff, K. ; Alexander, G. ; et al.
Eur.Phys.J. C14 (2000) 199-212, 2000.
Inspire Record 502548 DOI 10.17182/hepdata.49107

The total hadronic cross-section sigma_gg(W) for the interaction of real photons, gg->hadrons, is measured for gg centre-of-mass energies 10<W<110 GeV. The cross-section is extracted from a measurement of the process e+e- -> e+e-g*g* -> e+e- hardrons, using a luminosity function for the photon flux together with form factors for extrapolating to real photons (Q^2=0 GeV^2). The data were taken with the OPAL detector at LEP at e+e- centre-of-mass energies 161, 172 and 183 GeV. The cross-section sigma_gg(W) is compared with Regge factorisation and with the energy dependence observed in gp and pp interactions. The data are also compared to models which predict a faster rise of sigma_gg(W) compared to gp and pp interactions due to additional hard gg interactions not present in hadronic collisions.

2 data tables

No description provided.

No description provided.


Study of the hadronic photon structure function F(2)**gamma at LEP

The L3 collaboration Acciarri, M. ; Adriani, O. ; Aguilar-Benitez, M. ; et al.
Phys.Lett. B436 (1998) 403-416, 1998.
Inspire Record 472644 DOI 10.17182/hepdata.49392
3 data tables

No description provided.

No description provided.

No description provided.


Cross-section of hadron production in gamma gamma collisions at LEP

The L3 collaboration Acciarri, M. ; Adriani, O. ; Aguilar-Benitez, M. ; et al.
Phys.Lett. B408 (1997) 450-464, 1997.
Inspire Record 443566 DOI 10.17182/hepdata.47346
2 data tables

No description provided.

No description provided.


A Measurement of the photon structure function F2 (gamma) at Q**2 = 6.8-GeV**2

The AMY collaboration Kojima, T. ; Nozaki, T. ; Abe, K. ; et al.
Phys.Lett. B400 (1997) 395-400, 1997.
Inspire Record 441558 DOI 10.17182/hepdata.28320
1 data table

No description provided.


A Measurement of the photon structure function F2(gamma) at an average Q**2 of 12-GeV**2/c**4

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Z.Phys. C69 (1996) 223-234, 1996.
Inspire Record 396884 DOI 10.17182/hepdata.47867
2 data tables

No description provided.

Low x domain.


A High Q**2 measurement of the photon structure function F2(gamma)

The AMY collaboration Sahu, S.K. ; Ebara, S. ; Nozaki, T. ; et al.
Phys.Lett. B346 (1995) 208-216, 1995.
Inspire Record 392701 DOI 10.17182/hepdata.38361
3 data tables

No description provided.

No description provided.

Errors contain both statistics and systematics.


Measurement of the photon structure function F2(gamma) and jet production at TRISTAN

The TOPAZ collaboration Muramatsu, K. ; Hayashii, H. ; Noguchi, S. ; et al.
Phys.Lett. B332 (1994) 477-487, 1994.
Inspire Record 373856 DOI 10.17182/hepdata.38377
7 data tables

No description provided.

No description provided.

No description provided.

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Observation of scaling of the photon structure function $F_2^\gamma$ at low $Q^2$

The TPC/Two Gamma collaboration Aihara, H. ; Alston-Garnjost, M. ; Avery, R.E. ; et al.
Phys.Rev.Lett. 58 (1987) 97, 1987.
Inspire Record 233595 DOI 10.17182/hepdata.20136
4 data tables

Data read from graph.

Data read from graph.

Data read from graph.

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Measurement and QCD Analysis of the Photon Structure Function F2 (x, Q**2)

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Lackas, W. ; et al.
Nucl.Phys. B281 (1987) 365, 1987.
Inspire Record 230592 DOI 10.17182/hepdata.33588
5 data tables

Data read from graph.

Data read from graph.

Data read from graph.

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Measurement of the photon structure function F2 (gamma) in the reaction e+ e- ---> e+ e- + hadrons at LEP

The OPAL collaboration Akers, R. ; Alexander, G. ; Allison, John ; et al.
Z.Phys. C61 (1994) 199-208, 1994.
Inspire Record 358863 DOI 10.17182/hepdata.48474
2 data tables

Additional overall systematic error 5.9% not included.

Additional overall systematic error 5.9% not included.


A measurement of the total hadronic cross-section in tagged $\gamma\gamma$ reactions

The TPC/Two Gamma collaboration Aihara, H. ; Alston-Garnjost, M. ; Avery, R.E. ; et al.
Phys.Rev. D41 (1990) 2667, 1990.
Inspire Record 281351 DOI 10.17182/hepdata.22991
4 data tables

Errors are statistical only.

Errors are statistical only.

Errors are statistical only.

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Total cross-section of two photon production of hadrons

Baru, S.E. ; Beilin, M.V. ; Blinov, A.E. ; et al.
Z.Phys. C53 (1992) 219-224, 1992.
Inspire Record 33675 DOI 10.17182/hepdata.14767
2 data tables

No description provided.

No description provided.


A Measurement of the photon structure function $F_2$

The AMY collaboration Sasaki, T. ; Yamagishi, Y. ; Tanaka, R. ; et al.
Phys.Lett. B252 (1990) 491-498, 1990.
Inspire Record 299056 DOI 10.17182/hepdata.29524
4 data tables

X dependence at Q**2 = 73 GeV**2 for light quark data.

X dependence at Q**2 = 73 GeV**2 for total data.

Photon structure function F2 for total data.

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THE TPC / 2 gamma EXPERIMENT AT PEP

Bauer, Daniel A. ;
Conference Paper, 1986.
Inspire Record 231357 DOI 10.17182/hepdata.76256
11 data tables

Data read off graph.

Data read off graph.

No description provided.

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Measurement of the Photon Structure Function f(2)Gamma at Q**2 from 7-GeV/c**2 to 70-GeV/c**2

The TASSO collaboration Althoff, M. ; Braunschweig, W. ; Gerhards, R. ; et al.
Z.Phys. C31 (1986) 527, 1986.
Inspire Record 228251 DOI 10.17182/hepdata.15858
1 data table

No description provided.


Experimental Study of the Hadronic Photon Structure Function

The CELLO collaboration Behrend, H.J. ; Fenner, H. ; Gumpel, U. ; et al.
Phys.Lett. B126 (1983) 391-397, 1983.
Inspire Record 198110 DOI 10.17182/hepdata.30720
1 data table

No description provided.


Experimental Study of the Photon Structure Function F(2) in the High $Q^2$ Region

The JADE collaboration Bartel, W. ; Cords, D. ; Dietrich, G. ; et al.
Phys.Lett. B121 (1983) 203-208, 1983.
Inspire Record 180758 DOI 10.17182/hepdata.30781
3 data tables

Data read off graph.

Data read off graph.

Data read off graph.


Measurement of the Photon Structure Function F2 (x, Q**2)

The PLUTO collaboration Berger, Christoph ; Deuter, A. ; Genzel, H. ; et al.
Phys.Lett. B142 (1984) 111-118, 1984.
Inspire Record 201376 DOI 10.17182/hepdata.30545
4 data tables

No description provided.

No description provided.

No description provided.

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Measurement of the Total Hadronic Cross-section in Photon-photon Interactions

The TPC/Two Gamma collaboration Bintinger, D. ; Kees, K.H. ; Masek, G.E. ; et al.
Phys.Rev.Lett. 54 (1985) 763, 1985.
Inspire Record 205658 DOI 10.17182/hepdata.20338
4 data tables

CROSS SECTION EXTRAPOLATED USING THE GENERALISED VECTOR CT. = Data are for >= 3 hadrons. DOMINANCE MODEL TO Q1=Q2=0.

Data are for >= 3 hadrons.

Data are for >= 3 hadrons.

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The $Q^2$ and Transverse Momentum Dependence of Jet Production in Photon-photon Interactions

The PLUTO collaboration Berger, Christoph ; Deuter, A. ; Genzel, H. ; et al.
Z.Phys. C26 (1984) 191, 1984.
Inspire Record 203794 DOI 10.17182/hepdata.16196
1 data table

No description provided.


First Measurement of the Photon Structure Function F2

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Grigull, R. ; et al.
Phys.Lett. B107 (1981) 168-172, 1981.
Inspire Record 167681 DOI 10.17182/hepdata.31043
2 data tables

Data read from graph.. Data for W < 3.5 in Berger et al. 1981, PL 99B,287 (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+1164> RED = 1164 </a>).

PHOTON STRUCTURE FUNCTION. NUMERICAL VALUES OF DATA ON FIGURE SUPPLIED BY W. WAGNER.


INELASTIC ELECTRON PHOTON SCATTERING AT MODERATE FOUR MOMENTUM TRANSFERS

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Grigull, R. ; et al.
Phys.Lett. B99 (1981) 287-291, 1981.
Inspire Record 155594 DOI 10.17182/hepdata.27125
3 data tables

No description provided.

DEPENDENCE ON VISIBLE HADRONIC INVARIANT MASS.

Data read from graph.