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A DETERMINATION OF THE TOTAL PHOTONUCLEAR ABSORPTION CROSS-SECTION FOR PB IN THE DELTA RESONANCE REGION BY MEANS OF A NEUTRON MULTIPLICITY MEASUREMENT

Chollet, J.C. ; Arends, J. ; Beil, H. ; et al.

Phys.Lett.B 127 (1983) 331-335, 1983.

Inspire Record 194980 DOI 10.17182/hepdata.30716

Multiple-neutron events ( γ , i n…) for Pb have been recorded according to their neutron multiplicity i , for i ⩾ 1 with a quasi-monoenergetic photon beam obtained by the annihilation in flight of monochromatic positrons. These experimental results, taken with photon energies E γ from 145 up to 440 MeV, are subsequently used to determine the partial sum σ (2) ( E γ )= Σ i ⩾2 σ ( γ , i n…) and to evaluate the ensuing total photonuclear absorption cross section σ (tot: Eγ ).

4 data tables

Table 1

DATA FROM ARENDS ET AL., PL 98B/ 423/81 AND ROST (DISSERTATION) BONN IR-80-10 (1980).

Table 2

DATA FROM ARENS ET AL. PHOTOPION NUCLEAR PHYSICS, ED. P. STOLER (PLENUM NEW YORK, 1969) P. 385.

Table 3

DATA FROM LEPRETRE ET AL., NP A367/237/81 AND CARLOS ET AL., NP A378/317/82 FOR E<140 MEV AND THIS EXPERIMENT FOR E>140 MEV.

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D*+- Production by e+ e- Annihilation Near 34.4-GeV Center-Of-Mass Energy

The TASSO collaboration Althoff, M. ; Braunschweig, W. ; Gather, K. ; et al.

Phys.Lett.B 126 (1983) 493-498, 1983.

Inspire Record 196842 DOI 10.17182/hepdata.30721

D ∗± production via e + e − →D ∗± X has been measured at an average CM energy of 34.4 GeV. The D ∗± energy spectrum is hard, with a maximum near χ = 0.6. The size of the D ∗ cross section, R D ∗ = σ( e + e − → D ∗ X ) σ μμ = 2.50 ± 0.64 ± 0.88 (assuming R D ∗0 = R D ∗+ ) indicates that a large fraction of charm quark production yields D ∗ mesons. The D ∗± angular distribution exhibits a forward—backward asymmetry, A = −0.28 ± 0.13. This is consistent with that expected in the standard theory for weak neutral currents and leads to | g A c | = 0.89 ± 0.44 for the axial vector coupling of the charm quark.

3 data tables

Table 1

ASSUMES EQUAL RATES FOR CHARGED AND NEUTRAL D*'S. ONLY CHARGED ARE DETECTED.

Table 2

DATA PEAKS AT X=0.6 TO 0.8.

Table 3

ASYMMETRY MEASUREMENT. THETA IS THE ANGLE BETWEEN THE E- AND THE D*.

The Ratio of the Nucleon Structure Functions f2 (n) for Iron and Deuterium

The European Muon collaboration Aubert, J.J. ; Bassompierre, G. ; Becks, K.H. ; et al.

Phys.Lett.B 123 (1983) 275-278, 1983.

Inspire Record 188925 DOI 10.17182/hepdata.30745

Using the data on deep inelastic muon scattering on iron and deuterium the ratio of the nucleon structure functions F 2 N ( Fe )/ F 2 N ( D ) is presented. The observed x -dependence of this ratio is in disagreement with existing theoretical predictions.

1 data table

Table 1

RANGE OF Q*2 VARIES WITH X. E.G. AT X=0.05 , 9<Q2<27. AT X=0.65 , 36<Q2<170 GEV**2.

Observation of Jets in High Transverse Energy Events at the CERN Proton - anti-Proton Collider

The UA1 collaboration Arnison, G. ; Astbury, A. ; Aubert, Bernard ; et al.

Phys.Lett.B 123 (1983) 115-122, 1983.

Inspire Record 188735 DOI 10.17182/hepdata.30754

With a segmented total absorption calorimeter of large acceptance, we have measured the total transverse energy spectrum for pp̄ collisions at s 1 2 = 540 GeV up to ΣE T = 130 GeV in the pseudo-rapidity range | η |< 1.5. Using two different algorithms, we have looked for localized depositions of transverse energy (jets). For ΣE T > 40 GeV , the fraction of events with two jets increases with Σ E T ; this event structure is dominant for ΣE T > 100 GeV. We measure the inclusive jet cross section up to E T (jet) = 60 GeV and the two-jets mass distribution to 120 GeV/ c 2 . The measured cross sections are compatible with the predictions of hard scattering models based on QCD.

2 data tables

Table 1

DATA TAKEN IN 1981 WITH GLOBAL TRANSVERSE ENERGY TRIGGER.

Table 2

DATA TAKEN IN 1982 WITH LOCAL TRANSVERSE ENERGY TRIGGER.

Inclusive Charged Particle Production at the CERN anti-p p Collider

The UA2 collaboration Banner, M. ; Bloch, P. ; Bonaudi, F. ; et al.

Phys.Lett.B 122 (1983) 322-328, 1983.

Inspire Record 190969 DOI 10.17182/hepdata.30782

Transverse momentum distributions of pions, kaons and protons have been measured around 90° in the UA2 detector at the SPS p p collider, at a CM energy of 540 GeV. All the cross sections have increased by more than a factor of 2 over those measured at ISR energies and exhibit a flatter behaviour with respect to transverse momentum.

1 data table

Table 1

No description provided.

MEASUREMENT OF THE DEUTERON STRUCTURE FUNCTION F2 AND A COMPARISON OF PROTON AND NEUTRON STRUCTURE

The European Muon collaboration Aubert, J.J. ; Bassompierre, G. ; Becks, K.H. ; et al.

Phys.Lett.B 123 (1983) 123-126, 1983.

Inspire Record 188737 DOI 10.17182/hepdata.30753

The deuteron structure function F 2 d has been measured in 280 GeV μ + d interactions. Existing measurements of F 2 p , made with the same apparatus, are used to calculate F 2 p − F 2 n and F 2 n F 2 p . The ratio F 2 n F 2 p has a similar x dependence to that of earlier measurements at lower Q 2 .

10 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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DIFFRACTIVE K0 LAMBDA0 PRODUCTION BY NEUTRONS WITH 40-GeV/c MEAN MOMENTUM

The BIS-2 collaboration Aleev, A.N. ; Arefev, V.A. ; Balandin, V.P. ; et al.

PHE 83-1, 1983.

Inspire Record 190017 DOI 10.17182/hepdata.31222

None

1 data table

Table 1

No description provided.

AVERAGE NUMBER OF NEUTRONS ON PI- P, PI- N AND PI- C-12 INTERACTION AT P = 4-GEV/

Bekmirzaev, R.N. ; Grishin, V.G. ; Muminov, M.M. ; et al.

Sov.J.Nucl.Phys. 39 (1984) 764, 1984.

Inspire Record 194988 DOI 10.17182/hepdata.39015

None

2 data tables

Table 1

Axis error includes +- 6/6 contribution (THE NUMBER OF NEUTRAL STARS WAS CORRECTED FOR ACCIDENTAL STARS WITHOUT FORMER INTERACTIONS AND FOR STARS PRODUCED BY KL MESONS, THE LAMBDA AND KS PARTICLES YIELD BEING NEGLECTEDTHE MOMENTUM OF NEUTRON IN THE STAR WAS TAKEN OF ONE AND A HALF OF TOTAL MOMENTUM OF CHARGED PARTICLES IN THE STAR).

Table 2

No description provided.