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The Reaction $\gamma p \to p \pi^+ \pi^- \pi^+ \pi^-$ for Photon Energies From 25-{GeV} to 70-{GeV}

The Bonn-CERN-Ecole Poly-Glasgow-Lancaster-Manchester-Orsay-Paris-Rutherford-Sheffield collaboration Aston, D. ; Atkinson, M. ; Bailey, R. ; et al.
Nucl.Phys.B 189 (1981) 15-39, 1981.
Inspire Record 164533 DOI 10.17182/hepdata.34258

Measurements of the reaction γ p → p π + π − π + π − are presented, in which π + π − π + π − systems with masses up to 3 GeV are produced from fragmentation of the incident photon. The reaction is dominated by production of the large peak of the ϱ′(1600) meson and, at higher masses ≳2 GeV, y production of jet-like 4 π systems. The ϱ′(1600) meson is produced by a predominantly s -channel helicity conserving mechanism. At higher masses there are also indications of ϱπ peaks, of masses 1.3 GeV (the A 2 meson) and 1.75 GeV, produced with a recoiling π meson by a mechanism consistent with the Deck effect.

1 data table
Table 1

CORRECTED FOR TAILS OF BREIT-WIGNER RESONANCE USED IN FIT AND ALLOWING FOR 10 PCT BACKGROUND.


Spectra of Cumulative Protons in the $\gamma ^{12}$C $\to P X$ Process at $\gamma$ Quanta Maximum Energy 4.5-{GeV}

Alanakian, K.V. ; Amarian, M.D. ; Demirchyan, R.A. ; et al.
Sov.J.Nucl.Phys. 34 (1981) 828, 1981.
Inspire Record 167331 DOI 10.17182/hepdata.17788

None

1 data table
Table 1

No description provided.


Multiplicity of Secondary Particles in Inelastic Proton - Neon Interactions at 300-{GeV}/$c$

Azimov, S.A. ; Inogamov, Sh.V. ; Kosonovsky, E.A. ; et al.
Phys.Rev.D 23 (1981) 2512, 1981.
Inspire Record 10318 DOI 10.17182/hepdata.17871

The data on the total inelastic and partial cross sections in pNe interactions at 300 GeV are presented. It is found that the total cross section, σin(pNe)=356±13 mb, and multiplicity distributions of the number of negative and relativistic charged particles are in good agreement with predictions of a multiple-scattering model based on Glauber's approach. The multiplicity of negative particles obeys the Koba-Nielsen-Olesen (KNO) scaling, but it is observed that the KNO function depends on the atomic mass number of the target. From an analysis of the average multiplicities of secondary particles, it is shown that approximately 10 percent of the fast (p≳1.2 GeV) positive secondaries are protons, which are derived from the nucleons in the neon nucleus.

13 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of $D^*$ Production in Pion - Nucleon Interactions at 200-{GeV}/$c$

Fitch, V.L. ; Montag, A.D. ; Sherman, S.S. ; et al.
Phys.Rev.Lett. 46 (1981) 761, 1981.
Inspire Record 10286 DOI 10.17182/hepdata.20641

Results are reported of an experiment to measure the cross section for production of the D*+ (D*−) in 200-GeV/c π−N interactions. We observe 78 ± 26 events corresponding to a D*-production cross section dσdy=1.6±0.5 μb at y=0.

1 data table
Table 1

No description provided.


Experimental Test of the {Drell-Yan} Model in $p W \to \mu^+ \mu^- X$

Smith, S.R. ; Childress, S. ; Mockett, P.M. ; et al.
Phys.Rev.Lett. 46 (1981) 1607, 1981.
Inspire Record 164176 DOI 10.17182/hepdata.20659

We report a high-statistics study of the reaction p+W→μ++μ−+X with use of an intense 400-GeV/c proton beam, a magnetized-iron beam dump, and a wide-acceptance detector. Using data near xF=0, we have extracted the nucleon sea-quark distribution and find it to be a factor 1.6±0.3 larger than that obtained by inelastic charged-current neutrino scattering. We then compare the Drell-Yan prediction with our data including the previously unexplored region of large xF and find excellent agreement for a wide range of μ-pair invariant mass.

6 data tables
Table 1

Dimuon mass mass distribution at XFP=0.1.

Table 2

Dimuon production for varying mass as function of XFP.

Table 3

Dimuon production for varying mass as function of XFP.

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QUASIELASTIC muon-neutrino n SCATTERING AT 3-GeV TO 30-GeV ENERGY

Belikov, S.V. ; Bugorsky, A.P. ; Epshtein, V.Sh. ; et al.
Yad.Fiz. 35 (1982) 59, 1982.
Inspire Record 166061 DOI 10.17182/hepdata.41296

None

1 data table
Table 1

Statistical errors only.


MECHANISM OF RESONANCE PRODUCTION IN FOUR PARTICLE EXCLUSIVE CHANNELS IN K- p INTERACTIONS AT 32-GeV/c

Bogolyubsky, M.Yu. ; Kotova, A.I. ; Levitsky, M.S. ; et al.
Yad.Fiz. 34 (1981) 1251, 1981.
Inspire Record 165498 DOI 10.17182/hepdata.41299

None

14 data tables
Table 1

CS FOR GIVEN REACTIONS BASED ON THE SAME STATISTICS FROM THE SAME EXPERIMENT ARE ALSO PRESENTED IN THE PAPER A.GIVERNAUD ET AL.,NP B160, 445, 1979, BUT NUMBERS ARE DIFFERENT DUE TO DIFFERENT CORRECTIONS FOR SLOW PROTONS.

Table 2

No description provided.

Table 3

No description provided.

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Space-time Characteristics of Radiation Region of Secondary Negative Pions, Produced in $\pi^- p$ Interactions at 40-{GeV}/$c$

Angelov, N. ; Akhababian, N. ; Grishin, V.G. ; et al.
Yad.Fiz. 35 (1982) 76, 1982.
Inspire Record 166105 DOI 10.17182/hepdata.39205

None

1 data table
Table 1

No description provided.


MEASUREMENTS OF LAMBDA0 POLARIZATION PRODUCED BY 40-GeV NEUTRONS ON CARBON NUCLEI IN INCLUSIVE PROCESSES

The Dubna-Berlin-Moscow-Prague-Sofiya-Tbilisi collaboration Aleev, A.N. ; Arefev, V.A. ; Balandin, V.P. ; et al.
JINR-P1-81-165, 1981.
Inspire Record 165431 DOI 10.17182/hepdata.39207

None

1 data table
Table 1

No description provided.


Measurement of the Ratio of Total and Differential Cross-sections on Neutron and Proton for Charged Current Neutrino Events

The BEBC TST Neutrino collaboration Armenise, N. ; Calicchio, M. ; Erriquez, O. ; et al.
Phys.Lett.B 102 (1981) 374-380, 1981.
Inspire Record 164906 DOI 10.17182/hepdata.31183

Charged-current neutrino interactions have been analysed in a sample of pictures from BEBC equipped with a TST. Using a method independent of both the neutrino flux and nuclear interaction corrections, the ratio R = σ n / σ p has been measured. The result is R =1.98±0.19 for the ratio of total cross sections. Bjorken x distributions for proton and neutron targets and for u and d quarks are compared.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.