Green, J.
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Evidence for Planar Events and a Forward Double Jet Structure in Deep Inelastic Muon Scattering

The European Muon collaboration Aubert, J.J. ; Bassompierre, G. ; Becks, K.H. ; et al.
Phys.Lett.B 100 (1981) 433-438, 1981.
Inspire Record 164536 DOI 10.17182/hepdata.31213

The final states of charged hadrons produced in 280 GeV μp scattering are analysed with respect to their planarity and jet structure. Distributions of p ⊥ 2 in and p ⊥ out 2 are presented. A two jet structure in the forward hemisphere is observed for events with high p ⊥ tracks are predicted by QCD models.

2 data tables
Table 1

PTIN**2 is the sum of the PTIN components squared.

Table 2

PTOUT**2 is the sum of the PTOUT components squared.


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.


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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PRODUCTION RATIOS FOR HADRONS PRODUCED IN MUON PROTON INELASTIC SCATTERING AT 219-GEV

Proudfoot, J. ; Booth, N.E. ; Quirk, T.W. ; et al.
Phys.Rev.D 24 (1981) 2012-2015, 1981.
Inspire Record 172688 DOI 10.17182/hepdata.24051

Results on kaon, pion, and proton production in muon-proton scattering are presented for 1<Q2<80 GeV2 with an average Bjorken x of 0.033. The measured particle fractions for z>0.2(z=Phadν) are fπ=0.764±0.028, fK=0.187±0.042, and fp=0.049±0.013. The K±π± ratios as a function of z and pT2 are presented: The ratios increase with z, and with pT2 for z<0.3.

1 data table
Table 1

No description provided.


INCLUSIVE SIGMA+- (1385) PRODUCTION IN anti-p p INTERACTIONS AT 12-GeV/c

Karimaki, V. ; Kinnunen, R. ; Korkea-aho, M. ; et al.
Z.Phys.C 10 (1981) 189-195, 1981.
Inspire Record 164260 DOI 10.17182/hepdata.16474

Inclusive production of∑±(1385) resonances is studied in\(\bar pp\) interactions at 12 GeV/c. The cross sections for∑+(1385)+cc and∑− are determined to be 251±38 μb and 123±30 μb, respectively. The inclusive spectra are presented as a function of Feynman x, c.m. rapidity and the squared transverse momentumpT2. Significant differences with the correspondingpp data are found in the longitudinal momentum distributions. The qualitative features of the production can be explained by simple quark ideas.

1 data table
Table 1

Axis error includes +- 0.0/0.0 contribution (?////DUE TO CHOISE OF THE BACKGROUND PARAMETRIZATIONRES-DEF(RES= SIG(1385P13) ,BACK=CORRECTED,DEF=1.26 < M(P PI) < 1.80 GEV,C=PDG 1978)//RES-DEF(RES= ASIG(1385P13) ,BACK=CORRECTED,DEF=1.26 < M(AP PI) < 1.80 GEV,C=PDG 1978)).


Measurement of the $\pi^-$ Form-factor

Dally, E.B. ; Drickey, Darrell James ; Hauptman, J.M. ; et al.
Phys.Rev.D 24 (1981) 1718-1735, 1981.
Inspire Record 172687 DOI 10.17182/hepdata.26467

An experiment to measure the electromagnetic form factor of the negative π meson has been carried out at Fermilab by elastically scattering 100-GeV/c pions from the atomic electrons in a liquid-hydrogen target. We find that the elastic differential scattering cross section is characterized by a root-mean-square pion charge radius of 0.56±0.04 fm. This paper described our experimental design, measurement resolutions, event triggering logic, event reconstruction, experimental corrections, and form-factor results.

3 data tables
Table 1

No description provided.

Table 2

Axis error includes +- 0.54/0.54 contribution (EVENT-FINDING CORRECTIONS).

Table 3

No description provided.


Lepton Pair Production and Search for a New Heavy Lepton in $e^+ e^-$ Annihilation

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Grigull, R. ; et al.
Phys.Lett.B 99 (1981) 489-494, 1981.
Inspire Record 164302 DOI 10.17182/hepdata.27110

We have measured the reaction ee → μμ and ee → ττ at center of mass energies from 9.4 to 31.6 GeV. The production cross sections are in agreement with the predictions of quantum electrodynamics, resulting in cutoff parameter limits of 70–100 GeV at 95% c.l. The branching ratio for τ → μν ν has been determined as [1.78 ± 2.0 (statist.) ± 1.8(syst.)]% The existence of a new sequential heavy lepton with a mass <14.5 GeV is excluded at 95% c.l.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


COULOMB - NUCLEAR INTERFERENCE IN PROTON DEUTERIUM ELASTIC SCATTERING AT 600-MEV AND THE REAL PART OF P N SCATTERING AMPLITUDE

Gardes, J. ; Jargeaix, B. ; Lefort, A. ; et al.
Nuovo Cim.A 61 (1981) 121-132, 1981.
Inspire Record 170137 DOI 10.17182/hepdata.37549

The differential cross-sections for the elastic scattering of protons on deuterium have been measured at 600 MeV in the |t| range between 0.003 and 0.030 (GeV/c)2. The results are analysed by using the Bethe and Glauber formalisms taking into account spin effects in deuterium wave function and nucleon-nucleon amplitudes. The ratio between the real and the imaginary parts of the spin-independent protonneutron amplitude αpn deduced from dispersion calculations and phase shift analysis is compared with experimental results.

1 data table
Table 1

No description provided.


DELTA (1236) PRODUCTION IN ANTI-NEUTRINO n ---> mu+ n pi- REACTION AT HIGH-ENERGIES

Efremenko, V.I. ; Fedotov, A.V. ; Gorichev, P.A. ; et al.
ITEP-83-1981, 1981.
Inspire Record 167553 DOI 10.17182/hepdata.40191

None

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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