Date

Study of Quark Fragmentation at 29-GeV: Global Jet Parameters and Single Particle Distributions

Bender, D. ; Derrick, M. ; Fernandez, E. ; et al.
Phys.Rev.D 31 (1985) 1, 1985.
Inspire Record 201482 DOI 10.17182/hepdata.23581

In this paper, results are presented from a study of the hadronic final states in e+e− annihilation at 29 GeV. The data were obtained with the High Resolution Spectrometer (HRS) at the SLAC PEP e+e− colliding-beam facility. The results are based on 6342 selected events corresponding to an integrated luminosity of 19.6 pb−1. The distributions of the events in sphericity (S), thrust (T), and aplanarity (A) are given and compared to other e+e− data in the same energy range. We measure 〈S〉=0.130±0.003±0.010 and 〈1-T〉=0.100±0.002. The sphericity distribution is compared to sphericity measurements made for beam jets in hadronic collisions as well as jets studied in neutrino scattering. The data sample is further reduced to 4371 events with the two-jet selections, S≤0.25 and A≤0.1. The single-particle distributions in the longitudinal and transverse directions are given. For low values of the momentum fraction (z=2p/W), the invariant distribution shows a maximum at z∼0.06, consistent with a QCD expectation. The data at high Feynman x (xF) show distribution consistent with being dominated by a (1-xf)2 variation for the leading quark-meson transition. The rapidity distribution shows a shallow central minimum with a height (1/NevdNh/dY‖Y=0=2.3±0.02±0.07. The mean charged multiplicity is measured to be 〈nch〉=13.1±0.05±0.6. The mean transverse momentum relative to the thrust axis 〈pT〉 rises as a function of z to a value of 0.70±0.02 GeV/c for z≳0.3. The distributions are compared to those measured in other reactions.

25 data tables

New values supplied 6.7.87 by M.Derrick.

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New values supplied 6.7.87 by M. Derrick.

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Study of Transverse Momenta of Charged Hadrons Produced in Neutrino $p$ and Anti-neutrino $p$ Charged Current Interactions

The Birmingham-CERN-London-Munich-Oxford collaboration Jones, G.T. ; Kennedy, B.W. ; Middleton, R.P. ; et al.
Z.Phys.C 25 (1984) 121, 1984.
Inspire Record 201590 DOI 10.17182/hepdata.16211

Data from a neutrino and antineutrino hydrogen experiment with BEBC are used to investigate transverse properties of the produced charged hadrons. Measurements are presented on average transverse momenta of charged pions as functions of Feynman-x and the hadronic mass, on the transverse momentum flow within an event and on jet-related quantities. The main features of the data are well described by the LUND model. The data favour a version of the model in which soft gluon effects are included and the primordial transverse momentum of the quarks in the proton is small. Effects from 1st order QCD (hard gluon emission) are negligible.

6 data tables

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PROTON CHARACTERISTICS AS A FUNCTION OF CUMULATIVE VARIABLE IN C Ta: COLLISIONS AT 4.2-GeV/c PER NUCLEON

Gasparian, A.P. ; Ivanovskaya, I.A. ; Mehdiyev, Rashid R. ;
Yad.Fiz. 41 (1985) 1229-1234, 1985.
Inspire Record 203307 DOI 10.17182/hepdata.39061

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20 data tables

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PROTONS INVOLVED HAVE MAXIMUM VALUE OF CUMULATIVE VARIABLE (E-PL)/M IN EVENT.

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Observation of Two Nonleading Strangeness 1 Vector Mesons

Aston, D. ; Carnegie, R.K. ; Dunwoodie, W.M. ; et al.
Phys.Lett.B 149 (1984) 258-262, 1984.
Inspire Record 201412 DOI 10.17182/hepdata.33871

We present evidence for the existence of two strange J P = 1 − mesons; one at 1410 MeV/c 2 coupling principally to K ∗ (892)π , and the other at 1790 MeV/c 2 couplingto K π , K ∗ π and ϱ K. The data derive from a partial wave analysis of the K 0 π + π − system produced in the reaction K − p → K 0 π + π − n at 11 GeV /c . The production mechanism and quark model assignment of each state are discussed. The state at 1410 MeV/c 2 most naturally understood as the first radial excitation of the K ∗ (892), and the 1790 MeV/c 2 object can be interpreted as the triplet D wave partner to the 3 − K ∗ (1780).

1 data table

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A Measurement of the Pion Charge Radius

Amendolia, S.R. ; Badelek, B. ; Batignani, G. ; et al.
Phys.Lett.B 146 (1984) 116-120, 1984.
Inspire Record 201598 DOI 10.17182/hepdata.30511

We report a measurement of the negative pion electromagnetic form factor in the range of space-like four-momentum transfer 0.014 < q 2 < 0.122 (GeV/ c ) 2 . The measurement was made by the NA7 collaboration at the CERN SPS, by observing the interaction of 300 GeV pions with the electrons of a liquid hydrogen target. The form factor is fitted by a pole form with a pion radius of 〈r 2 〈 1 2 = 0.657 ± 0.012 fm.

1 data table

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TOTAL CROSS-SECTION OF HADRON PHOTOPRODUCTION ON Be, C, H2O AND Al NUCLEI IN THE ENERGY RANGE E (gamma) = 200-MeV TO 900-MeV

Arakelian, E.A. ; Bayatian, G.L. ; Grigorian, N.K. ; et al.
EFI-730-45-84-YEREVAN, 1984.
Inspire Record 206946 DOI 10.17182/hepdata.2700

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2 data tables

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MEASUREMENT OF POLARIZATION IN THE pi- p ---> pi0, n, pi0 ---> 2 gamma REACTION AT 40-GeV/c WITH THE REGISTRATION OF ALL REACTION PRODUCTS

Borisov, N.S. ; Kazarinov, Yu.M. ; Liburg, M.Yu. ; et al.
JINR-P1-84-311, 1984.
Inspire Record 203007 DOI 10.17182/hepdata.9904

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2 data tables

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Multiplicity, Momentum and Angular Characteristics of $\pi^-$ Mesons for $p$ C, $d$ C, $\alpha$ C and C C Interactions at 4.2-{GeV}/$c$ Per Nucleon

The Alma Ata-Baku-Belgrade-Bucharest-Dubna-Kishinev-Leipzig- Moscow-Prague-Samarkand-Sofiya-Tashkent-Tbilisi-Ulan Bator-Varna collaboration Agakishiev, G.N. ; Akhababian, N. ; Armutliisky, D. ; et al.
Z.Phys.C 27 (1985) 177, 1984.
Inspire Record 203342 DOI 10.17182/hepdata.1999

Light ion collisions with carbon target at 4.2 GeV/c/N are studied. Pion multiplicity distributions, momentum and angular spectra are analysed. These data are described in terms of models assuming independent interactions of nucleons from the projectile nucleus with the target.

18 data tables

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Reactions With Two Neutral Kaons Inclusive Production in $K^+ p$ Interactions at 32-{GeV}/$c$

The Soviet-CERN collaboration Azhinenko, I.V. ; Belokopytov, Yu.A. ; Garuchava, Z.Sh. ; et al.
Sov.J.Nucl.Phys. 41 (1985) 214, 1985.
Inspire Record 203792 DOI 10.17182/hepdata.10670

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4 data tables

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