HEPData Search

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$D^{*\pm}$ Production in Jets at the {CERN} {SPS} Collider

The UA1 collaboration Arnison, G. ; Allkofer, O.C. ; Astbury, A. ; et al.

Phys.Lett.B 147 (1984) 222-226, 1984.

Inspire Record 203147 DOI 10.17182/hepdata.30497

We report evidence for the production of the charged D ∗ mesons in pp̄ collisions at s = 540 GeV . The search was confined to the charged particle fragments of hadronic jets, which are expected to be predominantly gluon jets in this experiment. The fragmentation function and production rate for D ∗ in jets of average transverse momentum of 28 GeV/ c are given.

1 data table

Table 1

THE D*'S ARE CONSIDERED AS ARISING ONLY FROM FRAGMENTATION OF HADRONIC JETS ('GLUON' JETS). HERE THE <PT> OF THE JET IS AROUND 28 GEV THE DEFINITION OF Z IS P(D*).P(JET)/(P(JET))**2.

FRAGMENTATION IN NEUTRINO AND ANTI-NEUTRINOS CHARGED CURRENT INTERACTIONS ON PROTON AND NEUTRON

The AMSTERDAM-BERGEN-BOLOGNA-PADUA-PISA-SACLAY-TURIN collaboration Allasia, D. ; Angelini, C. ; Baldini, A. ; et al.

Z.Phys.C 24 (1984) 119-131, 1984.

Inspire Record 207322 DOI 10.17182/hepdata.16217

Some experimental properties of the charged hadronic fragments are compared for νp, νn,$\bar vp$ and$\bar vn$ interactions: multiplicities of forward and backward going particles,xF distributions for pions, fragmentation functions and theirQ2 andW2 dependence. The results are compared with the predictions of the Lund fragmentation model.

1 data table

Table 1

No description provided.

Quark Jets from Antineutrino Interactions II: Inclusive Particle Spectra and Multiplicities in the Quark Jets

Ammosov, V.V. ; Denisov, A.G. ; Gapienko, G.S. ; et al.

Nucl.Phys.B 203 (1982) 1-15, 1982.

Inspire Record 156746 DOI 10.17182/hepdata.41254

We present results on inclusive particle production in the antineutrino charged current induced hadron jets observed in the Fermilab 15 ft bubble chamber. Fractional energy distributions, particle ratios and average multiplicities of the hadrons in the jets are measured. Ratios between the inclusive production rates of different mesons in the jets are studied to seek evidence for the d-quark origin of the observed hadrons. Good over-all agreement with the hypothesis of d-quark fragmentation with universal fragmentation functions obeying isospin systematics is established.

13 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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PROPERTIES OF D* PRODUCTION IN e+ e- ANNIHILATION AT 29-GeV

The HRS collaboration Ahlen, S.P. ; Akerlof, C. ; Baranko, G. ; et al.

HRS-CP-83-3, 1983.

Inspire Record 192098 DOI 10.17182/hepdata.13343

None

2 data tables

Table 1

D* FRAGMENTATION FUNCTION.

Table 2

R VALUE IS RADIATIVELY CORRECTED (BUT NOT CROSS SECTION).

Inclusive Charged Hadron Spectra in $\nu A$ and $\bar{\nu} A$ Interactions at $E_{\nu/\bar{\nu}} < 30$-{GeV}

Baranov, D.S. ; Ermolaev, V.I. ; Hleborad, V.I. ; et al.

Z.Phys.C 21 (1984) 197, 1984.

Inspire Record 195756 DOI 10.17182/hepdata.41124

We present inclusive spectra of charged hadrons produced in$\begin{array}{*{20}c}{( - )}\\v\\ \end{array}$-Freon interactions at average beam energies of about 6 GeV. The experiment was done using the bubble chamber SKAT at the 70 GeV Serpukhov accelerator. In the hadronic energy range,W<5 GeV, dominantly isotropic events are found. The transverse momentum of the produced particles shows no strongW2-dependence. Feynman-scaling may be reached forW2≳10 GeV2, where also theż-spectra are described by the predictions of the parton model. All experimental data are reproduced rather well also by a Monte Carlo model based on ordinary phase space.

13 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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NEUTRAL STRANGE PARTICLE PRODUCTION IN ANTI-NEUTRINOS INDUCED NEUTRAL CURRENT INTERACTIONS

Asratian, A.E. ; Efremenko, V.I. ; Fedotov, A.V. ; et al.

Phys.Lett.B 140 (1984) 127-129, 1984.

Inspire Record 200832 DOI 10.17182/hepdata.10145

The study of neutral strange particle production in antineutrino-induced neutral current interactions is presented. The total multiplicity of neutral strange particles and the K 0 multiplicity in the current fragmentation region ( z >0.3) are used to estimate in two ways the coupling strength of the weak neutral current to the strange quark.

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Inclusive D0 and $D^+$ Production in $e^+ e^-$ Annihilation at 29-{GeV}

Derrick, M. ; Fernandez, E. ; Fries, R. ; et al.

Phys.Rev.Lett. 53 (1984) 1971, 1984.

Inspire Record 202899 DOI 10.17182/hepdata.51258

We have observed inclusive production of D0 and D+ mesons, and their charge conjugates, in e+e− annihilation at 29 GeV on the basis of a data sample of 106 pb−1. These signals correspond to R values of R(D0+D―0)=1.8±0.5 and R(D++D−)=1.2±0.4. Taking the D+ and D0 data together, we measure a charge asymmetry of A=−0.08±0.12 for charmed quarks. A comparison of R(D+D―) with R(D*+D―*) obtained via the process D*+→D0π+ gives a DD* ratio of 1.0−0.2+0.3, indicating that direct D* production dominates over direct D production.

4 data tables

Table 1

No description provided.

Table 2

EXTRAPOLATED TO ALL Z.

Table 3

No description provided.

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Charm Quark Production and Fragmentation in $e^+ e^-$ Annihilation at 29-{GeV}

Derrick, M. ; Fernandez, E. ; Fries, R. ; et al.

Phys.Lett.B 146 (1984) 261-265, 1984.

Inspire Record 202898 DOI 10.17182/hepdata.51261

The electroweak production asymmetry and the decay fragmentation function for e + e − → c c have been measured at s = 29 GeV using charged D ∗ production over the full kinematic range. The data were taken at PEP using the High Resolution Spectrometer. The measured asymmetry is −0.12 ± 0.08. The total production cross section in units of the point cross section corrected for initial state radiation is R D ∗ = 2.7 ± 0.9 .

2 data tables

Table 1

ASSUMES SIG(D*+) = SIG(D*0). (EXPT. MEASURES D*+ PRODUCTION ONLY). R VALUE CORRECTED FOR INITIAL STATE RADIATION.

Table 2

No description provided.

rivet Analysis
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

Table 1

New values supplied 6.7.87 by M.Derrick.

Table 2

No description provided.

Table 3

New values supplied 6.7.87 by M. Derrick.