HEPData Search

The survival time spectrum of slow antineutrons produced in a LH2 target has been measured. From these data the imaginary part of the I=1 spin averaged S‐wave antineutron proton scattering length has been deduced to be Im a1= −0.83±0.07 fm. The result lies within the range of values calculated from current potential models.

1 data table

Table 1

THE VALUE AT PLAB = 0. HAVE BEEN OBTAINED BY EXTRAPOLATION.

Observation of the Decay $\rho \to \pi^+ \pi^- \gamma$. (In Russian)

Vasserman, I.B. ; Golubev, V.B. ; Dolinsky, S.I. ; et al.

Sov.J.Nucl.Phys. 47 (1988) 1035-1037, 1988.

Inspire Record 272215 DOI 10.17182/hepdata.37130

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

$D$ Meson Production From 400-{GeV}/$c p p$ Interactions. Evidence for Leading Diquarks?

The LEBC-EHS collaboration Aguilar-Benitez, M. ; Allison, W.W.M. ; Bailly, J.L. ; et al.

Phys.Lett.B 201 (1988) 176, 1988.

Inspire Record 252001 DOI 10.17182/hepdata.49611

Results of fitting the differential distributions in x F and p T 2 of D mesons produced in 400 GeV/ c p-p interactions to the form d 2 σ d x F d p T 2 ∝(1−x F ) n exp [−(p T 2 /〈p T 2 〉)] are discussed. The D + distribution is found to be relatively hard [ n =3.1±0.8〈 P t 2 〉=1.32±0.27 (GeV/ c ) 2 ] and the D̄ 0 distribution relatively soft [ n =8.1±1.9,〈 p T 2 〉=0.62±0.14 (GeV/ c ) 2 ] compared to the average for all D's [ n =4.9±0.5,〈 p T 2 〉=0.99±0.10 (GeV/ c ) 2 ]. It is suggested that these distributions could reflect contribution of leading di-quarks in pp collisions. Comparison is made with evidence for leading quarks in charm production in 360 GeV/ cπ − p interactions.

1 data table

Table 1

The invariant (C=INV) and non-invariant (C=NON-INV) distributions are fitted to (1-XL)**POWER. Pt distribution is fitted to EXP(-PT**2/SLOPE).

$D$ Meson Production From 400 GeV/$c p p$ Interactions

The LEBC-EHS collaboration Aguilar-Benitez, M. ; Allison, W.W.M. ; Bailly, J.L. ; et al.

Phys.Lett.B 189 (1987) 476, 1987.

Inspire Record 245101 DOI 10.17182/hepdata.12913

We have measured the inclusive production properties of D and D messons produced from pp interactions at s =27.4 GeV . The differential production cross section is well represented by the empirical form d 2 σ d x F d P 2 T = 1 2 [σ ( D / D )(n+1)b](1−|x F |) n exp (−bp 2 T ) with n=4.9 ± 0.5, b=(1.0±0.1)( GeV /c) −2 , and the inclusive D / D cross section σ ( D / D ) is (30.2±3.3) ωb. The QCD fusion model predicts D / D production which is in good agreement with our data except for the magnitude of the cross section which depends sensitively on the assumed mass of the charm quark.

11 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

Search for a Possible Exotic State C (1480) at the Vepp-2m Storage Ring

Aulchenko, V.M. ; Golubev, V.B. ; Dolinsky, S.I. ; et al.

JETP Lett. 45 (1987) 145-147, 1987.

Inspire Record 253283 DOI 10.17182/hepdata.2401

None

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

Suppression of Valence Quark Recombination in $\pi^+$ Fragmentation Into $\rho^+$

The EHS/NA22 collaboration Adamus, M. ; Azhinenko, I.V. ; Belokopytov, Yu.A. ; et al.

Phys.Lett.B 183 (1987) 425, 1987.

Inspire Record 238678 DOI 10.17182/hepdata.30207

We present inclusive ϱ ±,0 and ω cross sections in the beam fragmentation region of π + p interactions at 250 GeV/ c . The near equality of the ϱ + and ϱ 0 cross sections implies suppression of valence quark recombination in forward vector meson production.

1 data table

Table 1

No description provided.

Investigation of the Reaction $e^+ e^- \to \eta \pi^+ \pi^-$ in the Energy Range Up to 1.4-{GeV}

Druzhinin, V.P. ; Dubrovin, M.S. ; Eidelman, S.I. ; et al.

Phys.Lett.B 174 (1986) 115-117, 1986.

Inspire Record 234174 DOI 10.17182/hepdata.30258

The reaction e + e − → ηπ + π − has been studied with the Neutral Detector in the CM energy range 1.05–1.40 GeV at VEPP-2M. At the maximum energy the cross section exceeds the prediction of the vector dominance with one ϱ(770). The following upper limits for the electron width times branching ratio into ηπ + π − have been obtained for a resonance with a mass of 1.28 GeV and width of 0.08 GeV observed with the Omega-spectrometer at CERN: Λ ee · B ηππ < 9 eV, and for a ϱ′(1250) with a mass of 1.26 GeV and width of 0.125 GeV: Λ ee · B ηππ < 14 eV at 90% confidence level.

1 data table

Table 1

Axis error includes +- 10/10 contribution (RES-DEF(RES=ETA,DEF=530<M(2GAMMA)<570 MEV,BACK=CORRECTED)).

Study of the Reaction $e^+ e^- \to \pi^+ \pi^- \pi^0 \pi^0$ at (2 $e$) Up to 1.4-{GeV}

Kurdadze, L.M. ; Lelchuk, M.Yu. ; Pakhtusova, E.V. ; et al.

JETP Lett. 43 (1986) 643-645, 1986.

Inspire Record 240580 DOI 10.17182/hepdata.16834

None

1 data table

Table 1

No description provided.

SEARCH FOR THE DECAY K(S) ---> 2 GAMMA

Vasserman, I.B. ; Golubev, V.B. ; Gluskin, E.S. ; et al.

JETP Lett. 43 (1986) 588-590, 1986.

Inspire Record 239033 DOI 10.17182/hepdata.16835

None

1 data table

Table 1

No description provided.

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EXPERIMENTAL DATA ON MULTIPLICITIES IN CENTRAL COLLISIONS C-12 + C-12, F-19 + MG-24, MG-24 + MG-24 AT 3.7-GEV/NUCLEON. (IN RUSSIAN)

Measurement of the imaginary part of the I=1 $\bar{N} N$ S‐wave scattering length

Observation of the Decay $\rho \to \pi^+ \pi^- \gamma$. (In Russian)

$D$ Meson Production From 400-{GeV}/$c p p$ Interactions. Evidence for Leading Diquarks?

$D$ Meson Production From 400 GeV/$c p p$ Interactions

Search for a Possible Exotic State C (1480) at the Vepp-2m Storage Ring

Suppression of Valence Quark Recombination in $\pi^+$ Fragmentation Into $\rho^+$

Investigation of the Reaction $e^+ e^- \to \eta \pi^+ \pi^-$ in the Energy Range Up to 1.4-{GeV}

Study of the Reaction $e^+ e^- \to \pi^+ \pi^- \pi^0 \pi^0$ at (2 $e$) Up to 1.4-{GeV}

SEARCH FOR THE DECAY K(S) ---> 2 GAMMA