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AMPLITUDE ANALYSIS OF PION - NUCLEON SCATTERING AT 40-GeV/c

Siksin, V.V. ;
IFVE-87-64, 1987.
Inspire Record 249408 DOI 10.17182/hepdata.10164

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


rivet Analysis
Measurement of the Polarization of $\tau$ Leptons Produced in $e^+ e^-$ Annihilation at $\sqrt{s}=29$-{GeV}

Ford, William T. ; Qi, N. ; Read, Alexander L. ; et al.
Phys.Rev.D 36 (1987) 1971, 1987.
Inspire Record 245571 DOI 10.17182/hepdata.23349

We present measurements of forward-backward energy asymmetries of τ-lepton decay products from the reaction e+e−→τ+τ− in data collected with the MAC detector operating at the SLAC storage ring PEP at a center-of-mass energy of 29 GeV. The energy asymmetries for the decays τ→ντeν¯e, τ→ντμν¯μ, τ→ντπ, and τ→ντρ are interpreted as effects caused by the combination of maximally parity-violating weak τ decays and a longitudinal polarization produced by the interference of electromagnetic and weak processes. From the forward-backward polarization asymmetry AP=(0.06±0.07)×(1±0.011), we determine the coupling-constant product gaegvτ=(0.26 ±0.31)×(1±0.011). Assuming gae=-(1/2 as expected, we find gvτ=(-0.52±0.62)×(1±0.011), consistent with the prediction of the Glashow-Weinberg-Salam model of electroweak interactions. Alternatively, assuming the standard-model prediction of negligible polarization in τ-pair production, the leptonic energy spectra are used to measure the Michel parameter to be 0.79±0.10±0.10, consistent with the V-A hypothesis for the τν¯τ-W vertex.

1 data table
Table 1

No description provided.


The Study of Two-particle Correlations in Inelastic Interactions of Neon-22 Nuclei With Emulsion at 4.1-{GeV}/$c^-$per-nucleon

The Alma Ata-Bucharest-Leningrad-Dubna-Dushanbe-Yerevan-Kosice-Cracow - Leningrad-Moscow-Tashkent-Tbilisi-Ulan Bator-Zernograd collaboration Krasnov, S.A. ; Tolstov, K.D. ; Shabratova, G.S. ; et al.
Sov.J.Nucl.Phys. 47 (1988) 834-840, 1988.
Inspire Record 250785 DOI 10.17182/hepdata.9500

None

20 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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rivet Analysis
First Observation of $\gamma \gamma \to \omega \rho^0$

The ARGUS collaboration Albrecht, H. ; Andam, A.A. ; Binder, U. ; et al.
Phys.Lett.B 196 (1987) 101, 1987.
Inspire Record 247567 DOI 10.17182/hepdata.30104

The reaction γγ → 2 π + 2 π − π 0 has been studied using the the ARGUS detector at the e + e − storage ring DORIS II at DESY. The production of the vector-meson pair ωϱ 0 is observed for the first time. The cross section for γγ → ωϱ 0 and the topological cross section for γγ → 2 π + 2 π − π 0 are given. The angular distribution in ωϱ 0 events do not indicate any specific dominant spin-parity; they are consistent with isotropic production and decay of the ω and ϱ 0 mesons over the available W γγ range.

2 data tables
Table 1

Topological cross section.

Table 2

OMEGA RHO0 Production cross section.


First Observation of $\gamma \gamma \to \omega \omega$

The ARGUS collaboration Albrecht, H. ; Andam, A.A. ; Binder, U. ; et al.
Phys.Lett.B 198 (1987) 577-582, 1987.
Inspire Record 247566 DOI 10.17182/hepdata.30070

The reaction γγ → 2 π + 2 π − 2 π 0 has been studied using the ARGUS detector at the e + e − storage ring DORIS II at DESY. Production of ω mesons is observed and, in particular, the reaction γγ → ωω is seen for the first time. The cross section for γγ → ωω has an enhancement at ∼ 1.9 GeV/ c 2 of about 10 nb. The cross sections for γγ → 2 π + 2 π − 2 π 0 and γγ → ωπ + π − π 0 are also given.

3 data tables
Table 1

Topological cross section. 14 pct systematic uncertainty not included.

Table 2

Cross section for (omega omega) production. Additional 25 pct systematic error not included.

Table 3

Cross section for (omega pi+ pi- pi0) where (omega omega) events have been removed. Additional 15 pct systematic error not included.


>A Measurement of the $\bar{p} p \to \pi^+ \pi^-$ Reaction for 158-{MeV}/$c \le p(\bar{p}) \le$ 275-{MeV}/$c$

Bardin, G. ; Burgun, G. ; Calabrese, R. ; et al.
Phys.Lett.B 192 (1987) 471-474, 1987.
Inspire Record 246571 DOI 10.17182/hepdata.30155

A measurement of the total cross section for the reaction p p → π + π − has been performed for seven values of the incident momentum between 158 and 275 MeV/ c . The values obtained, if compared with previous results at higher momenta, agree with a 1/ß dependence. The differential cross section sssumed over the whole incident momentum range has also been measured and the result of a fit by Legendre polynomials is given.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

4*PI*LEG(L=0,P=4) = 1.07 +- 0.13 mb.


Search for Direct $\gamma$ Production at Low Transverse Momentum in 63-{GeV} $p p$ Collisions

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.
Phys.Rev.D 36 (1987) 2615, 1987.
Inspire Record 246577 DOI 10.17182/hepdata.23325

We have searched for direct photons of low PT (≤1.0 GeV/c) at θc.m.=90° in pp collisions at √s =63 GeV. We used two independent methods: direct detection in NaI crystals and conversion to e+e− pairs. No signal is observed; the photon spectrum is well described by the decay of hadrons. The result is consistent with a direct low-PT photon signal reported at √s =12 GeV, but excludes a rapid growth of soft-photon production with √s .

1 data table
Table 1

No description provided.


rivet Analysis
EXCLUSIVE PRODUCTION OF PROTON - ANTI-PROTON PAIRS IN TWO PHOTON COLLISIONS AT PEP

The TPC/Two Gamma collaboration Aihara, H. ; Alston-Garnjost, M. ; Avery, R.E. ; et al.
Phys.Rev.D 36 (1987) 3506, 1987.
Inspire Record 246557 DOI 10.17182/hepdata.23356

We report cross sections for the process γγ→pp¯ at center-of-mass energies W from 2.0 to 2.8 GeV. These results have been extracted from measurements of e+e−→e+e−pp¯ at an overall center-of-mass energy of 29 GeV, using the TPC/Two-Gamma facility at the SLAC storage ring PEP. Cross sections for the untagged mode [both photons nearly real] are shown to lie well above QCD predictions. Results are also presented for the single-tagged mode [one photon in the range 0.16<Q2<1.6 (GeV/c)2].

3 data tables
Table 1

Data read from graph in preprint. Statistical errors only.

Table 2

Data read from graph. Statistical errors only.

Table 3

Data read from graph. Statistical errors only.


Inclusive Characteristics of $\pi^-$ Mesons Produced in $p$ C and $p$ Ta Interactions at 10-{GeV}/$c$ Proton Momentum

Armutliisky, D.D. ; Akhababian, N.O. ; Grishin, V.G. ; et al.
Sov.J.Nucl.Phys. 48 (1988) 101-107, 1988.
Inspire Record 251090 DOI 10.17182/hepdata.9502

None

8 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

MOMENTUM SPECTRA IN THE WINDOW P=0.1-6.0 HAVE BEEN FITTED BY THE FORMULA: (1/N)*D(N)/D(P)=CONST(Q=1)*EXP(-SLOPE(Q=1)*P)+CONST(Q=2)*EXP (-SLOPE(Q=2)*P).

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CHARACTERISTICS OF FAST SECONDARY NEUTRONS IN p p AND p C-12 INTERACTIONS AT P = 10-GeV/c

Bekmirzaev, R.N. ; Grishin, V.G. ; Dolejsi, J. ; et al.
JINR-P1-87-443, 1987.
Inspire Record 251572 DOI 10.17182/hepdata.9496

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.