Chiba, M
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rivet Analysis
Study of pi+ pi- pair production in a two photon process at TRISTAN

The VENUS collaboration Yabuki, Fumiaki ; Abe, Koya ; Amako, Katsuya ; et al.
J.Phys.Soc.Jap. 64 (1995) 435-447, 1995.
Inspire Record 392360 DOI 10.17182/hepdata.38533

None

11 data tables
Table 1

ABS(COS(THETA)) < 0.4 for M(P=3 4) = 1.025 GeV.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of the Reactions $e^+ e^- \to e^+ e^-$ and $e^+ e^- \to \gamma \gamma$ at $\sqrt{s}=52$-{GeV}

The VENUS collaboration Abe, Koya ; Amako, Katsuya ; Arai, Yasuo ; et al.
J.Phys.Soc.Jap. 56 (1987) 3767-3770, 1987.
Inspire Record 251276 DOI 10.17182/hepdata.38511

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


MEASUREMENTS OF THE e+ e- TOTAL HADRONIC CROSS-SECTION AND A DETERMINATION OF M(Z) AND LAMBDA (MS)

The AMY collaboration Mori, T. ; Nozaki, T. ; Blanis, D. ; et al.
Phys.Lett.B 218 (1989) 499-507, 1989.
Inspire Record 276653 DOI 10.17182/hepdata.29847

The total cross section for e + e − annihilation into hadrons has been measured for CM energies ranging from 50 to 57 GeV. We fit the predictions of the standard model to these measurements and those at lower energies. The mass of the Z 0 boson, M Z , and the QCD scale parameter, Λ MS , are derived from the fit. The results are M Z =88.6 −1.8 +2.0 GeV/ c 2 , and Λ MS =0.15 −0.11 +0.16 GeV .

1 data table
Table 1

No description provided.


SEARCH FOR NARROW STRUCTURES IN ANTI-P P TOTAL CROSS-SECTION FROM 395-MEV/C TO 740-MEV/C

Nakamura, K. ; Aihara, H. ; Chiba, J. ; et al.
Phys.Rev.D 29 (1984) 349-362, 1984.
Inspire Record 202201 DOI 10.17182/hepdata.23686

We report the final results of a search for narrow structures in the p¯p total cross section between 395 and 740 MeV/c with a rms mass resolution of 1.5 MeV around the S-resonance region. A reanalysis of the data significantly improved the statistical accuracy. No evidence is found for narrow structures and a 90%-confidence-level upper limit of 24 mb MeV is set at around 500 MeV/c for the integrated cross section of a Breit-Wigner-type resonance of width ≲4 MeV.

1 data table
Table 1

No description provided.


Experimental Evidence for the Nonabelian Nature of {QCD}

The AMY collaboration Park, I.H. ; Schnetzer, S. ; Green, J. ; et al.
Phys.Rev.Lett. 62 (1989) 1713, 1989.
Inspire Record 276619 DOI 10.17182/hepdata.20045

We present evidence for the non-Abelian nature of QCD from a study of multijet events produced in e+e− annihilations from √s =50 to 57 GeV in the AMY detector at the KEK storage ring TRISTAN. A comparison of the three-jet event fraction at TRISTAN to the fraction of the DESY storage ring PETRA shows that the QCD coupling strength αs decreases with increasing Q2. In addition, measurements of the angular distributions of four-jet events show evidence for the triple-gluon vertex.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


EVIDENCE AGAINST THE NARROW S (1936) IN A MEASUREMENT OF ANTI-P P TOTAL CROSS-SECTION

Kamae, T. ; Aihara, H. ; Chiba, J. ; et al.
Phys.Rev.Lett. 44 (1980) 1439-1442, 1980.
Inspire Record 157934 DOI 10.17182/hepdata.20724

The total p¯p cross section has been measured in the S region by the transmission method with use of a beam-monitoring spectrometer. The result is inconsistent with the existence of the narrow resonance S(1936) with cross sections reported by previous experiments.

1 data table
Table 1

No description provided.


Anti-proton Proton Annihilation at Rest Into $\pi^0$ M and $\gamma$ M With M = $\phi$, $\eta^\prime$, $\omega$, $\rho^0$, $\eta$, and $\pi^0$

The Fukui-KEK-Kyoto Sangyo-Osaka-Tokyo Metropolitan collaboration Chiba, M. ; Fujitani, T. ; Iwahori, J. ; et al.
Phys.Rev.D 38 (1988) 2021, 1988.
Inspire Record 263258 DOI 10.17182/hepdata.23277

We have carried out high-statistics measurements of inclusive π0 and γ-ray spectra from p¯p annihilation at rest. From the monochromatic peaks in the π0 spectra, we derive the yield (or its upper limit) of the reaction p¯p→π0M for M=φ, η’, ω, ρ0, η, and π0. The same quantity was independently obtained from the γ-ray spectra, which included some π0’s that were mistaken as single γ rays due to the limited granularity of the γ detector. Taking the monochromatic peaks in the γ-ray spectra as being due to prompt γ rays, we also derive the upper limit for p¯p→γM.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Pontecorvo reactions in antiproton annihilation at rest in deuterium to pi0 n, pi0 Delta0, eta n and eta Delta0.

The Fukui-KEK-Kyoto Sangyo-Osaka-Tokyo Metropolitan collaboration Chiba, M. ; Fujitani, T. ; Iwahori, J. ; et al.
Phys.Rev.D 55 (1997) 2577-2583, 1997.
Inspire Record 424916 DOI 10.17182/hepdata.41181

Using modularized NaI(Tl) detectors, we carried out a high statistics measurement of inclusive γ-ray, π0, and η spectra, and determined the branching ratios or upper limits of Pontecorvo reactions p¯d→π0n, π0Δ0, ηn, and ηΔ0 from the corresponding monochromatic peaks in them. The obtained branching ratios are B(p¯d→π0n)=(1.03±0.41)×10−5, B(p¯d→π0Δ0)=(4.67±1.66)×10−5, B(p¯d→ηn)<8.94×10−6 (95% C.L.), and B(p¯d→ηΔ0)<6.49×10−5 (95% C.L.).

1 data table
Table 1

No description provided.


Measurement of monochromatic pi0 and eta mesons in antiproton deuterium annihilation at rest.

Chiba, M. ; Fujitani, T. ; Iwahori, J. ; et al.
KEK-PREPRINT-97-247, 1998.
Inspire Record 467591 DOI 10.17182/hepdata.38331

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


MEASUREMENTS OF CROSS-SECTIONS AND CHARGE ASYMMETRIES FOR e+ e- ---> tau+ tau- AND e+ e- ---> mu+ mu- FOR S**(1/2) FROM 52-GeV TO 57-GeV

The AMY collaboration Bacala, A. ; Malchow, R.L. ; Sparks, K. ; et al.
Phys.Lett.B 218 (1989) 112-118, 1989.
Inspire Record 265797 DOI 10.17182/hepdata.51370

Measurements of the differential cross sections for e + e − →μ + μ − and e + e − →τ + τ − at values of s from 52 to 57 GeV are reported. The forward-backward asymmetries and the total cross sections for these reactions are found to be in agreement with predictions of the standard model of the electro-weak interactions. These measurements are used to extract values of the weak coupling constant g v e g v l and g A e g A l , where l = μ or τ .

11 data tables
Table 1

Axis error includes +- 5/5 contribution (Included in the quoted errors for the total cross sections. The main contribution to SYS-ERR are the systematic uncertainty in the luminosity measurement and the uncertainty in the computer modeling of the various efficiencies and backgrounds).

Table 2

Axis error includes +- 5/5 contribution (Included in the quoted errors for the total cross sections. The main contribution to SYS-ERR are the systematic uncertainty in the luminosity measurement and the uncertainty in the computer modeling of the various efficiencies and backgrounds).

Table 3

No description provided.

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