HEPData Search

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Production of $\rho^\pm$, $G^\pm$(1700), $A2^\pm$, $K^{\pm}$(890) and $K^{\pm}$(1420) at 50-{GeV}/c

Delfosse, A. ; Dorsaz, P.A. ; Extermann, P. ; et al.

Nucl.Phys.B 183 (1981) 349-366, 1981.

Inspire Record 170363 DOI 10.17182/hepdata.34280

Mesons decaying into π 0 or η and one charged meson were studied using a liquid-argon calorimeter in a non-magnetic double-arm spectrometer. Cross sections and energy dependences are presented. The ϱ ± production mechanisms are discussed in detail: ω and π exchange contribute the largest fractions, but also A 2 exchange is present. ϱ ± production by ω exchange is shown to follow the energy behaviour predicted by the Regge trajectory α ω ( t ) = 0.4 − | t |.

2 data tables

Table 1

Axis error includes +- 0.0/0.0 contribution (13 TO 25////STATISTICAL ERRORS ARE SMALLER THAN THE SYSTEMATIC ERRORS).

Table 2

No description provided.

Lepton Pair Production and Search for a New Heavy Lepton in $e^+ e^-$ Annihilation

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Grigull, R. ; et al.

Phys.Lett.B 99 (1981) 489-494, 1981.

Inspire Record 164302 DOI 10.17182/hepdata.27110

We have measured the reaction ee → μμ and ee → ττ at center of mass energies from 9.4 to 31.6 GeV. The production cross sections are in agreement with the predictions of quantum electrodynamics, resulting in cutoff parameter limits of 70–100 GeV at 95% c.l. The branching ratio for τ → μν ν has been determined as [1.78 ± 2.0 (statist.) ± 1.8(syst.)]% The existence of a new sequential heavy lepton with a mass <14.5 GeV is excluded at 95% c.l.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Evidence for a New Pseudoscalar Meson

Bonesini, M. ; Donald, R.A. ; Edwards, D.N. ; et al.

Phys.Lett.B 103 (1981) 75-78, 1981.

Inspire Record 170357 DOI 10.17182/hepdata.31149

Performing a PWA of the π − π − π + system over the −t p/p range 0.2 to 0.4 GeV 2 we find evidence for a J P = 0 − , J G =1 − meson of mass 1342 ± 20 MeV and width 220 ±70 MeV decaying into ϵπ. This state is produced by natural parity exchange with a slope similar to that of elastic scattering. It can be interpreted as a radial excitation of the π meson (π′).

1 data table

Table 1

INTEGRATING EXTRAPOLATED EXPONENTIAL FIT GIVES A TOTAL CROSS SECTION OF ABOUT 54 MUB.

Observation of a $K \bar{K}$ Enhancement at 1.85-{GeV} in the Reaction $K^- P \to K \bar{K} \Lambda$ at 8.25-{GeV}/c

The BIRMINGHAM-CERN-GLASGOW-MICHIGAN STATE-PARIS collaboration Al- Harran, S. ; Amirzadeh, J. ; Baubillier, M. ; et al.

Phys.Lett.B 101 (1981) 357-360, 1981.

Inspire Record 170589 DOI 10.17182/hepdata.31206

In a high statistics ( ∼150 eV μb ) bubble chamber experiment on K − p interactions at 8.25 GeV c , the study of the reaction K − p → KK Λ provides evidence for an enhancement in the KK system with a mass of (1850 ± 10) MeV and a width of (80 −30 +40 ) MeV. Its possible identification with the missing isosinglet of the 3 − nonet is discussed. A K ∗ K decay mode is also observed.

1 data table

Table 1

No description provided.

$\Delta (\Sigma^-$l) and $\Delta$ (Sigma-t) Between 200-{MeV} and 520-{MeV}

Axen, D. ; Shypit, R. ; Comyn, M. ; et al.

J.Phys.G 7 (1981) L225-L230, 1981.

Inspire Record 171520 DOI 10.17182/hepdata.38530

New pp measurements of Delta sigma L and Delta sigma T between 200 and 520 MeV disagree with earlier Argonne data, and resolve discrepancies with inelastic data, phase-shift analysis and forward dispersion relations.

2 data tables

Table 1

TOTAL CROSS SECTION DIFFERENCE FOR PURE TRANSVERSE SPIN STATES (ANTIPARALLEL MINUS PARALLEL).

Table 2

TOTAL CROSS SECTION DIFFERENCE FOR PURE LONGITUDINAL SPIN STATES (ANTIPARALLEL MINUS PARALLEL).

Hadronic Cross-section in $e^+ e^-$ Annihilation From 1.45-{GeV} to 1.80-{GeV}

Esposito, B. ; Marini, A. ; Piano Mortari, Giovanni ; et al.

Lett.Nuovo Cim. 30 (1981) 65-71, 1981.

Inspire Record 170172 DOI 10.17182/hepdata.37368

None

2 data tables

Table 1

CROSS SECTION EXCLUDES ANY CONTRIBUTION FROM TWO-BODY FINAL STATES (PI+ PI- AND K+ K-).

Table 2

CHARGED AND NEUTRAL MULTIPLICITIES.

INVESTIGATION OF THE DIFFRACTIVE DISSOCIATION IN PROTON PROTON COLLISION AT THE MOMENTUM OF 20.8-GeV/c. (IN RUSSIAN)

Azimov, S.A. ; Saidkhanov, N.Sh. ; Suleimanova, M. ;

Yad.Fiz. 34 (1981) 77-79, 1981.

Inspire Record 170591 DOI 10.17182/hepdata.17757

None

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

STUDY OF THE OKUBO-ZWEIG-IIZUKA RULE VIOLATING REACTIONS PI+ N ---> PHI P AND PI+ P ---> PHI DELTA++ AT 10-GEV/C

Hendrickson, J.S. ; Denney, D.L. ; Gorbics, M. ; et al.

Phys.Rev.D 24 (1981) 2526-2528, 1981.

Inspire Record 171894 DOI 10.17182/hepdata.24036

We have measured the cross sections for the Okubo-Zweig-Iizuka-rule-violating reactions π+n→φp and π+p→φΔ++ at 10 GeV/c using the large-aperture-solenoid spectrometer at the Stanford Linear Accelerator Center. We measure the total cross sections for these two reactions to be 179±72 nb for the φp reaction and 172±75 nb for the φΔ++ reaction. Both of these cross sections are consistent with the hypothesis of the φ being produced solely by its nonstrange-quark component as determined from the octet-singlet mixing angle resulting from application of the Gell-Mann—Okubo mass formula to the vector-meson nonet. These data are thus inconsistent with an ideally mixed φ meson.

1 data table

Table 1

Axis error includes +- 0.0/0.0 contribution (RES-DEF(RES=DEL(1232P33)++,BACK=CORRECTED)//RES-DEF(RES=PHI,BACK=CORRECTED)//GLAUBER).

SEARCH FOR A NARROW RESONANCE IN E+ E- ANNIHILATION AROUND 1.5-GEV

Baldini-Celio, R. ; Battistoni, G. ; Capon, G. ; et al.

Lett.Nuovo Cim. 30 (1981) 337-341, 1981.

Inspire Record 170173 DOI 10.17182/hepdata.37341

None

1 data table

Table 1

UNNORMALIZED MULTIHADRON TOTAL CROSS SECTION ENERGY SCAN.

Measurement on $\pi^+ \pi^- \pi^0 \pi^0$, $\pi^+ \pi^- \pi^+ \pi^- \pi^0$, $\pi^+ \pi^- \pi^+ \pi^- \pi^0 \pi^0$, $\pi^+ \pi^- \pi^+ \pi^- \pi^+ \pi^-$ Production Cross-sections in $e^+ e^-$ Annihilation at 1.45-{GeV} - 1.80-{GeV} Center-of-mass Energy

Esposito, B. ; Marini, A. ; Piano Mortari, Giovanni ; et al.

Lett.Nuovo Cim. 31 (1981) 445-452, 1981.

Inspire Record 170489 DOI 10.17182/hepdata.37329

None

3 data tables

Table 1

No description provided.

Table 2

CROSS SECTIONS FOR POSITIVE AND NEGATIVE G-PARITY FINAL STATES (EVEN AND ODD NUMBERS OF PIONS).

Table 3

No description provided.

Date

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Production of $\rho^\pm$, $G^\pm$(1700), $A2^\pm$, $K^{\pm}$(890) and $K^{\pm}$(1420) at 50-{GeV}/c

Lepton Pair Production and Search for a New Heavy Lepton in $e^+ e^-$ Annihilation

Evidence for a New Pseudoscalar Meson

Observation of a $K \bar{K}$ Enhancement at 1.85-{GeV} in the Reaction $K^- P \to K \bar{K} \Lambda$ at 8.25-{GeV}/c

$\Delta (\Sigma^-$l) and $\Delta$ (Sigma-t) Between 200-{MeV} and 520-{MeV}

Hadronic Cross-section in $e^+ e^-$ Annihilation From 1.45-{GeV} to 1.80-{GeV}

INVESTIGATION OF THE DIFFRACTIVE DISSOCIATION IN PROTON PROTON COLLISION AT THE MOMENTUM OF 20.8-GeV/c. (IN RUSSIAN)

STUDY OF THE OKUBO-ZWEIG-IIZUKA RULE VIOLATING REACTIONS PI+ N ---> PHI P AND PI+ P ---> PHI DELTA++ AT 10-GEV/C

SEARCH FOR A NARROW RESONANCE IN E+ E- ANNIHILATION AROUND 1.5-GEV

Measurement on $\pi^+ \pi^- \pi^0 \pi^0$, $\pi^+ \pi^- \pi^+ \pi^- \pi^0$, $\pi^+ \pi^- \pi^+ \pi^- \pi^0 \pi^0$, $\pi^+ \pi^- \pi^+ \pi^- \pi^+ \pi^-$ Production Cross-sections in $e^+ e^-$ Annihilation at 1.45-{GeV} - 1.80-{GeV} Center-of-mass Energy