N
Max results
Sort by Reverse order

Showing 10 of 469 results

Date

A Determination of alpha-s (M (Z0)) at LEP using resummed QCD calculations

The OPAL collaboration Acton, P.D. ; Alexander, G. ; Allison, John ; et al.
Z.Phys.C 59 (1993) 1-20, 1993.
Inspire Record 354188 DOI 10.17182/hepdata.14427

The strong coupling constant, αs, has been determined in hadronic decays of theZ0 resonance, using measurements of seven observables relating to global event shapes, energy correlatio

7 data tables
Table 1

Data corrected for finite acceptance and resolution of the detector and for intial state photon radiation. No corrections for hadronic effects are applied.. Errors include statistical and systematic uncertainties, added in quadrature.

Table 2

Data corrected for finite acceptance and resolution of the detector and for intial state photon radiation. No corrections for hadronic effects are applied.. Errors include statistical and systematic uncertainties, added in quadrature.

Table 3

Data corrected for finite acceptance and resolution of the detector and for intial state photon radiation. No corrections for hadronic effects are applied.. Errors include statistical and systematic uncertainties, added in quadrature.

More…

Observation of the p wave singlet state of charmonium

Armstrong, T.A. ; Bettoni, D. ; Bharadwaj, V. ; et al.
Phys.Rev.Lett. 69 (1992) 2337-2340, 1992.
Inspire Record 338054 DOI 10.17182/hepdata.42562

We have performed a search for the 1P1 state of charmonium resonantly formed in p¯p annihilations, close to the center of gravity of the 3PJ states. We report results from the study of the J/ψ+π0 and J/ψ+2π final states. We have observed a statistically significant enhancement in the p¯+p→J/ψ+π0 cross section at √s ≃3526.2 MeV. This enhancement has the characteristics of a narrow resonance of mass, total width, and production cross section consistent with what is expected for the 1P1 state. In our search we have found no candidates for the reactions p¯+p→J/ψ+π0+π0 and p¯+p→J/ψ+π++π−.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Electromagnetic dissociation of relativistic heavy ions in emulsion

Singh, G. ; Jain, P.L. ;
Z.Phys.A 344 (1992) 73-80, 1992.
Inspire Record 335378 DOI 10.17182/hepdata.18594

We report the results on the electromagnetic dissociation of 14.5A GeV28Si and 200A GeV16O projectiles in nuclear emulsion. The overall charge changing production cross sections are determined experimentally and are found to agree reasonably well with those computed theoretically. The relative rate as a function of decay energy for various reaction channels are parameterized in terms of an exponential function. Majority of the events in the most prominent decay modes can be attributed to the excitation of giant dipole resonances. Multiplicity distributions of α particles emerged from nuclear as well as electromagnetic interactions are also investigated.

4 data tables
Table 1

Electromagnetic dissociation.

Table 2

Electromagnetic dissociation.

Table 3

The cross section is calculated from the relation sigma=f/ro*lambda, were ro=7.898*10**22 atoms per cm**3 and f is a weight factor which is unity for nuclear interactions produced by all the emulsion targets, for AG f=0.62.

More…

Characteristics of the pion production and proton emission processes in proton - carbon nuclear collisions at 4.2-GeV/c momentum

Strugalski, Z. ; Sultanov, M. ;
JINR-E1-92-68, 1992.
Inspire Record 336351 DOI 10.17182/hepdata.39402

None

12 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

Fission fragment distribution following anti-proton absorption at rest on U-238

Machner, H. ; Jun, Sa ; Riepe, G. ; et al.
Z.Phys.A 343 (1992) 73-77, 1992.
Inspire Record 343229 DOI 10.17182/hepdata.16572

The distribution of nuclei resulting from the annihilation of stopped antiprotons on238U has been studied by an off-line measurement of the residual radioactivity. It was found that the probability of fission exceeds 84% (68% c.l.). The charge and mass distributions of the fission products can be separated into two parts, a more frequent symmetric component originating from high energy fission (excitation energy between 100 MeV and 1 GeV) and an asymmetric component from low energy fission (excitation energy less than 40 MeV).

1 data table
Table 1

The measured yields per 1000 stopped PBAR.


Rescattering in neutrino / anti-neutrino deuteron reactions

Tenner, A.G. ; Nikolaev, Nikolai N. ;
Nuovo Cim.A 105 (1992) 1001-1024, 1992.
Inspire Record 318863 DOI 10.17182/hepdata.37840

A study is made of the rescattering phenomenon in deuterons by means of an analysis of ν/xxx;-d interactions in the WA25 (BEBC) experiment at CERN. Experimental data are presented on the rescattering fraction, its energy and multiplicity dependence, on the rapidity spectra of specific particles, on the multiplicity properties of rescatter interactions, and on strange-particle production. Rescattering offers an opportunity to study the behaviour of the produced particlein statu nascendi. The experimental phenomena are discussed in the framework of the formation time formalism. The proper time of hadronization τf is evaluated to be ∼0.5fm/c. A possible reduction of formation time in low-multiplicity events is discussed. Some differences between neutrino and hadron-induced rescattering in deuterons are attributed to the constituent quark structure of pions and nucleons. The experimental results are relevant for the issue of quark-gluon plasma formation in heavy-ion collisions.

18 data tables
Table 1

ODD NUMBER OF HADRONS.

Table 2

ODD NUMBER OF HADRONS.

Table 3

ODD NUMBER OF HADRONS.

More…

Anti-proton production in 14.6-A/GeV/c Si + A collisions

The E-802 collaboration Abbott, T. ; Akiba, Y. ; Beavis, D. ; et al.
Phys.Lett.B 271 (1991) 447-452, 1991.
Inspire Record 318378 DOI 10.17182/hepdata.29302

Antiproton production cross sections have been measured for minimum bias and central Si+Al and Si+Au collisions at 14.6 A GeV c . The data presented cover the range of transverse momentum from 0.3 to 1.2 GeV c and lab rapidities from 1.1 to 1.7 units. The relative p π − and p K − yields are found to be the smallest for the heaviest system measured, central Si+Au collisions. For these collisions, the p π − ratio, determined from integrated yields for 1.1⩽ y ⩽1.7, is (0.84±0.07)×10 −3 . In the same rapidity interval, the average antiproton inverse m ⊥ slope is 141±14 MeV for central Si+Al and central Si+Au collisions.

2 data tables
Table 1

Definition of the CENTRAL and MINIMUM BIAS events see text.

Table 2

Definition of the CENTRAL and MINIMUM BIAS events see text.


Neutron emission from target nuclei induced by high-energy hadronic projectiles

Zielinska, M. ; Zawislawski, Z. ; Strugalski, Z. ; et al.
JINR-E1-91-386, 1991.
Inspire Record 324074 DOI 10.17182/hepdata.39364

None

1 data table
Table 1

No description provided.


A Measurement of the strong coupling constant alpha-s in W boson production at the CERN proton - anti-proton collider

Lindgren, M. ; Ikeda, M. ; Joyce, D. ; et al.
Phys.Rev.D 45 (1992) 3038-3041, 1992.
Inspire Record 317667 DOI 10.17182/hepdata.6542

The strong coupling constant αs has been determined from a study of the reaction p¯p→W±X, W→eν at s of 630 GeV in the UA1 experiment at CERN. The measurement is based upon a study of jet production in association with W bosons. The result obtained is αs(MW2)=0.127±0.026(stat)±0.034(syst).

2 data tables
Table 1

Systematic error not given.

Table 2

No description provided.


Topological characteristics of the charge exchange reaction H-3 ---> He-3 on neon and magnesium nuclei at 9-GeV/c

Avramenko, S.A. ; Aksinenko, V.D. ; Anikina, M.Kh. ; et al.
JINR-P1-91-240, 1991.
Inspire Record 319449 DOI 10.17182/hepdata.38713

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.