HEPData Search

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Direct measurement of leptonic coupling asymmetries with polarized Z's.

The SLD collaboration Abe, K. ; Akagi, T. ; Allen, N.J. ; et al.

Phys.Rev.Lett. 79 (1997) 804-808, 1997.

Inspire Record 442260 DOI 10.17182/hepdata.19552

We present direct measurements of the $Z~0$-lepton coupling asymmetry parameters, $A_e$, $A_\mu$, and $A_\tau$, based on a data sample of 12,063 leptonic $Z~0$ decays collected by the SLD detector. The $Z$ bosons are produced in collisions of beams of polarized $e~-$ with unpolarized $e~+$ at the SLAC Linear Collider. The couplings are extracted from the measurement of the left-right and forward-backward asymmetries for each lepton species. The results are: $A_e=0.152 \pm 0.012 {(stat)} \pm 0.001 {(syst)}$, $A_\mu=0.102 \pm 0.034 \pm 0.002$, and $A_\tau=0.195 \pm 0.034 \pm 0.003$.

1 data table match query

Table 1

No description provided.

STUDY OF THE LEADING PROTON SPECTRA IN EXPERIMENTS ON 6.8-GEV/C PROTON SCATTERING ON PROTONS AND C, AL, CU, SN, PB NUCLEI. (IN RUSSIAN)

Ableev, V.G. ; Bodyagin, V.A. ; Vorobev, G.G. ; et al.

Yad.Fiz. 32 (1980) 1351-1356, 1980.

Inspire Record 159804 DOI 10.17182/hepdata.18015

None

1 data table match query

Table 2

DATA ON THE SUM OF ELASTIC AND QUASIELASTIC CROSS SECTIONS.

Observation of diffractive W boson production at the Tevatron

The CDF collaboration Abe, F. ; Akimoto, H. ; Akopian, A. ; et al.

Phys.Rev.Lett. 78 (1997) 2698-2703, 1997.

Inspire Record 440095 DOI 10.17182/hepdata.42230

We report the first observation of diffractively produced W bosons. In a sample of W -> e nu events produced in p-barp collisions at sqrt{s}=1.8 TeV, we find an excess of events with a forward rapidity gap, which is attributed to diffraction. The probability that this excess is consistent with non-diffractive production is 1.1 10^{-4} (3.8 sigma). The relatively low fraction of W+Jet events observed within this excess implies that mainly quarks from the pomeron, which mediates diffraction, participate in W production. The diffractive to non-diffractive W production ratio is found to be R_W=(1.15 +/- 0.55)%.

1 data table match query

Table 1

No description provided.

Double diffraction dissociation at the Fermilab Tevatron collider

The CDF collaboration Affolder, T. ; Akimoto, H. ; Akopian, A. ; et al.

Phys.Rev.Lett. 87 (2001) 141802, 2001.

Inspire Record 557212 DOI 10.17182/hepdata.42921

We present results from a measurement of double diffraction dissociation in $\bar pp$ collisions at the Fermilab Tevatron collider. The production cross section for events with a central pseudorapidity gap of width $\Delta\eta^0>3$ (overlapping $\eta=0$) is found to be $4.43\pm 0.02{(stat)}{\pm 1.18}{(syst) mb}$ [$3.42\pm 0.01{(stat)}{\pm 1.09}{(syst) mb}$] at $\sqrt{s}=1800$ [630] GeV. Our results are compared with previous measurements and with predictions based on Regge theory and factorization.

1 data table match query

Table 1

Cross sections for double diffractive production.