HEPData Search

Showing 10 of 25 results

K*(892)0 production in relativistic heavy ion collisions at S(NN)**(1/2) = 130-GeV.

The STAR collaboration Adler, C. ; Ahammed, Z. ; Allgower, C. ; et al.

Phys.Rev.C 66 (2002) 061901, 2002.

Inspire Record 587235 DOI 10.17182/hepdata.54898

We report the first observation of $K^{\star}(892)^{0}\to\pi K$ in relativistic heavy ion collisions. The transverse momentum spectrum of $(K^{\star0}+\bar{K}^{\star0})/2$ from central Au+Au collisions at $\sqrt{s_{_{NN}}}=130$ GeV is presented. The ratios of the $K^{\star0}$ yield derived from these data to the yields of negative hadrons, charged kaons, and $\phi$ mesons have been measured in central and minimum bias collisions and compared with model predictions and comparable $e^{+}e^{-}$, $pp$, and $\bar{p}p$ results. The data indicate no dramatic reduction of $K^{\star0}$ production in relativistic heavy ion collisions despite expected losses due to rescattering effects.

4 data tables

Table 1

Transverse mass spectrum of K*0 with YRAP = -0.5 to 0.5 for the 14 PCT most central interactions. Numerical values requested from the authors.

Table 2

K*0 to negative hadron ratio using hadron data from Adler et al PRL 87,112303(2001).

Table 3

K*0 to kaon ratio using STAR kaon data.

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Study of D*+ production in nu/mu charged current interactions in the NOMAD experiment.

The NOMAD collaboration Astier, P. ; Autiero, D. ; Baldisseri, A. ; et al.

Phys.Lett.B 526 (2002) 278-286, 2002.

Inspire Record 567771 DOI 10.17182/hepdata.49701

A search was made among ν μ charged current events collected in the NOMAD experiment for the reaction: ν μ +N→μ − +D ★+ + hadrons ↪ D 0 +π + ↪ K − +π + . A high purity D ★+ sample composed of 35 events was extracted. The D ★+ yield in ν μ charged current interactions was measured to be T =(0.79±0.17(stat.)±0.10(syst.))%. The mean fraction of the hadronic jet energy taken by the D ★+ is 0.67±0.02(stat.)±0.02(syst.). The distributions of the fragmentation variables z, P T 2 and x F for D ★+ are also presented.

5 data tables

Table 1

Distribution in Feynman X.

Table 2

Distribution in transverse momentum.

Table 3

Distribution in fractional energy Z.

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A study of strange particle production in nu/mu charged current interactions in the NOMAD experiment.

The NOMAD collaboration Astier, P. ; Autiero, D. ; Baldisseri, A. ; et al.

Nucl.Phys.B 621 (2002) 3-34, 2002.

Inspire Record 566751 DOI 10.17182/hepdata.48925

A study of strange particle production in muon neutrino charged current interactions has been performed using the data from the NOMAD experiment. Yields of neutral strange particles K0s, Lambda, AntiLambda have been measured. Mean multiplicities are reported as a function of the event kinematic variables Enu, W2 and Q2 as well as of the variables describing particle behaviour within a hadronic jet: xF, z and pT2. Decays of resonances and heavy hyperons with identified K0s and Lambda in the final state have been analyzed. Clear signals corresponding to K*+-, Sigma*+-, Xi- and Sigma0 have been observed.

20 data tables

Table 1

Measured yields of the neutral strange particles measured in this analysis.The second line (marked *) is a recalculation taking into account contributions from both primary and secondary V0. The values for K0 are the K0S rates multipl ied by 2.

Table 2

Measured yields as a function of E, the neutrino energy.

Table 3

Measured yields as a function of W**2.

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rivet Analysis
Energy dependence of event shapes and of alpha(s) at LEP-2.

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.

Phys.Lett.B 456 (1999) 322-340, 1999.

Inspire Record 499183 DOI 10.17182/hepdata.49129

Infrared and collinear safe event shape distributions and their mean values are determined using the data taken at five different centre of mass energies above M Z with the DELPHI detector at LEP. From the event shapes, the strong coupling α s is extracted in O ( α s 2 ), NLLA and a combined scheme using hadronisation corrections evaluated with fragmentation model generators as well as using an analytical power ansatz. Comparing these measurements to those obtained at M Z , the energy dependence (running) of α s is accessible. The logarithmic energy slope of the inverse strong coupling is measured to be d α −1 s d log (E cm ) =1.39±0.34( stat )±0.17( syst ) , in good agreement with the QCD expectation of 1.27.

47 data tables

Table 1

Moments of the (1-THRUST) distributions at cm energies 133, 161, 172 and 183 GeV.

Table 2

Moments of the Thrust Major distributions at cm energies 133, 161, 172 and 183 GeV.

Table 3

Moments of the Thrust Minor distributions at cm energies 133, 161, 172 and 183 GeV.

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Study of the reaction pi- p ---> eta-prime eta-prime n

Berdnikov, E.B. ; Bityukov, S.I. ; Borisov, G.V. ; et al.

Z.Phys.C 57 (1993) 13-16, 1993.

Inspire Record 340793 DOI 10.17182/hepdata.14498

The reaction π−p→η′η′n has been studied atpπ=37 GeV/c. Total of 14 events of this reaction have been selected. It has been shown that in the effective mass spectrum of the η′η′ system the events are concentrated mainly near the reaction threshold, which might be caused by the decayX(1910)→η′η′. The reaction cross-section has been evaluated: σ(π−p→η′η′n)=110±40 nb.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Study of Hadronic Decays of the $\Z^0$ Boson

The DELPHI collaboration Aarnio, P. ; Abreu, P. ; Adam, W. ; et al.

Phys.Lett.B 240 (1990) 271-282, 1990.

Inspire Record 294894 DOI 10.17182/hepdata.49562

Hadronic decays of Z 0 bosons are studied in the Delphi detector. Global event variables and singel particles inclusive distributions are compared with QCD-based predictions. The mean charged multiplicity is found to be 20.6±1.0 (stat+syst). The mean values of the sphericity, aplanarity, thrust, minor value, p in T and p out T are compared with values found at lower energy e + e − colliders.

13 data tables

Table 1

Corrected Sphericity distribution. Statistical errors only.

Table 2

Corrected Aplanarity distribution. Statistical errors only.

Table 3

Corrected Q3-Q2 distribution. Statistical errors only.