Mazzoni, M.A.
P NUCLEUS --> MU+ MU- X
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Parton energy loss limits and shadowing in Drell-Yan dimuon production.

The NuSea collaboration Vasilev, M.A. ; Beddo, M.E. ; Brown, C.N. ; et al.
Phys.Rev.Lett. 83 (1999) 2304-2307, 1999.
Inspire Record 501230 DOI 10.17182/hepdata.19445

A precise measurement of the ratios of the Drell-Yan cross section per nucleon for an 800 GeV/c proton beam incident on Be, Fe and W targets is reported. The behavior of the Drell-Yan ratios at small target parton momentum fraction is well described by an existing fit to the shadowing observed in deep-inelastic scattering. The cross section ratios as a function of the incident parton momentum fraction set tight limits on the energy loss of quarks passing through a cold nucleus.

13 data tables
Table 1

Ratios of measured cross sections per nucleon for Drell Yan events versus di-muon mass.

Table 2

Ratios of measured cross sections per nucleon for Drell Yan events versus X2.

Table 3

Ratios of measured cross sections per nucleon for Drell Yan events versus XL.

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Observation of polarization in bottomonium production at s**(1/2) = 38.8-GeV

The NuSea collaboration Brown, C.N. ; Awes, T.C. ; Beddo, M.E. ; et al.
Phys.Rev.Lett. 86 (2001) 2529-2532, 2001.
Inspire Record 536629 DOI 10.17182/hepdata.19423

We present a measurement of the polarization observed for bottomonium states produced in p-Cu collisions at sqrt(s)=38.8 GeV. The angular distribution of the decay dimuons of the Upsilon(1S) state show no polarization at small xF and pT but significant positive transverse production polarization for either pT > 1.8 GeV/c or for xF > 0.35. The Upsilon(2S+3S) unresolved states show a large transverse production polarization at all values of xF and pT measured. These observations are compared with an NRQCD calculation that predicts a transverse polarization in bottomonium production arising from quark-antiquark fusion and gluon-gluon fusion diagrams.

6 data tables
Table 1

The observed polarization in the Drell-Yan sideband region as a function of PT. There is an additional systematic uncertainty of 0.02 in the polarization measurements.

Table 2

The observed polarization in the Drell-Yan sideband region as a function of XL. There is an additional systematic uncertainty of 0.02 in the polarization measurements.

Table 3

The observed polarization in the UPSILON(1S) region as a function of PT. There is an additional systematic error of 0.06 in the polarization measurements.

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Excess of continuum dimuon production at masses between threshold and the J/psi in S W interactions at 200-GeV/c/nucleon.

The HELIOS/3 collaboration Angelis, A.L.S. ; Antos, J. ; Beaulieu, M. ; et al.
Eur.Phys.J.C 13 (2000) 433-452, 2000.
Inspire Record 472127 DOI 10.17182/hepdata.49491

Results are presented on dimuon production for invariant masses ranging from the dimuon threshold up to the $J/\Psi$ meson. Proton-tungsten and sulphur-tungsten int

8 data tables
Table 1

No description provided.

Table 2

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Table 3

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Measurements of the Phi (rho + omega) ratio in a large kinematic region in p W and S W interactions

The HELIOS/3 collaboration Mazzoni, M.A. ;
Nucl.Phys.A 544 (1992) 623C-626C, 1992.
Inspire Record 343257 DOI 10.17182/hepdata.36665

We present our first results on φ and ϱ+ω production in pW and SW collisions at 200 GeV/nucleon, obtained using the HELIOS/3 muon spectrometer, which measures dimuons in a large acceptance in transverse momentum and rapidity. The data show a clear increase of the ratio φ/(ϱ+ω) going from pW to SW collisions and a slight increase from peripheral to central SW collisions. This the case for low (p t ≤ 0.6GeV/c) and high (p t > 0.6 GeV/c) transverse momentum. The rise is due to an increase in the number of produced φ mesons.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Dimuon and vector meson production in p W and S W interactions at 200-GeV/c/nucleon

The HELIOS/3 collaboration Mazzoni, M.A. ;
Nucl.Phys.A 566 (1994) 95C-102C, 1994.
Inspire Record 378632 DOI 10.17182/hepdata.36535

The focus of this experiment is on dimuons at low M T but the mass range up to the J ψ is also covered. Dimuons are measured over a wide rapidity interval, ranging from nearly central to very forward rapidities. We present the experimental results in different kinematic regions and as a function of charged multiplicity. The observed dimuon spectra are also compared to conventional sources of lepton pairs production.

5 data tables
Table 1

No description provided.

Table 2

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Table 3

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