Adam, W.
Max results
Sort by Reverse order

Showing 10 of 5726 results

Date

Deuteron and anti-deuteron production in CERN experiment NA44

The NA44 collaboration Simon-Gillo, Jehanne ; Boggild, H. ; Boissevain, J. ; et al.
Nucl.Phys.A 590 (1995) 483C-486C, 1995.
Inspire Record 407669 DOI 10.17182/hepdata.36518

The abundances of light nuclei probe the later stages of the evolution of a system formed in a relativistic heavy-ion collision. After the system has cooled and expanded, nucleons in close proximity and moving with small relative momenta coalesce to form nuclei. Light nuclei production enables the study of several topics, including the mechanism of composite particle production, freeze-out temperature, size of the interaction region, and entropy of the system. NA44 is the only relativistic heavy-ion experiment to have both deuteron and antideuteron results in both pA and AA collisions and the first CERN experiment to study the physics topics addressed by d and d production.

1 data table
Table 1

PRELIMINARY DATA.


Recent results from NA44 and a review of HBT

The NA44 collaboration Jacak, B.V. ; Boggild, H. ; Boissevain, J. ; et al.
Nucl.Phys.A 590 (1995) 215C-232C, 1995.
Inspire Record 407654 DOI 10.17182/hepdata.36517

None

1 data table
Table 1

PRELIMINARY DATA FOR CENTRAL EVENTS.


Charged hadron distributions in p A and A-A collisions at the CERN SPS

The NA44 collaboration Dodd, Jeremy ; Bøggild, H. ; Boissevain, J. ; et al.
Nucl.Phys.A 590 (1995) 523C-526C, 1995.
Inspire Record 407678 DOI 10.17182/hepdata.36504

Single particle distributions of π ± , K ± , p , p and d near mid-rapidity from 450 GeV/c p A and 200 GeV/c per nucleon SA collisions are presented. Inverse slope parameters are extracted from the transverse mass spectra, and examined for indications of collective phenomena. Proton and antiproton yields are determined for different projectile-target combinations. First results from 160 GeV/c per nucleon PbPb collisions are presented.

2 data tables
Table 1

No description provided.

Table 2

PRELIMINARY DATA FOR CENTRAL EVENTS.


Search for new particles decaying to dijets in p anti-p collisions at s**(1/2) = 1.8-TeV

The CDF collaboration Abe, F. ; Albrow, M.G. ; Amendolia, S.R. ; et al.
Phys.Rev.Lett. 74 (1995) 3538-3543, 1995.
Inspire Record 392053 DOI 10.17182/hepdata.42387

We have used 19 pb**-1 of data collected with the Collider Detector at Fermilab to search for new particles decaying to dijets. We exclude at 95% confidence level models containing the following new particles: axigluons with mass between 200 and 870 GeV, excited quarks with mass between 80 and 570 GeV, and color octet technirhos with mass between 320 and 480 GeV.

1 data table
Table 1

Here UNSPEC refers to axigluons, excited quarks, colour octet technirhos, ngauge bosons (W' and Z') and diquarks (D and Dc). M is the mass of the new particle (axigluon, q*, ...). Measurements are given to the 95% confidence limit.


Coupled channel analysis of anti-p p annihilation into pi0 pi0 pi0, pi0 eta eta and pi0 pi0 eta

The Crystal Barrel collaboration Amsler, C. ; Armstrong, D.S. ; Baker, C.A. ; et al.
Phys.Lett.B 355 (1995) 425-432, 1995.
Inspire Record 406130 DOI 10.17182/hepdata.28523

We confirm the existence of the two I G ( J PC ) = 0 + (0 ++ ) resonances f 0 (1370) and f 0 (1500) reported by us in earlier analyses. The analysis presented here couples the final states π 0 π 0 π 0 , π 0 π 0 η and π 0 ηη of p p annihilation at rest. It is based on a 3 × 3 K -matrix. We find masses and widths of M = (1390±30) MeV, Γ = (380±80) MeV; and M = (1500±10) MeV, Γ = (154 ± 30) MeV, respectively. The product branching ratios for the production and decay into π 0 π 0 and ηη of the f 0 (1500) are (1.27 ± 0.33) · 10 −3 and (0.60 ± 0.17) · 10 −3 , respectively.

1 data table
Table 1

No description provided.


Measurement of the elastic pi0 photoproduction cross-sections on C-12 and C-13

Gothe, R.W. ; Lang, W. ; Klein, S. ; et al.
Phys.Lett.B 355 (1995) 59-64, 1995.
Inspire Record 406122 DOI 10.17182/hepdata.28521

Absolute differential and integrated-over-angle cross sections for the reactions 12 C( γ , π 0 ) 12 C and 13 C( γ , π 0 ) 13 C leaving the residual nuclei in the ground state have been measured with tagged bremsstrahlung photons in the near threshold region (170.1 MeV ≤ E γ ≤ 176.8 MeV). This reaction mechanism is sensitive to the whole nuclear volume and the coherent processes which occur are revealed by comparing the extracted cross sections for both isotopes with each other and with theoretical calculations.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Observation of radiative anti-p p annihilation into a phi meson

The Crystal Barrel collaboration Amsler, C. ; Armstrong, D.S. ; Augustin, I. ; et al.
Phys.Lett.B 346 (1995) 363-370, 1995.
Inspire Record 401140 DOI 10.17182/hepdata.28709

The annihilation p p → Φγ has been investigated with the Crystal Barrel detector at LEAR for antiprotons stopped in liquid hydrogen. The observed branching ratio BR ( p p → Φγ = (1.7 ± 0.4) · 10 −5 is almost two orders of magnitude higher than expected from the OZI-rule. As a by-product, the branching ratios BR ( p p → K L K S ) = (9.0 ± 0.6) · 10 −4 and BR ( p p → Φπ 0 ) = (5.5 ± 0.7) · 10 −4 have been measured.

1 data table
Table 1

No description provided.


First observation of the production of nucleon resonances in anti-proton annihilation in liquid deuterium

The Crystal Barrel collaboration Amsler, C. ; Armstrong, D.S. ; Augustin, I. ; et al.
Phys.Lett.B 352 (1995) 187-192, 1995.
Inspire Record 405540 DOI 10.17182/hepdata.28705

None

1 data table
Table 1

No description provided.


Production of strange and multistrange hyperons and anti-hyperons in S W interactions at 200-GeV/c per nucleon

The WA85 collaboration Abatzis, S. ; Andrighetto, A. ; Antinori, F. ; et al.
Phys.Lett.B 359 (1995) 382-386, 1995.
Inspire Record 407557 DOI 10.17182/hepdata.34056

Strange and multistrange baryon and antibaryon production is a useful probe into the dynamics of the hot hadronic matter created in central heavy ion interactions. Relative production yields and transverse mass spectra are presented for Λ, Λ , Ξ − and Ξ + hyperons produced in central sulphur-tungsten interactions at 200 GeV/ c per nucleon.

4 data tables
Table 1

Distributions are fitted with (1/MT**1.5)*DN/DMT=CONST*EXP(-MT/SLOPE).

Table 2

No description provided.

Table 3

No description provided.

More…

E decay to eta pi pi in anti-p p annihilation at rest

The Crystal Barrel collaboration Amsler, C. ; Armstrong, D.S. ; Baker, C.A. ; et al.
Phys.Lett.B 358 (1995) 389-398, 1995.
Inspire Record 407517 DOI 10.17182/hepdata.28511

We have observed the ηπ + π − and ηπ 0 π 0 decay modes of the E meson in p p annihilation at rest into π + π − π 0 π 0 η . The mass and width of the E meson are 1409 ± 3 and 86 ± 10 MeV. The production and decay branching ratio is B( p p → Eππ)B(E → ηππ) = (3.3 ± 1.0) × 10 −3 . With a spin-parity analysis we determine that J P = 0 − . The observation of the ηπ 0 π 0 decay mode establishes that E is isoscalar ( C = +1). We find that E decays to η ( ππ ) s (where ( ππ ) s is an S-wave dipion) and πa 0 (980)(→ πη ) with a relative branching ratio of (78 ± 16) %. Using the K K π production and decay branching ratio measured earlier we determine that B[E → K K π] B[E → ηππ] = 0.61 ± 0.19 . A comparison with observations in radiative J Ψ decays suggests that E and ι η (1416) are identical.

1 data table
Table 1

Unobserved channels (E --> ETA 2PI0)2PI0 and (E --> ETA PI+ PI-)PI+PI- was taken into account.