Th. Ullrich
Heidelberg University
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Featured researches published by Th. Ullrich.
Physics Letters B | 1998
G. Agakichiev; R. Baur; P. Braun-Munzinger; F. Ceretto; A. Drees; S. Esumi; U. Faschingbauer; Z. Fraenkel; C. Fuchs; E. Gatti; P. Glässel; C.P. de los Heros; P. Holl; Ch. Jung; B. Lenkeit; M. Messer; Y. Panebrattsev; A. Pfeiffer; J. Rak; I. Ravinovich; S. Razin; P. Rehak; M. Richter; M. Sampietro; N. Saveljic; J. Schukraft; S. Shimansky; W. Seipp; E. Socol; H.J. Specht
We report a measurement of low-mass electron pairs observed in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2<m<2.0 GeV is enhanced by a factor of 3.5 +/- 0.4 (stat) +/- 0.9 (syst) over the expectation from neutral meson decays. As observed previously in S-Au collisions, the enhancement is most pronounced in the invariant-mass region 300-700 MeV. For Pb-Au we find evidence for a strong increase of the enhancement with centrality. In addition, we show that the enhancement covers a wide range in transverse momentum, but is largest at the lowest observed pt.We report a measurement of low-mass electron pairs observed in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 < m < 2.0 GeV is enhanced by a factor of 3.5 +/- 0.4 (stat) +/- 0.9 (syst) over the expectation from neutral meson decays. As observed previously in S-Au collisions, the enhancement is most pronounced in the invariant-mass region 300-700 MeV. For Pb-Au we find evidence for a strong increase of the enhancement with centrality. In addition, we show that the enhancement covers a wide range in transverse momentum, but is largest at the lowest observed pt.Abstract We report a measurement of low-mass electron pairs observed in 158 GeV/nucleon Pb-Au collisions. The pair yield integrated over the range of invariant masses 0.2 ≤ m ≤ 2.0 GeV/c 2 is enhanced by a factor of 3.5 ± 0.4 (stat) ± 0.9 (syst) over the expectation from neutral meson decays. As observed previously in S-Au collisions, the enhancement is most pronounced in the invariant-mass region 300-700 MeV/c 2 . For Pb-Au we find evidence for a strong increase of the enhancement with centrality. In addition, we show that the enhancement covers a wide range in transverse momentum, but is largest at the lowest observed p ⊥ .
European Physical Journal C | 2005
G. Agakichiev; J. Bielcikova; R. Baur; P. Braun-Munzinger; A. Cherlin; S. Damjanovic; A. Drees; S. Esumi; U. Faschingbauer; Z. Fraenkel; E. Gatti; G. Hering; P. Holl; B. Lenkeit; F. Messer; M. Messer; O. Nix; A. Pfeiffer; J. Rak; I. Ravinovich; S. Razin; P. Rehak; M. Richter; M. Sampietro; H. Sako; N. Saveljic; W. Schmitz; J. Schukraft; W. Seipp; S. Shimanskiy
Abstract.We present the combined results on electron-pair production in 158 GeV/n Pb-Au (
European Physical Journal C | 1998
G. Agakichiev; M. Appenheimer; R. Averbeck; F. Ballester; R. Baur; A. Brenschede; J. Diaz; A. Drees; U. Faschingbauer; Jl Ferrero; Z. Fraenkel; M. Franke; C. Fuchs; E. Gatti; P. Glässel; Th. Günzel; C.P. de los Heros; F. Hess; R. Holzmann; Iourevitch; D. Irmscher; C Jacob; W. Kühn; B. Lenkeit; H. Löhner; A. Marín; Fm Marques; G. Martinez; Metag; M. Notheisen
\sqrt{s}
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1994
R. Baur; A. Breskin; R. Chechik; A. Drees; U. Faschingbauer; Peter Fischer; Z. Fraenkel; J. Gläss; P. Glässel; C.P. de los Heros; D. Irmscher; Reinhard Männer; A. Pfeiffer; A. Schön; J. Schukraft; Ch. Schwick; A. Shor; H.J. Specht; V. Steiner; S. Tapprogge; G. Tel-Zur; I. Tserruya; Th. Ullrich; J.P. Wurm
= 17.2 GeV) collisions taken at the CERN SPS in 1995 and 1996, and give a detailed account of the data analysis. The enhancement over the reference of neutral meson decays amounts to a factor of 2.31
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1993
Wei Chen; H.W. Kraner; Z. Li; P. Rehak; G. Bertuccio; E. Gatti; A. Longoni; M. Sampietro; P. Holl; J. Kemmer; U. Faschingbauer; F. Hess; C. Jacob; A. Wörner; J.P. Wurm; R. Baur; A. Drees; Peter Fischer; P. Glässel; Th. Günzel; D. Irmscher; L.H. Olsen; A. Pfeiffer; Bernhard M. W. Schmidt; A. Schoen; H.J. Specht; Th. Ullrich; S. Tapprogge; N. Wermes; A. Breskin
\pm0.19 (stat.)\pm0.55 (syst.)\pm0.69 (decays)
Nuclear Physics | 1998
G. Agakichiev; R. Baur; P. Braun-Munzinger; F. Ceretto; A. Drees; S. Esumi; U. Faschingbauer; Z. Fraenkel; C. Fuchs; E. Gatti; P. Glässel; C.P. de los Heros; P. Holl; Ch. Jung; B. Lenkeit; M. Messer; Y. Panebrattsev; A. Pfeiffer; J. Rak; I. Ravinovich; S. Razin; P. Rehak; M. Richter; M. Sampietro; N. Saveljic; J. Schukraft; S. Shimanskiy; W. Seipp; E. Socol; H.J. Specht
for semi-central collisions (28
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1996
G. Agakichiev; A. Drees; P. Glässel; D. Irmscher; G. Ososkov; Y. Panebrattsev; A. Pfeiffer; H.J. Specht; V. Steiner; I. Tserruya; Th. Ullrich
\%
Nuclear Physics | 1998
Federica Ceretto; G. Agakichiev; H. Appelshäuser; R. Baur; P. Braun-Munzinger; F. Ceretto; A. Cherlin; A. Drees; P. Ernst; S. Esumi; U. Faschingbauer; Z. Fraenkel; C. Fuchs; E. Gatti; P. Glässel; C.P. de los Heros; G. Hering; P. Holl; Ch. Jung; B. Lenkeit; A. Marín; M. Messer; D. Miskowiec; O. Nix; Y. Panebrattsev; A. Pfeiffer; J. Rak; I. Ravinovich; S. Razin; P. Rehak
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1996
U. Faschingbauer; G. Agakichiev; R. Baur; F. Ceretto; A. Dress; Z. Fraenkel; C. Fuchs; E. Gatti; P. Glässel; F. Hess; M. Hemberger; C.P. de los Heros; Peter Holl; D. Irmscher; C. Jacob; J. Kemmer; Y. Minaev; Y. Panebrattsev; A. Pfeiffer; I. Ravinovich; S. Razin; P. Rehak; M. Sampietro; J. Schukraft; S. Shimanskiy; E. Socol; H.J. Spech; G. Tel-Zur; I. Tserruya; Th. Ullrich
\sigma/\sigma_{geo}
Nuclear Physics | 1999
B. Lenkeit; S. Voloshin; P. Rehak; A. Cherlin; C. Voigt; J.P. Wessels; W. Schmitz; P. Braun-Munzinger; S. Razin; P. Glässel; D Miskowiec; S. Esumi; S S Shimansky; U. Faschingbauer; Th. Ullrich; P. Holl; A. Pfeiffer; Yu. Panebratsev; H.W. Kraner; J. Slivova; H.J. Specht; I. Ravinovich; E. Socol; G. Agakichiev; M. Richter; H. Appelshäuser; Ch. Jung; C. Fuchs; A. Drees; E. Gatti
) when yields are integrated over m > 200 MeV/c2 in invariant mass. The measured yield, its stronger-than-linear scaling with
