M. Della Negra
Collège de France
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Featured researches published by M. Della Negra.
Nuclear Physics | 1967
B. Conforto; B. Marechal; L. Montanet; M. Tomas; C. D'Anlau; A. Astier; J. Cohen-Ganouna; M. Della Negra; M. Baubillier; J. Duboc; F. James; M. Goldberg; D. Spencer
In the course of an extensive study of pp annihilations at rest involving KK pairs in the final state, 2000 events pp → K10K±K±π± and 364 events pp → K10K10π0 have been analyzed. This analysis shows that the K∗(891) is strongly produced. In addition, we observe a KK JP = 2+ resonance at 1280 MeV and a significant enhancement in the KK system at threshold, in I = 1. We also need S-wave (Kπ) amplitudes to reproduce the distribution of events on the Dalitz plot.
Physics Letters B | 1979
D. Drijard; W. Geist; O. Ullaland; G. Sajot; A. Minten; C. Ghesquiere; M. Della Negra; P. G. Innocenti; W. Hofmann; J. Stiewe; P. Burlaud; E.-E. Kluge; A. Norton; P. Frenkiel; Horst D. Wahl; M. Heiden; P. Hanke; S. Stein; D. Wegener; H. Frehse; R. Sosnowski; K. Rauschnabel; A. Putzer; V. Korbel; R. Gokieli; H.G. Fischer; D. Linglin; G. Fontaine; J. Spengler; M. Panter
Abstract Evidence for the forward production of D + mesons has been found in pp collisions at a c.m. energy of 52.5 GeV. A signal of 92 ± 18 events above background has been observed in the decay channel D + → K ∗ o π + → K − π + π + . The cross section in the phase space region of our experiment is given and implications for the total cross section for charmed D meson production are discussed.
Nuclear Physics | 1979
D. Drijard; H.G. Fischer; R. Gokieli; P. G. Innocenti; V. Korbel; A. Minten; A. Norton; R. Sosnowski; S. Stein; O. Ullaland; H. Wahl; P. Burlaud; M. Della Negra; G. Fontaine; P. Frenkiel; C. Ghesquiere; D. Linglin; G. Sajot; H. Frehse; E.-E. Kluge; A. Putzer; J. Stiewe; P. Hanke; W. Hofmann; W. Isenbeck; J. Spengler; D. Wegener
Abstract Inelastic events with an observed charged multiplicity n obs ⩾ 7 have been studied at the CERN ISR using the split field magnet detector. Correlations of particle densities, charges and transverse momenta have been determined and a phenomenological analysis in the framework of cluster models has been performed. A good description of all results is obtained if one allows for charged clusters, produced in a mechanism with limited charge exchange. The mean transverse momentum of clusters is 0.65 ± 0.10 GeV/ c . Short-range correlations of particles of like charge due to the Bose-Einstein effect can be described as a second-order interferrence phenomenon with a radius R = 1.34 ± 0.31 fm and a lifetime of cτ = 1.38 ± 0.60 fm for the pion source.
Physics Letters B | 1967
A. Astier; J. Cohen-Ganouna; M. Della Negra; B. Marechal; L. Montanet; M. Tomas; M. Baubillier; J. Duboc
Abstract We summarize the present experimental evidence for an I=1 (K K ¯ enhancement in p p ¯ annihilations at rest and at 1.2 GeV/c. We propose different possible interpretations for the enhancement.
Physics Letters B | 1969
M. Aguilar-Benitez; J. Barlow; L.D. Jacobs; P. Malecki; L. Montanet; M. Tomas; M. Della Negra; J. Cohen-Ganouna; B. Lörstad; N. West
Abstract Evidence from the K K decay mode for the splitting of the A 2 meson is presented.
Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1969
A. Bettini; M. Cresti; S. Limentani; L. Peruzzo; R. Santangelo; S. M. Sartori; M. Della Negra; L. Bertanza; A. Bigi; R. Carrara; R. Casali; P. Lariccia; C. Petri
SummaryWe have analysed the three-body annihilations at rest
Archive | 1969
A. Bettini; M. Cresti; S. Limentani; L. Peruzzo; R. Santangelo; S. M. Sartori; M. Della Negra; L. Bertanza; A. Bigi; R. Carrara; R. Casali; P. Lariccia; C. Petri
Nuclear Physics | 1979
D. Drijard; H.G. Fischer; W. Geist; R. Gokieli; P. G. Innocenti; V. Korbel; A. Minten; A. Norton; R. Sosnowski; S. Stein; O. Ullaland; H. Wahl; P. Burland; M. Della Negra; G. Fontaine; P. Frenkiel; C. Ghesquiere; D. Linglin; G. Sajot; H. Frehse; E.-E. Kluge; A. Putzer; J. Stiewe; P. Hanke; W. Hoffmann; W. Isenbeck; J. Spengler; D. Wegener
\overline p n \to K\overline K \pi
Nuclear Physics | 1978
D. Drijard; H.G. Fischer; R. Gokieli; P. G. Innocenti; V. Korbel; A. Minten; A. Norton; R. Sosnowski; S. Stein; H. Wahl; M. Della Negra; G. Fontaine; P. Frenkiel; C. Ghesquiere; D. Linglin; G. Sajot; H. Frehse; E.-E. Kluge; A. Putzer; J. Stiewe; P. Hanke; W. Hofmann; J. Spengler; D. Wegener
Nuclear Physics | 1969
M. Aguilar-Benitez; J. Barlow; L.D. Jacobs; P. Malecki; L. Montanet; Ch. d'Andlau; A. Astier; J. Cohen-Ganouna; M. Della Negra; B. Lörstad
, from a total sample of 2.22·105 annihilations. The annihilation at rest
