A. Filippi
University of Turin
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Featured researches published by A. Filippi.
Physics Letters B | 2004
M. Abdel-Bary; S. Abdel-Samad; K.-Th. Brinkmann; H. Clement; E. Doroshkevich; M. Drochner; S. Dshemuchadse; A. Erhardt; W. Eyrich; D. Filges; A. Filippi; H. Freiesleben; M. Fritsch; J. Georgi; A. Gillitzer; D. Hesselbarth; R. Jäkel; B. Jakob; L. Karsch; K. Kilian; H. Koch; J. Kress; E. Kuhlmann; L. Naumann; S. Marcello; S. Marwinski; R. Meier; P. Michel; K. Möller; H. Mörtel
The hadronic reaction pp -->Sigma+ K0 p was measured exclusively at a beam momentum of 2.95 GeV/c using the TOF detector at the COSY storage ring. A narrow peak was observed in the invariant mass spectrum of the K0 p subsystem at 1530 +- 5 MeV/c2 with a significance of 4 - 6 standard deviations, depending on background assumptions. The upper limit of 18 +- 4 MeV/c2 (FWHM) for its width is given by the experimental resolution. The corresponding total cross section is estimated to be about 0.4 +- 0.1(stat) +- 0.1(syst) microbarn. Since a resonance in this subsystem must have strangeness S = + 1 we claim it to be the Theta+ state for which very recently evidence was found in various experiments.
Physics Letters B | 2005
M. Agnello; G. Beer; L. Benussi; M. Bertani; H. Bhang; S. Bianco; E. Botta; M. Bregant; T. Bressani; L. Busso; D. Calvo; P. Camerini; M. Caponero; P. Cerello; B. Dalena; F. De Mori; G. D'Erasmo; D. Di Santo; R. Donà; D. Elia; F. Fabbri; D. Faso; A. Feliciello; A. Filippi; V. Filippini; R. Fini; M.E. Fiore; H. Fujioka; P. Gianotti; N. Grion
Lambda-hypernuclei are produced and studied, with the FINUDA spectrometer, for the first time at an e+e- collider: DAPHNE, the Frascati phi-factory. The slow negative kaons from phi(1020) decay are stopped in thin (0.2 g/cm^2) nuclear targets, and Lambda-hypernuclei formation is detected by measuring the momentum of the outgoing pi^-. A preliminary analysis on 12Lambda-C shows an energy resolution of 1.29 MeV FWHM on the hypernuclear levels, the best obtained so far with magnetic spectrometers at hadron facilities. Capture rates for the ground state and the excited ones are reported, and compared with previous experiments.
Physics Letters B | 1999
A. Zenoni; A. Bianconi; G. Bonomi; M. Corradini; A. Donzella; E. Lodi Rizzini; L. Venturelli; A. Bertin; M. Bruschi; M. Capponi; S. De Castro; R. Donà; D. Galli; Benedetto Giacobbe; U. Marconi; I. Massa; M. Piccinini; R. Spighi; V. Vagnoni; S. Vecchi; M. Villa; A. Vitale; A. Zoccoli; M. Poli; C. Cicalò; A. Masoni; S. Mauro; G. Puddu; S. Serci; G. Usai
Abstract The pp total annihilation cross section has been measured, with the Obelix apparatus at LEAR, at ten values of the antiproton incident momentum between 43 and 175 MeV/c. The values of the cross section show that the well known 1 p behaviour of the annihilation cross section is drastically modified at very low momenta, which demonstrates the important role of the Coulomb force in low energy pp interaction. Moreover, they do not present any explicit resonant behaviour. Finally, when compared to potential model calculations, the data suggest that the percentage of P-wave in pp interaction around 50 MeV/c antiproton incident momentum is less than 5%.
Physical Review Letters | 2012
M. Agnello; L. Benussi; M. Bertani; H. Bhang; G. Bonomi; E. Botta; M. Bregant; T. Bressani; S. Bufalino; L. Busso; D. Calvo; P. Camerini; B. Dalena; F. De Mori; G. D’Erasmo; F. Fabbri; A. Feliciello; A. Filippi; E. M. Fiore; A. Fontana; H. Fujioka; P. Genova; P. Gianotti; N. Grion; V. Lucherini; S. Marcello; N. Mirfakhrai; F. Moia; O. Morra; T. Nagae
Evidence for the neutron-rich hypernucleus H-6(Lambda) is presented from the FINUDA experiment at DA Phi NE, Frascati, studying (pi(+), pi(-)) pairs in coincidence from the (K) over bar (-)(stop) + Li-6 -> H-6(Lambda) + pi(+) production reaction followed by H-6(Lambda) -> He-6 + pi(-) weak decay. The production rate of H-6(Lambda) undergoing this two-body pi(-) decay is determined to be (2.9 +/- 2.0) x 10(-6)/K-stop(-). Its binding energy, evaluated jointly from production and decay, is B-Lambda(H-6(Lambda)) = (4.0 +/- 1.1) MeV with respect to 5H + Lambda. A systematic difference of (0.98 +/- 0.74) MeV between B-Lambda values derived separately from decay and from production is tentatively assigned to the H-6(Lambda) 0(g.s)(+) excitationEvidence for the neutron-rich hypernucleus 6{\Lambda}H is presented from the FINUDA experiment at DA{\Phi}NE, Frascati, studying ({\pi}+, {\pi}-) pairs in coincidence from the K- +6Li \rightarrow 6 H+{\pi}+ production reaction followed by 6{\Lambda}H \rightarrow 6He + {\pi}- weak decay. The production rate of 6{\Lambda}H undergoing this two-body {\pi}- decay is determined to be (2.9\pm2.0)\cdot10-6/K-. Its binding energy, evaluated jointly from production and decay, is B{\Lambda}(6{\Lambda}H) = (4.0\pm1.1) MeV with respect to 5H+{\Lambda}. A systematic difference of (0.98 \pm 0.74) MeV between B{\Lambda} values derived separately from decay and from production is tentatively assigned to the 6{\Lambda}H 0+g.s. \rightarrow 1+ excitation.
Physical Review Letters | 2011
M. Agnello; L. Benussi; M. Bertani; H. Bhang; G. Bonomi; E. Botta; M. Bregant; T. Bressani; S. Bufalino; L. Busso; D. Calvo; P. Camerini; B. Dalena; F. De Mori; G. D'Erasmo; F. Fabbri; A. Feliciello; A. Filippi; E. M. Fiore; A. Fontana; H. Fujioka; P. Genova; P. Gianotti; N. Grion; V. Lucherini; S. Marcello; N. Mirfakhrai; F. Moia; O. Morra; T. Nagae
Evidence for the neutron-rich hypernucleus H-6(Lambda) is presented from the FINUDA experiment at DA Phi NE, Frascati, studying (pi(+), pi(-)) pairs in coincidence from the (K) over bar (-)(stop) + Li-6 -> H-6(Lambda) + pi(+) production reaction followed by H-6(Lambda) -> He-6 + pi(-) weak decay. The production rate of H-6(Lambda) undergoing this two-body pi(-) decay is determined to be (2.9 +/- 2.0) x 10(-6)/K-stop(-). Its binding energy, evaluated jointly from production and decay, is B-Lambda(H-6(Lambda)) = (4.0 +/- 1.1) MeV with respect to 5H + Lambda. A systematic difference of (0.98 +/- 0.74) MeV between B-Lambda values derived separately from decay and from production is tentatively assigned to the H-6(Lambda) 0(g.s)(+) excitationEvidence for the neutron-rich hypernucleus 6{\Lambda}H is presented from the FINUDA experiment at DA{\Phi}NE, Frascati, studying ({\pi}+, {\pi}-) pairs in coincidence from the K- +6Li \rightarrow 6 H+{\pi}+ production reaction followed by 6{\Lambda}H \rightarrow 6He + {\pi}- weak decay. The production rate of 6{\Lambda}H undergoing this two-body {\pi}- decay is determined to be (2.9\pm2.0)\cdot10-6/K-. Its binding energy, evaluated jointly from production and decay, is B{\Lambda}(6{\Lambda}H) = (4.0\pm1.1) MeV with respect to 5H+{\Lambda}. A systematic difference of (0.98 \pm 0.74) MeV between B{\Lambda} values derived separately from decay and from production is tentatively assigned to the 6{\Lambda}H 0+g.s. \rightarrow 1+ excitation.
Physics Letters B | 1999
A. Zenoni; A. Bianconi; F Bocci; G. Bonomi; M. Corradini; A. Donzella; E. Lodi Rizzini; L. Venturelli; A. Bertin; M. Bruschi; M. Capponi; S. De Castro; R. Donà; D. Galli; Benedetto Giacobbe; U. Marconi; I. Massa; M. Piccinini; R. Spighi; V. Vagnoni; S. Vecchi; M. Villa; A. Vitale; A. Zoccoli; C. Cicalò; A. Masoni; S. Mauro; G. Puddu; S. Serci; G. Usai
Abstract The p p total annihilation cross section has been measured at four values of the p incident momentum, between 70 MeV/c and 38 MeV/c, with the Obelix apparatus at LEAR. The new measurements are in agreement with the trend of previous measurements of the p p total annihilation cross section at low energy, performed by the Obelix experiment [A. Bertin et al., Phys. Lett. B 369 (1996) 77; A. Benedettini et al., Nucl. Phys. B (Proc. Suppl.) 56A (1997) 58], as well as with a fit of the latter data based on a low energy expansion of the scattering amplitude [J. Carbonell, K.V. Protasov, A. Zenoni, Phys. Lett. B 397 (1997) 345]. The departure of the annihilation cross section from a smooth behaviour, suggested by a previous measurement of the cross section around 44 MeV/c [A. Bertin et al., Phys. Lett. B 369 (1996) 77], is not confirmed by the new data.
Physics Letters B | 2001
S. Abd El-Samad; M. Abdel-Bary; K.-Th. Brinkmann; H. Clement; S. Dshemuchadse; H. Dutz; W. Eyrich; A. Erhardt; D. Filges; A. Filippi; H. Freiesleben; M. Fritsch; J. Georgi; A Gillitzer; D. Hesselbarth; B Jakob; L. Karsch; K. Kilian; Hans Koch; J. Kreß; E. Kuhlmann; S. Marcello; S. Marwinski; S. Mauro; W. Meyer; P. Michel; K. Möller; H. Mörtel; H. P. Morsch; L. Naumann
The cross section for the production of
European Physical Journal A | 2003
M. Abdel-Bary; S. Abdel-Samad; Robert C. Bilger; K.-Th. Brinkmann; H. Clement; S. Dshemuchadse; E. Dorochkevitch; H. Dutz; W. Eyrich; A. Erhardt; D. Filges; A. Filippi; H. Freiesleben; M. Fritsch; R. Geyer; A. Gillitzer; D. Hesselbarth; B. Jakob; L. Karsch; K. Kilian; H. Koch; J. Kreß; E. Kuhlmann; S. Marcello; S. Marwinski; S. Mauro; W. Meyer; P. Michel; K. Möller; H. P. Morsch
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Physics Letters B | 2009
M. Agnello; A. Andronenkov; G. Beer; L. Benussi; M. Bertani; H. Bhang; G. Bonomi; Elena Botta; M. Bregant; T. Bressani; S. Bufalino; L. Busso; D. Calvo; P. Camerini; B. Dalena; F. De Mori; G. D'Erasmo; F. Fabbri; A. Feliciello; A. Filippi; E. M. Fiore; A. Fontana; H. Fujioka; P. Genova; P. Gianotti; N. Grion; O. Hartmann; B. Kang; V. Lenti; V. Lucherini
mesons in proton-proton collisions has been measured in a previously unexplored region of incident energies. Cross sections were extracted at 92 MeV and 173 MeV excess energy, respectively. The angular distribution of the
Physics Letters B | 2010
S. Abdel-Samad; M. Abdel-Bary; K. Brinkmann; H. Clement; J. Dietrich; E. Dorochkevitch; S. Dshemuchadse; K. Ehrhardt; A. Erhardt; W. Eyrich; C. Fanara; D. Filges; A. Filippi; H. Freiesleben; M. Fritsch; W. Gast; J. Georgi; A. Gillitzer; J. Gottwald; J. Hauffe; D. Hesselbarth; H. Jaeger; B. Jakob; R. Jaekel; L. Karsch; K. Kilian; H. Koch; M. Krapp; J. Kress; E. Kuhlmann
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