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Featured researches published by T. Massam.


Lettere Al Nuovo Cimento | 1981

Evidence for a new particle with naked «beauty» and for its associated production in high-energy (pp) interactions

M. Basile; G. Bonvicini; G. Cara Romeo; L. Cifarelli; A. Contin; G. D’Ali; P. Di Cesare; B. Esposito; P. Giusti; T. Massam; R. Nania; F. Palmonari; G. Sartorelli; G. Valenti; A. Zichichi

SummaryEvidence is reported for the existence, with six-standard-deviation significance, of a new particle: the heaviest baryon observed so far, whose mass is measured to bem=(5425−75+175) MeV/c2. Its width is compatible with zero. It is electrically neutral and it decays into a proton, a Do and a π–. This particle is produced in association with a hadronic state whose semi-leptonic decay contains a positive electron. The partial cross-section for the observed effect is Δσ=(3.8±1.2)·10−35 cm2. The interpretation of these results is in terms of the associated production of naked-«beauty» states in (pp) interactions atnn


Physical Review D | 1998

Muon ''depth-intensity'' relation measured by the LVD underground experiment and cosmic-ray muon spectrum at sea level

M. Aglietta; B. Alpat; E. D. Alyea; P. Antonioli; G. Badino; G. Bari; M. Basile; V. S. Berezinsky; F. Bersani; M. Bertaina; R. Bertoni; G. Bonoli; A. Bosco; G. Bruni; G. Cara Romeo; C. Castagnoli; A. Castellina; A. Chiavassa; J. Chinellato; L. Cifarelli; F. Cindolo; G. Conforto; A. Contin; V. L. Dadykin; A. De Silva; M. Deutsch; P. Dominici; L. G. Dos Santos; L. Emaldi; R. I. Enikeev


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1991

The ZEUS vertex detector: Design and prototype test

C. Alvisi; G. Anzivino; F. Arzarello; G. Barbagli; G. Bari; M. Basile; L. Bellagamba; D. Boscherini; G. Bruni; P. Bruni; U. Camerini; G. Cara Romeo; G. Castellini; M. Chiarini; L. Cifarelli; F. Cindolo; F. Ciralli; A. Contin; M. Costa; S. D'Auria; C. Del Papa; S. De Pasquale; F. Fiori; A. Forte; F. Frasconi; P. Giusti; G. Iacobucci; G. Laurenti; B. Lisowski; G. Maccarrone

sqrt 8 = 62 GeV c.m.


Lettere Al Nuovo Cimento | 1981

The transverse-momentum distributions of particles produced in pp reactions and comparison with e+ e−

M. Basile; G. Cara Romeo; L. Cifarelli; A. Contin; G. D'Ali; P. Di Cesare; B. Esposito; P. Giusti; T. Massam; R. Nania; F. Palmonari; G. Sartorelli; M. Spinetti; G. Susinno; G. Valenti; L. Votano; A. Zichichi


Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1981

The «leading»-particle effect in hadron physics

M. Basile; G. Cara Romeo; L. Cifarelli; A. Contin; G. D’Ali; P. Di Cesare; B. Esposito; P. Giusti; T. Massam; R. Nania; F. Palmonari; V. Rossi; G. Sartorelli; M. Spinetti; G. Susinno; G. Valenti; L. Votano; A. Zichichi

nn GeV c.m. energy. The new particle is identified as the first «beauty»-flavoured baryon with quark composition (udb),i.e. the Λb0. The discrimination power of the experiment against «known» physics is of the order of 10−10.


Lettere Al Nuovo Cimento | 1980

Measurements of in and out distributions in high-energy pp interactions

M. Basile; G. Cara Romeo; L. Cifarelli; G. D’Ali; P. Di Cesare; P. Giusti; T. Massam; P. Palmonari; G. Sartorelli; G. Valenti; A. Contin; A. Zichichi; B. Esposito; R. Nania

We present the analysis of the muon events with all muon multiplicities collected during 21804 hours of operation of the first LVD tower. The measured angular distribution of muon intensity has been converted to the `depth -- vertical intensity relation in the depth range from 3 to 12 km w.e.. The analysis of this relation allowed to derive the power index,


Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1980

The fractional momentum distribution in p-p collisions compared with e + e − annihilation

M. Basile; G. Cara Romeo; L. Cifarelli; G. D’Ali; P. Di Cesare; P. Giusti; T. Massam; F. Palmonari; G. Sartorelli; A. Contin; G. Valenti; A. Zichichi; B. Esposito; R. Nania

gamma


Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1981

Measurement of associated charm production in pp interactions at\(\sqrt s = 62 GeV\)

M. Basile; G. Cara Romeo; L. Cifarelli; A. Contin; G. D'Ali; P. Di Cesare; B. Esposito; P. Giusti; T. Massam; R. Nania; F. Palmonari; G. Sartorelli; G. Valenti; A. Zichichi

, of the primary all-nucleon spectrum:


Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1981

Charged-particle multiplicities in pp interactions and comparison with e+e− data

M. Basile; G. Cara Romeo; L. Cifarelli; A. Contin; G. D'Ali; P. Di Cesare; B. Esposito; P. Giusti; T. Massam; R. Nania; F. Palmonari; V. Rossi; G. Sartorelli; M. Spinetti; G. Susinno; G. Valenti; L. Votano; A. Zichichi

gamma=2.78 pm 0.05


Nuovo Cimento Della Societa Italiana Di Fisica A-nuclei Particles and Fields | 1983

Experimental proof that the leading protons are not correlated

M. Basile; G. Bonvicini; G. Cara Romeo; L. Cifarelli; A. Contin; M. Curatolo; G. D’Ali; C. Del Papa; B. Esposito; P. Giusti; T. Massam; R. Nania; F. Palmonari; G. Sartorelli; G. Susinno; L. Votano; A. Zichichi

. The `depth -- vertical intensity relation has been converted to standard rock and the comparison with the data of other experiments has been done. We present also the derived vertical muon spectrum at sea level.

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M. Basile

University of Bologna

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P. Giusti

University of Bologna

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A. Contin

University of Bologna

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L. Cifarelli

University of Santiago de Compostela

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R. Nania

Wayne State University

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