@article{7295f73314874377b8298902fcf24030,

title = "Intermediate vector boson cross sections at the CERN super proton synchrotron collider and the number of neutrino types",

abstract = "We present updated results from the UA1 experiment on cross sections times leptonic branching ratios for intermediate vector bosons produced in proton-antiproton collisions at a centre-of-mass energy of 0.630 TeV. We find that σ·B(W→lβn)=0.63±0.04±0.10 nb and σ·B(Z0→l+l-=0.071 ±0.011 nb where l denotes an average of electron and muon channels. An average over all data (electron and muon channels at 0.546 and 0.630 TeV) gives a ratio of R≡σ·(W→lν)/σ·B(Z0 →l+l-) = 9.1+1.7-1.2. Using current theoretical predictions for this quantity, limits are extracted on the number of light neutrino types. Combining UA1 and UA2 data and imposing the bound Nν≥3 we find that Nν≤5.9 at 90{\%} CL. Constraints on the mass of the top quark are also discussed.",

keywords = "CERN collider, UA1 experiment",

author = "{UA1 Collaboration} and C. Albajar and Albrow, {M. G.} and Allkofer, {O. C.} and A. Astbury and B. Aubert and T. Axon and C. Bacci and T. Bacon and N. Bains and Batley, {J. R.} and G. Bauer and S. Beingessner and J. Bellinger and A. Bettini and A. Bezaguet and R. Bonino and K. Bos and E. Buckley and G. Busetto and P. Catz and P. Cennini and S. Centro and F. Ceradini and Charlton, {D. G.} and G. Ciapetti and S. Cittolin and D. Clarke and D. Cline and C. Cochet and J. Colas and P. Colas and M. Corden and Coughlan, {J. A.} and G. Cox and D. Dau and M. Debeer and Debrion, {J. P.} and M. Degiorgi and {Della Negra}, M. and M. Demoulin and B. Denby and D. Denegri and A. Diciaccio and {Diez Hedo}, {F. J.} and L. Dobrzynski and J. Dorenbosch and Dowell, {J. D.} and E. Duchovni and R. Edgecock and K. Eggert",

year = "1987",

month = "11",

day = "19",

doi = "10.1016/0370-2693(87)91510-3",

language = "English",

volume = "198",

pages = "271--280",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "2",

}