We report the first observation of diffractively produced W bosons. In a sample of W --> e nu events produced in <p(p)over bar> collisions at root s = 1.8 TeV, we find an excess of events with a forward rapidity gap, which is attributed to diffraction. The probability that this excess is consistent with nondiffractive production is 1.1 x 10(-4) (3.8 sigma). The relatively low fraction of W + jet events observed within this excess implies that mainly quarks from the Pomeron, which mediates diffraction, participate in W production. The diffractive to nondiffractive W production ratio is found to be R(W) = (1.15 +/- 0.55)%. RI Vucinic, Dejan/C-2406-2008; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevLett.78.2698 |
Codice identificativo ISI: | WOS:A1997WR91500005 |
Codice identificativo Scopus: | 2-s2.0-0000515450 |
Handle: | http://hdl.handle.net/11695/6660 |
Abstract: | We report the first observation of diffractively produced W bosons. In a sample of W --> e nu events produced in <p(p)over bar> collisions at root s = 1.8 TeV, we find an excess of events with a forward rapidity gap, which is attributed to diffraction. The probability that this excess is consistent with nondiffractive production is 1.1 x 10(-4) (3.8 sigma). The relatively low fraction of W + jet events observed within this excess implies that mainly quarks from the Pomeron, which mediates diffraction, participate in W production. The diffractive to nondiffractive W production ratio is found to be R(W) = (1.15 +/- 0.55)%. RI Vucinic, Dejan/C-2406-2008; Chiarelli, Giorgio/E-8953-2012; Azzi, Patrizia/H-5404-2012 |
Titolo: | Observation of diffractive W-boson production at the Fermilab tevatron |
Autori: | |
Appare nelle tipologie: | 1.1 Articolo in rivista |