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| Release | : 2005 |
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If quarks are composite particles then excited states are expected. We have searched in p[bar p] collisions for excited quarks (q*) which decay to common quarks by emitting a W boson (q* [yields] qW) or a photon (q* [yields] q[gamma]). The simplest model of excited quarks has been excluded for mass M*
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| Total Pages | : 12 |
| Release | : 1993 |
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If quarks are composite particles then excited states are expected in p{bar p} collisions. Using the CDF detector we have searched for excited quarks (q*) which decay to common quarks by emitting a W boson (q* → qW) or a photon (q* → q-?). In the W + jet and photon + jet mass spectra we see no compelling evidence for a q* mass resonance. We set an upper limit on the q* cross section vs. mass, and using the simplest model of excited quark production, we exclude excited quarks in the mass range 90
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| Total Pages | : 602 |
| Release | : 1995 |
| Genre | : Aeronautics |
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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| Release | : 2001 |
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The authors present measurements of the b[bar b] production cross section and angular correlations between the b and[bar b]-quarks in p[bar p] collisions using the D0 detector at the Fermilab Tevatron operating at[radical]s= 1.8 TeV. The b-quark production cross section for[vert-bar]y[sup b][vert-bar]1.0 and[rho][sub[tau]][sup b] 8 GeV/c is extracted and found to be consistent with next-to-leading order QCD predictions. In addition, the angular correlations between the b and[bar b]-quarks are found to agree in shape with next-to-leading order QCD predictions.
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| Total Pages | : 6 |
| Release | : 1992 |
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Inclusive J/[psi] and [psi](2S) production has been studied in p[bar p] collisions at [radical]s = 1.8 TeV with the Collider Detector at Fermilab. The products of production cross section times the branching fraction of J/[psi]([psi](2S)) to [mu][sup +][mu][sup [minus]] are reported as functions of the J/[psi]([psi](2S)) P[sub T] in the kinematic range P[sub T]> 6 GeV/c and [vert bar][eta][vert bar] [le] 0.5. The products of the integrated cross section times branching fraction and the b-quark production cross section calculated from these values are also reported.
