Massive stars exploding in a He-rich circumstellar medium III. SN 2006jc: IR echoes from new and old dust in the progenitor CSM
(2008)
Search for Bs0→μ+μ- and B0→μ+μ- decays with 2fb-1 of pp̄ collisions
Physical Review Letters 100:10 (2008)
Abstract:
We have performed a search for Bs0→μ+μ- and B0→μ+μ- decays in pp̄ collisions at s=1.96TeV using 2fb-1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron Collider. The observed number of Bs0 and B0 candidates is consistent with background expectations. The resulting upper limits on the branching fractions are B(Bs0→μ+μ-) <5.8×10-8 and B(B0→μ+μ-)<1.8×10-8 at 95% C.L. © 2008 The American Physical Society.Limits on the production of narrow tt̄ resonances in pp̄ collisions at s=1.96TeV
Physical Review D - Particles, Fields, Gravitation and Cosmology 77:5 (2008)
Abstract:
We search for evidence of resonant top quark pair production in 955 pb-1 of pp̄ collisions at s=1.96TeV recorded with the CDF II detector at the Fermilab Tevatron. For fully reconstructed candidate tt̄ events triggered on leptons with large transverse momentum and containing at least one identified b-quark jet, we compare the invariant mass spectrum of tt̄ pairs to the expected superposition of standard model tt̄, non-tt̄ backgrounds, and a simple resonance model based on a sequential Z′ boson. We establish upper limits for σ(pp̄→Z′) ·Br(Z′→tt̄) in the Z′ mass interval from 450GeV/c2 to 900GeV/c2. A topcolor leptophobic Z′ is ruled out below 720GeV/c2, and the cross section of any narrow Z′-like state decaying to tt̄ is found to be less than 0.64 pb at 95% C.L. for MZ′ above 700GeV/c2. © 2008 The American Physical Society.Multiwavelength observations of the black hole candidate Swift J1753.5-0127
(2008)
Simultaneous X-ray/radio observations of Cir X-1
(2008)