Alberto Ruiz Jimeno

Precision Measurement of the

We present an analysis of the mass of the X(3872) reconstructed via its decay to J/psi pi(+)pi(-) using 2.4 fb(-1) of integrated luminosity from pp collisions at square root(s)=1.96 TeV, collected with the CDF II detector at the Fermilab Tevatron. The possible existence of two nearby mass states is investigated. Within the limits of our experimental resolution the data are consistent with a single state, and having no evidence for two states we set upper limits on the mass difference between two hypothetical states for different assumed ratios of contributions to the observed peak. For equal contributions, the 95% confidence level upper limit on the mass difference is 3.6 MeV/c(2). Under the single-state model the X(3872) mass is measured to be 3871.61+/-0.16(stat)+/-0.19(syst) MeV/c(2), which is the most precise determination to date.

X(3872)

We report the most restrictive direct limits on masses of fourth-generation down-type quarks

Mass in

b^{\prime}

J/\psi \pi^+ \pi^-

, and quark-like composite fermions (

Decays

B

Search for New Bottomlike Quark Pair Decays QQ → (tW∓)(tW∓) in Same-Charge Dilepton Events

or

Observation of the Ωb- baryon and measurement of the properties of the Ξb- and Ωb- baryons

T_{5/3}

Measurement of the Inclusive Jet Cross Section in pp Collisions at √s= 7 TeV

), decaying promptly to

First observation of vector boson pairs in a hadronic final state at the tevatron collider.

t W^{\mp}

Search for anomalous production of events with a photon, jet, b-quark jet, and missing transverse energy

. We search for a significant excess of events with two same-charge leptons (