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Register a new userRecent heavy flavor results from the Tevatron
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Mirco Dorigo
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The CDF and D0 experiments at the Tevatron ppbar collider have pioneered and established the role of flavor physics in hadron collisions. A broad program is now at its full maturity. We report on three new results sensitive to physics beyond the standard model, obtained using the whole CDF dataset: a measurement of the difference of CP asymmetries in $K^+K^-$ and $pi^+pi^-$ decays of $D^0$ mesons, new bounds on the $B^0_s$ mixing phase and on the decay width difference of $B^0_s$ mass-eigenstates, and an update of the summer 2011 search for $B^0_(s)$ mesons decaying into pairs of muons. Finally, the D0 confirmation of the observation of a new hadron, the $chi_b(3P)$ state, is briefly mentioned.
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In these proceedings, we report on the production of various open heavy-flavor hadrons and quarkonia in Au+Au collisions at sNN = 200GeV from the STAR experiment.
In this article, I review recent measurements of the production of the top quark in $pbar p$ collisions at a centre-of-mass energy of $sqrt s=1.96$~TeV in Run II of the Fermilab Tevatron Collider, recorded by the CDF and D0 Collaborations. I will present the Tevatron combination of measurements of the $tbar t$ production cross section and its differential measurement, the first evidence for and observation of the production of single top quarks in the $s$-channel, as well the final Tevatron combination of the production of single top quarks the $s$- and $t$-channels. Furthermore, I will review the measurements of the forward-backward asymmetry in $tbar t$ events, which can be experimentally uniquely accessed in the $CP$-invariant $pbar p$ initial state at the Tevatron, and conclude with the measurements of this asymmetry in the $bbar b$ system.
With the full Tevatron data set collected and being analyzed, many new results have been recently released. This includes heavy flavor physics studies such as CP violation parameter measurements with B^{+/-} -> J/psi K^{+/-} and B^{+/-} -> J/psi pi^{+/-} and $D^0-D^0bar mixing. Of the QCD and electroweak results, photon plus heavy flavor measurements and a search for anomalous quartic gauge couplings will be reviewed. These various studies help to clarify the agreement between data and physics models and to search for new physics.
We present the recent results on non-photonic electron (NPE) yields from RHIC run8 p+p collisions. The $e/pi$ ratio as a function of $p_T$ in run8 with a factor of 10 reduction of the inner detector material at STAR is found to be consistent with those results from run3 taking into account the NPE from charm leptonic decay and the difference of photonic electron yield from photon conversion in detector material. Jpsi spectra in pp and cucu collisions at sNN = 200 GeV with high sampled luminosity Jpsi spectrum at high-pT follows $x_T$ scaling, but the scaling is violated at low pT. $J/psi$-hadron correlations in pp collisions are studied to understand the Jpsi production mechanism at high $p_T$. We observed an absence of charged hadrons accompanying Jpsi on the near-side, in contrast to the strong correlation peak in the di-hadron correlations. This constrains the $B$-meson contribution and jet fragmentation to inclusive Jpsi to be ${}^{<}_{sim}17%$. Yields in minimum-bias cucu collisions are consistent with those in pp collisions scaled by the underlying binary nucleon-nucleon collisions in the measured pT range. Other measurements and future projects related to heavy-flavors are discussed.
We present recent results from the BES experiment on the observation of the Y(2175) in $J/psito phi f_0(980) eta$, and $eta(2225)$ in $J/psito gamma phi phi$, and X(1440) in $J/psi$ hadronic decays, together with the new observation of $psi(2S)$ radiative decays and hadronic decays into $nksldb+c.c., ldldbpi^0, ldldbeta$. The effort to search for $J/psi$ decays into $gammagamma$ and invisible decays are also reported.
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