The 2009 Europhysics Conference on High Energy Physics

The KLOE experiment has collected 2.5 fb-1 at the peak of the phi resonance at the e+e- collider DAPHNE in Frascati. The whole data set includes 100 million eta's produced through the radiative decay phi --> eta gamma and tagged by means of the monochromatic recoil photon. With this sample, we are studying eta rare decays. We have a final result for the BR measurement of the eta -->...

We report on the most debated issues which experimentation at the phi factory can really shed light on with a short-term program of measurements. Recent, very promising improvements in the lattice-QCD calculations call for new precision measurements in the Kaon sector to obtain more stringent results on CKM Unitarity and Lepton Flavour Universality. Neutral Kaon Interferometry can probe...

The NA48/2 experiment was originally constructed to measure CP violation in charged kaon sector, using simultaneous positive and negative kaon beams. Several charged kaon decay modes have been collected during two years of data taking. The kaon system is a unique laboratory in which study the dynamics of the QCD in low energy regime, with high statistics and precision. The pi-pi...

(HARP Collaboration ) Measurements of the double differential charged pion cross sections from incident pions, protons in the momentum range 3-12 GeV/c on thin nuclear targets (Be, N2, O2, Al, Cu, Sn, Ta, Pb) are presented. Results are compared with the GEANT4 and MARS MonteCarlo generators.

We study some properties of light-cone distribution amplitudes of B-mesons, which are a key ingredient for factorisation approaches for B-meson decays. We determine how two-parton distribution amplitudes mix with three-parton ones at one loop: \phi_+ is shown to mix only into itself, whereas \phi_- mixes with the difference of three-parton distribution amplitudes \Psi_A-\Psi_V. We determine...

Two-photon processes produced at e+e- colliders via the reaction e+ e- --> e+ e- gamma gamma(*) --> e+ e- X, provide important experimental data for the study of hadronic spectra and testing QCD predictions. We report here on recent results in a number of these channels that are obtained at the PEP-II collider with the BABAR detector. The gamma gamma --> pi0pi0, pi0eta, and etaeta cross...

Several charmonium-like states above $D\bar{D}$ threshold have been discovered at the Belle and BABAR B-factories. Some are produced via Initial State Radiation ({\it e.g.} $Y(4260)$ and $Y(4350)$) and some are observed in $B$ meson decays ({\it{e.g.}} $X(3872)$, $Y(3940)$. The Belle observations of the $Z(4430)^-$, $Z(4050)^-$, and $Z(4248)^-$ states have generated much interest, since...

From a Dalitz plot analysis of $B \to K \pi^+ \psi'$ decays, we find a signal for $Z(4430)^+ \to \pi^+ \psi'$ with a mass $M = (4442^{+15}_{-12}{}^{+19}_{-13})$MeV/$c^2$, width $\Gamma = (107^{+86}_{-43}{}^{+74}_{-56})$ MeV, product branching fraction $\mathcal{B}(\bar{B}^0 \to K^- Z(4430)^+) \times \mathcal{B}(Z(4430)^+ \to \pi^+ \psi') = (3.2^{+1.8}_{-0.9}{}^{+5.3}_{-1.6}) \times 10^{-5}$,...

Precise measurements of hadron production on nuclear targets are vital for the design of a future neutrino factory and important for the tuning of hadron generators such as Geant4. The hadron yield must be known as a function of the energy and the production angle of the secondary particles. We report on HARP-CDP measurements of double-differential inclusive cross-sections of pion, proton and...

The differential cross section for the process $\gamma \gamma \to \eta \pi^0$ has been measured in the kinematic range 0.84 GeV $< W <$ 4.0 GeV, $|\cos \theta^*| < 0.8$, where W and $\theta^*$ are the energy and $\pi^0$ (or $\eta$) scattering angle, respectively, in the $\gamma-\gamma$ center-of-mass system. The results are based on a 223 fb$^{-1}$ data sample collected with the Belle detector...

The $\Upsilon$(5S) decays to channels with $B^+$ and $B^0$ mesons are studied using a 23.6 fb~$^{-1}$ data sample collected on the $\Upsilon$ (5S) resonance with the Belle detector at the KEKB asymmetric energy $e^+ e^-$ collider. Using fully reconstructed $B$ mesons, we measure the total $B^+$ and $B^0$ production rates per $b\bar{b}$ event and the two-body, three-body and four-body...

I will summarize selected studies in bottomonium physics carried out by the BaBar experiment, including bottomonium decays to open charm, the study of chi_bJ(1P) radiative decays, and the search for the eta_b in hadronic transitions.

We report on a search for the $X(1812)$ state in the decay $B^\pm \to K^\pm \omega \phi$ with a data sample of $657\times 10^6$ $B\bar{B}$ pairs collected with the Belle detector at the KEKB $e^+e^-$ collider. No significant signal is observed. An upper limit ${\cal B}(B^\pm \to K^\pm X(1812)$, $X(1812) \to \omega \phi) < 3.2\times 10^{-7}$ (90\% C.L.) is determined. We also constrain the...

The quark-antiquark potential obtained in a gauge/gravity (AdS/QCD) approach is inserted in a Salpeter equation to determine heavy hadron masses. The parameters of the model are fixed fitting the known spectrum of the $S$-wave mesons in the sector of heavy-light quarks, charmonium and bottomonium. The predicted mass of $\eta_b$ is in agreement with the subsequent observation by BaBar...

It is common to use the Heavy Meson Chiral Perturbation Theory to modelise the transitions involving heavy mesons and soft pions. The corresponding effective Lagrangian has few couplings: one of them is g_B*Bpi parameterising the transition between B, B* and a soft pion. As the process B* --> B pi is forbidden kinematically, the coupling is not accessible to experiment and has to be determined...

The production of strange hadrons is investigated using deep-inelastic scattering events measured with the H1 detector at HERA. The measurements of K_s and Lambda production are performed in two regions of phase space defined by the negative four-momentum transfer squared of the photon Q^2. The K_s and Lambda production cross sections and their ratios are determined and presented...

We present the plans of the CMS collaboration to measure cross sections and differential yields of charged particles (unidentified or identified pions, kaons and protons) produced in inelastic proton-proton collisions at center-of-mass energy of 14 TeV. The measurements of these basic observables could also serve as an important tool for calibrating and understanding the CMS detector at...