Single hadron response measurement and calorimeter jet energy scale uncertainty with the ATLAS detector at the LHC
The uncertainty on the calorimeter energy response to jets of particles is derived for the ATLAS experiment at the Large Hadron Collider (LHC). First, the calorimeter response to single isolated charged hadrons is measured and compared to the Monte Carlo simulation using proton-proton collisions at centre-of-mass energies of $\sqrt{s} = 900~\mbox{GeV}$ and 7 TeV collected during 2009 and 2010. Then, using the decay of Ks and Λ particles, the calorimeter response to specific types of particles (positively and negatively charged pions, protons, and anti-protons) is measured and compared to the Monte Carlo predictions. Finally, the jet energy scale uncertainty is determined by propagating the response uncertainty for single charged and neutral particles to jets. The response uncertainty is 2–5 % for central isolated hadrons and 1–3 % for the final calorimeter jet energy scale.

title: Measurement of moments of the hadronic-mass and energy spectrum in inclusive semileptonic anti-B ---> X(c) l- anti-nu decays

title: Investigation of $B \to D^{(*)} \bar{D}$( *) $K$ decays with the BaBar detector

title: Evidence for the $B^0 \to \rho^0 \rho^0$ decay and implications for the CKM angle $\alpha$
abstract: We search for the decays B0->rho0rho0, B0->rho0f0, and B0->f0f0 in a sample of about 348 million Upsilon(4S)->BBbar decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We find evidence for B0->rho0rho0 with 3.0 sigma significance and measure the branching fraction B = (1.16 +0.37-0.36 +-0.27) 10^{-6} and longitudinal polarization fraction f_L = 0.86 +0.11-0.13 +-0.05. As a consequence, the uncertainty on the CKM unitarity angle alpha due to penguin contributions in B->rhorho decays is estimated to be 18 degrees at 1 sigma level. We also set upper limits on the B0->rho0f0 and B0->f0f0 decay rates. All results are preliminary.

title: Measurement of $\cos_{2beta}$ in $B^0 \to D^{(*)}$ 0 h0 decays with a time-dependent Dalitz plot analysis of $D^0 \to K^0_{s} \pi^{+} \pi^{-}$
abstract: We report a preliminary measurement of $\cos2\beta$ in $B^0\to D^{(*)0}h^0$ decays with a time-dependent Dalitz plot analysis of $D^0\to K_S\pi^+\pi^-$, where $h^0$ is a light neutral meson such as $\pi^0$, $\eta$, $\eta'$ or $\omega$. The strong phase variation on the Dalitz plot allows the access to the angle $\beta$ with only a two-fold ambiguity ($\beta+\pi$). Using $311\times 10^{6}$ $B\bar{B}$ pairs collected at the Babar detector, we obtain $\cos2\beta = 0.54 \pm 0.54 \pm 0.08 \pm 0.18$, $\sin2\beta = 0.45 \pm 0.36 \pm 0.05 \pm 0.07$, and $|\lambda| = 0.975^{+0.093}_{-0.085} \pm 0.012 \pm 0.002 $, where the first errors are statistical, the second are experimental systematic uncertainties, and the third are the signal Dalitz model uncertainties. This measurement favors the solution of $\beta= 22^\circ$ over $68^\circ$ at an 87% confidence level.

title: The ATLAS High Level Trigger Steering
abstract: The High Level Trigger (HLT) of the ATLAS experiment at the Large Hadron Collider receives events which pass the LVL1 trigger at ~75 kHz and has to reduce the rate to ~200 Hz while retaining the most interesting physics. It is a software trigger and performs the reduction in two stages: the LVL2 trigger and the Event Filter (EF). At the heart of the HLT is the Steering software. To minimise processing time and data transfers it implements the novel event selection strategies of seeded, step-wise reconstruction and early rejection. The HLT is seeded by regions of interest identified at LVL1. These and the static configuration determine which algorithms are run to reconstruct event data and test the validity of trigger signatures. The decision to reject the event or continue is based on the valid signatures, taking into account pre-scale and pass-through. After the EF, event classification tags are assigned for streaming purposes. Several powerful new features for commissioning and operation have been added: comprehensive monitoring is now built in to the framework; for validation and debugging, reconstructed data can be written out; the steering is integrated with the new configuration (presented separately), and topological and global triggers have been added. This paper will present details of the final design and its implementation, the principles behind it, and the requirements and constraints it is subject to. The experience gained from technical runs with realistic trigger menus will be described.

title: Results from the Beijing Spectrometer III
abstract: The new BES III detector at BEPCII collected 106 million ψ and about 226 million J/ψ events in 2009. Results based on these samples are reported, including branching ratios for χXcJ → π0π0,ηη, 4π0, γyV and VV, where V is a ρ, ω, or Φ as well as first measurements of the branching ratios for ψ → γ0hc and hc → γηc and measurements of the mass and width of the hc. Results in hadron spectroscopy include the confirmation of the pp threshold enhancement in J/ψ→γpp and confirmation of the X(1835) in J/ψ→γηπ+π−

title: Measurement of diffractive Φ meson photoproduction at HERA with the H1 fast track trigger
abstract: A new measurement of diffractive φ meson photoproduction is performed with the H1 experiment at the electron-proton collider HERA. In the kinematic range 30 < Wγp < 90 GeV and 0.2 < |t| < 1.5 GeV, cross sections are determined double differentially in Wγp and t. From these data, the pomeron trajectory in elastic φ meson photoproduction is determined to be α(t) = 1.15 ± 0.05(stat. A combined fit with data from fixed target experiments and the ZEUS collaboration yields the most precise trajectory measurement using φ mesons to date, α(t) = 1.122 ± 0.008 + t · (0.150 ± 0.017) GeV. The spin density matrix elements, which provide information on the helicity structure of the interaction, are extracted using measurements of angular distributions of the φ meson decay products and are found to be in agreement with expectations from s-channel helicity conservation. The presented cross section measurement was made possible by the Fast Track Trigger (FTT). This new trigger based on signals from selected wire layers of the H1 central drift chamber provides information to the first three trigger levels of the H1 experiment. The first level performs a coarse two-dimensional track reconstruction within 2 μs, whilst the second trigger level reconstructs the event vertex along the beam line, performs a precise three-dimensional track fit and determines invariant masses of track pairs in 20 μs. The third trigger level reconstructs final states from up to 48 tracks and allows for particle identification using information from the calorimeter and the muon system within 100 μs. Zusammenfassung Mit dem H1-Experiment am Elektron-Proton-Beschleuniger HERA wird eine neue Messung diffraktiver φ-Meson-Photoproduktion durchgeführt. Im kinematischen Bereich 30 < Wγp < 90 GeV und 0.2 < |t| < 1.5 GeV werden Wirkungsquerschnitte doppeltdifferenziell in Wγp und t gemessen. Aus diesen Daten bestimmt sich die PomeronTrajektorie in elastischer φ-Meson-Photoproduktion zu α(t) = 1.15 ± 0.05(stat. Eine gemeinsame Anpassung mit Daten von Experimenten mit ruhendem Target und der ZEUS-Kollaboration liefert die bisher genaueste Messung der Trajektorie mit Hilfe von φ-Mesonen: α(t) = 1.122 ± 0.008 + t · (0.150 ± 0.017) GeV. Aus der Messung der Winkelverteilung der φ-Meson-Zerfallsprodukte werden drei Elemente der Spindichtematrix bestimmt. Diese sind verträglich mit s-Kanal-Helizitätserhaltung. Die vorliegende Messung wurde durch den schnellen Spurtrigger (Fast Track Trigger, FTT) ermöglicht. Dieser neue Trigger leitet aus Signalen von ausgewählten Drahtlagen der zentralen Spurkammer von H1 Informationen für die ersten drei Triggerstufen des H1 Experimentes ab. Auf der ersten Stufe wird innert 2 μs eine grobe, zweidimensionale Spurrekonstruktion durchgeführt. In 20 μs rekonstruiert die zweite Stufe den EreignisVertex entlang der Strahllinie, führt eine präzise, dreidimensionale Spuranpassung durch und bestimmt die invariante Masse von Spurpaaren. Auf der dritten Stufe werden innert 100 μs aus bis zu 48 Spuren Endzustände rekonstruiert und mit Hilfe von Informationen aus dem Kalorimeter und dem Myon-System Teilchen identifiziert.

title: Studies of e+e− Collisions with a Hard Initial‐State Photon at BaBar
abstract: We present preliminary BaBar measurements of hadronic cross sections in e+e- annihilation using the radiative return technique. The cross sections for e+e- {yields} pp-bar, 3({pi}+{pi}-), 2({pi}+{pi}-)2{pi}0, and K+K-2({pi}+{pi}-) are measured. Measurements of the proton form factor and of the ratio GE/GM are also shown.