Ahmed Ali
(DESY),
Diego Tonelli
(Fermilab),
Leonid Gladilin
(Moscow State University)
27/04/2009, 09:00
Hubert Spiesberger
(Mainz)
27/04/2009, 09:05
I discuss the inclusive production of D* mesons in photon-proton collisions at DESY HERA, based on a calculation at next-to-leading order in the general-mass variable-flavor-number scheme. In this approach, MSbar subtraction is applied in such a way that large logarithmic corrections are resummed in universal parton distribution and fragmentation functions and finite mass terms are taken into...
Silvia Miglioranzi
(CERN)
27/04/2009, 09:25
Photoproduction of b quarks in dijet events has been measured with the ZEUS detector at HERA. The large mass of the beauty quark and its long lifetime were exploited in order to separate the beauty signal from background, making use of the microvertex detector to determine the distance of the beauty decay products from the primary event vertex. Differential cross sections were measured and...
Benno List
(University of Hamburg)
27/04/2009, 09:45
The photoproduction of beauty quarks in ep collisions has been measured using a data sample of 170 pb-1 collected with the H1 detector at HERA-II in the years 2006 and 2007. Beauty photoproduction events are investigated with two jets and a muon in the final state. Visible cross sections are measured differentially in the transverse momenta of the highest energy jet and the muon, in the...
Jeremy Andrea
(ULP/IPHC (Strasbourg))
27/04/2009, 10:25
We present expected sensitivities for b hadron production in pp collisions using the CMS detector at the LHC.
Pierre Artoisenet
(Univerite catholique de Louvain)
27/04/2009, 11:15
In this talk, I review the photo-production of J/psi states at HERA. In the framework of NRQCD, I present the various components expected to contribute to the J/psi yield at HERA, and their importance in different regions of the phase space. I compare the predicted differential cross sections with the data collected by the ZEUS and H1 collaborations. I then move on the polarization observables...
Alessandro Bertolin
(Padova)
27/04/2009, 11:40
The decay angular distributions for inelastic photoproduction of J/psi mesons have been measured with the ZEUS detector at HERA, using an integrated luminosity of 468 pb-1. J/psi mesons were identified using their decays into muons. The polar and azimuthal distributions of the mu+ in the J/psi rest frame have been measured as a function of pT and as function of z, where pT is the transverse...
Nikolay ZOTOV
(SINP, Moscow State University)
27/04/2009, 12:00
In the framework of the k_T-factorization approach, the production and polarization of the Upsilon mesons at the Tevatron is considered and a comparison of the calculated double differential distributions and the spin alignment parameter alpha with the D0 experimental data is shown. We argue that measuring the double differential cross section and the polarization of the upsilonium states can...
Pietro Faccioli
(Dipartimento di Fisica - Universita degli Studi di Bologna)
27/04/2009, 12:25
The determination of the magnitude and "sign" of the J/psi polarization crucially depends on the reference frame used in the analysis of the data and a full understanding of the polarization phenomenon requires measurements reported in two "orthogonal" frames, such as the Collins-Soper and helicity frames. Moreover, the azimuthal anisotropy can be, in certain frames, as significant as the...
Antonio Polosa
(INFN Roma 1 "La Sapienza")
27/04/2009, 15:00
I will review the main debated issues on the nature of the new hadrons. Both the molecular and four-quark pictures are being challenged by data and the field still presents several open questions.
Kai Yi
(Physics and Astronomy Department-University of Iowa)
27/04/2009, 15:20
CDF reports the recent evidence for a new narrow resonance, Y(4140), decaying to J/psi phi final state, and reconstructed using 2.7 fb-1 of exclusive B+->J/psiphiK decays. Using the world's largest sample of X(3872)->J/psipipi decays, a study on the X(3872) mass and width aimed at testing the internal composition of this state is also described. This lead to the most precise X(3872) mass...
Thomas Kuhr
(University of Karlsruhe)
27/04/2009, 15:40
Since the unexpected discovery of the X(3872) in 2003 the list of new charmonium-like states observed at B-factories keeps growing. BaBar and Belle have measured many properties, like masses, widths and quantum numbers of these states. The recent measurements are presented in this talk. Despite the progress on experimental and theoretical side a consistent picture explaining all states has not emerged.
Jiangchuan Chen
(IHEP, Beijing)
27/04/2009, 16:00
We present the latest results on the production and decays of psi(3770) and decays of open charm from BESII and CLEO-c experiments. BES observed anomalous line shape of cross sections for e+e- --> hadrons between 3.65 3.872 GeV and also measured line shapes of DD-bar production and the ratio of the production rates of D+D- and D0D0-bar at psi(3770) resonance. CLEO-c measured Ds decay constants...
Bernd Kniehl
(University of Hamburg)
27/04/2009, 17:15
We advocate charmed-hadron inclusive hadroproduction as a laboratory to probe intrinsic charm (IC) inside the colliding hadrons. Working at next-to-leading order in the general-mass variable-flavor-number scheme endowed with non-perturbative fragmentation functions recently extracted from a global fit to e^+e^- annihilation data from KEKB, CESR, and LEP1, we first assess the sensitivity of...
Raphael Granier de Cassagnac
(CNRS/IN2P3)
27/04/2009, 17:45
Recent PHENIX results on heavy flavor production in p+p and d+Au collisions at sqrt(s_NN) = 200 GeV will be presented. Quarkonia results include measured yields of J/psi and psi' as well as J/psi polarization versus transverse momentum in p+p collisions. High statistics J/psi yields versus rapidity and transverse momentum measured in d+Au collisions and their constraints on cold nuclear matter...
Jaroslav Bielcik
(NPI, Praque)
27/04/2009, 18:05
We present a summary of the heavy flavor results from the STAR experiment. The study of heavy quark production in heavy ion collisions has been of interest in recent years because i) Heavy flavor decay electron production has been observed to be suppressed as much as light hadrons in the medium in contradiction with theoretical expectations and ii) the production of heavy quark bound states...
Giuseppe Bruno
(University and INFN, Bari, Italy)
27/04/2009, 18:25
The ALICE experiment, currently in the commissioning phase, will study nucleus--nucleus and proton--proton collisions at the CERN Large Hadron Collider (LHC). We review the ALICE heavy-flavour physics program and present a selection of results on the expected performance.
Leonid Gladilin
(Moscow State University)
27/04/2009, 18:45
The charm fragmentation function has been measured in D* photoproduction with the ZEUS detector at HERA. The fragmentation function has been measured versus z, the ratio of E+p_parallel for the D* meson and that for the associated jet, where E is the energy and p_parallel the longitudinal momentum relative to the jet axis. The measured function is compared to different fragmentation models...
Ulrich Langenfeld
(Zeuthen)
28/04/2009, 11:15
We present new predictions for the total cross section of $t \bar{t}$ at the Tevatron and the LHC through next-to-next-to-leading order. The results are based on the numerically dominant soft corrections. They are exact in all logarithmically enhanced terms near threshold, include the Coulomb corrections at two loops and exact scale dependence. We investigate the scale dependence as well as...
Gervasio Gomez
(Instituto de Fรญsica de Cantabria)
28/04/2009, 11:40
With the large data samples collected at the Tevatron, top quark physics has entered the realm of precision. We present here the latest results on top pair production cross section at CDF, which uncertainties are comparable to those of the theory prediction. The exciting results on the challenging channel of the electroweak production will also be shown.
Jiri Kvita
(Faculty of Mathematics and Physics, Charles University)
28/04/2009, 12:05
We report on measurements of the ttbar production cross section at a center-of-mass energy of 1.96 TeV at the D0 experiment during Run II of the Fermilab Tevatron collider. We use candidate events in lepton+jets and dilepton final states. In the most sensitive channel (lepton+jets channel), a neural network algorithm that uses lifetime information to identify b-quark jets is used to...
Konstantin Toms
(University of New Mexico)
28/04/2009, 12:30
The LHC experiments will perform sensitive tests of physics phenomena beyond the Standard Model (BSM). Investigation of decays of beauty hadrons represents an alternative approach in addition to direct BSM searches. The ATLAS efforts concentrate on those B decays that can be selected already at the first and second trigger levels.
The most favorable trigger signature will be for B hadrons...
Serguei Alekhin
(State Res.Center of Russian Feder. Inst.f.High Energy Phys. (IFVE))
28/04/2009, 15:00
We perform QCD fit of parton distribution functions (PDFs) based on the existing inclusive DIS data supplemented by the Drell-Yan ones. The DIS heavy-quark contribution is calculated in the variable-flavour-number (VFN) scheme with the heavy-quark PDFs generated from ones of the fixed-flavour-number (FFN) scheme using the matching conditions by Buza-Matiounine-Smith-van Neerven. Comparison to...
Philipp Roloff
(Deutsches Elektronen-Synchrotron (DESY))
28/04/2009, 16:00
Charm production has been measured in the deep inelastic scattering regime with the ZEUS detector at HERA. Charm was reconstructed by identifying charmed mesons (D*, D+, D0) in the final state, or through its decay into muons. Differential cross sections were measured and compared to next-to-leading order QCD predictions. The charm contribution to the proton structure function F2, F2cc, was...
Martin Brinkmann
(University of Hamburg)
28/04/2009, 16:20
Inclusive production of D*+- -mesons in deep inelastic scattering at HERA is studied at high photon virtualities Q2>100 GeV^2 for the first time with the H1 experiment. The data were collected during the years 2004-2007 and correspond to an integrated luminosity of 351 pb^-1. D*-mesons are reconstructed in their decays D*+- -> D0+ pi_slow+- -> K-+ pi+- pi_slow+-. The visible range for the...
Pavel Nadolsky
(Southern Methodist University)
28/04/2009, 17:15
The zero-mass (ZM) parton formalism is widely used in high-energy physics because of its simplicity and historical importance, even while the latest global QCD analyses are carried out in the more precise general-mass (GM) QCD formalism. We explore the possibility of rectifying obvious kinematical inconsistencies of the conventional implementation of the ZM formalism, while preserving the...
Paul Daniel Thompson
(Birmingham)
28/04/2009, 17:55
The inclusive charm and beauty cross sections are measured in e-p and e+p collisions at HERA II in the kinematic region of photon virtuality 5 < Q2 < 650 GeV^2 and Bjorken scaling variable 0.0002 < x < 0.032. The data were collected with the H1 detector in 2006 and 2007 corresponding to an integrated luminosity of 189 pb^-1. The charm and beauty fractions are determined using a neural network...
Marcello Bindi
(Universita & INFN, Bologna)
28/04/2009, 18:25
Beauty production has been measured in the deep inelastic scattering regime with the ZEUS detector at HERA. Beauty was reconstructed using its semi-leptonic decay into muons. The beauty signal was separated from the background using lifetime information and the transverse momentum of the muon with respect to the axis of the jet coming from the hadronisation of the b quark, ptrel. Differential...
Marek Karliner
(Tel-Aviv)
29/04/2009, 09:00
I discuss several recent highly accurate theoretical predictions for masses of baryons containing the b quark, as well as an effective supersymmetry between heavy quark baryons and mesons. I also suggest some possibilities for observing exotic hadrons containing heavy quarks.
Juan Pablo Fernandez
(CIEMAT)
29/04/2009, 09:30
We present recent CDF results on the properties of hadrons containing heavy quarks. These include a new measurement of the Bc production rate and updated measurement of Bs and Lambda_b lifetimes.
Matthew David Needham
(EPFL)
29/04/2009, 09:50
We report on the possibilities of measuring charmonia and bottom production with the LHCb experiment. Using reconstructed J/psi decays to mu+ mu-, both the prompt J/psi and b -> J/psi production cross-sections in pp collisions at LHC energies will be determined in the J/psi eta range 2-5. Due to the very large statistics, this analysis will be possible very early after the LHC start. Other...
James Pinfold
(University of Alberta)
29/04/2009, 10:10
We present the study of the exclusive production of charmonia via the reactions p + pbar --> p + X + p with X being a centrally produced J/psi, psi(2s) or chi_c, using 1.48 fb-1 of proton-antiproton collision data collected by the Run-II Collider Detector at Fermilab at sqrt(s)=1.96 TeV
Jibo He
(Laboratoire de l'Accรฉlรฉrateur Linรฉaire (LAL))
29/04/2009, 10:30
The Bc mass and lifetime measurements using the exclusive decay Bc->Jpsi pi at the LHCb experiment were studied. About 310 signal events are expected for a data set which corresponds to an integrated luminosity of 1 fb-1, with a B/S ratio around 2. Based on these data, the Bc mass and lifetime can be measured with expected statistical errors below 2 MeV/c^2 and 30 fs, respectively.
Carlos Lourenco
(CERN)
29/04/2009, 11:35
We present expected sensitivities for the measurement of the charmonium production cross section in pp collisions using the CMS detector at the LHC. The analysis is performed on a Monte Carlo sample simulating expected conditions for early data, and includes lifetime information to separate prompt and non-prompt J/psi production.
Peter Ratoff
(Lancaster University, UK)
29/04/2009, 11:55
Although predicted by the quark model only a few of the B baryons predicted had been observed. D0 set out to search for two of those predicted, the Cascade_b and the Omega_b. The Cascade_b was observed in 2007 and the Omega_b in 2008. The search and observation was possible thanks to the reprocessing of events that include J/psi in such a way that the efficiency to reconstruct low pT charged...
Thorsten Stahl
(University of Siegen)
29/04/2009, 12:15
ATLAS prepared a program for measurements of production cross sections both of b-hadrons and Onia in central proton-proton collisions at new energy 14 TeV of LHC.
Dedicated triggers based on muon, di-muon or electron signatures are designed to accommodate large statistics with already first several months. Starting from semi-inclusive measurements for very early stage exclusive channels...
