EPS HEP 2013 Stockholm

Session

QCD

18 Jul 2013, 09:00

KTH and Stockholm University Campus

488. PDF and alphaS constraints from jet measurements at CMS

Dr Panos Kokkas (University of Ioannina (GR))

18/07/2013, 09:00

QCD

Talk presentation

We present CMS results related to constraints on parton distribution functions and the strong coupling constant. Results include recent jet measurements performed with 2011 data taken at center-of-mass energy of 7 TeV and 2012 data taken at 8 TeV, including alphaS constraints from multijet events and PDF+alphaS constraints from jet production cross sections.

88. Strong coupling from the tau-lepton hadronic width

gauhar abbas (IMSc Chennai, India)

18/07/2013, 09:15

QCD

Talk presentation

We determine the strong coupling constant ${\alpha }_s$ from the $\tau$ hadronic width using renormalization group summed expansion of the QCD Adler function. The main theoretical uncertainty in the extraction of ${\alpha }_s$ is due to the way in which renormalization group invariance is implemented and the yet uncalculated higher order terms in the QCD perturbative series. We show that new...

454. Multi-jet cross section ratios and a determination of the strong coupling constant in ppbar collisions at sqrt(s)=1.96 TeV

Avtandyl Kharchilava

18/07/2013, 09:30

QCD

Talk presentation

We present measurements of three different multi-jet cross section ratios. These include the very first measurements of the new quantities $\text{Undefined control sequence DeltaR}$ and $R_{\mathrm{\Delta }\varphi }$, and a measurement of $R_{3/2}$. The variable $\text{Undefined control sequence DeltaR}$ measures the average number of neighboring jets for jets from an inclusive jet sample. The variable $R_{\mathrm{\Delta }\varphi }$ measures the fraction of the inclusive dijet...

62. Normalised Multi-jet Cross Sections using Regularised Unfolding and Extractions of alpha_s(M_Z) in Deep-Inelastic Scattering at high Q^2 at HERA

Mr Daniel Britzger (DESY)

18/07/2013, 09:45

QCD

Talk presentation

New results on normalised inclusive jet, di-jet and trijet differential cross sections in neutral current deep-inelastic ep scattering (DIS) based on a regularised unfolding procedure are presented. Detector effects like acceptance and migrations as well as statistical correlations between the multi-jets and the inclusive DIS events are taken into account in this procedure. The DIS phase space...

600. ${\alpha }_S$ from $F_{\pi }$ and Renormalization Group Optimized Perturbation

Jean-Loic Kneur (U)

18/07/2013, 10:00

QCD

Talk presentation

A variant of variationally optimized perturbation, incorporating renormalization group properties in a straightforward way, is used at three successive orders to calculate the nonperturbative ratio $F_{\pi }/\mathrm{\Lambda }$ of the pion decay constant and the basic QCD scale in the MSbar scheme. We demonstrate the good stability and (empirical) convergence properties of this modified perturbative series...

414. Inclusive and dijet jet production measured with the ATLAS detector

Lucy Anne Kogan (University of Oxford (GB))

18/07/2013, 10:15

QCD

Talk presentation

Inclusive jet and dijet double­differential cross sections have been measured in proton­proton collisions using the ATLAS detector. The cross sections were measured using jets clustered with the anti­kT algorithm. The data are compared to expectations based on next­to­leading order QCD calculations corrected for non­perturbative effects, as well as to next­to­leading order Monte Carlo...

415. Properties of the jet production in pp collisions measured with the ATLAS detector

Sanya Solodkov (Institute for High Energy Physics (RU))

18/07/2013, 11:00

QCD

Talk presentation

Several aspects of the jet production in pp collisions have been measured by the ATLAS collaboration. Measurements of multi­jet systems, including heavy flavour production, with or without a veto on additional jets, probe QCD radiation effects. A measurement of the inclusive multiplicity ratio is sensitive to the strong coupling constant alpha_S and has reduced sensitivity to the uncertainties...

160. Jet performance in CMS

Mr Henning Kirschenmann (Hamburg University (DE))

18/07/2013, 11:15

QCD

Talk presentation

Calibration and reconstruction of jets critically rely on the performance of the calorimeters. Extending from out to $\eta <5$, jets must critically rely on the interplay between forward calorimeters, central calorimeters and the tracker. The high pileup scenario poses further complications. These difficulties are overcome in CMS using the "particle flow approach". A summary of the...

653. Integrand reduction at NLO and beyond

Tiziano Peraro (Max Planck Institute for Physics - Munich)

18/07/2013, 11:30

QCD

Talk presentation

I will present a novel approach for reduction of scattering amplitudes, based on multivariate polynomial division. This technique extends the one-loop integrand reduction yielding the complete integrand decomposition for arbitrary amplitudes,regardless of the number of loops. It allows for the determination of the residue at any multi-particle cut, whose knowledge is a mandatory prerequisite...

421. Studies of jet shapes and substructure with ATLAS

Peter Loch (University of Arizona (US))

18/07/2013, 11:45

QCD

Talk presentation

The internal structure of jets produced at the LHC is important both as a direct test of perturbative QCD and as a tool to identify boosted electroweak­scale objects decaying to hadrons. The transverse energy distribution around the jet core has been measured, as well as the fragmentation of a jet into charged particles. Jet shapes, single­jet masses, and jet substructure have the potential to...

908. CMS results on boosted-objects & jet substructure

Alexander Schmidt (University of Hamburg)

18/07/2013, 12:00

QCD

Talk presentation

354. Tools for calculations in color space

Malin Sjodahl (Lund University)

18/07/2013, 12:15

QCD

Talk presentation

Both the higher energy and the initial state colored partons contribute to making exact calculations in QCD color space more important at the LHC than at its predecessors. This is applicable whether the method of assessing QCD is fixed order calculation, resummation, or parton showers. In this talk I will discuss tools for tackling the problem of performing exact color summed calculations. I...

177. Charged jet spectra in proton-proton collisions with the ALICE experiment at the LHC

Michal Vajzer (Acad. of Sciences of the Czech Rep. (CZ))

18/07/2013, 12:30

QCD

Talk presentation

Jets are collimated sprays of particles resulting from fragmentation of associated hard scattered partons. They are measured in different types of collisions at different energies to test perturbative Quantum Chromodynamic calculations and are used to study the hard scattering, fragmentation, hadronisation and other properties of partons. These properties studied in simple systems such as...

476. Soft-gluon resummations and NNNLO expansions

Nikolaos Kidonakis (Kennesaw State University)

18/07/2013, 12:45

QCD

Talk presentation

I discuss the effectiveness of soft-gluon resummations in desribing higher-order corrections. I present a comparison of recent resummation approaches and their relative successes in approximating complete NNLO corrections. I also discuss fixed-order expansions through NNNLO and present some recent applications to QCD hard-scattering processes.

58. Inclusive Deep Inelastic Scattering at High Q2 with Longitudinally Polarised Lepton Beams at HERA

Zhiqing Philippe Zhang (Universite de Paris-Sud 11 (FR))

18/07/2013, 14:30

QCD

Talk presentation

Inclusive e\pmp single and double differential cross sections for neutral and charged current deep inelastic scattering processes are measured with the H1 detector at HERA. The data were taken at a centre-of-mass energy of \surds = 319GeV with a total integrated luminosity of 333.7 pb-1 shared between two lepton beam charges and two longitudinal lepton polarisation modes. The differential...

59. Combination and QCD Analysis of Charm Production Cross Section Measurements in Deep-Inelastic ep Scattering at HERA

Katerina Lipka (Deutsches Elektronen-Synchrotron (DE))

18/07/2013, 14:47

QCD

Talk presentation

Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections sigma_red^{c\bar{c}} for charm production are obtained in the kinematic range of photon virtuality 2.5 < Q2 < 2000 GeV2 and Bjorken scaling variable 0.00003 < x < 0.05. The combination method accounts for the correlations of the...

33. Measurement of charm production in DIS with D mesons and extraction of F2cc

Massimo Corradi (Universita e INFN (IT))

18/07/2013, 15:04

QCD

Talk presentation

Charm production in deep inelastic ep scattering was measured with the ZEUS detector using an integrated luminosity of 354 pb-1. Charm quarks were identified by reconstructing D+ mesons in the D+ -- > K- π+π+ decay channel. Lifetime information was used to reduce combinatorial background substantially. Differential cross sections were measured in the kinematic region 5 < Q2 < 1000 GeV2, 0.02...

31. Isolated photons+jet in DIS

Dr Peter John Bussey (University of Glasgow (GB))

18/07/2013, 15:21

QCD

Talk presentation

Isolated-photon+jet production in ep collisions at a centre-of-mass energy of 318 GeV has been measured with the ZEUS detector at HERA using an integrated luminosity of up to 300 pb-1. Measurements of prompt-photon+jet cross sections are presented as functions of the photon transverse energy and pseudorapidity in a wide range of exchanged-photon virtuality. In addition, differential...

597. High Precision DIS with the LHeC

Amanda Cooper-Sarkar, Amanda Sarkar (University of Oxford (GB))

18/07/2013, 15:38

QCD

Talk presentation

The Large Hadron Electron Collider (LHeC) is a proposed facility which will exploit the new world of energy and intensity offered by the LHC through collisions with a new 60 GeV electron beam. This contribution summarises the detailed simulation studies on precision QCD topics included in the Conceptual Design Report, plus its relation with the LHC, and the outlook towards a Technical Design...

534. HERAFitter - an open source QCD fit framework

Andrey Sapronov (Joint Inst. for Nuclear Research (RU))

18/07/2013, 16:30

QCD

Talk presentation

The proton parton distribution functions (PDFs) are essential for precision physics at the LHC and other hadron colliders. Their current level of accuracy dominates the theory uncertainties in Higgs production and it affects substantially theory predictions for Beyond Standard Model high mass production. The determination of the PDFs is a complex endeavor involving several physics...

420. Impact of ATLAS data on parton density functions

Dr Voica Ana Maria Radescu (Deutsches Elektronen-Synchrotron (DE))

18/07/2013, 16:47

QCD

Talk presentation

Various measurements provided by the ATLAS collaboration have significant impact on parton density functions. Inclusive production of W and Z bosons have been analysed using an NNLO QCD fit and found to constraint the strange­quark density at medium and low Bjorken­x. The inclusive jet production at different centre­of­mass energies, measured by ATLAS are used in an NLO QCD fit and show impact...

561. Latest results from the HERMES experiment

Charlotte Van Hulse, charlotte Van Hulse

18/07/2013, 17:04

QCD

Talk presentation

HERMES had taken a wealth of deep-inelastic scattering (DIS) data using the 27.6 GeV polarized lepton beam at HERA and various pure gas targets, both unpolarized and polarized, which opened the door to several unique results. Among them are the first evidences for the naive-T-odd Sivers and Collins effects but also the recent first measurements of azimuthal modulations in the unpolarized...

132. New results on the proton spin-dependent structure function g1p at COMPASS with E=200 GeV

Elena Zemlyanichkina (Joint Inst. for Nuclear Research (RU))

18/07/2013, 17:26

QCD

Talk presentation

New results of the double spin asymmetry A1p and the spin-dependent structure function of the proton g1p as a function of $x_{Bj}$ and $Q^2$ will be presented. New COMPASS data on longitudinal polarized NH${}_3$ target were collected during the year 2011 with beam of positive muons with energy E = 200 GeV}. It allows us to cover low $x$ region down to 0.025 in the range...

656. COMPASS results on transverse-spin asymmetries in hadron pair production in SIDIS

Nour Makke (Universita e INFN (IT))

18/07/2013, 17:43

QCD

Talk presentation

The transversity parton distribution remains a poorly known cornerstone in the nucleon spin structure. While the Collins effect in spin asymmetries in Semi-Inclusive DIS (SIDIS) is one crucial tool to address the transversity function, the most promising alternative is the azimuthal asymmetry in SIDIS when a hadron pair is detected in the final state. In this case, the chiral-odd transversity...

28. e+p high Q2 neutral current cross sections and structure function xF3

Allen Caldwell (Max Planck Institute), Allen Christopher Caldwell (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D)

19/07/2013, 09:00

QCD

Talk presentation

The cross sections for neutral current deep inelastic scattering in e+p collisions with a longitudinally polarised positron beam have been measured using the ZEUS detector at HERA. The single-differential cross-sections dsigma/dQ2, dsigma/dx and dsigma/dy and the double-differential cross sections in Q2 and x are measured in the kinematic region Q2 > 185 GeV2 for both positively and...

40. Measurement of positron-proton neutral current cross sections at high Bjorken-x with the ZEUS detector at HERA

Allen Caldwell (Max Planck Institute), Allen Christopher Caldwell (Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut) (D)

19/07/2013, 09:15

QCD

Talk presentation

New measurements of the differential cross sections for neutral current deep inelastic ep collisions up to Bjorken-x values equal to one are presented. The measurements were performed using the data collected with the ZEUS detector at HERA with sqrt(s) = 318 GeV and an integrated luminosities of 142(187) pb-1 for e+p(e-p) collisions. A new method was employed to reconstruct the kinematic...

485. Jet production measurements at CMS

Sanmay Ganguly (Tata Inst. of Fundamental Research (IN))

19/07/2013, 09:40

QCD

Talk presentation

We present CMS results related to jet production cross sections, which pose a central test to perturbative QCD predictions. Results include recent jet, dijet, and multijet differential cross section measurements performed with 2011 data taken at center-of-mass energy of 7 TeV and 2012 data taken at 8 TeV.

179. NLO QCD Production of Higgs plus jets with GoSam

Giovanni Ossola (City University of New York (US))

19/07/2013, 09:55

QCD

Talk presentation

After reviewing the main features of the GoSam framework for automated one-loop calculations, we will show a selection recent phenomenological results obtained with it. In particular, we will present results for NLO QCD corrections to the production of Higgs boson in conjunction with jets at the LHC.

652. NLO QCD corrections to the production of W+W+jj in vector-boson fusion at the LHC

Lucia Hosekova

19/07/2013, 10:15

QCD

Talk presentation

Vector-boson fusion processes involving the scattering of vector bosons constitute an irreducible background to Higgs-boson production in association with two jets, as they share the same kinematical characteristics. It is therefore desirable to obtain accurate theoretical predictions and error estimates for these background processes with accuracy that goes beyond the leading order. I show...

524. Exclusive diboson production and anomalous quartic gauge couplings at CMS

Jonathan Hollar (Lawrence Livermore National Laboratory), Jonathan Jason Hollar (Universite Catholique de Louvain (BE))

19/07/2013, 11:00

QCD

Talk presentation

We present studies of exclusive WW production via photon-photon exchange, using data collected by the CMS detector at a center of mass energy of 7 TeV. The results are interpreted in terms of limits on anomalous quartic gauge couplings.

416. Photon, diphoton and photon+jet production measured with the ATLAS detector

Mark Stockton (McGill University (CA))

19/07/2013, 11:15

QCD

Talk presentation

Isolated prompt photons provide a direct probe of short­distance physics, complementary to that provided by measurements of jets or vector­bosons. The data are sensitive to the gluon density of the proton. The inclusive prompt photon cross sections have been measured over a wide range of transverse momenta; the diphoton cross section has also been measured as a function of diphoton mass, total...

916. Electroweak production of Z bosons with forward-backward jets at CMS

Pedro Vieira De Castro Ferreira Da Silva (CERN)

19/07/2013, 11:30

QCD

Talk presentation

417. Measurement of W and Z boson production with the ATLAS detector

Alessandro Tricoli (CERN)

19/07/2013, 11:45

QCD

Talk presentation

The production of the W and Z bosons is a standard candle process at the LHC. Precise total cross section measurements, in the fiducial region of the measurement and extrapolated to full phase space are presented. The differential Z/gamma∗ and the charge dependent W+ and W­ cross sections are provided in bins of boson rapidity and lepton pseudorapidity, respectively. The results are compared...

418. Measurements of jet production in association with W and Z bosons with the ATLAS detector

Alessandro Tricoli (CERN)

19/07/2013, 11:55

QCD

Talk presentation

The production of jets in association with a W or Z boson in proton­proton collisions at 7 TeV represent an important process to study QCD in a multi­scale environment. The cross sections, differential in several kinematics variables, have been measured up to high jet multiplicities and compared to new higher­order QCD calculations. The ratio of (Z + a single jet)/(W + a single jet) can...

456. Measurement of W/Z boson + jet production differential cross sections

Bjoern Penning (University of Chicago (US))

19/07/2013, 12:05

QCD

Talk presentation

Associated production of a W/Z bosons with jets are studied as a function of various kinematic observables. We present measurements of the ratios of cross sections, $\sigma (p\overline{p}\to Z+b\text{jet})$/$\sigma (p\overline{p}\to Z+\text{jet})$, $\sigma (p\overline{p}\to Z+c\text{jet})$/$\sigma (p\overline{p}\to Z+\text{jet})$ and $\sigma (p\overline{p}\to Z+c\text{jet})$/$\sigma (p\overline{p}\to Z+b\text{jet})$,...

458. Measurement of the photon + b/c-jet and diphoton production differential cross section in ppbar collisions at sqrt{s}=1.96 TeV

Bjoern Penning (University of Chicago (US))

19/07/2013, 12:15

QCD

Talk presentation

We present measurements of the differential cross section dsigma/dpT_gamma for the inclusive production of a photon in association with a b/c-quark jet. The results are based on data corresponding to an integrated luminosity of 8.7 fb^-1, recorded with the D0 detector at the Fermilab Tevatron ppbar collider at sqrt(s)=1.96 TeV. The measured cross sections are compared with next-to-leading...

492. Vector boson + jets measurements at CMS

Matthias Artur Weber (Univ. of California Los Angeles (US))

19/07/2013, 12:25

QCD

Talk presentation

The associated production of jets and vector bosons allows for stringent tests of perturbative QCD calculations and is sensitive to the possible presence of new physics beyond the Standard Model. Measurements of jet production rates in association with W, Z or photons, in proton-proton collisions at 7 TeV and 8 TeV center-of-mass energy are presented, using data collected with the CMS...

610. NNLO W Pair Production at the LHC: Status Report

Grigorios Chachamis (IFIC (CSIC/UV) Valencia)

19/07/2013, 12:40

QCD

Talk presentation

We will discuss the result with full mass dependence for the two-loop virtual QCD corrections to the W boson pair production in the quark-anti-quark annihilation channel. We will also report on our progress regarding the treatment of the double-real and virtual-real radiative corrections which are the other two necessary ingredients for a theoretical prediction of the total cross section to...

890. Inclusive diffraction, DVCS and vector meson production at HERA

Dr Marta Ruspa (Universita e INFN (IT))

19/07/2013, 14:30

QCD

Talk presentation

Inclusive diffraction, DVCS and vector meson production at HERA (agreed talk with H1/ZEUS collaborations)

886. Recent H1 results on diffraction

Sergey Levonian (Deutsches Elektronen-Synchrotron (DE))

19/07/2013, 14:50

QCD

Talk presentation

Recent H1 results on diffraction (agreed talk with H1/ZEUS collaborations)

87. Higher twist effects in diffractive DIS at HERA

Mariusz Sadzikowski (Jagiellonian University)

19/07/2013, 15:05

QCD

Talk presentation

I discuss a twist decomposition of difractive structure functions in the difractive deep inelastic scattering (DDIS) at HERA. At low photon virtuality and at large energy the data exhibit a strong excess above the twist-two NLO DGLAP description. It is found, that complementing the DGLAP fit by twist 4 and 6 components of the GBW saturation model leads to a good description of data. In...

46. Inclusive Jets in PHP

Mr Philipp Roloff (Deutsches Elektronen-Synchrotron (DESY)), Philipp Roloff (DESY), Dr Philipp Roloff (CERN)

19/07/2013, 15:20

QCD

Talk presentation

Differential inclusive-jet cross sections have been measured in photoproduction for boson virtualities Q2 < 1 GeV2 with the ZEUS detector at HERA using an integrated luminosity of 300 pb-1. Jets were identified in the laboratory using the kt cluster algorithm in the longitudinally inclusive mode. Cross sections are presented as functions of the jet pseudorapidity, etajet, and the...

887. Recent H1 results on Heavy Flavour Photoproduction

Michel Sauter

19/07/2013, 15:35

QCD

Talk presentation

Recent H1 results on Heavy Flavour Photoproduction (agreed talk with H1/ZEUS collaborations)

903. Review of H1 results on the hadronic final state at HERA

Lidia Goerlich (Kraków Univ)

19/07/2013, 15:50

QCD

Talk presentation

446. Recent cross section, diffractive and forward multiplicity measurements with TOTEM

Kenneth Oesterberg (Helsinki Institute of Physics (FI)), Kenneth Osterberg (University of Helsinki)

19/07/2013, 16:10

QCD

Talk presentation

TOTEM is dedicated experiment at the LHC to the measurements of elastic, diffractive and other forward processes. Elastically and diffractively scattered protons are measured using silicon detectors in Roman Pots (RP) and charged particles by the T1 and T2 telescopes covering the pseudorapidity range 3.1 to 6.5. TOTEM has measured the luminosity-independent total, elastic and inelastic...

176. Charged Particle Multiplicity and Pseudorapidity Density Measurements in pp collisions with the ALICE Experiment at the LHC

Chiara Zampolli (Universita e INFN (IT))

19/07/2013, 17:00

QCD

Talk presentation

ALICE is the LHC experiment dedicated to the study of ultra-relativistic Heavy-Ion collisions. Among the main characteristics of ALICE, its very low pT cut-off and material budget make it play an important role in the LHC pp physics program, especially in the soft QCD realm. In addition, pp collisions are of fundamental importance to provide input for Monte Carlo tuning, and to serve as a...

242. Studies of soft QCD at LHCb

Marco Meissner (Ruprecht-Karls-Universitaet Heidelberg (DE))

19/07/2013, 17:15

QCD

Talk presentation

Due to its unique pseudorapidity coverage and the possibility of extending measurements to low transverse momenta, LHCb provides important input to the understanding of particle production in a kinematical range where QCD models have large uncertainties. Measurements of charged, strange and charmed particle production and energy flow are performed in the approximate pseudorapidity range...

896. Soft QCD results in ATLAS+CMS

Claire Gwenlan (University of Oxford (GB))

19/07/2013, 17:30

QCD

Talk presentation

445. The Energy Dependence of the Underlying Event in Hadronic Collisions

Richard D. Field, Richard Dryden Field (University of Florida (US))

19/07/2013, 17:47

QCD

Talk presentation

At CDF we study charged particles production (pT > 0.5 GeV/c, |eta| < 0.8) in proton-antiproton collisions at 300 GeV, 900 GeV, and 1.96 TeV. The 300 GeV and 900 GeV data are a result of the "Tevatron Energy Scan" which was performed just before the Tevatron was shut down. We use the direction of the leading charged particle in each event, PTmax, to define three regions of eta-phi...

898. Double-parton-scatterings and multi-parton-interactions in ATLAS+CMS

Ramandeep Kumar (Panjab University (IN))

19/07/2013, 18:02

QCD

Talk presentation

526. Double parton distributions - bounds and evolution

Tomas Kasemets (DESY)

19/07/2013, 18:19

QCD

Talk presentation

Double hard scattering in proton-proton collisions is described in terms of double parton distributions. We derive bounds on these distributions from their interpretation as probability densities, taking all possible spin correlations between two partons in an unpolarized proton into account. These bounds can be used to set limits on the effects of spin correlations in double hard scattering....

387. QCD description of ATLAS jet veto data

Dominik Werder (Uppsala Universitet), Dominik Werder (Uppsala Universitet)

19/07/2013, 18:34

QCD

Talk presentation

The recent ATLAS data on dijet production with a veto on the additional interjet radiation is described by using the Banfi-Marchesini-Smye equation, which resums both the Sudakov logarithms as well as the non-global logarithms to leading log accuracy, to constrain the interjet energy flow. Without additional fit parameters, a good description of the data is obtained. Implications for BFKL...

763. Merging of matrix elements and parton showers at NLO accuracy

Marek Schoenherr (University of Durham)

19/07/2013, 18:49

QCD

Talk presentation

The merging of matrix elements and parton showers is an established calculational tool for the description of multi-jet final states at hadron colliders. These methods have recently been promoted to next-to-leading order accuracy in the description of hard well separated jets. This talk will introduce such a method and discuss its application to phenomenologically relevant signal and...

897. Review of LHCb Heavy-Quark and Quarkonia results

Zhenwei Yang (Tsinghua University (CN)), Dr Zhenwei Yang (Tsinghua University (CN))

20/07/2013, 09:00

QCD

Talk presentation

602. Heavy-Flavor measurements in proton-proton collisions with ALICE

Matthias Richter (University of Oslo (NO))

20/07/2013, 09:20

QCD

Talk presentation

The study of heavy flavor production in proton-proton collisions is of particular interest for quantum chromodynamics (QCD), as charm and beauty quarks possess large masses and are thus mainly created in hard partonic scattering processes. Cross sections obtained from measurements for charm and beauty quarks allow to constrain theories and to provide important parameters for model...

900. Measurements of Quarkonium production and polarization at CMS

Ilse Kratschmer (Austrian Academy of Sciences (AT)), Ilse Kratschmer (Austrian Academy of Sciences (AT))

20/07/2013, 09:35

QCD

Talk presentation

895. Review of ATLAS Heavy-Quark and Quarkonium results

Miriam Watson (University of Birmingham (GB))

20/07/2013, 09:53

QCD

Talk presentation

558. Radiative decays of charmonium

Damir Becirevic (CNRS et Universite Paris Sud), Damir Becirevic (Unknown)

20/07/2013, 10:11

QCD

Talk presentation

A long standing problem of theoretical estimate of the $J/\psi \to {\eta }_c\gamma$ decay amplitude has been solved recently by means of QCD on the latice. We describe and explain the progress and discuss the new results that are also a challenge to experimenters. We also discuss several other decay modes of charmonia, including the very first estimate of ${\eta }_c(2S)\to J/\psi \gamma$ that was...

894. Review of rare kaon decays (NA48/2 and NA62)

Evgueni Goudzovski (University of Birmingham)

20/07/2013, 11:00

QCD

Talk presentation

Recent measurements of the rare decay K+- --> pi+- gamma gamma at the NA48/2 and NA62 experiments are presented, including model-independent spectrum measurements and fits to the Chiral Perturbation Theory description. Precision measurements of the form factors and branching ratios of the K+- --> pi+ pi- e+- nu and K+- --> pi0 pi0 e+- nu decays at the NA48/2 experiment are also presented.

85. Resolving the puzzle of the pion-photon transition form factor

Dmitri Melikhov (M. V. Lomonosov State University), Dmitri Melikhov (HEPHY)

20/07/2013, 11:20

QCD

Talk presentation

Making use of dispersive QCD sum rules, we analyze the pseudoscalar meson–photon transition form factors. We show that most of the existing measurements – the BaBar results for eta, eta’, and eta_c and the Belle results for pi^0 – are well compatible with each other and with the saturation predicted by pQCD factorization theorems and give a hint that the saturation is effective already at...

899. Review of Belle QCD results

Min-Zu Wang (Physics Department-National Taiwan University (NTU)-Unknown), Prof. Min-Zu Wang (National Taiwan Univ.)

20/07/2013, 11:35

QCD

Talk presentation

901. Light hadrons production in e+e- annihilation (BaBar)

Bill Gary (University of California Riverside (US))

20/07/2013, 12:00

QCD

Talk presentation

902. Studies of charmonium-like states and properties of charmed mesons (BaBar)

Dr Nicolas Arnaud (LAL (CNRS-IN2P3))

20/07/2013, 12:15

QCD

Talk presentation

355. B_s meson decays in the framework of the covariant quark model

Andrej Liptaj (Slovak Academy of Sciences (SK))

20/07/2013, 12:30

QCD

Talk presentation

Covariant quark model is an ambitious model which is, inter alia, well suited for description of hadron decays. The model with its main features will be presented and then applied to describe some exclusive decays of the B_s meson. Results will be discussed in comparison with experimental data and other models.

572. Hadron physics studies at KLOE

Caterina Bloise (Istituto Nazionale Fisica Nucleare (IT)), Caterina Bloise (Laboratori Nazionali di Frascati (LNF))

20/07/2013, 12:45

QCD

Talk presentation

The V-->Pgamma Dalitz decays, associated to internal conversion of the photon into a lepton pair, are not well described by the Vector Meson Dominance (VMD) models, as in the case of the process omega --> pi0 mu+ mu-, measured by the NA60 collaboration. The only existing data on phi --> eta e+ e- come from the SND experiment, which has measured the Mee invariant mass distribution...