DIS 2007
→
Europe/Zurich
Holiday Inn Munich City Centre & Gasteig Conference Center
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3
81669 Munich
Germany
Description
XV International Workshop on Deep-Inelastic Scattering and Related Subjects
Support
Participants
299
View full list
-
-
17:00
→
19:00
Registration 2h Foyer Großer Saal (Holiday Inn)
Foyer Großer Saal
Holiday Inn
-
18:00
→
20:00
Reception 2h Foyer Großer Saal and Forum 4&5 (Holiday Inn)
Foyer Großer Saal and Forum 4&5
Holiday Inn
-
17:00
→
19:00
-
-
08:00
→
09:00
Breakfast 1h Foyer Großer Saal and Forum 4&5 (Holiday Inn)
Foyer Großer Saal and Forum 4&5
Holiday Inn
- 09:00 → 10:45
-
10:45
→
11:15
Coffee/Tea 30m Foyer Carl-Orff-Saal (Gasteig)
Foyer Carl-Orff-Saal
Gasteig
- 11:15 → 12:45
-
12:45
→
14:00
Lunch 1h 15m Forum 1 and Restaurant (Holiday Inn)
Forum 1 and Restaurant
Holiday Inn
-
14:00
→
16:00
Plenary Session Carl-Orff-Saal (Gasteig)
Carl-Orff-Saal
Gasteig
- 14:00
- 14:30
- 15:00
- 15:30
-
16:00
→
16:30
Coffee/Tea 30m Foyer Carl-Orff-Saal (Gasteig)
Foyer Carl-Orff-Saal
Gasteig
- 16:30 → 18:00
-
08:00
→
09:00
-
-
08:00
→
09:00
Breakfast 1h Foyer Großer Saal and Forum 4&5 (Holiday Inn)
Foyer Großer Saal and Forum 4&5
Holiday Inn
-
09:00
→
10:40
Diffraction and Vector Mesons: 1 Forum 8 (Holiday Inn)
Forum 8
Holiday Inn
- 09:00
- 09:20
- 09:40
- 10:00
- 10:20
-
09:00
→
10:40
Heavy Flavors: 1 - Charm at HERA Forum 7
Forum 7
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich GermanyConvener: Benno List (University of Hamburg)- 09:00
- 09:20
- 09:40
- 10:00
- 10:20
-
09:00
→
10:40
Hadronic Final States and QCD: 1 Kopenhagen & Zürich (Holiday Inn)
Kopenhagen & Zürich
Holiday Inn
- 09:00
- 09:20
- 09:40
- 10:00
- 10:20
-
09:00
→
10:40
Structure Functions and Low-x: 1 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 09:00
- 09:20
- 09:40
- 10:00
- 10:20
-
09:00
→
10:40
Spin Physics: 1 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
- 09:00
-
09:20
The deuteron spin-dependent structure function g_1^d 20mResults on the deuteron longitudinal inclusive spin-dependent asymmetryA_1^d and the spindependentstructure function g_1^d are presented. The data have been collected by the COMPASS experiment at CERN during the years 2002-2004 using 160 GeV/c polarised muon beam scattered off a polarised 6LiD target. The obtained values for Gamma_1^d, the first moment of g_1^d(x), and for the flavor-singlet axial current matrix element, a_0 are also shown. The results of the QCD fits in the NLO approximation on allg_1 deep inelastic data are presented.Speaker: Krzysztof Kurek (Soltan Institute for Nuclear Studies)
-
09:40
The final HERMES data on g1p and g1n 20mPrecise measurements of the spin structure functions $g_1^^p(x,Q2)$ and $g_1^n(x,Q2)$ are presented over the kinematic range 0.0041 $\leq x \leq $ 0.9 and 0.18 GeV$^2$ $\leq Q2 \leq $ 20 GeV$^2$. The data were collected at the HERMES experiment at DESY, in deep-inelastic scattering of 27.6 GeV longitudinally polarized positrons off longitudinally polarized hydrogen and deuterium gas targets internal to the HERA storage ring. The results base on a refined analysis and are corrected for radiative and detector smearing effects using an unfolding algorithm that accounts for the kinematic migration of events. The presently most precise determination of the neutron spin structure function g_1^n is obtained by combining the HERMES deuteron and proton data. Integrals of g_1^p, g_1^d and g_1^n are calculated over the measured x range, at Q2=5 GeV^2. Neglecting any possible contribution to the g_1^d integral from the regionx<= 0.021, a value of 0.330 +- 0.011 (theo.) +- 0.025 (exp.) +- 0.028 (evol.) is obtained for the flavor-singlet a_0 in a leading twist NNLO analysisSpeaker: Lara De Nardo (DESY / TRIUMF)
-
10:00
Polarized parton densities and higher twist in the light of the recent CLAS and COMPASS data 20mThe results of a new NLO QCD analysis of the world data on inclusive polarized DIS are presented. The very precise CLAS proton and deuteron data, as well as the latest COMPASS data on the asymmetry $A_1^d$ were included in the analysis, and the impact of these data on polarized parton densities and higher twist effects has been studied. It is demonstrated that the low Q^2 CLAS data improve essentially our knowledge of higher twist corrections to the spin structure function g_1, while the large Q^2 COMPASS data influence mainly the strange quark density. It is also shown that a negative polarized gluon density, or one that changes a sign as a function of x, cannot be ruled out on the basis of the present DIS data.Speaker: Dimitar Stamenov (INRNE, Sofia)
-
10:20
Spin structure functions at CLAS 20mThe CLAS Collaboration at Jefferson Lab has a sustained and comprehensive program measuring the spin structure function g_1 for the proton and deuteron at low and intermediate Q2. Precise data with extensive kinematic coverage allow us to better constrain the polarized parton distributions and to accurately determine various moments of g_1 as a function of Q2. Our latest results will be shown, emphasizing comparisons with NLO global fits, chiral perturbation theory, higher-twist expectations, the GDH and Bjorken sum rules, and hydrogen hyperfine splittings.Speaker: Keith Griffioen (College of William & Mary)
-
10:40
→
11:10
Coffee/Tea 30m Foyer Großer Saal and Forum 4&5 (Holiday Inn)
Foyer Großer Saal and Forum 4&5
Holiday Inn
-
11:10
→
12:50
Diffraction and Vector Mesons: 2 Forum 8 (Holiday Inn)
Forum 8
Holiday Inn
- 11:10
-
11:30
The ratio of sigma_L/sigma_T in DIS at low x 20mDear organizers, I would be happy to present a contribution "on the ratio of Sigma(long.) to Sigma(trans.) in Dis at low x" , i.e. F(long), predictions based on unpublished investigations by Kuroda and myself. For my earlier related work kindly look at e.g. hep ph/0607031, hep ph 0511091, and hep ph/ 0203028 etc. In view of the measurements being prepared at Hera on the long. structure function this is an important subject to be presented. With best regards Dieter SchildknechtSpeaker: Dieter Schildknecht (University of Bielefeld and MPI Munich)
- 11:50
- 12:10
-
12:30
Discussion 20m
-
11:10
→
13:00
Heavy Flavors: 2 - Heavy quark production Forum 7
Forum 7
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich GermanyConvener: Michael Klasen (University of Grenoble)- 11:10
- 11:35
- 12:05
-
12:35
Heavy quark mass effects in QCD and heavy quark parton distributions 20mSpeaker: Wu-Ki Tung (Washington University)
-
11:10
→
12:50
Hadronic Final States and QCD: 2 Kopenhagen & Zürich (Holiday Inn)
Kopenhagen & Zürich
Holiday Inn
- 11:10
- 11:30
- 11:50
- 12:10
- 12:30
-
11:10
→
12:50
Structure Functions and Low-x: 2 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 11:10
- 11:30
-
11:50
Update on CTEQ global analyses 20m---Speaker: Wu-Ki Tung (Washington University)
- 12:10
- 12:30
-
11:10
→
12:50
Spin Physics: 2 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
-
11:10
Photoproduction of hadron pairs with high transverse momenta at fixed target experiments 20mWe consider the photoproduction of two hadrons in polarized lepton-nucleon collisions in the framework of perturbative QCD. After illustrating how to obtain the experimentally relevant observables a detailed phenomenological study of the photoproduction of hadron pairs at high transverse momenta is presented. We show theoretical predictions for the relevant cross sections and double-spin asymmetries at HERMES and COMPASS kinematics as well as theoretical uncertainties and analyze the sensitivity of the asymmetries to the gluon polarization delta g in the nucleon.Speaker: Christof HENDLMEIER (University of Regensburg)
-
11:30
Determination of ΔG/G from HERMES Data on high-pT inclusive charged hadrons 20mHERMES has used a high statistics data sample of charged inclusive hadrons to measure double spin asymmetries as a function of p_T. From these asymmetries Delta g/g has been extracted in the region of 1<p_T<2 GeV, corresponding to x\approx0.2-0.3 The information on the background asymmetry and the subprocess kinematics has been obtained from a Leading Order Monte Carlo model and existing parametrizations of the spin dependent quark distributions. Values for Delta g/g have been calculated both as a function of the measured p_T and x. The results will be presented together with comparisons of the Monte Carlo and data and a study on the effects of varying the model's parameters.Speaker: Patricia Liebing (RIKEN / BNL)
-
11:50
Determination of ΔG/G from open charm events at COMPASS 20mOne of the main goals of the COMPASS experiment at CERN is the determination of the gluon polarisation in the nucleon, Delta G/G. It is determined from spin asymmetries measured in the scattering of 160GeV/c polarised muons on a polarised LiD target. The gluon is accessed by the selection of photon-gluon fusion events. A selection of PGF events can be obtained with charmed mesons in the final state. Their detection is based on the reconstruction of decayed D^* and D^0 mesons in the COMPASS spectrometer. The analysis method will be discussed and the final result for Delta G/G from the open charm channel for the 2002-2004 data taking period will be presented.Speaker: Susanne Koblitz (Institut fuer Kernphysik / Universitaet Mainz)
-
12:10
Study of proton helicity structure in polarized p+p collisions at PHENIX 20mTo study the proton spin structure, the Relativistic Heavy Ion Collider (RHIC) at BNL provides a unique opportunity by colliding polarized protons. The hard subprocesses in proton-proton collisions involve gluons in leading order, therefore measurements of cross section asymmetries between aligned and anti aligned proton helicities give us information about the spin dependent gluon distribution, which might hold the longstanding missing proton spin component. For the longitudinal spin program, the PHENIX experiment accumulated about 10/pb of data at sqrt(s)=200GeV with roughly 60% proton beam polarization and 0.1/pb of data at sqrt(s)=62GeV with 50% polarization. Up until now, we have performed spin asymmetry measurements focusing on pi0 production with the central electromagnetic calorimeters. Despite low integrated luminosity, it was shown that the sqrt(s)=62GeV data have comparable sensitivity to the gluon polarization through the high x_T=2p_T/sqrt(s) region. In addition, various channels such as partial jets, charged pions, direct photons in the central rapidity region, large rapidity J/psi's through the muon channel and pi0's in a newly installed large rapidity electromagnetic calorimeter will provide complementary results. We also measure double helicity asymmetries of the average intrinsic k_T by 2-particle correlations,which may be sensitive to the partonic orbital angular momentum, another possible contribution to the proton spin. In this talk, we report recent results and plans of the PHENIX longitudinal spin program.Speaker: Kensuke Okada (Riken / BNL)
- 12:30
-
11:10
-
12:50
→
14:00
Lunch 1h 10m Forum 1 and Restaurant (Holiday Inn)
Forum 1 and Restaurant
Holiday Inn
-
14:00
→
15:40
Diffraction and Vector Mesons: 3 Forum 8 (Holiday Inn)
Forum 8
Holiday Inn
- 14:00
- 14:20
- 14:40
- 15:00
-
14:00
→
15:50
Heavy Flavors: 3 - Heavy ions Forum 7
Forum 7
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich GermanyConvener: Rainer Mankel (DESY)-
14:00
J/psi suppression measurements by the PHENIX experiment at RHIC 30mHeavy ion collisions provide a unique experimental way to create and characterize the hot and dense matter that lattice QCD predicts to be produced at high energy density and temperature. Products of hard processes, which take place in the early stage of the collision, are highly sensitive probes to the evolution of the created system. Suppression of the quarkonium J/\psi, which constitutes such a probe, has been measured by the PHENIX experiment at RHIC in AuAu, CuCu, dAu and pp interactions, as a function of impact parameter, rapidity and transverse momentum. The strong suppression factors observed in central collisions in heavy ion systems suggest that cold nuclear matter effects such as shadowing and nuclear absorption are not the only mechanisms involved. On the other hand, suppression due to color screening effects alone seems to overestimate the suppression measured both at forward rapidity and at mid rapidity. PHENIX also measures a stronger suppression at forward rapidity compared to the one measured at mid rapidity. Regeneration has been suggested as a possible explanation for these observations. Here, models that combine in different ways a regeneration scenario with color screening and cold nuclear effects will be compared to the data. Higher luminosities are expected to bring more information in the future by allowing to perform differential measurements in other variables.Speaker: Ermias T. Atomssa (LLR, Ecole Polytechnique)
-
14:30
Measurements of heavy quark production via single leptons in p+p and Au+Au collisions at sqrt(s) = 200 GeV 30mThe measurement of heavy flavor production at \sqrt{s_{NN}} = 200 GeV in both p+p and Au+Au collisions by the PHENIX Experiment at RHIC provides for complimentary physics exploration in differing collision environments. The measurement of single leptons resulting from the semi-leptonic decay of heavy flavor (charm and bottom) mesons in p+p collisions permits tests of pQCD predictions at \sqrt{s} = 200 GeV, as well as a measurement of a total charm cross section. The measurements for p+p collisions also provide a key baseline against which the analogous single lepton measurements for Au+Au collisions can be quantified. The dense partonic matter produced in Au+Au collisions can be investigated through the simultaneous measurement of the azimuthal anisotropy v2(p_T ) and the nuclear modification factor R_{AA}(p_T ). In the context of existing predictions, the observed flow and energy loss of heavy quarks, in addition to that already seen for light mesons, suggest that the matter formed in Au +Au collisions at RHIC is a near-perfect fluid. The most recent PHENIX single electron results from p+p and Au+Au collisions for 0.3 < p_T < 9.0 GeV/c at | y |< 0.35 are shown. Additionally, the latest PHENIX results for the measurement of heavy flavor production via single muons at 1.5 < | y | < 1.8 in \sqrt{s} = 200 GeV p+p collisions are presented.Speaker: Donald Hornback (Univ. Tennessee)
- 15:00
-
14:00
-
14:00
→
15:40
Hadronic Final States and QCD: 3 Kopenhagen & Zürich (Holiday Inn)
Kopenhagen & Zürich
Holiday Inn
- 14:00
- 14:20
- 14:40
- 15:00
- 15:20
-
14:00
→
15:40
Joint: Structure Functions and Low-x / Electroweak Measurements (Including Top): SF-3 / EW-1 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 14:00
- 14:20
- 14:40
- 15:00
-
14:00
→
15:40
Spin Physics: 3 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
- 14:00
-
14:20
Valence quark polarization from COMPASS 20mA first evaluation of the polarized valence quark distribution\Delta u_v(x)+Delta d_v(x) from the COMPASS experiment (CERN/SPS) is presented. The data were collected by COMPASS in the years 2002--2004 using a 160 GeV polarized muon beam scattered off a large polarized 6LiD target and cover the range 1< Q2 < 100(GeV/c)2 and $0.006<x<0.7. The analysis is based on the difference asymmetry, A^(h+ - h-), for hadrons of opposite charges. This approach gives a direct access to the valence quark helicity distributions because fragmentation functions cancel out in LO QCD, so that the expression for the difference asymmetry is given by the ratio of polarized to unpolarized valence quark distributions. Due to this very weak sensitivity to uncertainties coming from the fragmentation, the results derived from A^(h+ - h-) can be used as a crosscheck for those obtained from single hadron asymmetries as in the SMC and HERMES analyzes.Speaker: Alexander Korzenev (Mainz University)
- 14:40
-
15:00
Nucleon resonances spin structure 20mWe have measured the spin structure of the nucleon in the region of the resonances (final state mass W <2 GeV) at intermediate four-momentum transfer Q2 ~ 1.3 (GeV/c)2. Double-spin inclusive asymmetries for longitudinally polarized 5.75 GeV electrons incident on longitudinal and transverse solid polarized targets were measured in Jefferson Lab's Hall C. Frozen ammonia and deuterated ammonia were used as the polarized materials. The neutron spin structure is extracted from the proton and deuteron asymmetries. We present new results for the proton and deuteron spin asymmetries A1 and A2 and spin structure functions g1 and g2, and preliminary results for the neutron asymmetries. Sum rules for the spin structure functions (extended Gerasimov-Drell-Hearn, Burkhardt-Cottingham, third mo- ments of g2-bar(x) = g2(x) - g_2^(twist-2) (x), Bjorken and Efremov-Leader- Teryaev) have been calculated and are compared to theoretical pre- dictions. These are the first measurements of the transverse proton and deuteron spin structure in the resonances.Speaker: Karl Slifer (University of Virginia)
-
15:20
Theoretical description of the spin structure function g1 at small x and arbitrary Q2 20mStandard Approach (SA) for description of $g_1$ is based on the DGLAP evolution equations and the special fits for the initial parton densities. SA accounts for the total resummation of logs of $Q2$ and lacks the total resummation of leading $ln(1/x)$. In order to meet the small -$x$ experimental data, SA includes phenomenological singular factors in the fits. They mimic the resummation of ln(1/x) and lead to the steep rise of g_1 at small x . When the resummation is accounted for, the fits can be drastically simplified. The further advantage of our approach lays in analysis of DIS at small Q2. Indeed, DGLAP cannot be applied to the region of small Q2 presently studied by COMPASS collaboration. Contrary to it, our approach works in this kinematics and predicts a very week x-dependence of g_1 at small Q2 even at very small values of x. Instead, experimental investigation of the g_1 dependence on the invariant energy 2pq would extremely interesting because it allows one to estimate the impact of the gluon initial density.Speaker: Boris Ermolaev (Ioffe Physico-Technical Institute)
-
15:40
→
16:10
Coffee/Tea 30m Foyer Großer Saal and Forum 4&5 (Holiday Inn)
Foyer Großer Saal and Forum 4&5
Holiday Inn
-
16:10
→
18:10
Heavy Flavors: 4 - Spectroscopy & Rare Decays Forum 7
Forum 7
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich GermanyConvener: Stephanie Hansmann-Menzemer (University of Heidelberg)- 16:10
- 16:40
- 17:00
- 17:20
- 17:50
-
16:10
→
18:00
Hadronic Final States and QCD: 4 Kopenhagen & Zürich (Holiday Inn)
Kopenhagen & Zürich
Holiday Inn
- 16:10
- 16:30
- 16:50
- 17:10
- 17:30
-
16:10
→
18:10
Joint: Structure Functions and Low-x / Diffraction and Vector Mesons: SF-4 / DIFF-4 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 16:10
- 16:30
- 16:50
- 17:10
- 17:30
-
17:50
Discussion 20m
-
16:10
→
18:10
Spin Physics: 4 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
-
16:10
Fragmentation function measurements at BELLE 20mIn order to obtain precise information on helicity and transversity distributions from semi-inclusive measurements in DIS and proton-proton collisions a good knowledge of fragmentation functions is necessary. The Belle experiment at the asymmetric e+e- collider KEKB can provide precise spin averaged and spin dependent fragmentation functions such as the Collins function and the interference fragmentation function. Recent results will be shown.Speaker: Ralf Seidl (University of Illinois at Urbana-Champaign)
-
16:30
HERMES measurement of the Collins and Sivers asymmetries from a transversely polarized hydrogen target 20mIn 2005 the HERMES collaboration published first evidence for azimuthal single-spin asymmetries in semi-inclusive production of charged pions on a transversely polarised hydrogen target. The measured asymmetries are caused by both the Collins and the Sivers mechanisms. Their distinctive Fourier components provide signals to previously unmeasured quantities: the transversity quark distribution in conjunction with the Collins fragmentation function (Collins mechanism/asymmetry) and the Sivers parton distribution (Sivers mechanism/asymmetry). The transversity distribution will provide a detailed insight into the relativistic nature of the quarks inside the nucleon. Continuous theoretical work could relate the Sivers function to the contribution of the orbital angular momentum of both quarks and gluons to the spin of the nucleon. The presented results for charged pions have a much higher statistical significance than the published data, and are accompanied by the measurement of the Collins and Sivers asymmetries for charged kaons.Speaker: Markus Diefenthaler (Physikalisches Institut II, Friedrich-Alexander-Universität)
-
16:50
Single hadron Collins and Sivers measurements by COMPASS 20mThe CERN COMPASS experiment is on the floor collecting data since 2002; in the years 2002, 2003, and 2004 data were collected using a 160 GeV polarized muon beam and a 6LiD polarized target. In about 20% of the running time the target polarisation was oriented transversely with respect to the muon beam direction to measure transverse spin effects in semi inclusive deep inelastic scattering, one of the main objectives of the COMPASS spin program. Here the results for the Collins and the Sivers asymmetries, both for unidentified and identified hadrons (pi+, pi−, K± and K0) from the whole data sample are presented, together with the projected statistical error for the proton run foreseen in 2007. The measured asymmetries on the 6LiD target are small and compatible with zero within the few percent statistical errors, an important result which can be interpreted as cancellation between u and d quark in the deuteron and which allows to better constrain the parton distribution functions.Speaker: Andrea Bressan (INFN Trieste)
-
17:10
Transversity and Collins functions: from e+e- to SIDIS processes 20mWe present a global analysis of azimuthal asymmetries in e^+e^- -> h_1 h_2 X processes (BELLE data) and in semi-inclusive deep inelasticscattering (HERMES and COMPASS data). It results in the extraction of the Collins fragmentation function and of the transversity distribution function for u and d quarks. Theseturn out to have opposite signs and to be sizably smaller than their positivity bounds. Predictions for the azimuthal asymmetry A_{UT}^{\in(phi_h + phi_S) for polarized proton target at JLAB and COMPASS experiments are giveSpeaker: Umberto D'Alesio (Dipartimento di Fisica, Cagliari University)
-
17:30
Transverse quark spin effects in SIDIS 20mThis talk will focus on transverse quark spin effects in SIDIS. I will discuss the theoretical T-odd input to the cos 2\phi azimuthal asymmetry as well as new work on the Collins function and the Boer Mulders function, the essential TMD inputs to this asymmetry. We will present new estimates of the cos2\phi asymmetry as a function of P_T, x, and z. I will also talk a bit about the progress we have made on universality of the Collins Function.Speaker: Leonard Gamberg (Penn State Berks, Dept. of Physics)
-
16:10
-
18:30
→
20:00
Alpha_s: Informal Discussion Session on alpha_s Forum 8
Forum 8
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich Germany-
18:30
Summary of non-DIS measurements 7m Forum 8
Forum 8
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich GermanySpeaker: Siegfried Bethke (MPI for Physics, Munich) - 18:40
- 18:50
- 19:00
- 19:10
-
18:30
-
08:00
→
09:00
-
-
08:00
→
09:00
Breakfast 1h Foyer Großer Saal and Forum 4&5 (Holiday Inn)
Foyer Großer Saal and Forum 4&5
Holiday Inn
-
09:00
→
11:00
Diffraction and Vector Mesons: 5 Forum 8 (Holiday Inn)
Forum 8
Holiday Inn
- 09:00
-
09:20
Exclusive Vector Meson production 20mExclusive Vector Meson productionSpeaker: Aharon Levy (DESY / Tel Aviv University)
- 09:40
- 10:00
- 10:20
-
09:00
→
10:40
Electroweak Measurements (Including Top) and Beyond the Standard Model: 2 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
- 09:00
- 09:20
- 09:40
- 10:00
- 10:20
-
09:00
→
11:00
Heavy Flavors: 5 - Charmonium production Forum 7
Forum 7
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich GermanyConvener: Michael Klasen (University of Grenoble)- 09:00
- 09:30
- 09:50
- 10:20
-
09:00
→
11:00
Hadronic Final States and QCD: 5 Kopenhagen & Zürich (Holiday Inn)
Kopenhagen & Zürich
Holiday Inn
- 09:00
- 09:20
- 09:40
- 10:00
- 10:20
- 10:40
-
09:00
→
10:40
Structure Functions and Low-x: 5 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 09:00
-
09:20
Forward jet production in DIS 20m.Speaker: Lev Khein (Moscow State University)
- 09:40
- 10:00
- 10:20
-
10:40
→
11:10
Coffee/Tea 30m Foyer Großer Saal and Forum 4&5 (Holiday Inn)
Foyer Großer Saal and Forum 4&5
Holiday Inn
-
11:10
→
12:50
Electroweak Measurements (Including Top) and Beyond the Standard Model: 3 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
- 11:10
- 11:30
- 11:50
- 12:10
- 12:30
-
11:10
→
12:50
Joint: Heavy Flavors / Diffraction and Vector Mesons: HFL-6 / DIFF-6 Forum 8 (Holiday Inn)
Forum 8
Holiday Inn
- 11:10
- 11:30
- 11:50
- 12:10
- 12:30
-
11:10
→
12:50
Structure Functions and Low-x: 6 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 11:10
- 11:30
- 11:50
- 12:10
- 12:30
-
11:10
→
12:50
Spin Physics: 5 Forum 7
Forum 7
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich Germany-
11:10
Measurement of transverse lambda polarization in quasi-real photoproduction at HERMES 20mTransverse Lambda and Lambda-bar polarization produced inclusively in quasi-real photon-nucleon scattering have been studied in the HERMES experiment using a 27.6 GeV positron beam incident on hydrogen and deuterium gas targets. The average transverse polarizations were found to be P^{Lambda}_n = 0.078 +- 0.006(stat) +- 0.012(syst) and P^{bar Lambda}_n = -0.025 +- 0.015(stat) +-0.018 (syst) for Lambda and barLambda, respectively. The dependence of P^{Lambda}_n on the transverse and longitudinal momenta of the Lambda hyperon has been studied.Speaker: Yury Naryshkin (Petersburg Nuclear Physics Institute)
-
11:30
Transverse spin phenomena in polarized p+p collisions at PHENIX 20mWith recent experimental measurements of various asymmetries at HERMES[1], Belle[2], STAR[3], and BRAHMS[4] there has been a growing interest in the understanding of the transversely polarized proton structure. Theoretical explanations include different mechanisms, such as effects from the Sivers function, the Collins effect, higher twist contributions, or combinations of all of the above. In order to quantify contributions from competing mechanisms, measurements over a wide range of p_T and x_F are needed. PHENIX, one of the two large experiments the Relativistic Heavy Ion Collider (RHIC), has accumulated a substantial transversely polarized data set over the last few years. Measurements include inclusive single spin asymmetries at mid-rapidities at sqrt{s} = 200 GeV [5]. In 2006, new data sets of 2.7 pb^{-1} at srqt{s} = 200 GeV and 20 nb^{-1} at sqrt{s} = 62.4 GeV have been taken. A new calorimeter at large rapidity installed during the 2006 run allows PHENIX to measure an even broader spectrum of the probes proposed to help disentangle contributions from the various theoretical models. We present the status of the PHENIX measurements and how they can help to lead to a deeper understanding of the transverse proton spin structure. 1. A. Airapetian et al., Phys. Rev. Lett. 94, (2005) 012002. 2. R. Seidl et al., Phys. Rev. Lett. 96 (2006) 232002. 3. J. Adams et al., Phys. Rev. Lett. 92 (2004) 171801. 4. F. Videbaek et al., AIP Conf. Proc. 792 (2005) 993. 5. S.S. Adler et al., Phys. Rev. Lett. 95 (2005) 202001.Speaker: K. Oleg Eyser (UC Riverside, DESY)
-
11:50
Measurement of transverse spin effects with the forward pion detector at STAR in polarized p+p collisions at 200GeV 20mSpeaker: Steven Heppelmann (Penn State)
-
12:10
Cross-sections and SSAs at high-xF at RHIC by BRAHMS 20mSingle transverse spin asymmetries (SSA) in transversely polarised pp reactions at the energy regime where pQCD is applicable are expected to be negligibly small in the lowest-oredr QCD approximation, whereas experimentally large SSAs have been observed at high xF. Recently, new measurements of SSAs have been available from semi-inclusive deep-inelastic scattering and transversely polarised pp at RHIC providing more insight into th e fundamental mechanisms of SSAs as well as the relevant hadron structure. The BRAHMS experiment at RHIC has unique capabilities to explore the high xF kinematic region with particle identification. Measurements of cross sections and single-spin asymmetries of identified charged hadrons from transversely polarised proton collisions at sqrt(s)=62.4 and 200 GeV are presented. The results are discussed in the context of theoretical models based on pQCD. The energy and flavour dependent SSAs combined with the cross sections at high xF bring new insight into the pQCD description of partonic dynamics at RHIC.Speaker: J.H. Lee (BNL)
-
12:30
Transverse spin structure of hadrons from lattice QCD 20mIn this talk, we present recent results from lattice QCD on the transverse spin structure of hadrons. Strong correlations between spin, orbital angular momentum and coordinate degrees of freedom lead to strongly distorted densities of quarks in hadrons in particular for transverse quark polarizations. We discuss possible implications of our results for the Sivers and Boer-Mulders function of the nucleon and show first results on the spin structure of the pion.Speaker: Philipp Haegler (TU Muenchen)
-
11:10
-
11:20
→
13:00
Hadronic Final States and QCD: 6 Kopenhagen & Zürich (Holiday Inn)
Kopenhagen & Zürich
Holiday Inn
- 11:20
- 11:40
- 12:00
- 12:20
- 12:40
-
12:50
→
14:00
Lunch 1h 10m Forum 1 and Restaurant (Holiday Inn)
Forum 1 and Restaurant
Holiday Inn
-
14:00
→
15:40
Joint: Diffraction and Vector Mesons / Spin Physics: DIFF-7 / SPIN-6 Forum 8 (Holiday Inn)
Forum 8
Holiday Inn
-
14:00
Exclusive meson production at NLO 20mI present a detailed study of exclusive meson production at large Q^2 in terms of generalized parton distributions, focusing at the effect of the NLO corrections to the hard scattering. Numerical investigations are performed for the kinematic regions of various experiments (from HERA collider to JLAB energies). I comment on the stability of the perturbative expansion in collinear factorization for this process.Speaker: Markus Diehl (DESY)
-
14:20
Obtaining generalized parton distributions from hadronic observables and lattice QCD 20mWe propose a physically motivated parametrization for the unpolarized Generalized Parton Distributions (GPDs), H and E, valid at both zero and non-zero values of the skewness variable, zeta. We start from a detailed study of the zeta = 0 case where H and E are determined using constraints from simultaneous fits of experimental data on both the nucleon elastic form factors and the deep inelastic structure functions [1]. Lattice calculations of the higher moments of GPDs [2,3] allow us in principle to constrain the parametrization at zeta > 0. Since lattice calculations are at present limited to large quark masses, we extrapolate to the chiral limit by using the technique devised in [4] to obtain the nucleon form factor dipole masses. We then perform a reconstruction of the GPDs using Bernstein polynomials. The inclusion in our fit, of recent precise Jefferson Lab data on Deeply Virtual Compton Scattering [5] is also discussed. Our method provides an alternative to the mathematical ansatz of double distributions in that GPDs are generated from direct constraints from experimental data combined with lattice calculations. [1] S. Ahmad, H. Honkanen, S. Liuti and S. K. Taneja, submitted to Phys.Rev. D, arXiv:hepph/ 0611046. [2] M. Gockeler et al. [QCDSF Collaboration], Phys. Lett. B 627, 113 (2005). [3] P. Hagler, J. Negele, D. B. Renner, W. Schroers, T. Lippert and K. Schilling [LHPC collaboration], Phys. Rev. D 68, 034505 (2003). [4] J. D. Ashley, D. B. Leinweber, A. W. Thomas and R. D. Young, Eur. Phys. J. A 19, 9 (2004) [5] C. Munoz Camacho et al. [Jeㄦson Lab Hall A Collaboration], arXiv:nucl-ex/0607029. [6] F. J. Yndurain, Phys. Lett. B 74, 68 (1978).Speaker: Simonetta Liuti (University of Virginia)
-
15:00
Transverse target spin asymmetries of exclusive rho0 mesons at HERMES 20mHard exclusive meson production in deep inelastic lepton scattering provides access to the unknown Generalized Parton Distributions (GPDs) of the nucleon. GPDs parameterize the nucleon structure and provide a unified description of exclusive and inclusive reactions. Predictions based on a GPD model have shown that the transverse target spin asymmetry of exclusive $\rho^0$ mesons is sensitive to the GPD $E$, and thus, to the total angular momentum of quarks. Hence, this transverse target spin asymmetry is a key observable to study the contribution of the orbital angular momentum of quarks to the spin of the proton. This talk will report on the preliminary measurement of the transverse target spin asymmetry of exclusive $\rho^0$ mesons on a polarized hydrogen target at HERMES using the $27.6$ GeV HERA positron beam. Since the factorization theorem is proved for longitudinally polarized photons only, a matter of theoretical interest is the asymmetry of $\rho^0$ mesons induced from longitudinal photons. The $\rho^0$ electroproduction data supports the fact that the $s$-channel helicity conservation holds to a good accuracy. This implies that a longitudinally polarized vector meson originates from a longitudinal polarized photon. Assuming the $s$-channel helicity conservation, the longitudinal polarization component of the $\rho^0$ production is obtained experimentally through its decay angular distribution. For the first time the longitudinal component of the transverse target spin asymmetry of exclusive $\rho^0$ mesons will be presented and compared to theoretical calculations.Speaker: Armine Rostomyan (DESY)
-
15:20
Are generalized and transverse momentum dependent parton distributions related? 20mRecent work suggests a close relation between generalized and transverse momentum dependent parton distributions (TMDs), in particular for the so-called naive time-reversal odd TMDs. In the talk our present knowledge on this topic will be briefly summarized. Moreover, an extension of the existing work in the literature will be discussed.Speaker: Andreas Metz (Institut fuer Theoretische Physik II, Ruhr-Universitaet Bochum)
-
14:00
-
14:00
→
15:40
Electroweak Measurements (Including Top) and Beyond the Standard Model: 4 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
- 14:00
- 14:20
- 14:40
- 15:00
-
14:00
→
15:40
Future of DIS: 1 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 14:00
- 14:20
- 14:45
- 15:10
-
14:00
→
15:40
Hadronic Final States and QCD: 7 Kopenhagen & Zürich (Holiday Inn)
Kopenhagen & Zürich
Holiday Inn
- 14:00
- 14:20
-
14:40
Final results from HERMES on hadronization in nuclear environment 20mFinal results from HERMES on hadronization in nuclear environmentSpeaker: Zaven Akopov (Yerevan Physics Institute)
- 15:00
- 15:20
-
14:00
→
15:40
Structure Functions and Low-x: 7 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 14:00
- 14:20
- 14:40
- 15:00
- 15:20
-
15:40
→
16:10
Coffee/Tea 30m Forum Großer Saal and Forum 4&5 (Holiday Inn)
Forum Großer Saal and Forum 4&5
Holiday Inn
-
16:10
→
18:00
Joint: Diffraction and Vector Mesons / Spin Physics: DIFF-8 / SPIN-7 Forum 8 (Holiday Inn)
Forum 8
Holiday Inn
-
16:10
Measurement of coherent and incoherent DVCS at HERMES from nuclear targets 20mFor the first time, azimuthal beam-spin asymmetries have been measured in electroproduction of a hard exclusive photon on nuclei ranging from Deuterium to Xenon. The data were accumulated by the HERMES experiment at HERA/DESY in the years 1996-2004 by scattering the 27.6 GeV lepton beam off an internal gas target. The asymmetries of the coherent and incoherent processes for D, 4He, N, Ne, Kr and Xe have been extracted and compared to the proton beam-spin asymmetry as a function of the Mandelstam variable $t$. The dependence on the atomic number $A$ of the ratio of the beam-spin asymmetry on nuclei to that on the proton is evaluated and compared to GPD model predictions.Speaker: Hayg Guler (DESY)
-
16:30
HERMES measurement of DVCS from p and d targets, and status and prospects of the recoil detector 25mHard exclusive processes provide access to the unknown generalized parton distributions (GPDs), which extend our description of the nucleon structure beyond the standard parton distributions. The Deeply Virtual Compton Scattering (DVCS) process, i.e. the hard exclusive leptoproduction of real photons, provides the theoretically cleanest access to the GPDs. DVCS amplitudes can be measured most readily through the interference between the Bethe-Heitler process and the DVCS process. Azimuthal cross-section asymmetries are generated by both the real and imaginary parts of the DVCS amplitude with respect to the charge and helicity of the incoming lepton, and with respect to the spin polarization of the target, either longitudinal or transverse with respect to the lepton beam. The accumulated HERMES data offers access to all of these spin and charge degrees of freedom, and the combined set of asymmetry measurements allows independent access to the four GPDs in different combinations. An overview of these results will be presented. In particular, a recent highlight has been the measurement of the DVCS azimuthal asymmetry using a transversely-polarized hydrogen target. This particular asymmetry is sensitivite to the GPD $E$, related via the Ji sum rule to the total angular momentum of quarks within the proton. By comparing the HERMES result and the theoretical predications based on the GPD model, a model-dependent constraint on $J_u$ and $J_d$ has been obtained. In late 2005, a Recoil Detector was installed at HERMES with the purpose of greatly improving the experiment's ability to measure hard-exclusive processes during its final running period. The status of this detector's operation and commissioning will be presented, along with rojections for the expected results.Speaker: Andreas Mussgiller (University of Erlangen)
-
16:55
DVCS in Hall A 25mI would like to bring your attention on the Hall A exprimental program about GPDs at JLab. Two experiments have been recently performed investigating GPDs via the DVCS reaction off the proton and off the neutron. They involve the HRS spectrometer for the detection of the scattered electron and a new PbF2 calorimeter for the detection of the emitted photon. The latter was specially designed to sustain luminosities of 4.10^37 cm^-2/s in the direct vicinity of the target, and at small angles. The difference between cross sections for opposite longitudinal polarization of the electron beam and the unpolarized cross secttion have been measured. The experiment on the proton provided strong indication supporting factorization at Q^2 as low as 2 GeV^2, therefore validating a GPD based analysis. The unpolarized cross section data provided evident deviations from the Bethe-Heitler cross section, leading to an integral measurement of GPDs. The experiment on a deuterium target provided first measurements of the DVCS off the neutron, particularly sensitive to the least know GPD E, and the DVCS off the deuton.Within a model dependent analysis, these data provide constraints on the u- and d-quark angular momentum.Speaker: Eric Voutier (LPSC / Université Joseph Fourier)
-
17:20
Double spin asymmetry for exclusive pi+ production 20mThe eg1b run was conducted using CLAS (CEBAF Large Acceptance Spectrometer) at the Thomas Jeㄦson National Accelerator Facility (TJNAF) in 2000 by the CLAS collaboration. A 1.6 GeV - 5.6 GeV polarized electron beam and polarized nuclear targets (composed of NH3 and ND3) were used, allowing single and double spin asymmetries to be measured. This analysis is of the double spin asymmetry Ajj in the exclusive production of positive pions from a polarized proton (ep -> e pi+ n). The double spin asymmetry was measured as a function of the four kinematic variables W, Q2, cos Theta* (the angle between the lepton interaction plane and the hadron interaction plane). The value of this asymmetry can be used to help determine the spin structure of the resonances, due to its sensitivity to the spin dependent parts of the cross section. A brief description of the experimental setup will be given, and preliminary results for the asymmetry will be shown.Speaker: Josh Pierce (University of Virginia)
-
16:10
-
16:10
→
18:00
Electroweak Measurements (Including Top) and Beyond the Standard Model: 5 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
- 16:10
- 16:30
- 16:50
- 17:10
- 17:35
-
16:10
→
18:00
Future of DIS: 2 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 16:10
- 16:25
- 16:55
- 17:15
- 17:40
-
16:10
→
18:00
Hadronic Final States and QCD: 8 Kopenhagen & Zürich (Holiday Inn)
Kopenhagen & Zürich
Holiday Inn
- 16:10
- 16:30
- 16:50
- 17:10
-
17:30
Structural relations between Harmonic Sums up to w=6 and representation of higher order splitting and coefficient functions 20mStructural relations between Harmonic Sums up to w=6 and representation of higher order splitting and coefficient functionsSpeaker: Johannes Blümlein (Desy Zeuthen)
-
16:10
→
18:10
Structure Functions and Low-x: 8 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 16:10
- 16:30
- 16:50
- 17:10
- 17:30
- 17:50
-
18:15
→
18:45
Special Session Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
-
18:15
Airbus A380 20m Forum 2&3
Forum 2&3
Holiday Inn
-
18:15
-
18:15
→
19:00
Heavy Flavors: Charm Mass Forum 6
Forum 6
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich Germany -
19:30
→
23:00
Conference Dinner 3h 30m Luftfahrthalle (Deutsches Museum)
Luftfahrthalle
Deutsches Museum
-
08:00
→
09:00
-
-
08:00
→
09:00
Breakfast 1h Foyer Großer Saal & Forum 4&5 (Holiday Inn)
Foyer Großer Saal & Forum 4&5
Holiday Inn
-
09:00
→
10:40
Diffraction and Vector Mesons: 9 Forum 8 (Holiday Inn)
Forum 8
Holiday Inn
- 09:00
- 09:20
- 09:40
- 10:00
-
10:20
Discussion 20m
-
09:00
→
11:00
Electroweak Measurements (Including Top) and Beyond the Standard Model: 6 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
- 09:00
- 09:20
- 09:40
- 10:00
- 10:20
-
09:00
→
10:40
Future of DIS: 3 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 09:00
- 09:20
- 09:50
- 10:10
-
09:00
→
10:35
Heavy Flavors: 7 - Beauty cross section Kopenhagen & Zürich
Kopenhagen & Zürich
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich GermanyConvener: Benno List (University of Hamburg)- 09:00
- 09:35
- 09:55
- 10:15
-
09:00
→
10:40
Spin Physics: 8 Forum 7
Forum 7
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich Germany-
09:00
Soft gluon resummation and a novel asymptotic formula for double-spin asymmetries in dilepton production at small transverse momentum 20mWe study the double-spin asymmetries in transversly/longitudinally polarized Drell-Yan processes at transverse momentum Q_T of the produced lepton pair. We first consider the double transverse-spin asymmetry A_{TT}(Q_T) in the transversely polarized Drell-Yan process in detail, in particular, in the small Q_T region, where the bulk of dileptons are produced. The large logarithms due to the soft gluon emission at small Q_T are resummed in the Drell-Yan cross sections at the next-to leading logarithmic (NLL) accuracy, employing the impact parameter b-space formulation. The numerical calculation shows that the effects of the soft gluon resummation to the polarized and unpolarized cross sections largely cancel in A_{TT}(Q_T), but the significant corrections still remain. In particular, as a result of the resummaiton, the flat behavior of A_{TT}(Q_T) is generically observed in the small Q_T region, from Q_T =0 to the peak region of the cross-section Q_T-spectrum, indicating that the Q_T =0 limit of A_{TT}(Q_T) is theoretically a useful quantity. We evaluate the impact parameter b-integral in the resummed cross sections at Q_T=0 by the saddle-point method, and derive a novel asymptotic formula of A_{TT}(Q_T =0), which obeys a remarkably simple analytic form and is exact when the dilepton mass Q is large. We demonstrate the accuracy of our asymptotic formula even at the kinematics of RHIC, J-PARC, and GSI, comparing with the corresponding results of the numerical calculation. Because of the simple structure of our formula, it enables us to extract information on the transversity directly from the data of A_{TT}(Q_T) measured in polarized Drell-Yan processes in the small Q_T region. We also extend our framework to the double-spin asymmetry A_{LL}(Q_T) in the longitudinally polarized Drell-Yan process in the small Q_T region, and derive the corresponding asymptotic formula for A_{LL}(Q_T =0), and discuss its usefulness for extracting the information on the helicity distributions of quarks and gluons inside nucleon.Speaker: Hiroyuki Kawamura (RIKEN)
-
09:20
Factorization and gauge invariance of the twist-3 cross-section for single spin asymmetry 20mWe present a consistent framework for the twist-3 calculation for the single transverse spin asymmetry (SSA). We prove that the consistent use of the Ward identity for color gauge invariance is crutial to obtain the factorization property and the gauge invariance of the twist-3 single-spin-dependent cross section. This proof had been missed in the previous literature. As an application, we present a complete twist-3 cross section formula for SSA for semi-inclusive deep inelastic scattering in terms of the complete set of the twist-3 quark-gluon distributions which include all kinds of pole (soft-gluon-pole, soft-fermion-pole and hard-pole) contributions. We will also make a comment on the connection between the twist-3 approach and the Sivers function approach to SSA. The detail is reported in our recent paper Nucl.Phys.B763:198-227,2007 [HEP-PH 0610314].Speaker: Prof. Yuji Koike (Department of Physics, Niigata University)
-
09:40
Novel master formula for twist-3 soft-gluon-pole mechanism to single transverse-spin asymmetry 20mIt is known that a dominant QCD mechanism for the single transverse-spin asymmetry in hard processes is induced by the twist-3 quark-gluon correlations inside a hadron, combined with the soft-gluonic poles to produce the interfering phase for the associated partonic hard scattering. We show that the coupling of the relevant soft gluon to partonic subprocess can be systematically disentangled, so that the corresponding interfering amplitude can be calculated entirely in terms of the partonic cross section for 2-to-2 Born subprocess which participates in the twist-2 cross section formula. We establish a new formula that represents the exact rules to derive the SSA due to soft-gluon poles from the knowledge of the twist-2 cross section formula. This master formula is applicable to a range of processes like Drell-Yan and direct-photon production, and pion production in semi-inclusive deep inelastic scattering and in pp collisions. The detail is reported in our recent paper HEP-PH 0612117.Speaker: Prof. Kazuhiro Tanaka (Dept. of Physics, Juntendo University)
-
10:00
The role of gauge invariance in single-spin asymmetries 20mThe Sivers effect is a possible source for many single spin asymmetries. The appearance of the Sivers distribution function is also a testinground for our understanding of universality. A well-known example of the peculiar universality property of this function is the relative sign difference of the Sivers function in SIDIS and Drell-Yan scattering. This opposite sign is a direct consequence of the initial or final state interactions that give rise to the future (SIDIS) and past (Drell-Yan) pointing Wilson lines in the Sivers distribution function. The Wilson lines are path-ordered exponentials with process-dependent integration paths in the case of transverse momentum dependent functions. When going beyond the basic electromagnetic scattering processes these Wilson lines can become quite complicated structures. In turn, this observation has consequences on the universality of the transverse momentum dependent Sivers functions, that are still today not fully understood. However, the complicated Wilson lines also have well-defined consequences for the transverse moment of the Sivers function. In particular, they lead to precise predictions for certain single-spin asymmetries of which experimental verification or falsification would test our understanding of the underlying principles. We will present two such observables, i.e. specific weighted azimuthal asymmetries in hadronic back-to-back jet or photon+jet production.Speaker: Cedran Bomhof (Vrije Universiteit Amsterdam)
- 10:20
-
09:00
-
10:40
→
11:10
Coffee/Tea 30m Foyer Großer Saal and Forum 4&5 (Holiday Inn)
Foyer Großer Saal and Forum 4&5
Holiday Inn
-
11:10
→
12:55
Diffraction and Vector Mesons: 10 Forum 8 (Holiday Inn)
Forum 8
Holiday Inn
- 11:10
-
11:25
Status of forward physics projects at ATLAS 20mThe ATLAS experiment at the LHC is building several detector systems for forward physics studies and to determine the luminosity. The main forward systems consist of a Cerenkov detector called LUCID, a Zero Degree Calorimeter (ZDC) and Roman Pots which initially will house a scintillating fiber tracker system called ALFA. This presentation will describe the foreseen forward physics activities in ATLAS together with the status of the related detector systems. The detector performance obtained from beam tests both at DESY and at CERN will be presented and the final steps to completion will be outlined.Speaker: Stefan Ask (CERN)
- 11:45
- 12:05
- 12:20
-
11:10
→
12:50
Electroweak Measurements (Including Top) and Beyond the Standard Model: 7 Forum 6 (Holiday Inn)
Forum 6
Holiday Inn
- 11:10
-
11:30
Quaero@H1: An interface to high-pT HERA event data 20mDistributions from high-pT HERA event data analyzed in a general search for new physics at H1 have been incorporated into Quaero, an algorithm designed to automate tests of specific hypotheses with high energy collider data. The use of Quaero@H1 to search for leptoquarks, R-parity violating supersymmetry, and excited quarks provides examples to develop intuition for the algorithm's performance.Speaker: Sascha Caron (University of Freiburg)
- 11:50
- 12:10
- 12:30
-
11:10
→
12:50
Future of DIS: 4 Forum 2&3 (Holiday Inn)
Forum 2&3
Holiday Inn
- 11:10
- 11:35
- 12:00
-
11:10
→
12:40
Heavy Flavors: 8 - Heavy flavor prospects at future colliders Kopenhagen & Zürich
Kopenhagen & Zürich
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich GermanyConvener: Stephanie Hansmann-Menzemer (University of Heidelberg)- 11:10
- 11:40
- 12:10
-
11:10
→
12:50
Spin Physics: 9 Forum 7
Forum 7
Holiday Inn Munich City Centre & Gasteig Conference Center
Hochstrasse 3 81669 Munich Germany-
11:10
Transverse momentum in semi-inclusive DIS 20mThe cross section for polarized semi-inclusive deep inelastic scattering is reviewed, including in particular the dependence on the transverse momentum of the detected hadron. Out of the 18 structure functions appearing in the cross section, we will discuss the present knowledge of a few selected examples.Speaker: Alessandro Bacchetta (DESY)
-
11:30
Transversity signals in two-hadron production in COMPASS 20mAn important missing piece in our understanding of the spin structure of the nucleon is the transversity distribution function Delta_Tq(x). It is only one of the three leading-twist quark distribution functions q(x), Delta q(x) and Delta_Tq(x) that so-far remains unmeasured. The function Delta_Tq(x) describes the distribution of transversely polarized quarks in a transversely polarized nucleon. It is difficult to measure Delta_Tq(x), since it is a chiral-odd function which can only be probed in combination with another chiral-odd function. One suggested probe to access transversity is the measurement of two-hadron production in semi-inclusive deep-inelastic scattering on a transversely polarized target. In this case, transversity is accessible via the chiral-odd two-hadron interference fragmentation function H_1^\sphericalangle(z,M_h^2). The COMPASS experiment has measured target single-spin asymmetries in semi-inclusive production of hadron pairs. The data presented have been taken scattering a 160 GeV muon beam off a transversely polarized deuterium target. The scattered hadrons have been identified as pions and kaons using the information of a ring imaging Cherenkov detector. The azimuthal asymmetries are presented as a function of the invariant mass of the hadron pairs and in dependence of the kinematic variables x_{Bj} and z.Speaker: Christian Schill (Univ. Freiburg)
-
11:50
Evolution equations for dihadron fragmentation functions 20mWe consider dihadron fragmentation functions, that describe the fragmentation of a parton in two (unpolarized) hadrons. Using Jet calculus techniques, we develop evolution equations when these functions are explicitly depending upon the invariant mass of the produced hadron pair, the socalled extended dihadron fragmentation functions. We connect our results to the integrated dihadron fragmentation functions and we establish a formal correspondence with the (extended) fracture functions in the space-like domain. Our results can be used in the analysis of (spin) asymmetries in the azimuthal distribution of final pion pairs, particularly for semi-inclusive deep-inelastic scattering on transversely polarized targets, where extended dihadron fragmentation functions represent a convenient analyzing power to extract the quark transversity distribution.Speaker: Marco Radici (INFN - Sezione Pavia)
-
12:10
Beyond Collins and Sivers: further measurements of the target transverse spin-dependent azimuthal asymmetries in semi-inclusive DIS from COMPASS 20mIn semi-inclusive DIS of polarized leptons on a transversely polarized target eight azimuthal modulations appear in the cross-section. Within QCD parton model four azimuthal asymmetries can be interpreted at leading order, two of them being the already measured Collins and Sivers asymmetries. The other two leading twist asymmetries, related to different transverse momentum dependent quark distribution functions, and also additional four asymmetries which can be interpreted as twist-three contributions have been measured from the COMPASS data, using a 160 GeV/c longitudinally polarized muon beam and a transversely polarized ^6LiD target. The preliminary results from the 2002-2004 data are presented here for the first time.Speaker: Aram Kotzinian (INFN Torino)
-
12:30
Studying proton spin structure with the PHENIX upgrade program 20mThe PHENIX upgrade program adds a set of silicon pixel detectors (the VTX and FVTX), forward calorimetry (the NCC), and Level-1 trigger detectors (the Muon Trigger Upgrade) to the baseline detector. These upgrades will enhance the ability of PHENIX to pursue a rich program of spin physics in polarized proton collisions, in particular at sqrt(s) = 500 GeV. The VTX and FVTX detectors will provide a larger x range over which the gluon polarization (Delat-G/G) can be determined and allow for a direct measurement of spin asymmetry in beauty production. The Nosecone Calorimeter will provide high-segmentation electromagnetic calorimetry at high rapidity to open a wide variety of channels through measurements of photons and electrons. It will also provide improved constraints on parton kinematics. The Muon Trigger Upgrade will allow the experiment to select high momentum muons from the decay of W bosons and reject both beam-associated and low-momentum collision background, enabling the study of quark and antiquark polarization in the proton trough the use of parity violating (single longitudinal spin) asymmetries. The combination of all three of these upgrades enable a complementary, comprehensive physics program. In many cases these upgrades will work together to improve the quality of physics measurements and reduce backgrounds. I will describe the various components of the upgrades, their implementation, and the expected sensitivity for a variety of spin-related measurements.Speaker: John Lajoie (Iowa State University)
-
11:10
-
12:50
→
14:00
Lunch 1h 10m Forum 1 and Restaurant (Holiday Inn)
Forum 1 and Restaurant
Holiday Inn
-
14:00
→
18:00
Excursions 4h
-
08:00
→
09:00
-
-
08:00
→
09:00
Breakfast 1h Foyer Großer Saal and Forum 4&5 (Holiday Inn)
Foyer Großer Saal and Forum 4&5
Holiday Inn
-
09:00
→
10:30
Plenary Session Carl-Orff-Saal (Gasteig)
Carl-Orff-Saal
Gasteig
- 09:00
- 09:45
-
10:30
→
11:00
Coffee/Tea 30m Foyer Carl-Orff-Saal (Gasteig)
Foyer Carl-Orff-Saal
Gasteig
-
11:00
→
12:30
Plenary Session Carl-Orff-Saal (Gasteig)
Carl-Orff-Saal
Gasteig
- 11:00
- 11:45
-
12:30
→
14:00
Lunch 1h 30m Forum 1 and Restaurant (Holiday Inn)
Forum 1 and Restaurant
Holiday Inn
-
14:00
→
15:30
Plenary Session Carl-Orff-Saal (Gasteig)
Carl-Orff-Saal
Gasteig
-
14:00
Hadronic Final States and QCD: Session Summary 45m Carl-Orff-Saal
Carl-Orff-Saal
Gasteig
Speakers: Alexander Savin (University of Wisconsin,Madison), Giulia Zanderighi (CERN) -
14:45
Heavy Flavors: Session Summary 45m Carl-Orff-Saal
Carl-Orff-Saal
Gasteig
Speakers: Benno List (Hamburg), Michael Klasen (Grenoble)
-
14:00
-
15:30
→
16:00
Coffee/Tea 30m Foyer Carl-Orff-Saal (Gasteig)
Foyer Carl-Orff-Saal
Gasteig
-
16:00
→
17:45
Plenary Session Carl-Orff-Saal (Gasteig)
Carl-Orff-Saal
Gasteig
-
16:00
Spin Physics: Session Summary 45m Carl-Orff-Saal
Carl-Orff-Saal
Gasteig
Speakers: Daniel Boer (Amsterdam), Delia Hash (Frascati)Slides - 16:45
- 17:30
-
16:00
-
08:00
→
09:00