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Prof. Konstantin Goulianos (The Rockefeller University)28/04/2015, 08:30WG2 Small-x, Diffraction and Vector MesonsPredictions of diffractive, total, and total-inelastic cross sections at the LHC, based on the pre-LHC renormalization model of diffraction RENORM, are reviewed and compared with the latest experimental results. RENORM is found to be in reasonable agreement with all aspects of the data and is extended to include predictions for the upcoming LHC run at 13 TeV.Go to contribution page
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Grzegorz Brona (University of Warsaw (PL))28/04/2015, 08:55WG2 Small-x, Diffraction and Vector MesonsThe differential diffractive cross section is measured as a function of xi= M_X^2/s in the region dominated by single dissociation (SD) and double dissociation (DD), where M_X is the mass of one of the two final-state hadronic systems separated by the largest rapidity gap in the event. The cross section is also measured as a function of the width of the central rapidity gap in the region...Go to contribution page
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Dr Mario Deile (CERN)28/04/2015, 09:20WG2 Small-x, Diffraction and Vector MesonsWe present the final results on low-$|t|$ elastic proton-proton scattering at $\sqrt{s} = 8$ TeV based on two data sets acquired with different, dedicated beam-optics settings. A very high statistics sample allowed, for the first time at LHC energies, the exclusion of a purely exponential differential cross-section in the four-momentum range $0.027 < |t| < 0.2~\rm GeV^2$ with a significance...Go to contribution page
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Leszek Adamczyk (AGH University of Science and Technology (PL)), Leszek Adamczyk (AGH University of Science and Technology (PL))28/04/2015, 09:45WG2 Small-x, Diffraction and Vector MesonsThe total pp cross section is a fundamental parameter of the strong interaction which cannot be calculated in QCD but still can be measured using the optical theorem, which states that the total cross section can be obtained from the extrapolation to t=0 of the differential elastic cross section measured at small four-momentum transfer t. The ATLAS Collaboration has collected 80 mub-1 of...Go to contribution page
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Michael Albrow (Fermi National Accelerator Lab. (US))28/04/2015, 10:45WG2 Small-x, Diffraction and Vector MesonsThe CMS-TOTEM Precision Proton Spectrometer, CT-PPS, is an approved project to add 3D silicon tracking and quartz Cherenkov timing detectors in Roman pots at z = +/- 210 m from the CMS collision point to study final states p + X + p. The central state X can be a W-pair from photon-photon interactions, a set of high-ET jets from gluon collisions, among others, with M(X) obtained directly as...Go to contribution page
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Alex Kovner (UConn)28/04/2015, 11:10WG2 Small-x, Diffraction and Vector MesonsWe reconsider the perturbative next-to-leading calculation of the single inclusive hadron production in the framework of the hybrid formalism, applied to hadron production in proton-nucleus collisions. We introduce the explicit requirement that fast fluctuations in the projectile wave function which only exist for a short time are not resolved by the target. This Ioffe time cutoff also...Go to contribution page
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Piotr Kotko28/04/2015, 11:35WG2 Small-x, Diffraction and Vector MesonsWe study forward dijet production in dilute-dense hadronic collisions. By considering the appropriate limits, we show that both the transverse-momentum-dependent (TMD) and the high-energy factorization formulas can be derived from the Color Glass Condensate framework. Respectively, this happens when the transverse momentum imbalance of the dijet system, $k_t$, is of the order of either the...Go to contribution page
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Adrian Dumitru (Baruch College (City University of New York))28/04/2015, 12:00WG2 Small-x, Diffraction and Vector MesonsExperiments at RHIC and the LHC have revealed anisotropic multi-particle azimuthal correlations in high multiplicity pp and pA collisions. These correlations are long range in rapidity (resp. log 1/x) and extend to semi-hard transverse momenta of several GeV. I discuss first steps towards understanding azimuthal correlations from small-x QCD, and the information they could provide about...Go to contribution page
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Prof. Chung-I Tan (Brown University)28/04/2015, 14:00WG2 Small-x, Diffraction and Vector MesonsWe focus on a holographic approach to DIS at small-x in high energy where scattering is dominated by exchanging a Reggeized Graviton in $AdS_5$. We emphasize the importance of confinement, which corresponds to a deformation of $AdS_5$ geometry in the IR. This approach provides an excellent fit to the combined HERA data at small $x$. We also discuss the constraints of unitarity and...Go to contribution page
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Dr Stefan Schmitt (Deutsches Elektronen-Synchrotron (DE))28/04/2015, 14:25WG2 Small-x, Diffraction and Vector MesonsA measurement is presented of single- and double-differential dijet cross sections in diffractive deep-inelastic ep scattering at HERA using data collected by the H1 experiment corresponding to an integrated luminosity of 290 pb^{-1}. The investigated phase space is spanned by the photon virtuality in the range of 4< Q^{2} <100 GeV^{2} and by the fractional proton longitudinal momentum loss...Go to contribution page
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Dr Stefan Schmitt (Deutsches Elektronen-Synchrotron (DE))28/04/2015, 14:50WG2 Small-x, Diffraction and Vector MesonsThe cross section of the diffractive process e^+p -> e^+Xp is measured at a centre-of-mass energy of 318 GeV, where the system X contains at least two jets and the leading final state proton p is detected in the H1 Very Forward Proton Spectrometer. The measurement is performed in photoproduction with photon virtualities Q^2 <2 GeV^2 and in deep-inelastic scattering with 4 GeV^2< Q^2 <80 GeV^2....Go to contribution page
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Leszek Adamczyk (Cracow AGH-UST), Leszek Adamczyk (AGH University of Science and Technology (PL))28/04/2015, 15:15WG2 Small-x, Diffraction and Vector MesonsThe exclusive dijet production in diffractive deep inelastic $e^\pm p$ scattering has been measured with the ZEUS detector at HERA using an integrated luminosity of 372 pb$^{โ1}$. The measurement was performed for $\gamma^*-p$ centre-of-mass energies in the range $90 < W < 250$ GeV and photon virtualities in the range $Q^2$ > 25 GeV$^2$ . Energy and transverse-energy flows around the jet axis...Go to contribution page
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Michal Praszalowicz (Jagellonian University, Krakow)28/04/2015, 16:15WG2 Small-x, Diffraction and Vector MesonsGluon distrubutions of colliding hadrons saturate as a consequence of non-linear evolution equations of QCD. Saturation implies the existence of the so called saturation momentum, which is related to the gluon density per unit rapidity per transverse area. At large energies in some regions of phase space the saturation momentum is the only scale for physical processes. As a...Go to contribution page
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Martin Hentschinski (Institute for Nuclear Science, UNAM)28/04/2015, 16:40WG2 Small-x, Diffraction and Vector MesonsWe present the results for the calculation of the forward jet vertex associated to a rapidity gap (coupling of a hard pomeron to the jet) in the Balitsky-Fadin-Kuraev-Lipatov (BFKL) formalism at next-to-leading order (NLO). We handle the real emission contributions making use of the high energy effective action proposed by Lipatov, valid for multi-Regge and quasi-multi-Regge kinematics. This...Go to contribution page
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Amir Rezaeian (Universidad Tecnica Federico Santa Maria)28/04/2015, 17:05WG2 Small-x, Diffraction and Vector MesonsI will discuss that diffractive production at small-x, including diffractive photo production of vector mesons and dijet can be a powerful probe of non-linear gluon-saturation dynamics [1,2]. In particular, I will focus on the diffractive dijet production at HERA and the LHC within the color-glass-condensate approach [2]. I will show that the t-distribution of photoproduction of dijet and...Go to contribution page
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Prof. Kirill Tuchin (Iowa State University)28/04/2015, 17:30WG2 Small-x, Diffraction and Vector MesonsI calculate the Coulomb corrections to the total and diffractive cross sections in DIS off heavy nuclei. I show that they violate the geometric scaling and have important phenomenological implications for a future EIC program.Go to contribution page
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Joakim Nystrand (University of Bergen (NO))29/04/2015, 08:30WG2 Small-x, Diffraction and Vector MesonsParticle production through photon-induced processes in ultra-peripheral collisions has attracted an increasing interest following the first heavy-ion runs at the CERN Large Haron Collider. The increased collision energy compared with the Relativistic Heavy-Ion Collider (RHIC) at BNL implies that also heavy final states can be produced in abundance. The focus has so far been on...Go to contribution page
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Maria Beatriz Gay Ducati (UFRGS)29/04/2015, 08:55WG2 Small-x, Diffraction and Vector MesonsRecent results for the coherent photoproduction of vector mesons psi(1S), psi(2S) and Upsilon (1S) in the hadron-hadron and nucleus-nucleus collisions in the LHC energies are presented. Predictions for the rapidity distributions are obtained using the color dipole formalism and including saturation effects, expected to be relevant at high energies. Comparison is done to the J/psi and Psi(2S)...Go to contribution page
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Michael Murray (University of Kansas (US))29/04/2015, 09:20WG2 Small-x, Diffraction and Vector MesonsThe nature of the initial state can be studied in photon-nucleus collisions at the LHC. Ultra-peripheral collisions (UPCs) of heavy ions involve long range electromagnetic interactions at impact parameters larger than twice the nuclear radius. At TeV energies, the strong electromagnetic field due to the coherent action of the Z=82 proton charges generates a large flux of photons, which can be...Go to contribution page
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Jaroslav Adam (Czech Technical University (CZ))29/04/2015, 09:45WG2 Small-x, Diffraction and Vector MesonsUltra-relativistic heavy ions generate strong electromagnetic fields, which offer the possibility to study gamma-gamma, gamma-nucleus and gamma-proton processes at the LHC in ultra-peripheral Pb-Pb and p-Pb collisions (UPC). Exclusive photoproduction of vector mesons is sensitive to the gluon distribution of the interacting target (proton or nucleus). The reactions allow one to study...Go to contribution page
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Prof. Thomas Ullrich (BNL)29/04/2015, 10:45WG2 Small-x, Diffraction and Vector MesonsThe demand for detailed simulations of diffractive processes at an electron-ion collider (EIC) required the realization of an event generator that described these processes not only in ep but especially also in eA. Since gluon saturation is one of the key topics in eA collisions at an EIC, the generator was also required to be able to describe these non-linear QCD phenomena but also be able...Go to contribution page
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Nataliia Kovalchuk (Hamburg University (DE))29/04/2015, 11:10WG2 Small-x, Diffraction and Vector MesonsThe exclusive deep inelastic electroproduction of $\psi(2S)$ and $J/\psi$ has been studied with the ZEUS detector at HERA in the kinematic range $2 \le Q^2 \le 80$ GeV$^2$, $30 \le W \le 210$ GeV and $|t| \le 1$ GeV$^2$, where $Q^2$ is the photon virtuality, $W$ is the photon-proton centre-of-mass energy and $t$ is the squared four-momentum transfer at the proton vertex. The data for $2 \le...Go to contribution page
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Ronan James Wallace (University College Dublin (IE))29/04/2015, 11:35WG2 Small-x, Diffraction and Vector MesonsThe recent LHCb results on central exclusive production are presented.Go to contribution page
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Dr Michael Albrow (Fermi National Accelerator Laboratory)29/04/2015, 12:00WG2 Small-x, Diffraction and Vector MesonsWe measure exclusive pi+pi- production in proton-antiproton collisions at center-of-mass energies sort(s) = 0.9 and 1.96 TeV in the Collider Detector at Fermilab. We select events with two oppositely charged particles, assumed to be pions, with pseudorapidity |eta| < 1.3 and with no other particles detected in |eta| < 5.9. We require the pi+pi- system to have rapidity |y| < 1.0. The...Go to contribution page
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Michael Lublinsky29/04/2015, 14:00WG2 Small-x, Diffraction and Vector MesonsWe present a construction of an effective high energy QCD Hamiltonian at NLO accuracy. This Hamiltonian is an NLO extension of the JIMWLK LO Hamiltonian, known to incorporate BFKL dynamics with gluon saturation phenomena. We are to demonstrate how the conformal symmetry is realized within the NLO JIMWLK.Go to contribution page
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Andrey Grabovskiy (Budker Institute of Nuclear Physics (RU))29/04/2015, 14:25WG2 Small-x, Diffraction and Vector MesonsThe next to leading order low x evolution equation for the next after the dipole operator will be discussed.Go to contribution page
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Dr Giovanni Chirilli29/04/2015, 14:50
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Dr Tuomas Lappi (Jyvaskyla U)29/04/2015, 15:15
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Madrigal Martรญnez Josรฉ Daniel (IPhT CEA Saclay)29/04/2015, 16:15WG2 Small-x, Diffraction and Vector MesonsStarting at NLO, the BFKL-BK evolution in high-energy QCD develops severe convergence problems. The most important source for this behavior can be traced down to large double collinear logarithms. We show via explicit computation of Feynman diagrams that corrections enhanced by double logs correspond to soft gluon emissions strongly ordered in lifetime, while other potential contributions...Go to contribution page
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Andrey Tarasov (Jefferson Lab)29/04/2015, 16:40WG2 Small-x, Diffraction and Vector MesonsA TMD factorization generalizes the usual concept of parton density by allowing PDFs to depend on intrinsic transverse momenta in addition to the usual longitudinal momentum fraction variable. The available analysis of TMD evolution is mostly restricted to the evolution of quark TMDs at moderate x. However at high collider energies the majority of produced particles will be small-x gluons. In...Go to contribution page
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Dr Peter Bussey (University of Glasgow)29/04/2015, 17:05WG2 Small-x, Diffraction and Vector MesonsUsing data from HERA, the ZEUS collaboration present measurements of the diffractive production of isolated ("prompt") photons in photoproduction, with and without a jet. First cross sections are evaluated for centrally produced photons with jets as a function of the photon and jet transverse energy and pseudorapidity, and also for the fraction of incoming photon energy imparted to the...Go to contribution page
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Anna Stasto (Penn State)30/04/2015, 08:30WG2 Small-x, Diffraction and Vector MesonsWe construct a theoretical framework to match the formulas for forward inclusive hadron productions in pA collisions in the small-x saturation formalism and collinear factorization. The small-x calculation can be viewed as a power series in Q2s/k2โฅ, in which the collinear factorization result corresponds to the leading term. At high transverse momentum, the subleading correction terms are...Go to contribution page
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Tolga Altinoluk (Universidade de Santiago de Compostela)30/04/2015, 08:55WG2 Small-x, Diffraction and Vector MesonsWe present a new method to systematically calculate corrections to the eikonal approximation in the background field formalism. We calculate the subleading power-suppressed corrections due to the finite width of the target to first and second orders. The method is of generic applicability. As a first example, we study both polarized and unpolarized gluon production in pA collisions.Go to contribution page
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Douglas Wertepny (The Ohio State University)30/04/2015, 09:20WG2 Small-x, Diffraction and Vector MesonsThe classical single-gluon production amplitude in nucleus-nucleus collisions including the first saturation correction in one of the nuclei (the projectile) while keeping multiple-rescattering (saturation) corrections to all orders in the other nucleus (the target) is presented. We expand one of the two nuclei up to two Wilson lines (i.e only two nucleons interact in the projectile...Go to contribution page
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Feng Yuan (LBNL)30/04/2015, 09:45WG2 Small-x, Diffraction and Vector MesonsIn this talk, we will discuss the theory developments on the next-to-leading order calculation for forward hadron production in pA collisions in the small-x factorization framework. In particular, we emphasize the matching between this calculation and the collinear factorization calculation at large transverse momentum. The small-x calculation can be viewed as a power series in $Q_s^2/k_T^2$,...Go to contribution page
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Dr Erez Reinherz-Aronis30/04/2015, 10:45WG2 Small-x, Diffraction and Vector MesonsThis talk will present recent results on neutrino interaction cross sections from the T2K experiment.Go to contribution page
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Jonathan Asaadi (Syracuse University), Jonathan Asaadi (urn:Google)30/04/2015, 11:10WG2 Small-x, Diffraction and Vector MesonsThe analysis and interpretation of the present and future neutrino oscillation experiments strongly rely on the quantitative understanding of neutrino and antineutrino interactions with nuclei in the "few GeV" energy range. With the advent of the Liquid Argon Time Projec- tion Chamber (LArTPC) experimental techniques for neutrino detection, a novel approach and methodology in neutrino data...Go to contribution page
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Dr Xinchun Tian (Univ. of South Carolina)30/04/2015, 11:35WG2 Small-x, Diffraction and Vector MesonsNew measurements of coherent ฯ0 and ฯ+ production in NOMAD are reported. We present simulation of neutrino induced coherent ฯ-meson production in charged and neutral current interactions. Sensitivity studies of this process for next generation neutrino scattering experiments is presented.Go to contribution page
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