Evidence for color fluctuations in the nucleon in high-energy scattering (2008)
Frankfurt, L., Strikman, M., Treleani, D., Weiss, C.
We study quantum fluctuations of the nucleon's parton densities by combining QCD factorization for hard processes with the notion of cross section fluctuations in soft diffraction. The fluctuations...
Exclusive electroproduction of strange mesons with JLab 12 GeV (2008)
We summarize the physics topics which can be addressed by measurements of high-Q^2 exclusive electroproduction of strange mesons, gamma* N -> phi N, K* Lambda, K Lambda, K Sigma, at Jefferson Lab...
Electroproduction of $\phi(1020)$ Mesons at High $Q^2$ with CLAS (2008)
Santoro, J. P., Smith, E. S., Garcon, M., Guidal, M., Laget, J. M., Weiss, C., ...
Electroproduction of exclusive $\phi$ vector mesons has been studied with the CLAS detector in the kinematical range $1.6\leq Q^2\leq 3.8$ GeV$^{2}$, $0.0\leq t^{\prime}\leq 3.6$ GeV$^{2}$, and...
Bartels, J., Borras, K., Diehl, M., Jung, H., Abramowicz, H., Albacete, J., ...
Proceedings of the 12th International Conference on Elastic and Diffractive Scattering (Blois Workshop) - Forward Physics and QCD
Rapidity gap survival in the black-disk regime (2007)
Frankfurt, L., Hyde, C. E., Strikman, M., Weiss, C.
We summarize how the approach to the black--disk regime (BDR) of strong interactions at TeV energies influences rapidity gap survival in exclusive hard diffraction pp--> p + H + p (H =dijet, \bar Q...
Quark helicity flip and the transverse spin dependence of inclusive DIS (2007)
Afanasev, A., Strikman, M., Weiss, C.
Inclusive DIS with unpolarized beam exhibits a subtle dependence on the transverse target spin, arising from the interference of one-photon and two-photon exchange amplitudes in the cross section. We...
Transverse target spin asymmetry in inclusive DIS with two-photon exchange (2007)
Afanasev, A., Strikman, M., Weiss, C.
We study the transverse target spin dependence of the cross section for inclusive electron-nucleon scattering with unpolarized beam. Such dependence is absent in the one-photon exchange approximation...
Rapidity gap survival in the black-disk regime (2007)
Frankfurt, L., Hyde, C. E., Strikman, M., Weiss, C.
We summarize how the approach to the black-disk regime (BDR) of strong interactions at TeV energies influences rapidity gap survival in exclusive hard diffraction pp -> p + H + p (H = dijet, Qbar-Q,...
Transverse imaging of the proton in exclusive diffractive pp scattering (2006)
Hyde-Wright, C. E., Frankfurt, L., Strikman, M., Weiss, C.
In a recent paper (hep-ph/0608271) we describe a new approach to rapidity gap survival (RGS) in the production of high-mass systems (H = dijet, Higgs, etc.) in exclusive double-gap diffractive pp...
Frankfurt, L., Hyde-Wright, C. E., Strikman, M., Weiss, C.
We propose a new approach to the problem of rapidity gap survival (RGS) in the production of high-mass systems (H = dijet, heavy quarkonium, Higgs boson) in double-gap exclusive diffractive pp...
Higher twists in polarized DIS and the size of the constituent quark (2006)
The spontaneous breaking of chiral symmetry implies the presence of a short-distance scale in the QCD vacuum, which phenomenologically may be associated with the "size" of the constituent quark, rho...
The black-disk limit in high-energy ep and pp scattering (2006)
We review a recently proposed framework for studying the approach to the unitarity limit in small-x processes in ep and pp scattering within the DGLAP approximation. Our formulation is based on the...
Langbein, S., Badawi, K., Haecker, A., Weiss, C., Hatzinger, M., Alken, P., ...
Objective: To investigate whether the differentiated resection technique for excising superficial bladder cancer leads to higher recurrence and progression rates as compared with regular resection....
Small-x Physics: From HERA to LHC and beyond (2005)
Frankfurt, L., Strikman, M., Weiss, C.
We summarize the lessons learned from studies of hard scattering processes in high-energy electron-proton collisions at HERA and antiproton-proton collisions at the Tevatron, with the aim of...
Exclusive channels in semi-inclusive production of pions and kaons (2005)
Diehl, M., Kugler, W., Schaefer, A., Weiss, C.
We investigate the role of exclusive channels in semi-inclusive electroproduction of pions and kaons. Using the QCD factorization theorem for hard exclusive processes we evaluate the cross sections...
Frankfurt, L., Strikman, M., Weiss, C., Zhalov, M.
We discuss the global structure of pp events at LHC with hard processes (particle production in two-parton collisions) on the basis of the transverse spatial characteristics of the partonic initial...
3D parton imaging of the nucleon in high-energy pp and pA collisions (2004)
Frankfurt, L., Strikman, M., Weiss, C.
We discuss several examples of how the transverse spatial distribution of partons in the nucleon, as well as multiparton correlations, can be probed by observing hard processes (dijets) in...
Higher twists in spin structure functions from a "constituent quark" point of view (2004)
We discuss the implications of a "constituent quark" structure of the nucleon for the leading (1/Q^2-) power corrections to the spin structure functions. Our basic assumption is the presence of...
Periodic Field Emission from an Isolated Nano-Scale Electron Island (2004)
Scheible, D. V., Weiss, C., Kotthaus, J. P., Blick, R. H.
We observe field emission from an isolated nano-machined gold island. The island is able to mechanically oscillate between two facing electrodes, which provide recharging and detection of the...
We summarize what is known about the transverse spatial distribution of gluons in the nucleon and its x-dependence from exclusive J/psi photo/electroproduction in e-p fixed-target and collider...
Dijet production as a centrality trigger for p-p collisions at CERN LHC (2003)
Frankfurt, L., Strikman, M., Weiss, C.
We demonstrate that a trigger on hard dijet production at small rapidities allows to establish a quantitative distinction between central and peripheral collisions in pbar-p and p-p collisions at...
Chiral dynamics and the growth of the nucleon's gluonic transverse size at small x (2003)
We study the distribution of gluons in transverse space in the nucleon at moderately small x (~10^{-2}). At large transverse distances (impact parameters) the gluon density is generated by the 'pion...
Fiedler, U., Krissl, T., Koidl, S., Weiss, C., Koblizek, T., Deutsch, U., ...
Angiopoietin-1 (Ang-1) and angiopoietin-2 (Ang-2) have been identified as ligands with different effector functions of the vascular assembly and maturation-mediating receptor tyrosine kinase Tie-2....
Spontaneously Broken Chiral Symmetry and Hard QCD Phenomena (2002)
Amarian, M. J., Braun, V. M., Brodsky, S. J., Collins, J., Diehl, M., Ecker, G., ...
These are the mini-proceedings of the workshop ``Spontaneously Broken Chiral Symmetry and Hard QCD Phenomena" held at the Physikzentrum Bad Honnef from July 15 to 19, 2002. Every author presents a...
Twist-3 effects in deeply virtual Compton scattering made simple (2002)
We show that electromagnetic gauge invariance requires a 'spin rotation' of the quarks in the usual twist-2 contribution to the amplitude for deeply virtual Compton scattering. This rotation is...
Modeling power corrections to the Bjorken sum rule for the neutrino structure function F_1 (2002)
Direct measurements of the the structure functions F_1^{nu p} and F_1^{nu n} at a neutrino factory would allow for an accurate extraction of alpha_s from the Q^2-dependence of the Bjorken sum rule,...
Exclusive annihilation p pbar -> gamma gamma in a generalized parton picture (2002)
Freund, A., Radyushkin, A. V., Schaefer, A., Weiss, C.
Exclusive proton-antiproton annihilation into two photons at large s (~10 GeV^2) and |t|,|u| ~ s can be described by a generalized parton picture analogous to the 'soft mechanism' in wide-angle real...
Proton-antiproton annihilation into two photons at large s (2002)
Exclusive proton-antiproton annihilation into two photons can be viewed as the Compton process in the crossed channel. At large s (~10 GeV^2) and |t|,|u| s this process can be described by a...
Asymptotics of the number partitioning distribution (2002)
The number partitioning problem can be interpreted physically in terms of a thermally isolated non-interacting Bose gas trapped in a one-dimensional harmonic oscillator potential. We exploit this...
Polarized antiquark flavor asymmetry: Pauli blocking vs. the pion cloud (2002)
Fries, R. J., Schaefer, A., Weiss, C.
The flavor asymmetry of the unpolarized antiquark distributions in the proton, dbar(x) - ubar(x) > 0, can qualitatively be explained either by Pauli blocking by the valence quarks, or as an effect of...
A single droplet model to describe spray drying processes (2002)
Weiss, C., Hennig, T., Kümmel, R.
The use of population balances to describe the quality of solid particles received from spray drying processes is outlined. To describe the process, a single droplet model is developed. At the...
Crystallization in compressed gases - yet another spray-process (2002)
Weber, A., Weiss, C., Kümmel, R.
Processes which employ supercritical fluids as working media promise many sophisticated attributes regarding both environmentally benign processing as well as achieving so far unknown product...
Knuttinen, MG, Parrish, TB, Weiss, C, LaBar, KS, Gitelman, DR, Power, JM, ...
This study was designed to develop a suitable method of recording eyeblink responses while conducting functional magnetic resonance imaging (fMRI). Given the complexity of this behavioral setup...
Impaired eyeblink conditioning and decreased hippocampal volume in PDAPP V717F mice (2002)
Weiss, C, Venkatasubramanian, PN, Aguado, AS, Power, JM, Tom, BC, Li, L, ...
We examined heterozygous transgenic (Tg) mice that overexpress V717F amyloid precursor protein (APP) for delay eyeblink conditioning (EBC) and hippocampal volume with magnetic resonance imaging...
Kinematical twist-3 effects in DVCS as a quark spin rotation (2001)
We point out that the kinematical twist-3 contributions to the DVCS amplitude, required to restore electromagnetic gauge invariance of the twist-2 amplitude up to O(t/q^2), can be understood as a...
Lee, Nam-Young, Goeke, K., Weiss, C.
We estimate the twist-4 spin-1 nucleon matrix element f_2 in an instanton-based description of the QCD vacuum. In addition to the flavor-nonsinglet we compute also the flavor-singlet matrix element,...
Bernhardt, C, Weiss, C, Breuer, J, Kumpf, M, Sieverding, L
No abstract available.
Transversity distributions in the nucleon in the large-N_c limit (2001)
Schweitzer, P., Urbano, D., Polyakov, M. V., Weiss, C., Pobylitsa, P. V., Goeke, K.
We compute the quark and antiquark transversity distributions in the nucleon at a low normalization point of 600 MeV in the large-$N_c$ limit, where the nucleon can be described as a soliton of an...
Age-related effects on eyeblink conditioning in the F344 x BNF1 hybrid rat (2001)
Knuttinen, MG, Gamelli, AE, Weiss, C, Power, JM, Disterhoft, JF
Young, middle-aged, old, and senescent Fischer 344 X Brown Norway Fl hybrid rats were trained in either the trace or delay eyeblink conditioning task in order to investigate how aging affects...
A nanomechanical resonator shuttling single electrons at radio frequencies (2000)
Erbe, A., Weiss, C., Zwerger, W., Blick, R. H.
We observe transport of electrons through a metallic island on the tip of a nanomechanical pendulum. The resulting tunneling current shows distinct features corresponding to the discrete mechanical...
Electron Scattering with Polarized Targets at TESLA (2000)
Aschenauer, E. C., Belostotski, S., Bialowons, W., Bluemlein, J., Braun, V., ...
Measurements of polarized electron-nucleon scattering can be realized at the TESLA linear collider facility with projected luminosities that are about two orders of magnitude higher than those...
DVCS amplitude at tree level: Transversality, twist-3, and factorization (2000)
We study the virtual Compton amplitude in the generalized Bjorken region (q^2 -> Infinity, t small) in QCD by means of a light-cone expansion of the product of e.m. currents in string operators in...
DVCS amplitude with kinematical twist-3 terms (2000)
We compute the amplitude of deeply virtual Compton scattering (DVCS) using the calculus of QCD string operators in coordinate representation. To restore the electromagnetic gauge invariance...
Twist-4 quark-quark correlations in the pion from the instanton vacuum (2000)
Lee, Nam-Young, Goeke, K., Weiss, C.
The result for the matrix element A(I=2) = -0.14 F_pi^2 appears to be an artifact of an improper ultraviolet regularization. Paper withdrawn pending resolution of this problem.
Higher-twist contributions to F_L and F_2 from instantons (2000)
Dressler, B., Maul, M., Weiss, C.
We study the twist-4 contribution to the unpolarized nucleon structure functions, F_L and F_2, in an approach where the vacuum structure of QCD is described by a dilute medium of instantons...
Modeling Mass Transfer and Crystallization in Disperse Systems (2000)
Weiss, C., Hennig, T., Kümmel, R., Tschernjaew, J.
A mathematical model for mass transfer and crystallisation in a disperse system is presented under consideration of the moving boundary. The equations describing crystal birth and growth are coupled...
Polarized antiquark flavor asymmetry in Drell-Yan pair production (1999)
Dressler, B., Goeke, K., Polyakov, M. V., Schweitzer, P., Strikman, M., Weiss, C.
We investigate the role of the flavor asymmetry of the nucleon's polarized antiquark distributions in Drell-Yan lepton pair production in polarized nucleon-nucleon collisions at HERA (fixed-target)...
Flavor asymmetry of polarized antiquark distributions and semi-inclusive DIS (1999)
Dressler, B., Goeke, K., Polyakov, M. V., Weiss, C.
The $1/N_c$-expansion of QCD suggests large flavor asymmetries of the polarized antiquark distributions in the nucleon. This is confirmed by model calculations in the large-$N_c$ limit (chiral...
Twist-4 contribution to unpolarized structure functions F_L and F_2 from instantons (1999)
Dressler, B., Maul, M., Weiss, C.
We compute in the instanton vacuum the nucleon matrix elements of the twist-4 QCD operators describing power corrections to the second moments of the unpolarized structure functions, F_L and F_2. Our...
Accuracy of a mechanical single electron shuttle (1999)
Motivated by recent experiments, we calculate both the average current and the current fluctuations for a metallic island which oscillates between two symmetric electrodes. Electrons can only tunnel...
Skewed and double distributions in pion and nucleon (1999)
We study the non-forward matrix elements of twist-2 QCD light-ray operators and their representations in terms of skewed and double distributions, considering the pion as well as the nucleon. We...
Nucleon matrix elements of twist-3 and 4 operators from the instanton vacuum (1999)
Balla, J., Polyakov, M. V., Weiss, C.
The spin-dependent twist-3 and 4 nucleon matrix elements d^(2) and f^(2) describing power corrections to the Bjorken and Ellis-Jaffe sum rules are computed in the instanton vacuum. A systematic...
Modellierung von Stofftransport und Kristallisation in dispersen Systemen (1999)
Weiss, C., Hennig, T., Kümmel, R., Tschernjaew, J.
Im Beitrag wird ein Modell vorgestellt, mit dem die Kristallisation in dispersen Systemen beschrieben werden kann. Das mathematische Modell beinhaltet eine Kopplung von Stofftransport und...
Gas Antisolvent Crystallization - from Fundamentals to Industrial Applications (1999)
Weber, A., Weiss, C., Tschernjaew, J., Kümmel, R.
Gas Antisolvent Processes offer several benefits for the production of high-quality solids e.g. for nutritional or pharmaceutical use. In recent years the crystallization with supercritical fluids...
Payne, S., Peters, C. J., Makino, S., Oliver, K., Weiss, C., Kornguth, S., ...
A multiplexed screening system to detect pathogenicity islands (PI) of bacteria causing enteric disease and pathogenicity factors (PF) associated with the SARS-associated coronavirus (SARS-CoV) and...
Flavor asymmetry of polarized and unpolarized sea quark distributions in the large-N_c limit (1998)
Dressler, B., Goeke, K., Pobylitsa, P. V., Polyakov, M. V., Watabe, T., Weiss, C.
We summarize recent attempts to calculate the flavor asymmetry of the nucleon's sea quark distributions in the large-$N_c$ limit, where the nucleon can be described as a soliton of an effective...
Pion and photon light-cone wave functions from the instanton vacuum (1998)
Petrov, V. Yu., Polyakov, M. V., Ruskov, R., Weiss, C., Goeke, K.
The leading-twist wave functions of the pion and the photon at a low normalization point are calculated in the effective low--energy theory derived from the instanton vacuum. The pion wave function...
Two-pion light-cone distribution amplitudes from the instanton vacuum (1998)
We calculate the two-pion light-cone distribution amplitudes in the effective low-energy theory based on the instanton vacuum. These generalized distribution amplitudes describe the soft...
Baryon Form Factors in a Diquark--Quark Bound State Description (1998)
Nucleon form factors are calculated in a relativistic diquark--quark picture based on the Nambu--Jona-Lasinio model. The nucleon wave function is obtained in a static approximation to the quark...
Unpolarized and Polarized Quark Distributions in the (1998)
V. Yu. Petrov, P. V. Pobylitsa, M. V. Polyakov, C. Weiss
The isosinglet unpolarized and isovector polarized twist--2 quark distributions of the nucleon at low normalization point are calculated in the large--N c limit. The nucleon is described as a soliton...
Isovector unpolarized quark distribution in the nucleon in the large-N_c limit (1998)
Pobylitsa, P. V., Polyakov, M. V., Goeke, K., Watabe, T., Weiss, C.
We calculate the isovector (flavor-nonsinglet) unpolarized quark- and antiquark distributions in the nucleon at a low normalization point in the large-N_c limit. The nucleon is described as a soliton...
Nucleon parton distributions in the large $N_c$ limit (1997)
We review recent progress in calculating the twist--2 parton distribution functions at a low normalization point in the large--$N_c$ limit, where the nucleon can be described as a soliton of the...
We calculate the isosinglet unpolarized quark-- and antiquark distributions at a low normalization point in the large--$N_c$ limit. The nucleon is described as a self-consistent soliton solution of...
Unpolarized and Polarized Quark Distributions in the (1997)
V. Yu. Petrov, P. V. Pobylitsa, M. V. Polyakov, C. Weiss
The isosinglet unpolarized and isovector polarized twist--2 quark distributions of the nucleon at low normalization point are calculated in the large--N c limit. The nucleon is described as a soliton...
Unpolarized and Polarized Quark Distributions in the (1997)
V. Yu. Petrov, P. V. Pobylitsa, M. V. Polyakov, C. Weiss
The isosinglet unpolarized and isovector polarized twist--2 quark distributions of the nucleon at low normalization point are calculated in the large--N c limit. The nucleon is described as a soliton...
Estimates of higher-dimensional vacuum condensates from the instanton vacuum (1997)
We calculate the values of non-factorizable dimension-7 vacuum condensates in the instanton vacuum. We comment on a method, recently proposed by Oganesian, to estimate the dimension-7 condensates by...
Off-forward quark distributions of the nucleon in the large N_c limit (1997)
Petrov, V. Yu., Pobylitsa, P. V., Polyakov, M. V., Boernig, I., Goeke, K., Weiss, C.
We study the off-forward quark distributions (OFQD's) in the chiral quark-soliton model of the nucleon. This model is based on the large-N_c picture of the nucleon as a soliton of the effective...
Nucleon structure functions from the instanton vacuum: Leading and non-leading twists (1997)
We review the description of nucleon structure functions in the instanton vacuum. This includes the calculation of the twist-2 parton distributions at a low normalization point as well as...
Nucleon matrix elements of higher-twist operators from the instanton vacuum (1997)
Balla, J., Polyakov, M. V., Weiss, C.
We compute the nucleon matrix elements of QCD operators of twist 3 and 4 in the instanton vacuum. We consider the operators determining 1/Q^2-power corrections to the Bjorken, Ellis-Jaffe and...
Unpolarized and polarized quark distributions in the large-Nc limit (1997)
Diakonov, D. I., Petrov, V. Yu., Pobylitsa, P. V., Polyakov, M. V., Weiss, C.
The isosinglet unpolarized and isovector polarized twist-2 quark distributions of the nucleon at low normalization point are calculated in the large-Nc limit. The nucleon is described as a soliton of...
A chiral Lagrangian for excited pions (1996)
We construct a chiral Lagrangian containing besides the usual pion field (pi) also its first radial excitation (pi'). The Lagrangian is derived by bosonization of a Nambu--Jona-Lasinio quark model...
Mixed quark-gluon condensate from instantons (1996)
We calculate the vacuum expectation value of the dimension-5 "mixed" quark-gluon operator, $O_\sigma = \bar\psi (\lambda^a /2) \sigma_{\mu\nu} \psi F_{\mu\nu}^a$, in the instanton vacuum. Within the...
Nucleon Parton Distributions at Low Normalization Point in the Large N_c Limit (1996)
Diakonov, D., Petrov, V., Pobylitsa, P., Polyakov, M., Weiss, C.
At large N_c the nucleon can be viewed as a soliton of the effective chiral lagrangian. This picture of nucleons allows a consistent nonperturbative calculation of the leading-twist parton...
Nucleon spin structure from the instanton vacuum (1996)
We discuss the evaluation of the nucleon isoscalar axial coupling, $g_A^{(0)}$, in the instanton vacuum, using the $1/N_c$ expansion. This approach allows a fully consistent treatment of the $U(1)_A$...