Cern--Th/97--261; Nordita-97/60 P; Tum/t39-97-25 (2007)
Production In, G. A. Schuler, M. Vanttinen
Inclusive production of Ø cJ in e + e \Gamma annihilation is an excellent probe of the role of higher Fock states in the production of heavy quarkonia. Within the non-relativistic QCD approach,...
The ATLAS Level-1 Central Trigger Processor (CTP) (2003)
Ellis, Nick, Wengler, T, Torga-Teixeira, R, Schörner-Sadenius, T, Spiwoks, R, Schuler, G A, ...
A Demonstrator for the ATLAS Level-1 Muon to Central Trigger Processor Interface (MUCTPI) (2000)
Corre, A, Ellis, Nick, Farthouat, Philippe, Hasegawa, Y, Schuler, G A, Schwick, C, ...
The Level-1 Muon Trigger Interface (MUCTPI) to the Central Trigger Processor (CTP) receives trigger information from the detector- specific logic of the muon trigger. This information contains up to...
The Trigger Menu Handler of the ATLAS Level-1 Central Trigger Processor (2000)
Ellis, Nick, Farthouat, Philippe, Schuler, G A, Spiwoks, R
The role of the Central Trigger Processor (CTP) in the ATLAS Level-1 trigger is to combine information from the calorimeter and muon trigger processors, as well as from other sources, e.g....
Third General Meeting of the LEP2 Workshop (2000)
Schuler, G A, Jadach, Stanislaw, Lönnblad, L, Nicrosini, O
y-y. Event generators for y-y. Event generators for Bhabha
Dynamics of Glueball and $q\overline{q}$ production in the central region of p p collisions (2000)
Close, Francis Edwin, Kirk, A, Schuler, G A
We explain the phi and t dependences of mesons with JPC = 0pm +,1^++,2pm +$ produced in the central region of pp collisions. For the 0++ and 2++ sector this reveals a systematic behaviour in the data...
Quarkonium momentum distributions in photoproduction and B decay (2000)
Beneke, Martin, Schuler, G A, Wolf, S
According to our present understanding many $J/\psi$ production processes proceed through a coloured $c\bar{c}$ state followed by the emission of soft particles in the quarkonium rest frame. The...
Quarkonium momentum distributions in photoproduction and B decay (2000)
Beneke, M., Schuler, G. A., Wolf, S.
According to our present understanding many $J/\psi$ production processes proceed through a coloured $c\bar{c}$ state followed by the emission of soft particles in the quarkonium rest frame. The...
Evidence that the Pomeron transforms as a non-conserved vector current (1999)
Close, Francis Edwin, Schuler, G A
The detailed dependences of central meson production on the azimuthal angle phi, t and the meson J^P are shown to be consistent with the hypothesis that the soft Pomeron transforms as a non-conserved...
Evidence that the Pomeron transforms as a non-conserved vector current (1999)
The detailed dependences of central meson production on the azimuthal angle phi, t and the meson J^P are shown to be consistent with the hypothesis that the soft Pomeron transforms as a non-conserved...
Central production of mesons: exotic states versus Pomeron structure (1999)
Close, Francis Edwin, Schuler, G A
We demonstrate that the azimuthal dependence of central meson production in hadronic collisions, when suitably binned, provides unambiguous tests of whether the Pomeron couples like a conserved...
Central production of mesons: Exotic states versus Pomeron structure (1999)
We demonstrate that the azimuthal dependence of central meson production in hadronic collisions, when suitably binned, provides unambiguous tests of whether the Pomeron couples like a conserved...
Vector-Meson Electroproduction from Generalized Vector Dominance (1998)
Schildknecht, D, Schuler, G A, Surrow, B
Including destructively interfering off-diagonal transitions of diffraction-dissociation type, we arrive at a formulation of GVD for exclusive vector-meson production in terms of a continuous...
Testing factorization of charmonium production (1998)
Within the NRQCD factorization approach the production of heavy quarkonia can be calculated in perturbative QCD in terms of a few production-process-independent NRQCD matrix elements. We test the...
Testing factorization of charmonium production (1998)
Within the NRQCD factorization approach the production of heavy quarkonia can be calculated in perturbative QCD in terms of a few production-process-independent NRQCD matrix elements. We test the...
Measurement of the beauty production cross-section in 350 GeV/c $\pi^-$ -Cu interactions (1998)
Adamovich, M I, Adinolfi, M, Alexandrov, Yu A, Angelini, C, Antinori, Federico, Bacci, Cesare, ...
Using a sample of $10^8$ triggered events, produced in $\pi^-$--$\,$Cu interactions at 350~GeV$/c$, we have identified 26 beauty events. The estimated background in this sample is $0.6 \pm 0.6$...
Two-photon physics with GALUGA 2.0 (1997)
An extended version of the Monte Carlo program GALUGA is presented for the computation of two-photon production in $\e^+\e^-$ collisions. Functions implemented for the five $\gamma^\star\gamma^\star$...
Meson-photon transition form factors and resonance cross-sections in $e^+ e^-$ collisions (1997)
Schuler, G A, Berends, F A, Van Gulik, R
Meson--photon--photon transition form factors for S-, P-, and D-wave states are calculated, the meson being treated as a non-relativistic heavy-quark--antiquark pair. The full dependence on both...
Meson--photon transition form factors and resonance cross-sections in e^+ e^- collisions (1997)
Schuler, G. A., Berends, F. A., Van Gulik, R.
Meson--photon--photon transition form factors for S-, P-, and D-wave states are calculated, the meson being treated as a non-relativistic heavy-quark--antiquark pair. The full dependence on both...
$\chi_{c J}$ production in $e^+e^-$ annihilation (1997)
Inclusive production of $\chi_{c J}$ in $e^+e^-$ annihilation is an excellent probe of the role of higher Fock states in the production of heavy quarkonia. Within the non-relativistic QCD approach,...
$\chi_{c J}$ production in $e^+e^-$ annihilation (1997)
Inclusive production of $\chi_{c J}$ in $e^+e^-$ annihilation is an excellent probe of the role of higher Fock states in the production of heavy quarkonia. Within the non-relativistic QCD approach,...
Power counting in exclusive quarkonium decays (1997)
Recent progress in the factorization of exclusive decays of heavy quarkonia into long-distance and short-distance contributions is presented. The role of higher Fock states and colour-octet...
Model-independent QED corrections to photon structure-function measurements (1997)
We present the first calculation of QED radiative corrections to deep-inelastic electron-photon scattering in terms of those variables that are reconstructed in measurements of the photon structure...
Model-independent QED corrections to photon structure-function measurements (1997)
We present the first calculation of QED radiative corrections to deep-inelastic electron-photon scattering in terms of those variables that are reconstructed in measurements of the photon structure...
Higher Fock states and power counting in exclusive P-wave quarkonium decays (1997)
Bolz, J, Kroll, P, Schuler, G A
Exclusive processes at large momentum transfer Q factor into perturbatively calculable short-distance parts and long-distance hadronic wave functions. Usually, only contributions from the leading...
Quarkonium production: velocity-scaling rules and long-distance matrix elements (1997)
The hierarchy of long-distance matrix elements (MEs) for quarkonium production depends on their scaling with the velocity $v$ of the heavy quark in the bound state. Ranges for the velocities in...
GALUGA, a Monte Carlo program for two-photon processes in $e^+ e^-$ collisions (1996)
A Monte Carlo program is presented for the computation of the most general cross section for two-photon production in e+e- collisions at fixed two-photon invariant mass W. Functions implemented for...
Improving the equivalent-photon approximation in electron-positron collisions (1996)
The validity of the equivalent-photon approximation for two-photon processes in electron--positron collisions is critically examined. Commonly used forms to describe hadronic two-photon production...
Colour-octet contributions to exclusive charmonium decays (1996)
Bolz, J, Kroll, P, Schuler, G A
We investigate the theoretical uncertainties of $P$-wave charmonium decays into two pions, $\chi_{\c J}\rightarrow \pi^+\pi^-$, $\pi^0\pi^0$. Constraining the pion distribution-amplitude from the...
Colour-octet contributions to exclusive charmonium decays (1996)
Bolz, J., Kroll, P., Schuler, G. A.
We investigate the theoretical uncertainties of $P$-wave charmonium decays into two pions, $\chi_{\c J}\rightarrow \pi^+\pi^-$, $\pi^0\pi^0$. Constraining the pion distribution-amplitude from the...
WA92: a fixed target experiment to trigger on and identify beauty particle decays (1996)
Adamovich, M I, Adinolfi, M, Alexandrov, Yu A, Angelini, C, Antinori, Federico, Bacci, Cesare, ...
We describe the detectors and trigger system used in the CERN WA92 experiment. The experiment was designed to study the production and decay of beauty particles from 350 GeV/$c\,$ $\,\pi^-$...
Systematics of quarkonium production (1996)
Quarkonium production in high-energy reactions is found to exhibit a behaviour more universal than that expected from velocity scaling. Total rates of quarkonia produced in hadronic interactions as...
AROMA 2.2: a Monte Carlo generator for heavy flavour events in ep collisions (1996)
Ingelman, G, Rathsman, J, Schuler, G A
A program to simulate the production of heavy quarks through the boson-gluon fusion process in e^{\pm}p collisions is presented. The full electro\-weak structure of the electron--gluon interaction is...
AROMA 2.2 - A Monte Carlo Generator for Heavy Flavour Events in $ep$ Collisions (1996)
Ingelman, G., Rathsman, J., Schuler, G. A.
A program to simulate the production of heavy quarks through the boson-gluon fusion process in $e^{\pm}p$ collisions is presented. The full electro\-weak structure of the electron--gluon interaction...
A scenario for high-energy $\gamma\gamma$ interactions (1996)
Schuler, G A, Sjöstrand, Torbjörn
A real photon has a complicated nature, whereby it may remain unresolved or fluctuate into a vector meson or a perturbative q-qbar pair. In gamma-gamma events, this gives three by three combinations...
Gamma-gamma physics at LEP2 (1996)
Aurenche, Patrick, Schuler, G A, Bawa, A C, Boudinov, E, Buijs, A, Cacciari, M, ...
This report is an overview of the gamma-gamma physics capabilities of LEP2, and covers the following topics: structure functions, equivalent photon approximation, tagging conditions etc, soft and...
Gamma-Gamma Physics at LEP2 (1996)
Aurenche, P., Schuler, G. A., Bawa, A., Boudinov, E., Buijs, A., Cacciari, M., ...
This report is an overview of the gamma-gamma physics capabilities of LEP2, and covers the following topics: structure functions, equivalent photon approximation, tagging conditions etc, soft and...
Parton distributions of the virtual photon (1996)
Schuler, G A, Sjöstrand, Torbjörn
We propose a generic ansatz for the extension of parton distributions of the real photon to those of the virtual photon. Alternatives and approximations are studied that allow closed-form...
$\gamma\gamma$ event generators (1996)
Lönnblad, L, Wright, A, Walker, R, Sjöstrand, Torbjörn, Schuler, G A, Ranft, J, ...
The report from the working group on '\gamma\gamma Event Generators' of the LEP 2 workshop
$\gamma\gamma$ event generators (1996)
Lönnblad, L, Seymour, Michael H, Boudinov, E, Butterworth, J, Engel, R, Finch, A, ...
The report from the working group on '\gamma\gamma Event Generators' of the LEP 2 workshop
Low- and high-mass components of the photon distribution functions (1995)
Sjöstrand, Torbjörn, Schuler, G A
Four new parton distributions of the photon are presented, with a description of theory choices, properties and applications.
Low- and high-mass components of the photon distribution functions (1995)
Sjöstrand, Torbjörn, Schuler, G A
Four new parton distributions of the photon are presented, with a description of theory choices, properties and applications.
Radiative corrections to e$\gamma$ scattering (1995)
Laenen, Eric, Gerhard, A, Schuler, G A
We investigate the effects of photon radiation on deep-inelastic \re\gamma scattering. Depending on the set of variables chosen, we find appreciable effects in the kinematic region accessible at...
Search for the decay D$^{0}$ --> $\mu^{+}\mu^{-}$ (1995)
Adamovich, M I, Adinolfi, M, Alexandrov, Yu A, Angelini, C, Bacci, Cesare, Barberis, D, ...
On the non-perturbative part of the photon structure function (1995)
We discuss a dispersion relation in the photon mass and show how (in principle) model-independent constraints on the parton distribution functions of the photon, notably a momentum sumrule, can be...
Production of heavy quarks and heavy quarkonia (1995)
Uncertainties in the next-to-leading-order calculations of heavy-quark (Q) production are investigated. Predictions for total cross sections, single-inclusive distributions of heavy quarks and heavy...
Low- and high-mass components of the photon distribution functions (1995)
Schuler, G A, Sjöstrand, Torbjörn
The structure of the general solution of the inhomogeneous evolution equations allows the separation of a photon structure function into perturbative (``anomalous") and non-perturbative...
Quarkonium production in hadronic collisions (1995)
Gavai, R, Kharzeev, Dima E, Satz, Helmut, Schuler, G A, Sridhar, K, Vogt, R
We summarize the theoretical description of charmonium and bottonium production in hadronic collisions and compare it to the available data from hadron-nucleon interactions. With the parameters of...
Quarkonium production in hadronic collisions (1995)
Gavai, R., Kharzeev, D., Satz, H., Schuler, G. A., Sridhar, K., Vogt, R.
We summarize the theoretical description of charmonium and bottonium production in hadronic collisions and compare it to the available data from hadron-nucleon interactions. With the parameters of...
Study of charm correlations in $\pi^{-}$-N interactions at \Sqrt s $\appprox$ 26 GeV (1995)
Adamovich, M I, Adinolfi, M, Alexandrov, Yu A, Angelini, C, Antinori, Federico, Bacci, Cesare, ...
HQ$\overline{Q}$ET: an effective theory approach to heavy quarkonia decays (1995)
We discuss systems containing a heavy quark and a heavy antiquark in the infinite mass limit of QCD. Studying the limit of equal velocities for both heavy particles, we formulate an effective theory...
Heavy quarkonium effective theory (1994)
We formulate a QCD-based effective theory approach to heavy quarkonia-like systems as \bar{c} c and \bar{b} b resonances and B_c states. We apply the method to inclusive decays, working out a few...
$\gamma$-$\gamma$ and $\gamma$-p events at high energies (1994)
Schuler, G A, Sjöstrand, Torbjörn
A real photon has a complicated nature, whereby it may remain unresolved or fluctuate into a vector meson or a perturbative q-qbar pair. Based on this picture, we previously presented a model for...
$\gamma$-$\gamma$ and $\gamma$-p events at high energies (1994)
Schuler, G A, Sjöstrand, Torbjörn
A real photon has a complicated nature, whereby it may remain unresolved or fluctuate into a vector meson or a perturbative q-qbar pair. Based on this picture, we previously presented a model for...
Quarkonium production and decays (1994)
Quarkonium decays are studied in the charmonium model. Relativistic corrections, higher-order perturbative QCD corrections and non- perturbative contributions are discussed. Recent measurements of...
Quarkonium production and decays (1994)
Quarkonium decays are studied in the charmonium model. Relativistic corrections, higher-order perturbative QCD corrections and non- perturbative contributions are discussed. Recent measurements of...
Quarkonium production and decays (1994)
Quarkonium decays are studied in the charmonium model. Relativistic corrections, higher-order perturbative QCD corrections and non- perturbative contributions are discussed. Recent measurements of...
The trigger system of the OPAL experiment at LEP (1991)
Arignon, M, Ball, A H, Bell, K W, Bramhall, M, Braun, A, Carter, A A, ...
P. Aurenche, Conveners P. Aurenche, G. A. Schuler, E. Boudinov, A. Buijs, M. Cacciari, ...
this report to extrapolate the published results to a total charm cross section. Some caution is in order however when comparing theory and the results of different experiments in this way. This...
The central calorimeter for the UA2 experiment at the CERN $\overline{p}$p collider (1990)
Beer, A, Bonaudi, Franco, Bonnefoy, L, Borghini, Michel, Bourgeois, F, Clark, A G, ...
High-density CAMAC and FASTBUS charge integrating ADC for use at the LEP OPAL detector (1990)
Bourgeois, F, Corre, A, Marcelin, J P, Meyrier, A, Schuler, G A