Measurement of isolated photon production in hadronic Z decays

Décamp, D.; Deschizeaux, B.; Goy, C.; Lees, J. P.; Minard, M.-N.; Ajaltouni, Z.; Bardadin-Otwinowska, M.; Falvard, A.; Fellous, R. El; Harvey, J.; Henrard, P.; Jousset, J.; Michel, B.; Montret, Jean-Claude; Pallin, D.; Perret, P.; Proriol, J.; Prulhière, F.; Stimpfl, G.; Badier, J.; Blondel, A.; Bonneaud, G. R.; Bourotte, J.; Braems, F.; Brient, J. C.; Fouque, G.; Gamess, A.; Guirlet, R.; Orteu, S.; Rosowsky, A.; Rougé, A.; Rumpf, M.; Tanaka, R.; Videau, H.; Albanèse, J.P.; Aubert, J.J.; Benchouk, C.; Bernard, Véronique; Bonissent, A.; Courvoisier, D.; Etienne, F.; Papalexiou, S.; Payre, P.; Pietrzyk, B.; Qian, Z.; Bertín, V.; Boucrot, J.; Callot, O.; Chen, X.; Cordier, A.; Davier, M.; Ganis, G.; Grivaz, J.-F.; Heusse, P.; Janot, P.; Kim, D.W.; Diberder, F. Le; Lefrançois, J.; Lutz, A. M.; Veillet, J. J.; Videau, I.; Zhang, Zhen; Zomer, F.; Bloch-Devaux, B.; Colas, P.; Klopfenstein, C.; Locci, E.; Loucatos, S.; Monnier, E.; Pérez, P.; Perlas, J. A.; Perrier, Frédéric; Rander, J.; Renardy, J. F.; Roussarie, A.; Schuller, J. P.; Schwindling, J.; Vallage, B.

doi:10.1016/0370-2693(91)90380-9

Cited by 26 publications

(4 citation statements)

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“…The corresponding theoretical problems are well understood in the case of prompt photon production at hadron colliders, photo-production of jets and heavy flavor and photon-photon scattering. It is an important development that experiments at LEP give us high statistics data and open ground to study even photon plus multijet final states [1,2]. The better data call for a quantitative QCD description.…”

Section: Introductionmentioning

confidence: 99%

“…It also appears useful to calculate the next-to-leading order perturbative cross section dσ (1) /dE γ in the MS scheme. This requires the calculation of the next-to-leading order splitting function P (1) γ/a in the presence of isolation cuts and a corresponding local subtraction term has to be found. This is a complex but feasible calculation.…”

Section: Introductionmentioning

confidence: 99%

“…This is a complex but feasible calculation. Since such a result is not yet available, in the next section we carry out the calculation of dσ (1) γ in a different subtraction scheme where the photon is completely isolated from the quarks but not from soft gluons ("cone subtraction"). In this scheme, in leading order, the counter-term is vanishing and the cross section becomes independent of ǫ c :…”

Section: Introductionmentioning

confidence: 99%

“…In the next section we present the results of our next-to-leading order perturbative calculation of dσ (1) iso for isolated photon plus n-jet production. We conjecture that a jet algorithm applied to the isolated photon hard scattering cross section (eq.…”

Section: Introductionmentioning

confidence: 99%

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QCD corrections to photon production in association with hadrons in e+e− annihilation

Kunszt

Trocsanyi

1993

Nuclear Physics B

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A detailed investigation of the theoretical ambiguities present in the QCD description of photon production in e + e − annihilation is given. It is pointed out that in a well-defined perturbative analysis it is necessary to subtract the quark-photon collinear singularities. This subtraction requires the introduction of an unphysical parameter in the perturbative part of the cross section. The subtracted term is factored into non-perturbative fragmentation function. The dependence on the unphysical parameter cancels in the sum of non-perturbative and perturbative parts. It is pointed out that for E γ ≤ √ s/(2(1 + ǫ c )) the non-perturbative contributions are suppressed. Using a general purpose next-to-leading order Monte Carlo program, we calculate various physical quantities that were measured in LEP experiments recently. †

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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QCD corrections to photon production in association with hadrons in e+e− annihilation

Kunszt

Trocsanyi

1993

Nuclear Physics B

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Tests of the Electroweak Theory at LEP

Schaile

1994

Fortschr. Phys.

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independent search for new physics.the Standard Model multiplet structure and an analysis in a framework which provides a model constraints on Standard Model parameters and on new particles, the sensitivity to deviations from so far. \Ve present several analyses which reveal specific aspects of the results, such as their of t.hese measurements a.nd their theoretical parametrization and summarize the results available charge asymmetry and of final state radiation in hadronic events. \Ye discuss experimental aspects partial widths and forward-backward asymmetries of heavy quark flavours, of the inclusive q § and leptonic cross sections, leptonic forward-backward asymmetries, T polarization asymmetries, LEP offers a rich choice of tests of the electroweak t.heorv such as the measurement of hadronic provide a window to new physics in an energy domain which is beyond the reach of present or even the with masses far beyond the range of direct production. Their precise measurement might therefore contrast to pure QED. radiative corrections in the electroweak theory are also sensitive to particles at the Z0 resonance can be compared with tests of QED like those of the g -2 experiments. In probe tiny modifications to the tree level processes. The electroweak precision tests in e+e" collisions to extend these tests of the theory to a variety of aspects inherent to its quantum structure and to colliders LEP and SLC The analysis of e+e" collisions at LEP and SLC offers a unique opportunity to establish the theory in considerable detail. well before the start of Z0-pole physics at the e+e" ofthe neutral current in neutrino scattering experiments Since then many experiments contributedThe first experimental success of the Standard Model of electroweak interactions [1] was the discovery

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Study of the four-fermion final state at the Z resonance

Buskulic¹,

Casper²,

Bonis³

et al. 1995

Z. Phys. C - Particles and Fields

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The process e + e ! l lf f, where l is a charged or a neutral lepton and f any charged fermion, is analyzed. The study uses the ALEPH data collected at LEP from 1989 to 1993 at centre-of-mass energies between 88 and 95 GeV, corresponding to almost two million hadronic Z decays and to a total integrated luminosity o f 79 pb 1 . F or all channels, the data agree well with the standard model expectation both in shape and normalization. The indication of an excess in the e + e ! + f f channel, reported by ALEPH in 1991, is not conrmed.

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Measurement of isolated photon production in hadronic Z decays

Cited by 26 publications

References 13 publications

QCD corrections to photon production in association with hadrons in e+e− annihilation

QCD corrections to photon production in association with hadrons in e+e− annihilation

Tests of the Electroweak Theory at LEP

Study of the four-fermion final state at the Z resonance

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