Mean lifetime of theB s 0 meson

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doi:10.1007/bf02906957

Cited by 23 publications

(42 citation statements)

References 14 publications

Supporting

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“…DELPHI have also measured the B 0 s lifetime in B 0 s → D s X, assumed to contain more CP-even than CP-odd decays [22]. s lifetime τ Bs = 1/Γ s is assumed to be equal to the B 0 d lifetime, which is expected to be true to better than 1 %.…”

Section: Introductionmentioning

confidence: 99%

B physics at the Z⁰resonance

Hawkings

Willocq

2001

J. Phys. G: Nucl. Part. Phys.

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Section: Introductionmentioning

confidence: 99%

B physics at the Z⁰resonance

Hawkings

Willocq

2001

J. Phys. G: Nucl. Part. Phys.

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“…Since some of the recent measurements differ significantly from those used in the tuning, and many have much reduced errors, a new iteration in the parameter tuning procedure seems necessary. All of the models considered in [41] describe however the inclusive rates reasonably well, with the exception of the still ever bad performance of Herwig cluster fragmentation in the baryon sector.…”

Section: Discussionmentioning

confidence: 91%

“…Sets of tuned parameters have been published [41] for various Monte Carlo models, including Ariadne and Jetset with matrix elements as well as with parton showers, where event shape variables as well as inclusive identified particle rates were taken into account. Since some of the recent measurements differ significantly from those used in the tuning, and many have much reduced errors, a new iteration in the parameter tuning procedure seems necessary.…”

Section: Discussionmentioning

confidence: 99%

“…Only a leading-order description of aplanar, four-parton, event shapes such as the transverse momentum out of the event plane p out ⊥ , the four-jet rate etc, are presently available, although partial results are available [23] in higher order. Here agreement between data and Monte Carlo is less satisfactory, with 30% discrepancies occurring for p out ⊥ and the 4-jet rate [29,40,41]. Hopefully the situation will be improved by matching the showers to exact fixed-order results.…”

Section: Global Event Propertiesmentioning

confidence: 99%

“…Establishing agreement between the predictions of event generator programs and data for event shape variables is very important for confirming our ability to model QCD as a whole and has led to a first generation tuning of the Monte Carlo models [43]. A second generation of tunings, which also take into account data on identified particle production, are now becoming available [29,40,41]. This tuning is not a trivial exercise as it is often the case that a distribution depends in a complex way on free parameters of a model.…”

Section: Global Event Propertiesmentioning

confidence: 99%

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Coherence Effects and Perturbative QCD Tests with the OPAL Detector at LEP

Boutemeur

2002

Fortschr. Phys.

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I report on results and methods from a set of analyses performed within the OPAL collaboration at CERN. The full available data sample collected at and near the Z0 resonance is used. Results concern colour‐field interference and coherence phenomena, quark and gluon jet properties, identified particles in quark and gluon jets, measurements of the QCD colour factors and relevant tests of recently improved perturbative QCD calculations. The challenge is that QCD is a quantum field theory that requires all orders in perturbation theory and non‐perturbative analysis to confront data at available energies. Thus, precise measurements can be thought as explorations of quantum field theory itself. Nonetheless, these tests and measurements have important practical applications, in the calculation of backgrounds to new physics and, for hadron collider particularly, in predictions for new particle cross‐sections.

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Four jet event shapes in electron-positron annihilation

1999

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We report next-to-leading order perturbative QCD predictions of 4 jet event shape variables for the process e + e − → 4 jets obtained using the general purpose Monte Carlo EERAD2. This program is based on the known 'squared' one loop matrix elements for the virtual γ * → 4 parton contribution and squared matrix elements for 5 parton production. To combine the two distinct final states numerically we present a hybrid of the commonly used subtraction and slicing schemes based on the colour antenna structure of the final state which can be readily applied to other processes. We have checked that the numerical results obtained with EERAD2 are consistent with nextto-leading order estimates of the distributions of previously determined four jet-like event variables. We also report the next-to-leading order scale independent coefficients for some previously uncalculated observables; the light hemisphere mass, narrow jet broadening and the 4 jet transition variables with respect to the JADE and Geneva jet finding algorithms. For each of these observables, the next-to-leading order corrections calculated at the physical scale significantly increase the rate compared to leading order (the K factor is approximately 1.5 -2). With the exception of the 4 jet transition variables, the published DELPHI data lies well above the O(α 3 s ) predictions. The renormalisation scale uncertainty is still large and in most cases the data prefers a scale significantly smaller than the physical scale. This situation is reminiscent of that for three jet shape variables, and should be improved by the inclusion of power corrections and resummation of large infrared logarithms.

show abstract

Mean lifetime of theB s 0 meson

Cited by 23 publications

References 14 publications

B physics at the Z⁰resonance

B physics at the Z⁰resonance

Coherence Effects and Perturbative QCD Tests with the OPAL Detector at LEP

Four jet event shapes in electron-positron annihilation

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Mean lifetime of theB s 0 meson

Cited by 23 publications

References 14 publications

B physics at the Z0resonance

B physics at the Z0resonance

Coherence Effects and Perturbative QCD Tests with the OPAL Detector at LEP

Four jet event shapes in electron-positron annihilation

Contact Info

Product

Resources

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B physics at the Z⁰resonance

B physics at the Z⁰resonance