Specific features of heavy quark production: Local parton-hadron duality approach to heavy particle spectra

Dokshitzer, Yu. L.; Хозе, В. А.; Troyan, S. I.

doi:10.1103/physrevd.53.89

Cited by 154 publications

(225 citation statements)

References 56 publications

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“…However, a high quark mass provides a convenient cut-off point and the distribution of the scaled momentum of the heavy * Also with Università di Perugia, Dipartimento di Fisica, Perugia, Italy † Also with Università della Basilicata, Potenza, Italy quark before hadronization, x Q ≡ 2p * Q / √ s, can be calculated [5,6,7,8]. The observable P (x p ) is thought to be related by a simple convolution or hadronization model.…”

Section: Introductionmentioning

confidence: 99%

InclusiveΛc+production ine+e−annihilations at
Aubert¹,
Bóna²,
Boutigny³
et al. 2007
Phys. Rev. D
18
0
7
0
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We present measurements of the total production rates and momentum distributions of the charmed baryon Λ + c in e + e − → hadrons at a center-of-mass energy of 10.54 GeV and in Υ (4S) decays. In hadronic events at 10.54 GeV, charmed hadrons are almost exclusively leading particles in e + e − → cc events, allowing direct studies of c-quark fragmentation. We measure a momentum distribution for Λ + c baryons that differs significantly from those measured previously for charmed mesons. Comparing with a number of models, we find none that can describe the distribution completely. We measure an average scaled momentum of xp = 0.574±0.009 and a total rate of N qq Λc = 0.057±0.002(exp.)±0.015(BF) Λ + c per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, pK − π + . In Υ (4S) decays we measure a total rate of N Υ Λc = 0.091±0.006(exp.)±0.024(BF) per Υ (4S) decay, and find a much softer momentum distribution than expected from B decays into a Λ + c plus an antinucleon and one to three pions.

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Section: Introductionmentioning

confidence: 99%

InclusiveΛc+production ine+e−annihilations at
Aubert¹,
Bóna²,
Boutigny³
et al. 2007
Phys. Rev. D
18
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7
0
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“…It is interesting to discuss this quantity in some detail since it illustrates the structure of (27). First observe that the distribution depends on E and E out through the SL function τ given by (31) with M → E out .…”

Section: Observables In the Soft Limitmentioning

confidence: 99%

“…To obtain Σ(τ ) from G ab [E, u] one takes u(q) = 0 away from jets and u(q) = 1 inside the jet region. From (27) one derives the evolution equation [44] …”

Section: Observables In the Soft Limitmentioning

confidence: 99%

“…While in the massless case (3) the distribution is collinear singular for k parallel to the emitting charges, in the heavy quark case the collinear singularities are screened: distribution vanishes for k parallel to the heavy quark (or antiquark) P a and the radiation is suppressed [26,27] in the cone cos θ ak > v a .…”

Section: Coherence Of Soft Gluons and Colour Connectionmentioning

confidence: 99%

“…The evolution equation (27) can be formulated as a Markov process and then numerically solved. This Monte Carlo procedure has been introduced in [46] to study non-global distributions.…”

Section: Monte Carlo Simulation For Soft Emissionmentioning

confidence: 99%

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From QCD Lagrangian to Monte Carlo Simulation

Marchesini

Lecture Notes in Physics

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I discuss old and recent aspects of QCD jet-emission and describe how hard QCD results are used to construct Monte Carlo programs for generating hadron emission in hard collisions. I focus on the program HERWIG at LHC. The statusLHC is a discovery machine, it is expected to tell us how to complete the unified theory of elementary interactions. New (heavy) particles are searched to indicate/confirm new symmetries. Events with heavy particles are expected to be accompanied by an intense emission of hadrons at short distances, and this is the domain of perturbative QCD. Therefore, to identify and understand non-standard events a quantitative knowledge of the characteristics of the hard radiation is strongly needed. In 1973 QCD was at the frontier of particle physics (discovery of asymptotic freedom [1] and beginning of quantitative QCD studies), now in 2007 QCD is at the center of particle studies. The Monte Carlo programs for jet emissions [2][3][4] are important instruments for analyzing standard and non-standard short distance events. They are the Summa of most QCD theoretical results and many present studies aim to improve their quantitative predictions. Thanks to the QCD factorization structure [5], Monte Carlo programs can be interfaced with hard cross sections involving also non-QCD processes (electroweak, supersymmetric, extra dimension, black holes, ...). In this way, Monte Carlo generators can describe both QCD and non-QCD events at short distances.In this paper I describe the main QCD results which enter the construction of a Monte Carlo generator. They are so many that most of the key points will be recalled in a schematic way, but I hope that this short description could provide an idea of the reliability range of the Monte Carlo generators. For a more detailed description see [6]. Here, aiming to be simple and synthetic, I follow a personal point of view and the focus will be on the Monte Carlo event generator HERWIG [2]. Its general structure is similar to other important Monte Carlo generators [3,4]. In section 2 I present the scheme of the operations performed by Monte Carlo codes for LHC. The fact that the generation of events can be subdivided into successive stages is physically based on QCD factorization properties. The theoretical basis are discusses/recalled in section 3. In section 4 I discuss 1

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Theoretical Aspects of Particle Production

Webber

2000

Particle Production Spanning MeV and TeV Energies

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Specific features of heavy quark production: Local parton-hadron duality approach to heavy particle spectra

Cited by 154 publications

References 56 publications

InclusiveΛc+production ine+e−annihilations at
Aubert¹,
Bóna²,
Boutigny³
et al. 2007
Phys. Rev. D
18
0
7
0
View full text Add to dashboard Cite

InclusiveΛc+production ine+e−annihilations at
Aubert¹,
Bóna²,
Boutigny³
et al. 2007
Phys. Rev. D
18
0
7
0
View full text Add to dashboard Cite

From QCD Lagrangian to Monte Carlo Simulation

Theoretical Aspects of Particle Production

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Specific features of heavy quark production: Local parton-hadron duality approach to heavy particle spectra

Cited by 154 publications

References 56 publications

InclusiveΛc+production ine+e−annihilations atAubert1, Bóna2, Boutigny3 et al. 2007Phys. Rev. D18070View full textAdd to dashboardCite

InclusiveΛc+production ine+e−annihilations atAubert1, Bóna2, Boutigny3 et al. 2007Phys. Rev. D18070View full textAdd to dashboardCite

From QCD Lagrangian to Monte Carlo Simulation

Theoretical Aspects of Particle Production

Contact Info

Product

Resources

About

InclusiveΛc+production ine+e−annihilations at
Aubert¹,
Bóna²,
Boutigny³
et al. 2007
Phys. Rev. D
18
0
7
0
View full text Add to dashboard Cite

InclusiveΛc+production ine+e−annihilations at
Aubert¹,
Bóna²,
Boutigny³
et al. 2007
Phys. Rev. D
18
0
7
0
View full text Add to dashboard Cite