Relativistic corrections for polarized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi></mml:math>production in<b><i>b</i></b>decay

P., J.

doi:10.1103/physrevd.62.054012

Phys. Rev. D

2000

DOI: 10.1103/physrevd.62.054012

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Relativistic corrections for polarizedJ/ψproduction inbdecay

J. P.

Abstract: We analyze the structure of relativistic corrections in the inclusive production of polarized J/ from b-quark decay. The analysis is performed not only for the production channel in which the cc pair is a color singlet, but also for the channels in which the cc is a color octet. We find that the correction in the color-singlet channel at tree level is completely determined by the decay constant of J/, while in the color-octet channels the corrections are characterized by three matrix elements defined in NRQCD,… Show more

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Cited by 9 publications

(1 citation statement)

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“…These calculations rely on a set of process-independent long-distance matrix elements (LDME's), which also appear in NRQCD calculations of production in B decays. The polarization of produced from B decays [6,7] is sensitive to the coloroctet LDME's; however, these calculations have been done only to leading order. The momentum distribution of produced in B decays [8][9][10] is also sensitive to the dominant color-octet terms, particularly at low p .…”

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confidence: 99%

Measurements of InclusiveB→ψProduction

Anderson¹,

Frolov²,

Kubota³

et al. 2002

Phys. Rev. Lett.

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Using the combined CLEO II and CLEO II.V data sets of 9.1 fb(-1) at the Upsilon(4S), we measure properties of psi mesons produced directly from decays of the B meson, where "B" denotes an admixture of B+, B-, B0, and B;(0), and "psi" denotes either J/psi(1S) or psi(2S). We report first measurements of psi polarization in B-->psi(direct)X: alpha(psi(1S))=-0.30(+0.07)(-0.06)+/-0.04 and alpha(psi(2S))=-0.45(+0.22)(-0.19)+/-0.04. We also report improved measurements of the momentum distributions of psi produced directly from B decays, correcting for measurement smearing. Finally, we report measurements of the inclusive branching fraction for B-->psiX and B-->chi(c1)X.

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mentioning

confidence: 99%

Measurements of InclusiveB→ψProduction

Anderson¹,

Frolov²,

Kubota³

et al. 2002

Phys. Rev. Lett.

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Spin-flip interactions and the puzzle of s polarization at Tevatron

Liu

2007

Physics Letters B

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Nonrelativistic QCD provides a systematic approach for inclusive decays and productions of a quarkonium. By taking color-octet components into account, the approach can explain the ψ ′ -anomaly at Tevatron, where the measured production rate at large transverse momentum p ⊥ is in order of magnitude larger than the predicted with color-singlet components only. With the approach one can predict that the produced J/ψ and ψ ′ at large p ⊥ will be transversely polarized. But the prediction fails in confronting with experimental measurements and this generates a puzzle. We examine the role of spin-flip interactions in the spin density matrix of the transition of a color-octet charm quark pair into J/ψ and ψ ′ . These interactions will introduce new nonperturbative parameters in the spin density matrix. Our result shows that the impact of the interactions is always to dilute the polarization and can be very significant. Taking the impact into account, predictions for the polarization are more close to the measured than the previous predicted. The same can also be expected for the polarization of J/ψ. Quarkonia with their rich dynamics at different energy scales provide a special place to understand QCD. With its heavy mass m a heavy quark Q will move with a small velocity v inside a quarkonium. This results in a hierarchy of energy scales m >> mv >> mv 2 and the dynamics at different energy scales is different. A systematical separation of effects from the dynamics at different energy scales will provide a systematic understanding of quarkonium physics. Indeed, nonrelativistic QCD (NRQCD) provides such a systematic approach for inclusive decay and production [1]. In this approach a factorization can be made by expanding the small v to do the separation, a power counting in v based on the hierarchy is obtained to determine which nonperturbative effects, represented by NRQCD matrix elements, are relevant [1,2]. A comprehensive review of quarkonium physics can be found in [3]. In this approach, effects of higher-Fock components of a quarkonium state can be taken into account systematically. Although the probability to find such higher-Fock components is suppressed, but the effects of these higher-Fock states can be very significant. This has been shown in the explanation of the ψ ′ -anomaly at Tevatron, where the inclusive ψ ′production rates with large transverse momentum p ⊥ are in order of magnitude larger than the predicted if one only takes the main Fock state into account. By taking color-octet QQ components into account, the Tevatron data[4] can be explained [5]. This is regarded as a great triumph of the NRQCD approach.Despite many successes of the approach, some problems still remain unsolved. Among them a crucial one is that the approach fails to predict the polarization of J/ψ and ψ ′ at large p ⊥ measured at Tevatron. At large p ⊥ , the production of J/ψ and ψ ′ is dominant by the gluon fragmentation in which a gluon fragments into a color-octet cc pair in 3 S 1 state, the color-octet cc pair is then transmitte...

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Diffractive D production in charged current DIS

Song¹,

Chao²

2002

Physics Letters B

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We present a perturbative QCD calculation of diffractive D s production in charged current deep inelastic scattering. In the two-gluon exchange model, we analyze the diffractive process νN → µ − N D + s , which may provide useful information for the gluon structure of nucleons and the diffraction mechanism in QCD. The cross section of diffractive D s production with x Bj = 0.005-0.05 and E ν = 50 Gev is found to be 2.7 × 10 −5 pb. In spite of this small cross section, the high luminosity available at the ν-Factory in the future would lead to a sizable number of diffraction events.

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Relativistic corrections for polarizedJ/ψproduction inbdecay

Cited by 9 publications

References 12 publications

Measurements of InclusiveB→ψProduction

Measurements of InclusiveB→ψProduction

Spin-flip interactions and the puzzle of s polarization at Tevatron

Diffractive D production in charged current DIS

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