Fragmentation functions for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msubsup><mml:mi>K</mml:mi><mml:mi>S</mml:mi><mml:mn>0</mml:mn></mml:msubsup></mml:math> and Λ with complete quark flavour separation

Albino, S.; Kniehl, Bernd A.; Krämer, G.

doi:10.1016/j.nuclphysb.2005.11.006

Cited by 39 publications

(19 citation statements)

References 36 publications

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“…To date, such global fits have been performed to NLO in the FO approach [31][32][33]. Our calculation of the SL contributions can be incorporated into such fits using the consistent approach of Ref.…”

Section: Discussionmentioning

confidence: 99%

Timelike single-logarithm-resummed splitting functions

et al. 2012

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We calculate the single logarithmic contributions to the quark singlet and gluon matrix of timelike splitting functions at all orders in the modified minimal-subtraction (MS) scheme. We fix two of the degrees of freedom of this matrix from the analogous results in the massive-gluon regularization scheme by using the relation between that scheme and the MS scheme. We determine this scheme transformation from the double logarithmic contributions to the timelike splitting functions and the coefficient functions of inclusive particle production in e + e − annihilation now available in both schemes. This approach fixes two of the four degrees of freedom, and a third degree of freedom is fixed by reasonable physical assumptions. The results agree with the fixed-order results at next-tonext-to-leading order in the literature.

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Section: Discussionmentioning

confidence: 99%

Timelike single-logarithm-resummed splitting functions

et al. 2012

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“…Since our previous fits [1,4], a number of measurements have been published by collaborations at RHIC and by the CDF collaboration at the Tevatron, which allow for a number of extensions in the knowledge of fragmentation: Because the gluon FF only appears at next-to-leading-order (NLO) in the e + e − → h ± + X cross section but at leading order (LO) in the pp(p) → h ± + X cross section, inclusion of these data in the purely e + e − sample would significantly improve the constraints on gluon fragmentation, and may therefore give an FF set suitable for predictions of future measurements at e.g. the LHC and RHIC.…”

Section: Introductionmentioning

confidence: 96%

“…[1,4]. Small x divergences can be resummed within the framework of DGLAP evolution [8], which is crucial for improving the description at small x.…”

Section: Introductionmentioning

confidence: 99%

“…energy √ s to be added to the data sample to be fitted to, and the results convincingly demonstrate both the accuracy of the fixed order approach and, particularly for baryons, the fact that hadron mass effects are the most relevant small x, low √ s effects. In this paper we repeat the AKK fits of FFs for π ± , K ± , p/p [1], K 0 S and Λ/Λ [4] to inclusive production measurements for these particles. Those fits were intended to be conservative, in that we used only data for which the corresponding calculations are reliable.…”

Section: Introductionmentioning

confidence: 99%

“…Note that Sections II and III are intended to complement rather than repeat the discussions in Refs. [1,4]. All results are presented in Section IV, and finally the work is summarized in Section V.…”

Section: Introductionmentioning

confidence: 99%

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AKK update: Improvements from new theoretical input and experimental data

2008

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We perform a number of improvements to the previous AKK extraction of fragmentation functions for π ± , K ± , p/p, K 0 S and Λ/Λ particles at next-to-leading order. Inclusive hadron production measurements from pp(p) reactions at BRAHMS, CDF, PHENIX and STAR are added to the data sample. We use the charge-sign asymmetry of the produced hadrons in pp reactions to constrain the valence quark fragmentations. Data from e + e − reactions in regions of smaller x and lower √ s are added. Hadron mass effects are treated for all observables and, for each particle, the hadron mass used for the description of the e + e − reaction is fitted. The baryons' fitted masses are found to be only around 1% above their true masses, while the values of the mesons' fitted masses have the correct order of magnitude. Large x resummation is applied in the coefficient functions of the e + e − reactions, and also in the evolution of the fragmentation functions, which in most cases results in a significant reduction of the minimized χ 2 . To further exploit the data, all published normalization errors are incorporated via a correlation matrix.

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Scaled momentum distributions for $ K_S^0 $KS and $ \Lambda /\bar{\Lambda } $ in DIS at HERA

Abramowicz¹,

Abt²,

Adamczyk³

et al. 2012

J. High Energ. Phys.

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Scaled momentum distributions for the strange hadrons K 0 S and Λ/Λ were measured in deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 330 pb −1 . The evolution of these distributions with the photon virtuality, Q 2 , was studied in the kinematic region 10 < Q 2 < 40000 GeV 2 and 0.001 < x < 0.75, where x is the Bjorken scaling variable. Clear scaling violations are observed. Predictions based on different approaches to fragmentation were compared to the measurements. Leading-logarithm parton-shower Monte Carlo calculations interfaced to the Lund string fragmentation model describe the data reasonably well in the whole range measured. Nextto-leading-order QCD calculations based on fragmentation functions, FFs, extracted from e + e − data alone, fail to describe the measurements. The calculations based on FFs extracted from a global analysis including e + e − , ep and pp data give an improved description. The measurements presented in this paper have the potential to further constrain the FFs of quarks, anti-quarks and gluons yielding K 0 S and Λ/Λ strange hadrons.

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Fragmentation functions for KS0 and Λ with complete quark flavour separation

Cited by 39 publications

References 36 publications

Timelike single-logarithm-resummed splitting functions

Timelike single-logarithm-resummed splitting functions

AKK update: Improvements from new theoretical input and experimental data

Scaled momentum distributions for $ K_S^0 $KS and $ \Lambda /\bar{\Lambda } $ in DIS at HERA

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