scholarly journals B -hadron fragmentation functions at next-to-next-to-leading order from a global analysis of e+e− annihilation data

2019 ◽  
Vol 99 (11) ◽  
Author(s):  
Maral Salajegheh ◽  
S. Mohammad Moosavi Nejad ◽  
Hamzeh Khanpour ◽  
Bernd A. Kniehl ◽  
Maryam Soleymaninia
Keyword(s):  
Global Analysis ◽  
Leading Order ◽  
Fragmentation Functions

scholarly journals General helicity formalism for two-hadron production in e+e− annihilation within a TMD approach

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Umberto D’Alesio ◽  
Francesco Murgia ◽  
Marco Zaccheddu
Keyword(s):  
Transverse Momentum ◽  
Hadron Production ◽  
Probabilistic Interpretation ◽  
Leading Order ◽  
Transverse Momentum Dependent ◽  
Factorization Scheme ◽  
Helicity Formalism ◽  
Double Polarization ◽  
Fragmentation Functions ◽  
Polarization Observables

Abstract We present the complete leading-order results for the azimuthal dependences and polarization observables in e+e−→ h1h2 + X processes, where the two hadrons are produced almost back-to-back, within a transverse momentum dependent (TMD) factorization scheme. We consider spinless (or unpolarized) and spin-1/2 hadron production and give the full set of the corresponding quark and gluon TMD fragmentation functions (TMD-FFs). By adopting the helicity formalism, which allows for a more direct probabilistic interpretation, single- and double-polarization cases are discussed in detail. Simplified expressions, useful for phenomenological analyses, are obtained by assuming a factorized Gaussian-like dependence on intrinsic transverse momenta for the TMD-FFs.

scholarly journals COMPASS Measurement of Pion and Kaon Multiplicities and Extraction of Quark Fragmentation Functions into Pions

2016 ◽  
Vol 40 ◽  
pp. 1660027
Author(s):  
Fabienne Kunne
Keyword(s):  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Leading Order ◽  
Data Set ◽  
Quark Fragmentation ◽  
Z Domain ◽  
Fragmentation Functions

We present preliminary COMPASS results on pion and kaon multiplicities produced in semi inclusive deep inelastic scattering of 160[Formula: see text]GeV muons off an isoscalar ([Formula: see text]LiD) target. The results constitute an impressive data set of more than 400 points in p and 400 in K, covering a large x,Q[Formula: see text] and z domain in a fine binning, which will be used in future QCD fits at next to leading order to extract quark fragmentation functions. We show results of a first leading order fit performed to extract the favored and unfavored quark fragmentation functions into pions D[Formula: see text] and D[Formula: see text].

scholarly journals Global analysis of fragmentation functions for protons and charged hadrons

2007 ◽  
Vol 76 (7) ◽  
Author(s):  
Daniel de Florian ◽  
Rodolfo Sassot ◽  
Marco Stratmann
Keyword(s):  
Global Analysis ◽  
Charged Hadrons ◽  
Fragmentation Functions

scholarly journals APPROXIMATE NEXT-TO-LEADING ORDER AND NEXT-TO-NEXT-TO-LEADING ORDER CORRECTIONS

2003 ◽  
Vol 18 (06) ◽  
pp. 957-966
Author(s):  
A. P. CONTOGOURIS ◽  
Z. MEREBASHVILI
Keyword(s):  
Structure Functions ◽  
Critical Examination ◽  
Leading Order ◽  
Kinematic Variable ◽  
Fragmentation Functions

For processes involving structure functions and/or fragmentation functions, arguments that over a range of a proper kinematic variable, there is a part that dominates the next-to-leading order (NLO) corrections, are briefly reviewed. The arguments are tested against more recent NLO and in particular complete next-to-next-to-leading order (NNLO) calculations. A critical examination of when these arguments may not be useful is also presented.

scholarly journals Next-to-leading order determination of fragmentation functions

2001 ◽  
Vol 19 (1) ◽  
pp. 89-98 ◽  
Author(s):  
L. Bourhis ◽  
M. Fontannaz ◽  
J.Ph. Guillet ◽  
M. Werlen
Keyword(s):  
Leading Order ◽  
Fragmentation Functions ◽  
Order Determination

scholarly journals SUSY-like relation of the splitting functions in evolution of gluon and quark jet multiplicities

2018 ◽  
Vol 191 ◽  
pp. 04006
Author(s):  
Anatoly Kotikov
Keyword(s):  
Evolution Equations ◽  
Dglap Evolution ◽  
Leading Order ◽  
Logarithmic Order ◽  
World Data ◽  
Charged Hadrons ◽  
Anomalous Dimensions ◽  
The World ◽  
Fragmentation Functions ◽  
Gluon Fragmentation

We show the new relationship [1] between the anomalous dimensions, resummed through next-to-next-to-leading-logarithmic order, in the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations for the first Mellin moments Dq,g(μ2) of the quark and gluon fragmentation functions, which correspond to the average hadron multiplicities in jets initiated by quarks and gluons, respectively. So far, such relationships have only been known from supersymmetric (SUSY) QCD. Exploiting available next-to-nextto- next-to-leading-order (NNNLO) information on the ratio D+g (μ2)=D+q (μ2) of the dominant plus components, the fit of the world data of Dq,g(μ2) for charged hadrons measured in e+e- annihilation leads to α(5)s (MZ) = 0:1205 +0:0016 -0:0020.

scholarly journals DETERMINATION OF f0(980) STRUCTURE BY FRAGMENTATION FUNCTIONS

2008 ◽  
Vol 23 (27n30) ◽  
pp. 2226-2229
Author(s):  
M. HIRAI ◽  
S. KUMANO ◽  
M. OKA ◽  
K. SUDOH
Keyword(s):  
Internal Structure ◽  
Global Analysis ◽  
Second Moments ◽  
Fragmentation Functions ◽  
Exotic Hadron

We discuss internal structure of an exotic hadron by using fragmentation functions. The fragmentation functions for the f0(980) meson are obtained by a global analysis of e+ + e− → f0 + X data. Quark configuration of the f0(980) could be determined by peak positions and second moments of the obtained fragmentation functions.

scholarly journals Fragmentation functions for pions, kaons, and protons at next-to-leading order

2000 ◽  
Vol 582 (1-3) ◽  
pp. 514-536 ◽  
Author(s):  
B.A. Kniehl ◽  
G. Kramer ◽  
B. Pötter
Keyword(s):  
Leading Order ◽  
Fragmentation Functions
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