scholarly journals Charged-meson production and scaling violations of fragmentation functions in deeply inelastic scattering at HERA

1997 ◽  
Vol 406 (1-2) ◽  
pp. 178-183 ◽  
Author(s):  
Dirk Graudenz
Keyword(s):  
Inelastic Scattering ◽  
Meson Production ◽  
Charged Meson ◽  
Fragmentation Functions ◽  
Scaling Violations

scholarly journals Production asymmetry of open charm mesons within unfavoured ragmentation scenario

2019 ◽  
Vol 199 ◽  
pp. 04007
Author(s):  
Rafał Maciuła
Keyword(s):  
Light Quark ◽  
Atmospheric Neutrino ◽  
Neutrino Flux ◽  
Meson Production ◽  
Lhcb Collaboration ◽  
Charm Mesons ◽  
Measured Asymmetry ◽  
Fragmentation Probability ◽  
Fragmentation Functions ◽  
Production Asymmetry

We consider unfavoured light quark/antiquark to D meson fragmentation. We discuss nonperturbative effects for small transverse momenta. The asymmetry for D+ and D- production measured by the LHCb collaboration provides natural constraints on the parton (quark/antiquark) fragmentation functions. We find that already a fraction of $q/\overline q \to D$ fragmentation probability is sufficient to account for the measured asymmetry. Large D-meson production asymmetries are found for large xF which is related to dominance of light quark/antiquark $q/\overline q \to D$ fragmentation over the standard c → D fragmentation. As a consequence, prompt atmospheric neutrino flux at high neutrino energies can be much larger than for the conventional c → D fragmentation. The latter can constitute a sizeable background for the cosmic neutrinos claimed to be observed recently by the IceCube Observatory.

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].

The interaction of 970 MeV protons with helium

1960 ◽  
Vol 257 (1290) ◽  
pp. 316-325 ◽  
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Meson Production ◽  
Absorption Cross ◽  
Proton Proton ◽  
Particle Characteristics ◽  
Pressure Diffusion ◽  
Elastic Proton ◽  
Charged Meson ◽  
Mev Protons

The interaction of 970 MeV protons with helium has been studied with a high-pressure diffusion cloud chamber. From 642 events the total and absorption cross-sections were found to be 116 ± 17 mb and 93 ± 13 mb, respectively. These agree with values obtained by extrapolation of known cross-sections for more complex nuclei, and the results are interpreted in terms of the optical model of the nucleus. The angular distribution for elastic-scattering yields an α -particle radius of 1⋅8 x 10 -13 cm. Quasi-elastic proton-proton and proton-neutron scattering, and more particularly charged meson production, show that the α -particle has some individual particle characteristics. Meson reabsorption appears unimportant.

scholarly journals QUARK-CLUSTERING EFFECTS IN NEUTRINO–NUCLEON DEEP INELASTIC SCATTERING

1998 ◽  
Vol 13 (16) ◽  
pp. 2875-2882
Author(s):  
M. ANSELMINO ◽  
V. BARONE ◽  
F. CARUSO ◽  
E. CHEB-TERRAB ◽  
P. C. R. QUINTAIROS
Keyword(s):  
Inelastic Scattering ◽  
Deep Inelastic Scattering ◽  
Parton Model ◽  
Scaling Violations

The deep inelastic scattering of neutrinos on unpolarized nucleons is considered in a generalized parton model which takes into account quark-clustering effects, modeled by diquarks. The diquark contributions are expected to be significant at small Q2 values and to vanish asymptotically, and describe phenomenologically higher twist corrections. The most general case is studied, which includes both scalar and pseudovector diquarks inside the nucleons, as well as the contribution of scalar–vector and vector–scalar transitions. The resulting scaling violations are briefly discussed.

αs from scaling violations in fragmentation functions

2001 ◽  
Vol 96 (1-3) ◽  
pp. 89-93
Author(s):  
B.A. Kniehl ◽  
G. Kramer ◽  
B. Pötter
Keyword(s):  
Fragmentation Functions ◽  
Scaling Violations
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