SLIDE 3 ๏A. Vossen (FF overview)
Precision of theory and experiment big
advantage à Complementary to pp SIDIS
¡ Evolution ¡ Transverse momentum dependence in h+Jet
Fragmentation
¡ Gluon FFs ¡ Smaller mass effects at low z ¡ Flavor separation (polarization?)
Flavor structure for FFs of Hyperons and other
hadrons that are difficult to reconstruct in pp and SIDIS
Heavy Quark FFs – Also from H decay? Larger multiplicities: Parity violating FF <
V7: Local strong parity violating effects (next…)
P e t e r S k a n d s
Fragmentation Functions
3
M o n a s h U n i v e r s i t y
z
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
) s c( × /dz σ d
tot.had.
σ 1/
1 10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10
+X Production
±
π →
+
World Data (Sel.) for e
)
9
1 × 3 × A L E P H 9 1 G e V ( 1 5 ) × A R G U S 9 G e V , 1 G e V ( 3 ) × C L E O 1 G e V ( )
10
1 × 5 × D E L P H I 9 1 G e V ( 1 ) × R
a n e t a l . 3 G e V ( )
12
1 × S L D 9 1 G e V ( )
7
1 × 7 × T A S S O 3 4 G e V , 4 4 G e V ( )
6
1 × 2 × T P C 2 9 G e V ( . 4 ) × t h i s m e a s . , B e l l e 1 1 G e V (
+X Production
±
π →
+
World Data (Sel.) for e
Belle has FCC-ee like statistics at 10 GeV High-z binning determined by high-|p| track reco
FCC-ee?
Evolution
Repeatedly emphasised gluon FF poorly constrained: Z→bbg , ZH(→gg): good b-tagging Higher ee energy (than Belle) → reach in z determined by reach in low-|p| track reco
Scaling
Particle ID
- S. Moch (& others): field now moving towards NNLO accuracy: per-cent level errors (or better)
High-Nch performance
Gigi says 1% all the way up to x=1
