A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole

Understand

The nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by the DELPHI detector at LEP.

• Two complementary methods are used to reconstruct the energy of weakly decaying b-hadrons, E^weak_B.
• The average value of x^weak_B = E^weak_B/E_beam is measured to be 0.699 +/- 0.011.
• The resulting x^weak_B distribution is then analysed in the framework of two choices for the perturbative contribution (parton shower and Next to Leading Log QCD calculation) in order to extract measurements of the non-perturbative contribution to be used in studies of b-hadron production in other experimental environments than LEP.