Overview of hadronization data at CLAS (Jefferson Lab)
H. Hakobyan 1*, W. Brooks 1, T. Mineeva 2, A. Daniel 3, R. Dupre 4
1 Universidad Tecnica Federico Santa Maria
2 University of Connecticut
3 Ohio University
4 Argonne National Lab/Universite Claude Bernard Lyon 1
The experiment E02-104 (shortly named Eg2) was performed on CLAS detector at Thomas Jefferson National Accelerator Facility (TJNAF, Newport News, VA, USA). During the experiment a data on semi-inclusive production of hadrons in deep-inelastic scattering of electron off Deuterium, Carbon, Iron and Lead nuclei was acquired. These data provide important information about the space-time development of in-medium hadronizaton and give an opportunity to investigate the fragmentation processes as well as quark energy loss scheme in the nuclear medium. The two primary interests are the modification of fragmentation functions and the topic of quark energy loss. The first observable, the hadronic multiplicity ratio, is a measure of the modification of the fragmentation functions. Through modeling it can be related to hadron formation lengths and fragmentation mechanisms. The second observable is the broadening of the distributions in hadron transverse momentum, the transverse momentum broadening. It is expected that the production time of final state hadrons can be estimated from this variable within certain kinematic regions. Measurements are done for different types of hadrons (for positively, negatively and neutral pions as well as for neutral kaons). The full interpretation of our preliminary data analysis is on progress and will be complete after scientific analysis is documented in peer-reviewed publications.