Space-time description of hadronization in DIS Taisiya Mineeva Jefferson Lab University of CT NNPS, 26 June 2008.

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Presentation transcript:

Space-time description of hadronization in DIS Taisiya Mineeva Jefferson Lab University of CT NNPS, 26 June 2008

O u t l i n e 1.Physical picture of hadronization 2.Experimental Tools & Observables 3.Data

Hadronization process by which energetic quarks evolve into hadrons.

Confinement process isn’t finished yet, these are colored pairs: How do we get to colorless systems?

Physical picture of hadronization (in vacuum) Production time τ p is time required to form a color singlet prehadron, “lifetime of the deconfined quark”. Formation time h τ f is time required to form full sized hadron.

In-medium hadronization Hadronization can occur outside the medium as well as inside the medium. - partonic multiple scattering→ medium-stimulated gluon emission - prehadron interaction with medium → hadron attenuation

Experimental tools and observables

Semi-Inclusive Deep Inelastic Scattering (SIDIS) proton (P)  *(q ) e(k)e’(k’) ep→ e’π X Q 2 = - q 2 four-momentum transferred by the electron; = E-E’ energy transferred by the electron, = Initial energy of struck quark; z = E hadron / the fraction of the struck quark’s initial energy that is carried by hadron; p T hadron momentum transverse to virtual photon direction; φ angle between lepton scattering plane and photon-hadron plane. X h(P’)

CLAS CEBAF Large Acceptance Spectrometer

Jlab Measurement: CLAS EG2 Targets: deuterium, carbon, iron, lead. Deuterium and solid target in beam simultaneously for improved systematics: Luminosity ~10 34 s -1 cm -2 Beam energies: 4 and 5 GeV electron beam deuterium solid target

Experimental observables 1. Hadronic multiplicity ratio

Experimental observables 2.Transverse momentum broadening ** pTpT h e e’

How long does it take to form a color field of the hadron? Hadrons interact with the medium during formation time t f h Measure t f h via hadron attenuation R h in medium. How long can a light quark remain deconfined? Quark is deconfined, emits gluons during production time t p Measure t p via medium-stimulated Δp T Connection of the production and formation times to the observables

Present and future e+A facilities Courtesy of A.Accardi

Preliminary data from CLAS for π + 6 (12) GeV C, Fe, Pb π +, anticipating data π 0, K 0 … huge luminosity 3D binning! R h multiplicity ration

Can we measure production time = quark lifetime?!

Prehadrons formed on short time scales! = 2 C ρ A L Kopeliovich et al. NPA 740(2004) 211, W.Brooks, Trento workshop talk

- The microscopic information on space-time characteristics of hadronization can now be accessed via DIS using nuclear medium as an analyzer. -Studies of hadronization are characterized by rich complexity (color field restoration, gluon bremsstrahlung, extraction of confinement quantities) -Hadronization mechanisms can be tested, and extraction of production times and formation times is now feasible Conclusion