Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 1 Some Slides for Michele There is no subtitle.

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Presentation transcript:

Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, Some Slides for Michele There is no subtitle

Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, Current Hemisphere of Breit Frame e - p + : Breit frame photon is space like  Quark’s hadronization products in current hemisphere Lab Frame Breit Frame DIS Event PTPT PLPL

Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, “The Brick Wall Frame” In leading order: struck quark turns around  Single jet event: jet has no E T Dijet event: jets balanced in E T Breit Frame : helps with multijet identification Study Jets in Breit Frame

Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, Describes isotropy of energy flow Measure of the summed p 2 T wrt. Sphericity axis SphericitySphericity

Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, Thrust in DIS Linear collimation of hadronic system along a specified (“thrust”) axis T interpretation depends on choice of axis: n for T T axis Photon axis = n : T 

Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, Energy Flow and Dijets Instead of inclusive events, we use dijets in the current region of the Breit frame. Dijets: pQCD part of calculation well understood Event topology well understood New Event Shape Variables: K out, Azimuthal Correlation Must define an event plane in the Breit frame Use Thrust to define the event plane Transverse Energy Flow T T axis T M axis T Z axis T m axis axis

Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, Thrust and Sphericity T=1 S=0T=3/4 S=1/2S=1 T=1/2

Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, Approach to Non-Perturbative Calculations pQCD prediction → measured distribution Correction factors for non-perturbative (soft) QCD effects Recent theory reduces corrections for any infrared safe event shape variable, F: Power Correction independent of any fragmentation assumptions “non-perturbative parameter” – (Dokshitzer, Webber, Phys. Lett. B 352(1995)451) Used to determine the hadronization corrections

Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, Kinematic Bins Analysis conducted in 8 bins of Q 2 Lowest two Q 2 bins are divided into two bins of x Two studies: Means of each variable in each bin Differential distributions of each variable in each bin