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

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Presentation on theme: "Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 1 Some Slides for Michele There is no subtitle."— Presentation transcript:

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

2 Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 2 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

3 Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 3 “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

4 Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 4 Describes isotropy of energy flow Measure of the summed p 2 T wrt. Sphericity axis SphericitySphericity

5 Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 5 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 

6 Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 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

7 Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 7 Thrust and Sphericity T=1 S=0T=3/4 S=1/2S=1 T=1/2

8 Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 8 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

9 Event Shapes, A. Everett, U. WisconsinZEUS Meeting, March 6, 2003 - 9 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

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