Measurement of the differential cross section ddt in

Measurement of the differential cross section dσ/dt in elastic antiproton-proton scattering at V. Šimák

Motivation Elastic scattering - first results in any hadrons' experiment 7/5/2012 V. Šimák, D

Several phenomenology models: -Geometrical scaling -Clouds structure -……. L. M. Dremin: a. Xiv. 1206.

In Run II at Tevatron: D 0 + PFD (2002) Covered regions for scattered

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 5

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 6

FPD scintillating fiber detector Layers 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague

Comparison of detector y coordinates In the spectrometers Pu and Pd Difference in reconstructed

Monte Carlo comparison Trigger efficiencies for detectors: 50% to 70% 7/5/2012 V. Šimák, D

Position of detector with respect to beam center Primary vertex reconstruction 7/5/2012 V. Šimák,

The correlation plots y-p vs y-ap for the first detectors. The dashed lines correspond

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 12

Trigger efficiencies for first four detectors: 50% to 70% 7/5/2012 V. Šimák, D 0

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 14

dn/dt raw signal selection , background , applied acceptance, applied eff. and acceptance: 7/5/2012

Results A. Brandt, C. Avila Change of slope at b = 16. 86 ±

Comparison of result with other experiments Measurement of elastic scattering with FPD cover larger

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 18

TEVATRON and D 0 detector have finished all data collection but the analyses of

Thank you 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 20

Slides: 20

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Measurement of the differential cross section dσ/dt in elastic antiproton-proton scattering at V. Šimák D 0 experiment and CTU Prague for D 0 experiment 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 1

Motivation Elastic scattering - first results in any hadrons' experiment 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 2

Several phenomenology models: -Geometrical scaling -Clouds structure -……. L. M. Dremin: a. Xiv. 1206. 5474 v 1 [hep] 24. Jan. 1012 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 3

In Run II at Tevatron: D 0 + PFD (2002) Covered regions for scattered protons/antiprotons 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 4

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 5

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 6

FPD scintillating fiber detector Layers 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 7

Comparison of detector y coordinates In the spectrometers Pu and Pd Difference in reconstructed t between proton and antiproton, comparison of Monte Carlo with the data 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 8

Monte Carlo comparison Trigger efficiencies for detectors: 50% to 70% 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 9

Position of detector with respect to beam center Primary vertex reconstruction 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 10

The correlation plots y-p vs y-ap for the first detectors. The dashed lines correspond to the fiducially requirements applied 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 11

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 12

Trigger efficiencies for first four detectors: 50% to 70% 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 13

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 14

dn/dt raw signal selection , background , applied acceptance, applied eff. and acceptance: 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague V. Hynek 15

Results A. Brandt, C. Avila Change of slope at b = 16. 86 ± 0. 10 (stat) ± 0. 20 (sys) 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague Fermilab-Pub-12 -263 -E Submitted to PRD 16

Comparison of result with other experiments Measurement of elastic scattering with FPD cover larger and higher that experiments: UA 4, UA 8, CDF 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 17

7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 18

TEVATRON and D 0 detector have finished all data collection but the analyses of full set of data is continuing 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 19

Thank you 7/5/2012 V. Šimák, D 0 FNAL and CTU Prague 20