Longitudinal Double-Spin Asymmetry of Electrons from Heavy by Katsuro Nakamura

By Katsuro Nakamura

In this thesis, the size of double-spin asymmetry for electron creation from heavy taste decays used to be played in a Relativistic Heavy Ion Collider (RHIC) within the PHENIX test at Brookhaven nationwide Laboratory to degree the polarized parton distribution functionality of gluon within the small Bjorken x sector (x~0.01).

For this test, for the 1st time a Hadron Blind Detector (HBD), that's a position-sensitive gasoline Cherenkov counter with gasoline Electron Multiplier whose floor is evaporated by means of CsI, was once hired. This HBD contributes to decreasing the heritage from electron pairs produced through actual and digital photon conversion. in addition, the writer develops a brand new research process for the historical past relief, and the signal-to-background ratio is better via an element of approximately 2.0. utilizing the combo of the HBD and a brand new research process, the double-spin asymmetry of the electron construction with transverse momentum ranging half < pT < 3.0 GeV/c is measured and proven to be zero-consistent in the restrict of the statistical uncertainty of approximately 1%. This end result identifies the constraint of the gluon polarization within the small Bjorken x zone, a global first.

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Additional resources for Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized p + p Collisions at √s = 200 GeV

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R±± is ratio of relative luminosities, which is defined as r−− ≡ L ++ /L −− , r+− ≡ L ++ /L +− , r−+ ≡ L ++ /L −+ . 41) Experimentally, the yields N±± are observable and the beam polarization PA,B and relative luminosity r±± can also be measured as accelerator performance. Therefore, the double-spin asymmetry ALL can be obtained by fitting the observed yield N±± according to Eq. 40 where ALL and N0 are set as two fitting parameters. It is worth to mention that, if the efficiency eff does not depend on the direction of the beam polarization, only the detected yields and the beam polarizations affect the resulting ALL and the ALL is not sensitive to any detection efficiencies.

The HBD is a positionˇ sensitive gas Cerenkov counter, and separates the non-photonic electrons and the photonic electrons by using amplitude of produced cluster charge. We developed new analysis method using this HBD feature as explained in Sect. 2. 6 Heavy Flavor Production in p + p Collisions 43 References 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. J. , Phys. Lett. B 206, 364 (1988) J.

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