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π0 - h± Jet Correlations in d + Au Collisions at √SNN = 200 GeV

Xia, Bing
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416584257

Abstract Details

2014, Doctor of Philosophy (PhD), Ohio University, Physics and Astronomy (Arts and Sciences).
Various quark gluon plasma signatures have been experimentally established in Au+Au and Pb+Pb collisions at RHIC and LHC, such as elliptical flow and jet quenching. For decades, the quark gluon plasma was believed not to be created in p+A collisions. However, recent experimental discoveries of collective flow in p+Pb and d+Au collisions indicate a hot nuclear medium and a thermal equilibrium in such small systems. An energy loss analysis would be a good alternative measurement for such pictures. Di-hadron correlation measurements are widely used in jet analysis. In this study, π0 - h± azimuthal correlations and the per trigger yields in d+Au collisions at √SNN = 200 GeV are measured and compared with p+p collisions at the same energy. In order to cancel out part of the systematic uncertainties and measure the subtle jet modifications, a new quantity RI is proposed and measured from data. In central d+Au collisions, RI shows a clear suppression in large zT regions and a delicate enhancement of about 2s in low zT regions. Such jet modifications are qualitatively similar, but in a much smaller scale, to the ones observed in central Au+Au collisions, which are attributed to the jet quenching and energy loss in a quark gluon plasma created in central Au+Au collisions. No theory is available to explain this new experimental phenomenon. To constrain the cold nuclear matter effects, we perform a series of simulations to investigate the possible physics origin of these modifications. Various kT setting in Pythia and Hijing simulations are not able to reproduce the features observed in data. Also, the gluon jet mixing and nuclear modification of the parton distribution unctions are studied. None of them are sufficient to explain the RI modification observed in central d+Au collisions. No significant away-side IdA modifications is observed in peripheral d+Au collisions. This result suggests that previous unexpected RdA enhancement in peripheral d+Au collisions from π0 and jet reconstruction analysis might come from an issue with the determination of Ncoll scale factor instead of a real enhancement in physics data. Regardless of the theoretical origin, the data provide constraints that should be able to set concrete limits on the contributions of various cold nuclear or possibly hot QGP-like effects.
Justin Frantz (Advisor)
Brune Carl (Committee Member)
Hicks Kenneth (Committee Member)
Masson Eric (Committee Member)
232 p.
Nuclear Physics; Physics
Quark Gluon Plasma; d Au collisions; jets; pi0-h azimuthal correlations

Recommended Citations

Citations

  • Xia, B. (2014). π0 - h± Jet Correlations in d + Au Collisions at √SNN = 200 GeV [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416584257

    APA Style (7th edition)

  • Xia, Bing. π0 - h± Jet Correlations in d + Au Collisions at √SNN = 200 GeV. 2014. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416584257.

    MLA Style (8th edition)

  • Xia, Bing. "π0 - h± Jet Correlations in d + Au Collisions at √SNN = 200 GeV." Doctoral dissertation, Ohio University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1416584257

    Chicago Manual of Style (17th edition)

ohiou1416584257
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© 2014, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.
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