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ThesisBuxton.pdf (12.33 MB)
ETD Abstract Container
Abstract Header
ΛK and Ξ
−
K
±
Femtoscopy in Pb-Pb Collisions at √
s
NN
= 2.76 TeV from the LHC ALICE Collaboration
Author Info
Buxton, Jesse Thomas
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443
Abstract Details
Year and Degree
2019, Doctor of Philosophy, Ohio State University, Physics.
Abstract
The first measurements of the scattering parameters of ΛK pairs in all three charge combinations (ΛK
+
, ΛK
−
, and ΛK
0
S
) are presented. The measurements are achieved through a femtoscopic analysis of ΛK correlations in Pb-Pb collisions at √
s
NN
= 2.76 TeV from ALICE at the LHC. The femtoscopic correlations result from strong final-state interactions, and are fit with a parametrization allowing for both the characterization of the pair emission source and the measurement of the scattering parameters for the particle pairs. The fit assumes a common radius and λ
Fit
parameter for each centrality bin, shared across all ΛK pair systems. Extensive studies with the THERMINATOR 2 event generator allow for the description of the non-femtoscopic background, resulting mainly from collective effects, with unprecedented precision. Furthermore, this model together with HIJING simulations are used to account for contributions from residual correlations induced by feed-down from resonances. In the experimental data, a striking difference is observed in pairs with low relative momenta (
k
* ≤ 100 MeV) between the ΛK
+
and ΛK
−
correlations, and the ΛK
0
S
system exhibits features between the two. The ΛK
+
system exhibits a negative real component of the scattering parameter (ℜ
f
0
), while those of the ΛK
−
and ΛK
0
S
are positive, although the magnitude of that of the ΛK
0
S
is smaller than that of the ΛK
−
. The results suggest an effect arising from different quark-antiquark interactions between the pairs, or from different net strangeness for each system (S=0 for ΛK
+
, and S=−2 for ΛK
−
). To investigate further, we conduct a Ξ
−
K
±
analysis, for which preliminary results are shown. Finally, the ΛK systems exhibit source radii larger than expected from extrapolation from identical particle femtoscopic studies. This effect is interpreted as resulting from the separation in space-time of the single-particle Λ and K source distributions.
Committee
Thomas Humanic (Advisor)
Michael Lisa (Committee Member)
Ulrich Heinz (Committee Member)
Fengyuan Yang (Committee Member)
Pages
275 p.
Subject Headings
Physics
Keywords
Femtoscopy
;
heavy-ion collisions
;
HBT interferometry
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Refworks
EndNote
RIS
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Citations
Buxton, J. T. (2019).
ΛK and Ξ
−
K
±
Femtoscopy in Pb-Pb Collisions at √
s
NN
= 2.76 TeV from the LHC ALICE Collaboration
[Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443
APA Style (7th edition)
Buxton, Jesse.
ΛK and Ξ
−
K
±
Femtoscopy in Pb-Pb Collisions at √
s
NN
= 2.76 TeV from the LHC ALICE Collaboration.
2019. Ohio State University, Doctoral dissertation.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443.
MLA Style (8th edition)
Buxton, Jesse. "ΛK and Ξ
−
K
±
Femtoscopy in Pb-Pb Collisions at √
s
NN
= 2.76 TeV from the LHC ALICE Collaboration." Doctoral dissertation, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555596225005443
Chicago Manual of Style (17th edition)
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Document number:
osu1555596225005443
Download Count:
364
Copyright Info
© 2019, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.