Heavy-flavor electron-muon correlations in p+p and d+Au collisions at sNN−−−−√=200 GeV
Adare, A., Afanasiev, S., Aidala, C., Ajitanand, N.N., Akiba, Y., Al-Bataineh, H., Alexander, J., Angerami, A., Aoki, K., Apadula, N., Kim, D. J., & Rak, J. (2014). Heavy-flavor electron-muon correlations in p+p and d+Au collisions at sNN−−−−√=200 GeV. Physical Review C, 89(3), Article 034915. https://doi.org/10.1103/PhysRevC.89.034915
Published in
Physical Review CAuthors
Aoki, K. |
Date
2014Copyright
©2014 American Physical Society. This is an article whose final and definitive form has been published by American Physical Society.
Background:
Heavy-flavor modification in relativistic
p
(
d
)
+
A
collisions are sensitive to different kinds of
strong-interaction physics ranging from modifications of the nuclear wave function to initial- and final-state
energy loss. Modifications to single heavy-flavor particles and their decay leptons at midrapidity and forward
rapidity are well established at the Relativistic Heavy Ion Collider (RHIC).
Purpose:
This paper presents measurements of azimuthal correlations of electron-muon pairs produced from
heavy-flavor decays, primarily
c
̄
c
,in
√
s
NN
=
200 GeV
p
+
p
and
d
+
Au collision using the PHENIX detector
at RHIC. The electrons are measured at midrapidity while the muons in the pair are measured at forward rapidity,
defined as the direction of the deuteron beam, in order to utilize the deuteron to probe low-
x
partons in the gold
nucleus.
Methods:
This analysis uses the central spectrometer arms for electron identification and forward spectrometer
arms for muon identification. Azimuthal correlations are built in all sign combinations for
e
-
μ
pairs. Subtracting
the like-sign yield from the unlike-sign yield removes the correlations from light flavor decays and conversions.
Results:
Comparing the
p
+
p
results with several different Monte Carlo event generators, we find the results are
consistent with a total charm cross section
σ
c
̄
c
=
538
±
46 (stat)
±
197 (data syst)
±
174 (model syst)
μ
b. These
generators also indicate that the back-to-back peak at
φ
=
π
is dominantly from the leading-order contributions
(gluon fusion), while higher-order processes (flavor excitation and gluon splitting) contribute to the yield at all
φ
. We observe a suppression in the pair yield per collision in
d
+
Au. We find the pair yield suppression factor
for 2
.
7
< φ<
3
.
2radis
J
dA
=
0
.
433
±
0
.
087 (stat)
±
0.135 (syst).
Conclusions:
The
e
-
μ
pairs result from partons at
x
Au
∼
10
−
2
at
Q
2
=
10 GeV
/c
2
at the edge of the shadowing
region. The pair suppression indicates modification to
c
̄
c
pairs for these kinematics in the cold nuclear medium
at RHIC.
...
Publisher
American Physical SocietyISSN Search the Publication Forum
0556-2813Keywords
Original source
http://journals.aps.org/prc/abstract/10.1103/PhysRevC.89.034915Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/23715365
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Except where otherwise noted, this item's license is described as ©2014 American Physical Society. This is an article whose final and definitive form has been published by American Physical Society.
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