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Two-particle correlations in azimuthal angle and pseudorapidity in central $$^7\hbox {Be}+{}^9\hbox {Be}$$ collisions at the CERN Super Proton Synchrotron
A measurement of charged hadron pair correlations in two-dimensional $$\Delta \eta \Delta \phi $$ Δ η Δ ϕ space is presented. The analysis is based on total 30 million central Be + Be collisions observed in the NA61/SHINE detector at the CERN SPS for incident beam momenta of 19 A , 30 A , 40 A , 7...
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Published in: | The European physical journal. C, Particles and fields Particles and fields, 2020-12, Vol.80 (12), Article 1151 |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
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Online Access: | Get full text |
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Summary: | A measurement of charged hadron pair correlations in two-dimensional
$$\Delta \eta \Delta \phi $$
Δ
η
Δ
ϕ
space is presented. The analysis is based on total 30 million central Be + Be collisions observed in the NA61/SHINE detector at the CERN SPS for incident beam momenta of 19
A
, 30
A
, 40
A
, 75
A
, and 150
A
$$\text {Ge} \text {V}/c$$
Ge
/
c
. Measurements were carried out for unlike-sign and like-sign charge hadron pairs independently. The
$$C(\Delta \eta ,\Delta \phi )$$
C
(
Δ
η
,
Δ
ϕ
)
correlation functions were compared with results from a similar analysis on p + p interactions at similar beam momenta per nucleon. General trends of the back-to-back correlations are similar in central Be + Be collisions and p + p interactions, but are suppressed in magnitude due to the increased combinatorial background. Predictions from the
Epos
and UrQMD models are compared to the measurements. Evolution of an enhancement around
$$(\Delta \eta ,\Delta \phi ) = (0,0)$$
(
Δ
η
,
Δ
ϕ
)
=
(
0
,
0
)
with incident energy is observed in central Be + Be collisions. It is not predicted by both models and almost non-existing in proton–proton collisions at the same momentum per nucleon. |
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ISSN: | 1434-6044 1434-6052 |
DOI: | 10.1140/epjc/s10052-020-08675-4 |