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Isolating the chiral magnetic effect from backgrounds by pair invariant mass

Jie Zhao
(
- Purdue U.
)
,
Hanlin Li
(
- Purdue U. and
- Hua-Zhong U. Sci. Tech.
)
,
Fuqiang Wang
(
- Purdue U. and
- Huzhou U.
)

May 15, 2017

16 pages

Published in:

Eur.Phys.J.C 79 (2019) 2, 168

Published: Feb 25, 2019

e-Print:

1705.05410 [nucl-ex]

DOI:

10.1140/epjc/s10052-019-6671-1

View in:

ADS Abstract Service

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Abstract: (Springer)

Topological gluon configurations in quantum chromodynamics induce quark chirality imbalance in local domains, which can result in the chiral magnetic effect (CME) – an electric charge separation along a strong magnetic field. Experimental searches for the CME in relativistic heavy ion collisions via the charge-dependent azimuthal correlator (

\Delta \gamma

) suffer from large backgrounds arising from particle correlations (e.g. due to resonance decays) coupled with the elliptic anisotropy. We propose differential measurements of the

\Delta \gamma

as a function of the pair invariant mass (

m_\mathrm{inv}

), by restricting to high

m_\mathrm{inv}

thus relatively background free, and by studying the

m_\mathrm{inv}

dependence to separate the possible CME signal from backgrounds. We demonstrate by model studies the feasibility and effectiveness of such measurements for the CME search.

Note:

16 preprint pages 5 figures. v2: added a test with a broad "instanton/sphaleron" peak, and added clarifying texts; v3: added event-shape engineering (and two new figures) and expanded discussions on the low invariant mass region; v4: repeated cautionary discussions in introduction and conclusion sections, published version

25.75.-q
25.75.Gz
25.75.Ld
magnetic field: chiral
effect: magnetic
background: correlation
angular correlation: charge dependence
effect: topological
charge: electric
resonance: decay

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Figures(5)

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