Dielectron production at low transverse momentum in Pb-Pb collisions at √sNN=5.02 TeV with ALICE

被引：0

作者：

Lehner, Sebastian ^{[1
]}

机构：

[1] Austrian Acad Sci, Stefan Meyer Inst Subat Phys, Vienna, Austria

来源：

7TH ANNUAL CONFERENCE ON LARGE HADRON COLLIDER PHYSICS, LHCP2019 | 2019年

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D O I：

暂无

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Dielectrons probe a wide range of phenomena in heavy-ion collisions. These include lightand heavy-flavour meson production, thermal radiation and coherent photo-production. The latter process is distinguished by dielectron production at low transverse-pair momentum (p(T,ee)). Transverse momentum spectra of dielectrons in central and peripheral Pb-Pb collisions are extracted and compared to the corresponding expectations. In central collisions the data fit the expected spectrum, which is dominated by semi-leptonic decays of correlated heavy-flavour hadrons. In peripheral collisions, the data exhibit an excess at low pT, ee with respect to hadronic and thermal sources. The observed excess yield is compatible with calculations for dielectron production from coherent photon-photon interactions.

引用

页数：7

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