定向流法测定介子产生过程及其吸收截面

IF 4.5 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B Pub Date : 2025-09-05 DOI:10.1016/j.physletb.2025.139870

Jan Steinheimer , Tom Reichert , Marcus Bleicher

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引用次数: 0

摘要

结果表明，在sNN=3 GeV的Au+Au碰撞中，核介质中ϕ的产生和吸收截面对ϕ的定向流动非常敏感。这提供了一个新的可观测值来约束独立于其绝对生产速率的φ的介质特性。STAR数据不利于稠密核物质中任何显著的ϕ- n吸收，并且与非常小的ϕ截面相一致，可与真空截面相媲美。与介子和质子定向流动的相似性也表明，φ是与重子一起产生的。

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Determination of the ϕ-meson production process and its absorption cross section via directed flow

It is shown that the directed flow of

ϕ

-mesons in Au+Au collisions at

\sqrt{s_{N N}} = 3

GeV, is sensitive to the production and the absorption cross section of the

ϕ

in a nuclear medium. This provides a new observable to constrain the in-medium properties of the

ϕ

which is independent of its absolute production rate. STAR data disfavor any significant

ϕ

-N absorption in dense nuclear matter and are consistent with a very small cross section of the

ϕ

comparable to the vacuum cross section. The similarity of the

ϕ

-meson and proton directed flow also indicates that the

ϕ

is produced in conjunction with a baryon.

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来源期刊

Physics Letters B 物理-物理：综合

CiteScore

9.10

自引率

6.80%

发文量

647

审稿时长

3 months

期刊介绍： Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.