2025-09-09 理化学研究所,奈良女子大学
図1 PHENIX検出器群とsPHENIX検出器群
＜関連情報＞
- https://www.riken.jp/press/2025/20250909_1/index.html
- https://link.springer.com/article/10.1007/JHEP08(2025)075
sPHENIX検出器を用いたAu+Au衝突（√ｓNN= 200 GeV）における荷電ハドロン多重度の測定 Measurement of charged hadron multiplicity in Au+Au collisions at √ｓNN = 200 GeV with the sPHENIX detector
The sPHENIX collaboration,M. I. Abdulhamid,U. Acharya,E. R. Adams,G. Adawi,C. A. Aidala,Y. Akiba,M. Alfred,S. Ali,A. Alsayegh,S. Altaf,H. Amedi,D. M. Anderson,V. V. Andrieux,A. Angerami,N. Applegate,H. Aso,S. Aune,B. Azmoun,V. R. Bailey,D. Baranyai,S. Bathe,A. Bazilevsky,S. Bela,… C. Zimmerli
Journal of High Energy Physics Published:12 August 2025
DOI:https://doi.org/10.1007/JHEP08(2025)075
A preprint version of the article is available at arXiv.
Abstract
The pseudorapidity distribution of charged hadrons produced in Au+Au collisions at a center-of-mass energy of √ｓNN = 200 GeV is measured using data collected by the sPHENIX detector. Charged hadron yields are extracted by counting cluster pairs in the inner and outer layers of the Intermediate Silicon Tracker, with corrections applied for detector acceptance, reconstruction efficiency, combinatorial pairs, and contributions from secondary decays. The measured distributions cover |η| < 1.1 across various centralities, and the average pseudorapidity density of charged hadrons at mid-rapidity is compared to predictions from Monte Carlo heavy-ion event generators. This result, featuring full azimuthal coverage at mid-rapidity, is consistent with previous experimental measurements at the Relativistic Heavy Ion Collider, thereby supporting the broader sPHENIX physics program.
