Nonprompt direct-photon production in Au+Au collisions at √𝑠𝑁⁢𝑁=200 GeV

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• Autor: N. J. Abdulameer
• Autor: ...
• Autor: Mihael Makek
• Autor: ...
• Autor: L. Zou
• Kolaboracija: PHENIX Collaboration
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

The measurement of the direct-photon spectrum from Au+Au collisions at √𝑠𝑁⁢𝑁=200 GeV is presented by the PHENIX Collaboration using the external-photon-conversion technique for 0%–93% central collisions in a transverse-momentum (𝑝𝑇) range of 0.8–10 GeV/𝑐. An excess of direct photons, above prompt-photon production from hard-scattering processes, is observed for 𝑝𝑇<6GeV/𝑐. Nonprompt direct photons are measured by subtracting the prompt component, which is estimated as 𝑁coll-scaled direct photons from 𝑝+𝑝 collisions at 200 GeV, from the direct-photon spectrum. Results are obtained for 0.8<𝑝𝑇<6.0GeV/𝑐 and suggest that the spectrum has an increasing inverse slope from ≈0.2 to 0.4 GeV/𝑐 with increasing 𝑝𝑇, which indicates a possible sensitivity of the measurement to photons from earlier stages of the evolution of the collision. In addition, like the direct-photon production, the 𝑝𝑇-integrated nonprompt direct-photon yields also follow a power-law scaling behavior as a function of collision-system size. The exponent, 𝛼, for the nonprompt component is found to be consistent with 1.1 with no apparent 𝑝𝑇 dependence.

• Ključne riječi (engleski): Nonprompt direct-photon production; Au+Au collisions
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review C
• Brojčani podaci: vol. 109, br. 4, 044912
• p-ISSN: 2469-9985
• e-ISSN: 2469-9993
• DOI: https://doi.org/10.1103/PhysRevC.109.044912
• URN:NBN: urn:nbn:hr:217:429060
• Datum objave publikacije: 2024
• URL dokumenta: https://link.aps.org/doi/10.1103/PhysRevC.109.044912
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: © 2024 American Physical Society. Received 5 April 2022. Revised 18 December 2023. Accepted 26 January 2024. Published 18 April 2024.
• Datum i vrijeme pohrane: 2024-07-29 12:32:37