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Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions.
- Author(s): Adare, A
- Afanasiev, S
- Aidala, C
- Ajitanand, NN
- Akiba, Y
- Akimoto, R
- Al-Bataineh, H
- Alexander, J
- Alfred, M
- Al-Jamel, A
- Al-Ta'ani, H
- Angerami, A
- Aoki, K
- Apadula, N
- Aphecetche, L
- Aramaki, Y
- Armendariz, R
- Aronson, SH
- Asai, J
- Asano, H
- Aschenauer, EC
- Atomssa, ET
- Averbeck, R
- Awes, TC
- Azmoun, B
- Babintsev, V
- Bagoly, A
- Bai, M
- Baksay, G
- Baksay, L
- Baldisseri, A
- Bannier, B
- Barish, KN
- Barnes, PD
- Bassalleck, B
- Basye, AT
- Bathe, S
- Batsouli, S
- Baublis, V
- Bauer, F
- Baumann, C
- Baumgart, S
- Bazilevsky, A
- Belikov, S
- Belmont, R
- Bennett, R
- Berdnikov, A
- Berdnikov, Y
- Bhom, JH
- Bickley, AA
- Bjorndal, MT
- Blau, DS
- Boer, M
- Boissevain, JG
- Bok, JS
- Borel, H
- Boyle, K
- Brooks, ML
- Brown, DS
- Bryslawskyj, J
- Bucher, D
- Buesching, H
- Bumazhnov, V
- Bunce, G
- Burward-Hoy, JM
- Butsyk, S
- Camacho, CM
- Campbell, S
- Canoa Roman, V
- Caringi, A
- Castera, P
- Chai, J-S
- Chang, BS
- Chang, WC
- Charvet, J-L
- Chen, C-H
- Chernichenko, S
- Chi, CY
- Chiba, J
- Chiu, M
- Choi, IJ
- Choi, JB
- Choi, S
- Choudhury, RK
- Christiansen, P
- Chujo, T
- Chung, P
- Churyn, A
- Chvala, O
- Cianciolo, V
- Citron, Z
- Cleven, CR
- Cobigo, Y
- Cole, BA
- Comets, MP
- Conesa Del Valle, Z
- Connors, M
- Constantin, P
- Csanád, M
- Csörgő, T
- Dahms, T
- Dairaku, S
- Danchev, I
- Danley, TW
- Das, K
- Datta, A
- Daugherity, MS
- David, G
- Dayananda, MK
- Deaton, MB
- Dehmelt, K
- Delagrange, H
- Denisov, A
- d'Enterria, D
- Deshpande, A
- Desmond, EJ
- Dharmawardane, KV
- Dietzsch, O
- Ding, L
- Dion, A
- Do, JH
- Donadelli, M
- D'Orazio, L
- Drachenberg, JL
- Drapier, O
- Drees, A
- Drees, KA
- Dubey, AK
- Durham, JM
- Durum, A
- Dutta, D
- Dzhordzhadze, V
- Edwards, S
- Efremenko, YV
- Egdemir, J
- Ellinghaus, F
- Emam, WS
- Engelmore, T
- Enokizono, A
- En'yo, H
- Espagnon, B
- Esumi, S
- Eyser, KO
- Fadem, B
- Fan, W
- Feege, N
- Fields, DE
- Finger, M
- Finger, M
- Fleuret, F
- Fokin, SL
- Forestier, B
- Fraenkel, Z
- Frantz, JE
- Franz, A
- Frawley, AD
- Fujiwara, K
- Fukao, Y
- Fung, S-Y
- Fusayasu, T
- Gadrat, S
- Gainey, K
- Gal, C
- Gallus, P
- Garg, P
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- Garishvili, I
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- Hartouni, EP
- Haruna, K
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- Hasegawa, S
- Haseler, TOS
- Hashimoto, K
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- Hasuko, K
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- Huang, S
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- Iinuma, H
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- Khanzadeev, A
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- PHENIX Collaboration
- et al.
Published Web Location
https://doi.org/10.1103/physrevlett.123.022301Abstract
The PHENIX collaboration presents first measurements of low-momentum (0.41 GeV/c) direct-photon yield dN_{γ}^{dir}/dη is a smooth function of dN_{ch}/dη and can be well described as proportional to (dN_{ch}/dη)^{α} with α≈1.25. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different A+A collision systems. At a given beam energy, the scaling also holds for high p_{T} (>5 GeV/c), but when results from different collision energies are compared, an additional sqrt[s_{NN}]-dependent multiplicative factor is needed to describe the integrated-direct-photon yield.