Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions
The PHENIX collaboration presents first measurements of low-momentum (\(0.45\(\,GeV/\)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.
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| creator | Alfred, M Bathe, S Belikov, S Brooks, M L Bumazhnov, V Butsyk, S Campbell, S Caringi, A Churyn, A Cianciolo, V Citron, Z Cobigo, Y Constantin, P Csanád, M Datta, A Dayananda, M K Delagrange, H Dion, A Edwards, S En'yo, H Esumi, S estier, B Fusayasu, T Greene, S V Haruna, K Harvey, M Holzmann, W Iinuma, H Ishihara, M Isobe, T Javani, M Jia, J Kajihara, F Kametani, S Kang, B H Kikuchi, J Kim, C Kim, S H Kinney, E Klatsky, J Kubart, J Kweon, M J Lee, K B Lee, T Leitch, M J Leung, Y H X Li Lökös, S Manion, A Mannel, E McCumber, M McGlinchey, D Meredith, B Mignerey, A C Mihalik, D E Mohanty, A K Morrow, S I Nagae, T Nagata, Y Nagy, M I Nakamiya, Y Nakano, K Norman, B E Nyanin, A S Oakley, C Ogilvie, C A Okada, K Omiwade, O O Palounek, A P T Papavassiliou, V Park, I H Park, J Purschke, M L Radzevich, P V Reynolds, D Riabov, Y Rinn, T Rowan, Z Runchey, J Rykov, V L Semenov, V Soldatov, A Sun, J Themann, H Thomas, D Togawa, M Tojo, J Tomášek, M Tyurin, N Vazquez-Zambrano, E Vértesi, R Vrba, V Walker, D Watanabe, D Watanabe, K Xia, B Yasin, Z Young, G R H Yu Zaudtke, O |
| description | The PHENIX collaboration presents first measurements of low-momentum (\(0.45\(\,GeV/\)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. |
| doi_str_mv | 10.48550/arxiv.1805.04084 |
| format | Article |
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For both beam energies the direct-photon yields are substantially enhanced with respect to expectations from prompt processes, similar to the yields observed in Au\(+\)Au collisions at \(\sqrt{s_{_{NN}}}\)=200. Analyzing the photon yield as a function of the experimental observable \(dN_{\rm ch}/d\eta\) reveals that the low-momentum (\(>\)1\,GeV/\(c\)) direct-photon yield \(dN_{\gamma}^{\rm dir}/d\eta\) is a smooth function of \(dN_{\rm ch}/d\eta\) and can be well described as proportional to \((dN_{\rm ch}/d\eta)^\alpha\) with \(\alpha{\approx}1.25\). 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.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1805.04084</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Beams (radiation) ; Dependence ; Heavy ions ; Ionic collisions ; Large Hadron Collider ; Momentum ; Photon emission ; Physics - High Energy Physics - Experiment ; Physics - Nuclear Experiment ; Relativism ; Relativistic effects ; Relativistic Heavy Ion Collider ; Scaling</subject><ispartof>arXiv.org, 2019-06</ispartof><rights>2019. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>http://arxiv.org/licenses/nonexclusive-distrib/1.0</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,780,784,885,27925</link.rule.ids><backlink>$$Uhttps://doi.org/10.1103/PhysRevLett.123.022301$$DView published paper (Access to full text may be restricted)$$Hfree_for_read</backlink><backlink>$$Uhttps://doi.org/10.48550/arXiv.1805.04084$$DView paper in arXiv$$Hfree_for_read</backlink></links><search><creatorcontrib>Alfred, M</creatorcontrib><creatorcontrib>Bathe, S</creatorcontrib><creatorcontrib>Belikov, S</creatorcontrib><creatorcontrib>Brooks, M L</creatorcontrib><creatorcontrib>Bumazhnov, 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M</creatorcontrib><creatorcontrib>McGlinchey, D</creatorcontrib><creatorcontrib>Meredith, B</creatorcontrib><creatorcontrib>Mignerey, A C</creatorcontrib><creatorcontrib>Mihalik, D E</creatorcontrib><creatorcontrib>Mohanty, A K</creatorcontrib><creatorcontrib>Morrow, S I</creatorcontrib><creatorcontrib>Nagae, T</creatorcontrib><creatorcontrib>Nagata, Y</creatorcontrib><creatorcontrib>Nagy, M I</creatorcontrib><creatorcontrib>Nakamiya, Y</creatorcontrib><creatorcontrib>Nakano, K</creatorcontrib><creatorcontrib>Norman, B E</creatorcontrib><creatorcontrib>Nyanin, A S</creatorcontrib><creatorcontrib>Oakley, C</creatorcontrib><creatorcontrib>Ogilvie, C A</creatorcontrib><creatorcontrib>Okada, K</creatorcontrib><creatorcontrib>Omiwade, O O</creatorcontrib><creatorcontrib>Palounek, A P T</creatorcontrib><creatorcontrib>Papavassiliou, V</creatorcontrib><creatorcontrib>Park, I H</creatorcontrib><creatorcontrib>Park, J</creatorcontrib><creatorcontrib>Purschke, M L</creatorcontrib><creatorcontrib>Radzevich, P V</creatorcontrib><creatorcontrib>Reynolds, D</creatorcontrib><creatorcontrib>Riabov, Y</creatorcontrib><creatorcontrib>Rinn, T</creatorcontrib><creatorcontrib>Rowan, Z</creatorcontrib><creatorcontrib>Runchey, J</creatorcontrib><creatorcontrib>Rykov, V L</creatorcontrib><creatorcontrib>Semenov, V</creatorcontrib><creatorcontrib>Soldatov, A</creatorcontrib><creatorcontrib>Sun, J</creatorcontrib><creatorcontrib>Themann, H</creatorcontrib><creatorcontrib>Thomas, D</creatorcontrib><creatorcontrib>Togawa, M</creatorcontrib><creatorcontrib>Tojo, J</creatorcontrib><creatorcontrib>Tomášek, M</creatorcontrib><creatorcontrib>Tyurin, N</creatorcontrib><creatorcontrib>Vazquez-Zambrano, E</creatorcontrib><creatorcontrib>Vértesi, R</creatorcontrib><creatorcontrib>Vrba, V</creatorcontrib><creatorcontrib>Walker, D</creatorcontrib><creatorcontrib>Watanabe, D</creatorcontrib><creatorcontrib>Watanabe, K</creatorcontrib><creatorcontrib>Xia, B</creatorcontrib><creatorcontrib>Yasin, Z</creatorcontrib><creatorcontrib>Young, G R</creatorcontrib><creatorcontrib>H Yu</creatorcontrib><creatorcontrib>Zaudtke, O</creatorcontrib><title>Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions</title><title>arXiv.org</title><description>The PHENIX collaboration presents first measurements of low-momentum (\(0.4<p_T<3\) GeV/\(c\)) direct-photon yields from Au\(+\)Au collisions at \(\sqrt{s_{_{NN}}}\)=39 and 62.4 GeV. For both beam energies the direct-photon yields are substantially enhanced with respect to expectations from prompt processes, similar to the yields observed in Au\(+\)Au collisions at \(\sqrt{s_{_{NN}}}\)=200. Analyzing the photon yield as a function of the experimental observable \(dN_{\rm ch}/d\eta\) reveals that the low-momentum (\(>\)1\,GeV/\(c\)) direct-photon yield \(dN_{\gamma}^{\rm dir}/d\eta\) is a smooth function of \(dN_{\rm ch}/d\eta\) and can be well described as proportional to \((dN_{\rm ch}/d\eta)^\alpha\) with \(\alpha{\approx}1.25\). 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.</description><subject>Beams (radiation)</subject><subject>Dependence</subject><subject>Heavy ions</subject><subject>Ionic collisions</subject><subject>Large Hadron Collider</subject><subject>Momentum</subject><subject>Photon emission</subject><subject>Physics - High Energy Physics - Experiment</subject><subject>Physics - Nuclear Experiment</subject><subject>Relativism</subject><subject>Relativistic effects</subject><subject>Relativistic Heavy Ion Collider</subject><subject>Scaling</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GOX</sourceid><recordid>eNotkE1LAzEURYMgWGp_gCsDrlMzL5OZzFKLWqHgpvshTV5sSubDZFqcf--0dfXu4tzL4xDykPFlrqTkzzr--tMyU1wuec5VfkNmIETGVA5wRxYpHTjnUJQgpZiR8Iq6Ydhi_B6pbi012A5RBz-M1GKPrcXWIO0ctT6iGVi_74aupdj4lPwUXOwaegxTh0UMevAnnwZv6B71aWRnwnQh-DOb7smt0yHh4v_Oyfb9bbtas83Xx-fqZcO0hIrtlMtKXWkLskKlXG6znEsEUYKwzjopVGUKYWEH1jhjZFXkprJ6V2iYmlLMyeN19qKi7qNvdBzrs5L6omQinq5EH7ufI6ahPnTH2E4_1cBLgGlEVOIP0lNmxg</recordid><startdate>20190605</startdate><enddate>20190605</enddate><creator>Alfred, M</creator><creator>Bathe, S</creator><creator>Belikov, S</creator><creator>Brooks, M L</creator><creator>Bumazhnov, V</creator><creator>Butsyk, 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arXiv.org</general><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>L6V</scope><scope>M7S</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20190605</creationdate><title>Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions</title><author>Alfred, M ; Bathe, S ; Belikov, S ; Brooks, M L ; Bumazhnov, V ; Butsyk, S ; Campbell, S ; Caringi, A ; Churyn, A ; Cianciolo, V ; Citron, Z ; Cobigo, Y ; Constantin, P ; Csanád, M ; Datta, A ; Dayananda, M K ; Delagrange, H ; Dion, A ; Edwards, S ; En'yo, H ; Esumi, S ; estier, B ; Fusayasu, T ; Greene, S V ; Haruna, K ; Harvey, M ; Holzmann, W ; Iinuma, H ; Ishihara, M ; Isobe, T ; Javani, M ; Jia, J ; Kajihara, F ; Kametani, S ; Kang, B H ; Kikuchi, J ; Kim, C ; Kim, S H ; Kinney, E ; Klatsky, J ; Kubart, J ; Kweon, M J ; Lee, K B ; Lee, T ; Leitch, M J ; Leung, Y H ; X Li ; Lökös, S ; Manion, A ; Mannel, E ; McCumber, M ; McGlinchey, D ; Meredith, B ; Mignerey, A C ; Mihalik, D E ; Mohanty, A K ; Morrow, S I ; Nagae, T ; Nagata, Y ; Nagy, M I ; Nakamiya, Y ; Nakano, K ; Norman, B E ; Nyanin, A S ; Oakley, C ; Ogilvie, C A ; Okada, K ; Omiwade, O O ; Palounek, A P T ; Papavassiliou, V ; Park, I H ; Park, J ; Purschke, M L ; Radzevich, P V ; Reynolds, D ; Riabov, Y ; Rinn, T ; Rowan, Z ; Runchey, J ; Rykov, V L ; Semenov, V ; Soldatov, A ; Sun, J ; Themann, H ; Thomas, D ; Togawa, M ; Tojo, J ; Tomášek, M ; Tyurin, N ; Vazquez-Zambrano, E ; Vértesi, R ; Vrba, V ; Walker, D ; Watanabe, D ; Watanabe, K ; Xia, B ; Yasin, Z ; Young, G R ; H Yu ; Zaudtke, O</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a529-b8f17a9ad259e88f4d1405e23723dfdf5389c63d2b2dcfcc5964c9dab6a2f1753</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Beams (radiation)</topic><topic>Dependence</topic><topic>Heavy ions</topic><topic>Ionic collisions</topic><topic>Large Hadron Collider</topic><topic>Momentum</topic><topic>Photon emission</topic><topic>Physics - High Energy Physics - Experiment</topic><topic>Physics - Nuclear Experiment</topic><topic>Relativism</topic><topic>Relativistic effects</topic><topic>Relativistic Heavy Ion Collider</topic><topic>Scaling</topic><toplevel>online_resources</toplevel><creatorcontrib>Alfred, M</creatorcontrib><creatorcontrib>Bathe, S</creatorcontrib><creatorcontrib>Belikov, S</creatorcontrib><creatorcontrib>Brooks, M L</creatorcontrib><creatorcontrib>Bumazhnov, V</creatorcontrib><creatorcontrib>Butsyk, S</creatorcontrib><creatorcontrib>Campbell, S</creatorcontrib><creatorcontrib>Caringi, A</creatorcontrib><creatorcontrib>Churyn, A</creatorcontrib><creatorcontrib>Cianciolo, V</creatorcontrib><creatorcontrib>Citron, Z</creatorcontrib><creatorcontrib>Cobigo, Y</creatorcontrib><creatorcontrib>Constantin, P</creatorcontrib><creatorcontrib>Csanád, M</creatorcontrib><creatorcontrib>Datta, A</creatorcontrib><creatorcontrib>Dayananda, M K</creatorcontrib><creatorcontrib>Delagrange, H</creatorcontrib><creatorcontrib>Dion, A</creatorcontrib><creatorcontrib>Edwards, S</creatorcontrib><creatorcontrib>En'yo, H</creatorcontrib><creatorcontrib>Esumi, S</creatorcontrib><creatorcontrib>estier, B</creatorcontrib><creatorcontrib>Fusayasu, T</creatorcontrib><creatorcontrib>Greene, S V</creatorcontrib><creatorcontrib>Haruna, K</creatorcontrib><creatorcontrib>Harvey, M</creatorcontrib><creatorcontrib>Holzmann, W</creatorcontrib><creatorcontrib>Iinuma, H</creatorcontrib><creatorcontrib>Ishihara, M</creatorcontrib><creatorcontrib>Isobe, T</creatorcontrib><creatorcontrib>Javani, M</creatorcontrib><creatorcontrib>Jia, J</creatorcontrib><creatorcontrib>Kajihara, F</creatorcontrib><creatorcontrib>Kametani, S</creatorcontrib><creatorcontrib>Kang, B H</creatorcontrib><creatorcontrib>Kikuchi, J</creatorcontrib><creatorcontrib>Kim, C</creatorcontrib><creatorcontrib>Kim, S H</creatorcontrib><creatorcontrib>Kinney, E</creatorcontrib><creatorcontrib>Klatsky, J</creatorcontrib><creatorcontrib>Kubart, J</creatorcontrib><creatorcontrib>Kweon, M J</creatorcontrib><creatorcontrib>Lee, K B</creatorcontrib><creatorcontrib>Lee, T</creatorcontrib><creatorcontrib>Leitch, M J</creatorcontrib><creatorcontrib>Leung, Y H</creatorcontrib><creatorcontrib>X Li</creatorcontrib><creatorcontrib>Lökös, S</creatorcontrib><creatorcontrib>Manion, A</creatorcontrib><creatorcontrib>Mannel, E</creatorcontrib><creatorcontrib>McCumber, M</creatorcontrib><creatorcontrib>McGlinchey, D</creatorcontrib><creatorcontrib>Meredith, B</creatorcontrib><creatorcontrib>Mignerey, A C</creatorcontrib><creatorcontrib>Mihalik, D E</creatorcontrib><creatorcontrib>Mohanty, A K</creatorcontrib><creatorcontrib>Morrow, S I</creatorcontrib><creatorcontrib>Nagae, T</creatorcontrib><creatorcontrib>Nagata, Y</creatorcontrib><creatorcontrib>Nagy, M I</creatorcontrib><creatorcontrib>Nakamiya, Y</creatorcontrib><creatorcontrib>Nakano, K</creatorcontrib><creatorcontrib>Norman, B E</creatorcontrib><creatorcontrib>Nyanin, A S</creatorcontrib><creatorcontrib>Oakley, C</creatorcontrib><creatorcontrib>Ogilvie, C A</creatorcontrib><creatorcontrib>Okada, K</creatorcontrib><creatorcontrib>Omiwade, O O</creatorcontrib><creatorcontrib>Palounek, A P T</creatorcontrib><creatorcontrib>Papavassiliou, V</creatorcontrib><creatorcontrib>Park, I H</creatorcontrib><creatorcontrib>Park, J</creatorcontrib><creatorcontrib>Purschke, M L</creatorcontrib><creatorcontrib>Radzevich, P V</creatorcontrib><creatorcontrib>Reynolds, D</creatorcontrib><creatorcontrib>Riabov, Y</creatorcontrib><creatorcontrib>Rinn, T</creatorcontrib><creatorcontrib>Rowan, Z</creatorcontrib><creatorcontrib>Runchey, J</creatorcontrib><creatorcontrib>Rykov, V L</creatorcontrib><creatorcontrib>Semenov, V</creatorcontrib><creatorcontrib>Soldatov, A</creatorcontrib><creatorcontrib>Sun, J</creatorcontrib><creatorcontrib>Themann, H</creatorcontrib><creatorcontrib>Thomas, D</creatorcontrib><creatorcontrib>Togawa, M</creatorcontrib><creatorcontrib>Tojo, J</creatorcontrib><creatorcontrib>Tomášek, M</creatorcontrib><creatorcontrib>Tyurin, N</creatorcontrib><creatorcontrib>Vazquez-Zambrano, E</creatorcontrib><creatorcontrib>Vértesi, R</creatorcontrib><creatorcontrib>Vrba, V</creatorcontrib><creatorcontrib>Walker, D</creatorcontrib><creatorcontrib>Watanabe, D</creatorcontrib><creatorcontrib>Watanabe, K</creatorcontrib><creatorcontrib>Xia, B</creatorcontrib><creatorcontrib>Yasin, Z</creatorcontrib><creatorcontrib>Young, G R</creatorcontrib><creatorcontrib>H Yu</creatorcontrib><creatorcontrib>Zaudtke, O</creatorcontrib><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Access via ProQuest (Open Access)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>arXiv.org</collection><jtitle>arXiv.org</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Alfred, M</au><au>Bathe, S</au><au>Belikov, S</au><au>Brooks, M L</au><au>Bumazhnov, V</au><au>Butsyk, S</au><au>Campbell, S</au><au>Caringi, A</au><au>Churyn, A</au><au>Cianciolo, V</au><au>Citron, Z</au><au>Cobigo, Y</au><au>Constantin, P</au><au>Csanád, M</au><au>Datta, A</au><au>Dayananda, M K</au><au>Delagrange, H</au><au>Dion, A</au><au>Edwards, S</au><au>En'yo, H</au><au>Esumi, S</au><au>estier, B</au><au>Fusayasu, T</au><au>Greene, S V</au><au>Haruna, K</au><au>Harvey, M</au><au>Holzmann, W</au><au>Iinuma, H</au><au>Ishihara, M</au><au>Isobe, T</au><au>Javani, M</au><au>Jia, J</au><au>Kajihara, F</au><au>Kametani, S</au><au>Kang, B H</au><au>Kikuchi, J</au><au>Kim, C</au><au>Kim, S H</au><au>Kinney, E</au><au>Klatsky, J</au><au>Kubart, J</au><au>Kweon, M J</au><au>Lee, K B</au><au>Lee, T</au><au>Leitch, M J</au><au>Leung, Y H</au><au>X Li</au><au>Lökös, S</au><au>Manion, A</au><au>Mannel, E</au><au>McCumber, M</au><au>McGlinchey, D</au><au>Meredith, B</au><au>Mignerey, A C</au><au>Mihalik, D E</au><au>Mohanty, A K</au><au>Morrow, S I</au><au>Nagae, T</au><au>Nagata, Y</au><au>Nagy, M I</au><au>Nakamiya, Y</au><au>Nakano, K</au><au>Norman, B E</au><au>Nyanin, A S</au><au>Oakley, C</au><au>Ogilvie, C A</au><au>Okada, K</au><au>Omiwade, O O</au><au>Palounek, A P T</au><au>Papavassiliou, V</au><au>Park, I H</au><au>Park, J</au><au>Purschke, M L</au><au>Radzevich, P V</au><au>Reynolds, D</au><au>Riabov, Y</au><au>Rinn, T</au><au>Rowan, Z</au><au>Runchey, J</au><au>Rykov, V L</au><au>Semenov, V</au><au>Soldatov, A</au><au>Sun, J</au><au>Themann, H</au><au>Thomas, D</au><au>Togawa, M</au><au>Tojo, J</au><au>Tomášek, M</au><au>Tyurin, N</au><au>Vazquez-Zambrano, E</au><au>Vértesi, R</au><au>Vrba, V</au><au>Walker, D</au><au>Watanabe, D</au><au>Watanabe, K</au><au>Xia, B</au><au>Yasin, Z</au><au>Young, G R</au><au>H Yu</au><au>Zaudtke, O</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions</atitle><jtitle>arXiv.org</jtitle><date>2019-06-05</date><risdate>2019</risdate><eissn>2331-8422</eissn><abstract>The PHENIX collaboration presents first measurements of low-momentum (\(0.4<p_T<3\) GeV/\(c\)) direct-photon yields from Au\(+\)Au collisions at \(\sqrt{s_{_{NN}}}\)=39 and 62.4 GeV. For both beam energies the direct-photon yields are substantially enhanced with respect to expectations from prompt processes, similar to the yields observed in Au\(+\)Au collisions at \(\sqrt{s_{_{NN}}}\)=200. Analyzing the photon yield as a function of the experimental observable \(dN_{\rm ch}/d\eta\) reveals that the low-momentum (\(>\)1\,GeV/\(c\)) direct-photon yield \(dN_{\gamma}^{\rm dir}/d\eta\) is a smooth function of \(dN_{\rm ch}/d\eta\) and can be well described as proportional to \((dN_{\rm ch}/d\eta)^\alpha\) with \(\alpha{\approx}1.25\). 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.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.1805.04084</doi><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | EISSN: 2331-8422 |
| ispartof | arXiv.org, 2019-06 |
| issn | 2331-8422 |
| language | eng |
| recordid | cdi_arxiv_primary_1805_04084 |
| source | arXiv.org; Free E- Journals |
| subjects | Beams (radiation) Dependence Heavy ions Ionic collisions Large Hadron Collider Momentum Photon emission Physics - High Energy Physics - Experiment Physics - Nuclear Experiment Relativism Relativistic effects Relativistic Heavy Ion Collider Scaling |
| title | Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions |
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