Correlated pion-proton pair emission off hot and dense QCD matter
In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at \sqrt{s_{NN}} = 2.42 GeV collected with HADES. In this energy regime the population of \Delta(1232) resonances plays an important role in the way energy is distributed...
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| creator | Arnold, O Belounnas, A Belyaev, A Berger-Chen, J C Blanco, A M B"ohmer Bordalo, P Chernenko, S Chlad, L Ciepal, I Deveaux, C Dreyer, J Epple, E Fabbietti, L Fateev, O Filip, P Fonte, P Franco, C Friese, J I Fr"ohlich Galatyuk, T Garzon, J A R Gernh"auser Golubeva, M Greifenhagen, R Guber, F Gumberidze, M Harabasz, S Heinz, T Hennino, T Hlavac, S C H"ohne Holzmann, R Ierusalimov, A Ivashkin, A B K"ampfer Karavicheva, T Kardan, B Koenig, I Koenig, W Kolb, B W Korcyl, G Kornakov, G Kornas, F Kotte, R Kugler, A Kunz, T Kurilkin, A Kurilkin, P Lalik, R Lopes, L Mahmoud, T Maier, L Malige, A Mangiarotti, A Markert, J Maurus, S Michel, J Morozov, S C M"untz Naumann, L Nowakowski, K Parpottas, Y Pechenov, V Petukhov, O Piasecki, K Pietraszko, J Pysz, K Ramstein, B Rathod, N Reshetin, A Rodriguez-Ramos, P Rost, A Sadovsky, A Salabura, P Scheib, T Scozzi, F Seck, F Selyuzhenkov, I Siebenson, J Silva, L Smyrski, J Sobolev, Yu G Spataro, S Spies, S H Str"obele Stroth, J Sturm, C Svoboda, O M Szala Tlusty, P Traxler, M Tsertos, H Usenko, E Wagner, V Wendisch, C Wirth, J Wojcik, D Zanevsky, Y Zumbruch, P |
| description | In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at \sqrt{s_{NN}} = 2.42 GeV collected with HADES. In this energy regime the population of \Delta(1232) resonances plays an important role in the way energy is distributed between intrinsic excitation energy and kinetic energy of the hadrons in the fireball. The triple differential d3N/dM{\pi}pdpTdy distributions of correlated {\pi}p pairs have been determined by subtracting the {\pi}p combinatorial background using an iterative method. The invariant-mass distributions in the \Delta(1232) mass region show strong deviations from a Breit-Wigner function with vacuum width and mass. The yield of correlated pion-proton pairs exhibits a complex isospin, rapidity and transverse-momentum dependence. In the invariant mass range 1.1 < Minv (GeV/c2) < 1.4, the yield is found to be similar for {\pi}+p and {\pi}-p pairs, and to follow a power law ^{\alpha}, where is the mean number of participating nucleons. The exponent {\alpha} depends strongly on the pair transverse momentum (pT) while its pT-integrated and charge-averaged value is {\alpha} = 1.5 \pm 0.08stat \pm 0.2sys. |
| doi_str_mv | 10.48550/arxiv.2012.01351 |
| format | Article |
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In this energy regime the population of \Delta(1232) resonances plays an important role in the way energy is distributed between intrinsic excitation energy and kinetic energy of the hadrons in the fireball. The triple differential d3N/dM{\pi}pdpTdy distributions of correlated {\pi}p pairs have been determined by subtracting the {\pi}p combinatorial background using an iterative method. The invariant-mass distributions in the \Delta(1232) mass region show strong deviations from a Breit-Wigner function with vacuum width and mass. The yield of correlated pion-proton pairs exhibits a complex isospin, rapidity and transverse-momentum dependence. In the invariant mass range 1.1 < Minv (GeV/c2) < 1.4, the yield is found to be similar for {\pi}+p and {\pi}-p pairs, and to follow a power law ^{\alpha}, where is the mean number of participating nucleons. The exponent {\alpha} depends strongly on the pair transverse momentum (pT) while its pT-integrated and charge-averaged value is {\alpha} = 1.5 \pm 0.08stat \pm 0.2sys.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.2012.01351</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Combinatorial analysis ; Correlation analysis ; Fireballs ; Hadrons ; Invariants ; Kinetic energy ; Physics - Nuclear Experiment ; Pions ; Protons ; Transverse momentum</subject><ispartof>arXiv.org, 2020-12</ispartof><rights>2020. 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>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,776,780,881,27902</link.rule.ids><backlink>$$Uhttps://doi.org/10.1016/j.physletb.2021.136421$$DView published paper (Access to full text may be restricted)$$Hfree_for_read</backlink><backlink>$$Uhttps://doi.org/10.48550/arXiv.2012.01351$$DView paper in arXiv$$Hfree_for_read</backlink></links><search><creatorcontrib>Arnold, O</creatorcontrib><creatorcontrib>Belounnas, A</creatorcontrib><creatorcontrib>Belyaev, A</creatorcontrib><creatorcontrib>Berger-Chen, J C</creatorcontrib><creatorcontrib>Blanco, 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L</creatorcontrib><creatorcontrib>Mahmoud, T</creatorcontrib><creatorcontrib>Maier, L</creatorcontrib><creatorcontrib>Malige, A</creatorcontrib><creatorcontrib>Mangiarotti, A</creatorcontrib><creatorcontrib>Markert, J</creatorcontrib><creatorcontrib>Maurus, S</creatorcontrib><creatorcontrib>Michel, J</creatorcontrib><creatorcontrib>Morozov, S</creatorcontrib><creatorcontrib>C M"untz</creatorcontrib><creatorcontrib>Naumann, L</creatorcontrib><creatorcontrib>Nowakowski, K</creatorcontrib><creatorcontrib>Parpottas, Y</creatorcontrib><creatorcontrib>Pechenov, V</creatorcontrib><creatorcontrib>Petukhov, O</creatorcontrib><creatorcontrib>Piasecki, K</creatorcontrib><creatorcontrib>Pietraszko, J</creatorcontrib><creatorcontrib>Pysz, K</creatorcontrib><creatorcontrib>Ramstein, B</creatorcontrib><creatorcontrib>Rathod, N</creatorcontrib><creatorcontrib>Reshetin, A</creatorcontrib><creatorcontrib>Rodriguez-Ramos, P</creatorcontrib><creatorcontrib>Rost, A</creatorcontrib><creatorcontrib>Sadovsky, A</creatorcontrib><creatorcontrib>Salabura, P</creatorcontrib><creatorcontrib>Scheib, T</creatorcontrib><creatorcontrib>Scozzi, F</creatorcontrib><creatorcontrib>Seck, F</creatorcontrib><creatorcontrib>Selyuzhenkov, I</creatorcontrib><creatorcontrib>Siebenson, J</creatorcontrib><creatorcontrib>Silva, L</creatorcontrib><creatorcontrib>Smyrski, J</creatorcontrib><creatorcontrib>Sobolev, Yu G</creatorcontrib><creatorcontrib>Spataro, S</creatorcontrib><creatorcontrib>Spies, S</creatorcontrib><creatorcontrib>H Str"obele</creatorcontrib><creatorcontrib>Stroth, J</creatorcontrib><creatorcontrib>Sturm, C</creatorcontrib><creatorcontrib>Svoboda, O</creatorcontrib><creatorcontrib>M Szala</creatorcontrib><creatorcontrib>Tlusty, P</creatorcontrib><creatorcontrib>Traxler, M</creatorcontrib><creatorcontrib>Tsertos, H</creatorcontrib><creatorcontrib>Usenko, E</creatorcontrib><creatorcontrib>Wagner, V</creatorcontrib><creatorcontrib>Wendisch, C</creatorcontrib><creatorcontrib>Wirth, J</creatorcontrib><creatorcontrib>Wojcik, D</creatorcontrib><creatorcontrib>Zanevsky, Y</creatorcontrib><creatorcontrib>Zumbruch, P</creatorcontrib><title>Correlated pion-proton pair emission off hot and dense QCD matter</title><title>arXiv.org</title><description>In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at \sqrt{s_{NN}} = 2.42 GeV collected with HADES. In this energy regime the population of \Delta(1232) resonances plays an important role in the way energy is distributed between intrinsic excitation energy and kinetic energy of the hadrons in the fireball. The triple differential d3N/dM{\pi}pdpTdy distributions of correlated {\pi}p pairs have been determined by subtracting the {\pi}p combinatorial background using an iterative method. The invariant-mass distributions in the \Delta(1232) mass region show strong deviations from a Breit-Wigner function with vacuum width and mass. The yield of correlated pion-proton pairs exhibits a complex isospin, rapidity and transverse-momentum dependence. In the invariant mass range 1.1 < Minv (GeV/c2) < 1.4, the yield is found to be similar for {\pi}+p and {\pi}-p pairs, and to follow a power law ^{\alpha}, where is the mean number of participating nucleons. The exponent {\alpha} depends strongly on the pair transverse momentum (pT) while its pT-integrated and charge-averaged value is {\alpha} = 1.5 \pm 0.08stat \pm 0.2sys.</description><subject>Combinatorial analysis</subject><subject>Correlation analysis</subject><subject>Fireballs</subject><subject>Hadrons</subject><subject>Invariants</subject><subject>Kinetic energy</subject><subject>Physics - Nuclear Experiment</subject><subject>Pions</subject><subject>Protons</subject><subject>Transverse momentum</subject><issn>2331-8422</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><sourceid>GOX</sourceid><recordid>eNotj0tLw0AUhQdBsNT-AFcOuE6c150kyxKfUBCh-3AzD0xpM3FmKvrvja2rA4ePw_kIueGsVDUAu8f4PXyVgnFRMi6BX5CFkJIXtRLiiqxS2jHGhK4EgFyQdRtidHvMztJpCGMxxZDDSCccInWHIaW5pMF7-hEyxdFS68bk6Hv7QA-Ys4vX5NLjPrnVfy7J9ulx274Um7fn13a9KRAEFIIbZzgawNpaYKw2rlfSQlM701fCKN2g9ZW1PUPgDWOS66Y3iLqqlfdSLsntefbk101xOGD86f48u5PnTNydiVnh8-hS7nbhGMf5UyeU1gAVKJC_Vy9VXQ</recordid><startdate>20201202</startdate><enddate>20201202</enddate><creator>Arnold, O</creator><creator>Belounnas, A</creator><creator>Belyaev, A</creator><creator>Berger-Chen, J C</creator><creator>Blanco, A</creator><creator>M B"ohmer</creator><creator>Bordalo, P</creator><creator>Chernenko, S</creator><creator>Chlad, L</creator><creator>Ciepal, I</creator><creator>Deveaux, C</creator><creator>Dreyer, J</creator><creator>Epple, 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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>PHGZM</scope><scope>PHGZT</scope><scope>PIMPY</scope><scope>PKEHL</scope><scope>PQEST</scope><scope>PQGLB</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>GOX</scope></search><sort><creationdate>20201202</creationdate><title>Correlated pion-proton pair emission off hot and dense QCD matter</title><author>Arnold, O ; Belounnas, A ; Belyaev, A ; Berger-Chen, J C ; Blanco, A ; M B"ohmer ; Bordalo, P ; Chernenko, S ; Chlad, L ; Ciepal, I ; Deveaux, C ; Dreyer, J ; Epple, E ; Fabbietti, L ; Fateev, O ; Filip, P ; Fonte, P ; Franco, C ; Friese, J ; I Fr"ohlich ; Galatyuk, T ; Garzon, J A ; R Gernh"auser ; Golubeva, M ; Greifenhagen, R ; Guber, F ; Gumberidze, M ; Harabasz, S ; Heinz, T ; Hennino, T ; Hlavac, S ; C H"ohne ; Holzmann, R ; Ierusalimov, A ; Ivashkin, A ; B K"ampfer ; Karavicheva, T ; Kardan, B ; Koenig, I ; Koenig, W ; Kolb, B W ; Korcyl, G ; Kornakov, G ; Kornas, F ; Kotte, R ; Kugler, A ; Kunz, T ; Kurilkin, A ; Kurilkin, P ; Lalik, R ; Lopes, L ; Mahmoud, T ; Maier, L ; Malige, A ; Mangiarotti, A ; Markert, J ; Maurus, S ; Michel, J ; Morozov, S ; C M"untz ; Naumann, L ; Nowakowski, K ; Parpottas, Y ; Pechenov, V ; Petukhov, O ; Piasecki, K ; Pietraszko, J ; Pysz, K ; Ramstein, B ; Rathod, N ; Reshetin, A ; Rodriguez-Ramos, P ; Rost, A ; Sadovsky, A ; Salabura, P ; Scheib, T ; Scozzi, F ; Seck, F ; Selyuzhenkov, I ; Siebenson, J ; Silva, L ; Smyrski, J ; Sobolev, Yu G ; Spataro, S ; Spies, S ; H Str"obele ; Stroth, J ; Sturm, C ; Svoboda, O ; M Szala ; Tlusty, P ; Traxler, M ; Tsertos, H ; Usenko, E ; Wagner, V ; Wendisch, C ; Wirth, J ; Wojcik, D ; Zanevsky, Y ; Zumbruch, P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a525-21cec1ac5a8dd5008ceb43d598ecb72c469adf7ddb0a519003169bcaa6784ff33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Combinatorial analysis</topic><topic>Correlation analysis</topic><topic>Fireballs</topic><topic>Hadrons</topic><topic>Invariants</topic><topic>Kinetic energy</topic><topic>Physics - Nuclear Experiment</topic><topic>Pions</topic><topic>Protons</topic><topic>Transverse momentum</topic><toplevel>online_resources</toplevel><creatorcontrib>Arnold, O</creatorcontrib><creatorcontrib>Belounnas, A</creatorcontrib><creatorcontrib>Belyaev, A</creatorcontrib><creatorcontrib>Berger-Chen, J C</creatorcontrib><creatorcontrib>Blanco, A</creatorcontrib><creatorcontrib>M B"ohmer</creatorcontrib><creatorcontrib>Bordalo, P</creatorcontrib><creatorcontrib>Chernenko, S</creatorcontrib><creatorcontrib>Chlad, L</creatorcontrib><creatorcontrib>Ciepal, I</creatorcontrib><creatorcontrib>Deveaux, C</creatorcontrib><creatorcontrib>Dreyer, J</creatorcontrib><creatorcontrib>Epple, E</creatorcontrib><creatorcontrib>Fabbietti, L</creatorcontrib><creatorcontrib>Fateev, O</creatorcontrib><creatorcontrib>Filip, P</creatorcontrib><creatorcontrib>Fonte, P</creatorcontrib><creatorcontrib>Franco, C</creatorcontrib><creatorcontrib>Friese, J</creatorcontrib><creatorcontrib>I Fr"ohlich</creatorcontrib><creatorcontrib>Galatyuk, T</creatorcontrib><creatorcontrib>Garzon, J A</creatorcontrib><creatorcontrib>R Gernh"auser</creatorcontrib><creatorcontrib>Golubeva, M</creatorcontrib><creatorcontrib>Greifenhagen, R</creatorcontrib><creatorcontrib>Guber, F</creatorcontrib><creatorcontrib>Gumberidze, M</creatorcontrib><creatorcontrib>Harabasz, S</creatorcontrib><creatorcontrib>Heinz, T</creatorcontrib><creatorcontrib>Hennino, T</creatorcontrib><creatorcontrib>Hlavac, S</creatorcontrib><creatorcontrib>C H"ohne</creatorcontrib><creatorcontrib>Holzmann, R</creatorcontrib><creatorcontrib>Ierusalimov, A</creatorcontrib><creatorcontrib>Ivashkin, A</creatorcontrib><creatorcontrib>B K"ampfer</creatorcontrib><creatorcontrib>Karavicheva, T</creatorcontrib><creatorcontrib>Kardan, B</creatorcontrib><creatorcontrib>Koenig, I</creatorcontrib><creatorcontrib>Koenig, W</creatorcontrib><creatorcontrib>Kolb, B W</creatorcontrib><creatorcontrib>Korcyl, G</creatorcontrib><creatorcontrib>Kornakov, G</creatorcontrib><creatorcontrib>Kornas, F</creatorcontrib><creatorcontrib>Kotte, R</creatorcontrib><creatorcontrib>Kugler, A</creatorcontrib><creatorcontrib>Kunz, T</creatorcontrib><creatorcontrib>Kurilkin, A</creatorcontrib><creatorcontrib>Kurilkin, P</creatorcontrib><creatorcontrib>Lalik, R</creatorcontrib><creatorcontrib>Lopes, L</creatorcontrib><creatorcontrib>Mahmoud, T</creatorcontrib><creatorcontrib>Maier, L</creatorcontrib><creatorcontrib>Malige, A</creatorcontrib><creatorcontrib>Mangiarotti, A</creatorcontrib><creatorcontrib>Markert, J</creatorcontrib><creatorcontrib>Maurus, S</creatorcontrib><creatorcontrib>Michel, J</creatorcontrib><creatorcontrib>Morozov, S</creatorcontrib><creatorcontrib>C M"untz</creatorcontrib><creatorcontrib>Naumann, L</creatorcontrib><creatorcontrib>Nowakowski, K</creatorcontrib><creatorcontrib>Parpottas, Y</creatorcontrib><creatorcontrib>Pechenov, V</creatorcontrib><creatorcontrib>Petukhov, O</creatorcontrib><creatorcontrib>Piasecki, K</creatorcontrib><creatorcontrib>Pietraszko, J</creatorcontrib><creatorcontrib>Pysz, K</creatorcontrib><creatorcontrib>Ramstein, B</creatorcontrib><creatorcontrib>Rathod, N</creatorcontrib><creatorcontrib>Reshetin, A</creatorcontrib><creatorcontrib>Rodriguez-Ramos, P</creatorcontrib><creatorcontrib>Rost, A</creatorcontrib><creatorcontrib>Sadovsky, A</creatorcontrib><creatorcontrib>Salabura, P</creatorcontrib><creatorcontrib>Scheib, T</creatorcontrib><creatorcontrib>Scozzi, F</creatorcontrib><creatorcontrib>Seck, F</creatorcontrib><creatorcontrib>Selyuzhenkov, I</creatorcontrib><creatorcontrib>Siebenson, J</creatorcontrib><creatorcontrib>Silva, L</creatorcontrib><creatorcontrib>Smyrski, J</creatorcontrib><creatorcontrib>Sobolev, Yu G</creatorcontrib><creatorcontrib>Spataro, S</creatorcontrib><creatorcontrib>Spies, S</creatorcontrib><creatorcontrib>H Str"obele</creatorcontrib><creatorcontrib>Stroth, J</creatorcontrib><creatorcontrib>Sturm, C</creatorcontrib><creatorcontrib>Svoboda, O</creatorcontrib><creatorcontrib>M Szala</creatorcontrib><creatorcontrib>Tlusty, P</creatorcontrib><creatorcontrib>Traxler, M</creatorcontrib><creatorcontrib>Tsertos, H</creatorcontrib><creatorcontrib>Usenko, E</creatorcontrib><creatorcontrib>Wagner, V</creatorcontrib><creatorcontrib>Wendisch, C</creatorcontrib><creatorcontrib>Wirth, J</creatorcontrib><creatorcontrib>Wojcik, D</creatorcontrib><creatorcontrib>Zanevsky, Y</creatorcontrib><creatorcontrib>Zumbruch, P</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>ProQuest Central (New)</collection><collection>ProQuest One Academic (New)</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Middle East (New)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Applied & Life Sciences</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>Arnold, O</au><au>Belounnas, A</au><au>Belyaev, A</au><au>Berger-Chen, J C</au><au>Blanco, A</au><au>M B"ohmer</au><au>Bordalo, P</au><au>Chernenko, S</au><au>Chlad, L</au><au>Ciepal, I</au><au>Deveaux, C</au><au>Dreyer, J</au><au>Epple, E</au><au>Fabbietti, L</au><au>Fateev, O</au><au>Filip, P</au><au>Fonte, P</au><au>Franco, C</au><au>Friese, J</au><au>I Fr"ohlich</au><au>Galatyuk, T</au><au>Garzon, J A</au><au>R Gernh"auser</au><au>Golubeva, M</au><au>Greifenhagen, R</au><au>Guber, F</au><au>Gumberidze, M</au><au>Harabasz, S</au><au>Heinz, T</au><au>Hennino, T</au><au>Hlavac, S</au><au>C H"ohne</au><au>Holzmann, R</au><au>Ierusalimov, A</au><au>Ivashkin, A</au><au>B K"ampfer</au><au>Karavicheva, T</au><au>Kardan, B</au><au>Koenig, I</au><au>Koenig, W</au><au>Kolb, B W</au><au>Korcyl, G</au><au>Kornakov, G</au><au>Kornas, F</au><au>Kotte, R</au><au>Kugler, A</au><au>Kunz, T</au><au>Kurilkin, A</au><au>Kurilkin, P</au><au>Lalik, R</au><au>Lopes, L</au><au>Mahmoud, T</au><au>Maier, L</au><au>Malige, A</au><au>Mangiarotti, A</au><au>Markert, J</au><au>Maurus, S</au><au>Michel, J</au><au>Morozov, S</au><au>C M"untz</au><au>Naumann, L</au><au>Nowakowski, K</au><au>Parpottas, Y</au><au>Pechenov, V</au><au>Petukhov, O</au><au>Piasecki, K</au><au>Pietraszko, J</au><au>Pysz, K</au><au>Ramstein, B</au><au>Rathod, N</au><au>Reshetin, A</au><au>Rodriguez-Ramos, P</au><au>Rost, A</au><au>Sadovsky, A</au><au>Salabura, P</au><au>Scheib, T</au><au>Scozzi, F</au><au>Seck, F</au><au>Selyuzhenkov, I</au><au>Siebenson, J</au><au>Silva, L</au><au>Smyrski, J</au><au>Sobolev, Yu G</au><au>Spataro, S</au><au>Spies, S</au><au>H Str"obele</au><au>Stroth, J</au><au>Sturm, C</au><au>Svoboda, O</au><au>M Szala</au><au>Tlusty, P</au><au>Traxler, M</au><au>Tsertos, H</au><au>Usenko, E</au><au>Wagner, V</au><au>Wendisch, C</au><au>Wirth, J</au><au>Wojcik, D</au><au>Zanevsky, Y</au><au>Zumbruch, P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Correlated pion-proton pair emission off hot and dense QCD matter</atitle><jtitle>arXiv.org</jtitle><date>2020-12-02</date><risdate>2020</risdate><eissn>2331-8422</eissn><abstract>In this letter we report the first multi-differential measurement of correlated pion-proton pairs from 2 billion Au+Au collisions at \sqrt{s_{NN}} = 2.42 GeV collected with HADES. In this energy regime the population of \Delta(1232) resonances plays an important role in the way energy is distributed between intrinsic excitation energy and kinetic energy of the hadrons in the fireball. The triple differential d3N/dM{\pi}pdpTdy distributions of correlated {\pi}p pairs have been determined by subtracting the {\pi}p combinatorial background using an iterative method. The invariant-mass distributions in the \Delta(1232) mass region show strong deviations from a Breit-Wigner function with vacuum width and mass. The yield of correlated pion-proton pairs exhibits a complex isospin, rapidity and transverse-momentum dependence. In the invariant mass range 1.1 < Minv (GeV/c2) < 1.4, the yield is found to be similar for {\pi}+p and {\pi}-p pairs, and to follow a power law ^{\alpha}, where is the mean number of participating nucleons. The exponent {\alpha} depends strongly on the pair transverse momentum (pT) while its pT-integrated and charge-averaged value is {\alpha} = 1.5 \pm 0.08stat \pm 0.2sys.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.2012.01351</doi><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
| identifier | EISSN: 2331-8422 |
| ispartof | arXiv.org, 2020-12 |
| issn | 2331-8422 |
| language | eng |
| recordid | cdi_arxiv_primary_2012_01351 |
| source | arXiv.org; Free E- Journals |
| subjects | Combinatorial analysis Correlation analysis Fireballs Hadrons Invariants Kinetic energy Physics - Nuclear Experiment Pions Protons Transverse momentum |
| title | Correlated pion-proton pair emission off hot and dense QCD matter |
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