Observation of Direct Photons in Central<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>158</mml:mn><mml:mi mathvariant="italic">A</mml:mi></mml:math>GeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>208</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>b</mml:mi><mml:mo>+</mml:mo><mml:mi>P</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>208</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow><mml:mi>b</mml:mi></mml:math>Collisions
M. M. AggarwalUniversity of Panjab, Chandigarh 160014, IndiaA. AgnihotriUniversity of Rajasthan, Jaipur 302004, Rajasthan, IndiaZ. AhammedVariable Energy Cyclotron Centre, Calcutta 700 064, IndiaA.L.S. AngelisUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandV. AntonenkoRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaV. ArefievJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaV. AstakhovJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaV. AvdeitchikovJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaT. C. AwesOak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6372P.V.K.S. BabaUniversity of Jammu, Jammu 180001, IndiaS.K. BadyalUniversity of Jammu, Jammu 180001, IndiaC. BarlagUniversity of Münster, D-48149 Münster, GermanyS. BatheUniversity of Münster, D-48149 Münster, GermanyB. BatiouniaJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaT. BernierSUBATECH, Ecole des Mines, Nantes, FranceK.B. BhallaUniversity of Rajasthan, Jaipur 302004, Rajasthan, IndiaV.S. BhatiaUniversity of Panjab, Chandigarh 160014, IndiaC. BlumeUniversity of Münster, D-48149 Münster, GermanyR. BockE.-M. BohneUniversity of Münster, D-48149 Münster, GermanyZ. BöröczUniversity of Münster, D-48149 Münster, GermanyD. BucherUniversity of Münster, D-48149 Münster, GermanyA. BuijsUniversiteit Utrecht/NIKHEF, NL-3508 TA Utrecht, The NetherlandsH. BüschingUniversity of Münster, D-48149 Münster, GermanyL. CarlénUniversity of Lund, SE-221 00 Lund, SwedenV. ChalyshevJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaS. ChattopadhyayVariable Energy Cyclotron Centre, Calcutta 700 064, IndiaR. CherbatchevRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaT. ChujoUniversity of Tsukuba, Ibaraki 305, JapanA. ClaussenUniversity of Münster, D-48149 Münster, GermanyAvijit DasVariable Energy Cyclotron Centre, Calcutta 700 064, IndiaM. P. DecowskiMIT, Cambridge, Massachusetts 02139H. DelagrangeSUBATECH, Ecole des Mines, Nantes, FranceV. DjordjadzeJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaP. DönniUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandI. DoubovikRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaS. DuttUniversity of Jammu, Jammu 180001, IndiaM. R. Dutta MajumdarVariable Energy Cyclotron Centre, Calcutta 700 064, IndiaK. El ChenawiUniversity of Lund, SE-221 00 Lund, SwedenS. EliseevNuclear Physics Institute, CZ-250 68 Rez, Czech RepublicK. EnosawaUniversity of Tsukuba, Ibaraki 305, JapanP. FokaUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandS. FokinRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaM. S. GantiVariable Energy Cyclotron Centre, Calcutta 700 064, IndiaS. GarpmanUniversity of Lund, SE-221 00 Lund, SwedenO. GavrishchukJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaF. J. M. GeurtsUniversiteit Utrecht/NIKHEF, NL-3508 TA Utrecht, The NetherlandsTushar K. GhoshKVI, University of Groningen, NL-9747 AA Groningen, The NetherlandsR. GlasowUniversity of Münster, D-48149 Münster, GermanyS. K. GuptaUniversity of Rajasthan, Jaipur 302004, Rajasthan, IndiaB.N. Gus'kovJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaH.-Å. GustafssonUniversity of Lund, SE-221 00 Lund, SwedenH.H. GutbrodSUBATECH, Ecole des Mines, Nantes, FranceR. HiguchiUniversity of Tsukuba, Ibaraki 305, JapanI. HřivnáčováNuclear Physics Institute, CZ-250 68 Rez, Czech RepublicM. IppolitovRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaH. KalechofskyUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandR. KamermansUniversiteit Utrecht/NIKHEF, NL-3508 TA Utrecht, The NetherlandsK.‐H. KampertUniversity of Münster, D-48149 Münster, GermanyK. KaradjevRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaK. KarpioS. KatoUniversity of Tsukuba, Ibaraki 305, JapanS. KeesUniversity of Münster, D-48149 Münster, GermanyC. Klein-BösingUniversity of Münster, D-48149 Münster, GermanySabine KnocheUniversity of Münster, D-48149 Münster, GermanyB. W. KolbI. KosarevJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaI. KoutcheryaevRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaT. KrümpelUniversity of Münster, D-48149 Münster, GermanyA. KuglerNuclear Physics Institute, CZ-250 68 Rez, Czech RepublicP. KulinichMIT, Cambridge, Massachusetts 02139Masanao KurataUniversity of Tsukuba, Ibaraki 305, JapanK. KuritaUniversity of Tsukuba, Ibaraki 305, JapanN. KuzminJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaI. LangbeinA. LebedevRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaY. Y. LeeH. LöhnerKVI, University of Groningen, NL-9747 AA Groningen, The NetherlandsL. LuquinSUBATECH, Ecole des Mines, Nantes, FranceD. P. MahapatraInstitute of Physics, 751-005 Bhubaneswar, IndiaV. MankoRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaMichel MartinUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandG. Martı́nezSUBATECH, Ecole des Mines, Nantes, FranceA. MaximovJoint Institute for Nuclear Research, RU-141980 Dubna, RussiaG. MgebrichviliRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaY. MiakeUniversity of Tsukuba, Ibaraki 305, JapanMd.F. MirUniversity of Jammu, Jammu 180001, IndiaG. C. MishraInstitute of Physics, 751-005 Bhubaneswar, IndiaYusuke MiyamotoUniversity of Tsukuba, Ibaraki 305, JapanB. MohantyInstitute of Physics, 751-005 Bhubaneswar, IndiaM.-J. MoraSUBATECH, Ecole des Mines, Nantes, FranceD. MorrisonUniversity of Tennessee, Knoxville, Tennessee 37966D.S. MukhopadhyayVariable Energy Cyclotron Centre, Calcutta 700 064, IndiaH. NaefUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandB. K. NandiInstitute of Physics, 751-005 Bhubaneswar, IndiaS.K. NayakSUBATECH, Ecole des Mines, Nantes, FranceT. K. NayakVariable Energy Cyclotron Centre, Calcutta 700 064, IndiaS. NeumaierA. NianineRRC “Kurchatov Institute,” RU-123182 Moscow, RussiaV. NikitineJoint Institute for Nuclear Research, RU-141980 Dubna, Russia
2000lv
ABI
Аннотация
A measurement of direct photon production in 208Pb+208Pb collisions at 158A GeV has been carried out in the CERN WA98 experiment. The invariant yield of direct photons in central collisions is extracted as a function of transverse momentum in the interval 0.5<p(T)<4 GeV/c. A significant direct photon signal, compared to statistical and systematical errors, is seen at p(T)>1.5 GeV/c. The result constitutes the first observation of direct photons in ultrarelativistic heavy-ion collisions. It could be significant for diagnosis of quark-gluon-plasma formation.
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