<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">Δ</mml:mi></mml:math>Resonance Production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>58</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow><mml:mi>i</mml:mi><mml:mo>+</mml:mo><mml:mi>C</mml:mi><mml:mi>u</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">E</mml:mi><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>1.97</mml:mn><mml:mn/><mml:mi mathvariant="italic">A</mml:mi><mml:mi/><mml:mi>GeV</mml:mi></mml:math>
E. HjortPurdue UniversityS. AlbergoNational Institute for Nuclear PhysicsF. BieserLawrence Berkeley National LaboratoryF. P. BradyUniversity of California at DavisZ. CacciaNational Institute for Nuclear PhysicsD. CebraUniversity of California at DavisA. D. ChaconTexas A and. M UniversityJ. L. ChanceUniversity of California at DavisY. ChoiSungkyunkwan UniversityS. CostaNational Institute for Nuclear PhysicsJ. B. ElliottPurdue UniversityM. L. GilkesPurdue UniversityJ. A. HaugerPurdue UniversityA. S. HirschPurdue UniversityA. InsoliaNational Institute for Nuclear PhysicsM. JusticeKent State UnivD. KeaneKent State UnivJ. C. KintnerSaint Mary's College of CaliforniaM. A. LisaLawrence Berkeley National LaboratoryH. S. MatisLawrence Berkeley National LaboratoryM. A. McMahanLawrence Berkeley National LaboratoryC. McParlandLawrence Berkeley National LaboratoryD. OlsonLawrence Berkeley National LaboratoryM. D. PartlanLawrence Berkeley National LaboratoryN. PorilePurdue UniversityR. PotenzaNational Institute for Nuclear PhysicsG. RaiLawrence Berkeley National LaboratoryJohn RasmussenLawrence Berkeley National LaboratoryH. G. RitterLawrence Berkeley National LaboratoryJ. RomańskiNational Institute for Nuclear PhysicsJ. L. RomeroUniversity of California at DavisG. V. RussoNational Institute for Nuclear PhysicsR. P. ScharenbergPurdue UniversityA. ScottUniversity of Wisconsin –,Y. ShaoUniversity of California at Los Angeles**B. K. SrivastavaPurdue UniversityT. J. M. SymonsLawrence Berkeley National LaboratoryM. TincknellPurdue UniversityC. TuvéNational Institute for Nuclear PhysicsS. WangKent State UnivPenny WarrenPurdue UniversityH. H. WiemanLawrence Berkeley National LaboratoryT. WienoldLawrence Berkeley National LaboratoryK. WolfTexas A and. M University
1997lv
ABI
Abstract
Invariant mass analyses of $(p,{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}})$ pairs in ${}^{58}\mathrm{Ni}+\mathrm{Cu}$ collisions at $1.97A\mathrm{GeV}$ have been performed and show correlations resulting from the decays of the \ensuremath{\Delta} resonance, the \ensuremath{\Lambda} baryon, and possibly the ${N}^{*}(1440)$ resonance. A reduction in the \ensuremath{\Delta} mass is observed and the mass reduction increases with collision centrality. Events generated by the relativistic cascade model (ARC) also reveal a mass reduction. The mass reduction is related to the size of the reaction volume and the details of \ensuremath{\Delta} production mechanisms in heavy ion collisions.
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