<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>ρ</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>Production and Possible Modification in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">A</mml:mi><mml:mi mathvariant="normal">u</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">A</mml:mi><mml:mi mathvariant="normal">u</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">G</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">V</mml:mi></mml:math>
J. R. AdamsUniversity of Birmingham, Birmingham, United KingdomC. AdlerUniversity of Frankfurt, Frankfurt, GermanyM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaJ. AmonettKent State University, Kent, Ohio 44242, USAB. D. AndersonKent State University, Kent, Ohio 44242, USAD. ArkhipkinG. S. AverichevS.K. BadyalUniversity of Jammu, Jammu 180001, IndiaJ. BalewskiIndiana University, Bloomington, Indiana 47408, USAO. BarannikovaLaboratory for High Energy (JINR), Dubna, RussiaL. S. BarnbyUniversity of Birmingham, Birmingham, United KingdomJ. BaudotS. BekeleThe Ohio State University, Columbus, Ohio 43210, USAV. V. BelagaR. BellwiedWayne State University, Detroit, Michigan 48201, USAJ. BergerUniversity of Frankfurt, Frankfurt, GermanyB. I. BezverkhnyYale University, New Haven, Connecticut 06520, USAS. BhardwajUniversity of Rajasthan, Jaipur 302004, IndiaA. K. BhatiPanjab University, Chandigarh 160014, IndiaH. BichselUniversity of Washington, Seattle, Washington 98195, USAA. BillmeierWayne State University, Detroit, Michigan 48201, USAL. C. BlandBrookhaven National Laboratory, Upton, New York 11973, USAC. O. BlythUniversity of Birmingham, Birmingham, United KingdomB. E. BonnerRice University, Houston, Texas 77251, USAM. BotjeNIKHEF, Amsterdam, The NetherlandsA. BouchamSUBATECH, Nantes, FranceA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaA. BravarBrookhaven National Laboratory, Upton, New York 11973, USAR. V. CadmanArgonne National Laboratory, Argonne, Illinois 60439, USAX. Z. CaiShanghai Institute of Nuclear Research, Shanghai 201800, People’s Republic of ChinaM. Calderon De La Barca SanchezBrookhaven National Laboratory, Upton, New York 11973, USAJ. T. CarrollLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. Castillo CastellanosLawrence Berkeley National Laboratory, Berkeley, California 94720, USAD. CebraUniversity of California, Davis, California 95616, USAP. ChaloupkaNuclear Physics Institute AS CR, Řež/Prague, Czech RepublicS. ChattopadhyayVariable Energy Cyclotron Centre, Kolkata 700064, IndiaH. F. ChenUniversity of Science & Technology of China, Anhui 230027, ChinaY. ChenUniversity of California, Los Angeles, California 90095, USAS. ChernenkoM. CherneyCreighton University, Omaha, Nebraska 68178, USAA. ChikanianYale University, New Haven, Connecticut 06520, USAW. ChristieBrookhaven National Laboratory, Upton, New York 11973, USAJ. P. CoffinT. M. CormierWayne State University, Detroit, Michigan 48201, USAJ. G. CramerUniversity of Washington, Seattle, Washington 98195, USAH. J. CrawfordUniversity of California, Berkeley, California 94720, USAD. DasVariable Energy Cyclotron Centre, Kolkata 700064, IndiaS. DasVariable Energy Cyclotron Centre, Kolkata 700064, IndiaA. A. DerevschikovInstitute of High Energy Physics, Protvino, RussiaL. DidenkoBrookhaven National Laboratory, Upton, New York 11973, USAT. DietelUniversity of Frankfurt, Frankfurt, GermanyX. DongUniversity of California, Los Angeles, California 90095, USAJ. E. DraperUniversity of California, Davis, California 95616, USAF. DuYale University, New Haven, Connecticut 06520, USAA. K. DubeyInstitute of Physics, Bhubaneswar 751005, IndiaV. B. DuninJ. C. DunlopBrookhaven National Laboratory, Upton, New York 11973, USAM. R. Dutta MajumdarVariable Energy Cyclotron Centre, Kolkata 700064, IndiaV. EckardtMax-Planck-Institut für Physik, Munich, GermanyL. G. EfimovВ. ЕмеляновMoscow Engineering Physics Institute, Moscow, RussiaJ. EngelageUniversity of California, Berkeley, California 94720, USAG. EppleyRice University, Houston, Texas 77251, USAB. ErazmusSUBATECH, Nantes, FranceM. EstienneSUBATECH, Nantes, FranceP. FachiniBrookhaven National Laboratory, Upton, New York 11973, USAV. FaineBrookhaven National Laboratory, Upton, New York 11973, USAJ. FaivreR. FatemiIndiana University, Bloomington, Indiana 47408, USAK. FilimonovLawrence Berkeley National Laboratory, Berkeley, California 94720, USAP. FilipNuclear Physics Institute AS CR, Řež/Prague, Czech RepublicE. FinchYale University, New Haven, Connecticut 06520, USAY. FisyakBrookhaven National Laboratory, Upton, New York 11973, USAD. FlierlUniversity of Frankfurt, Frankfurt, GermanyK. J. FoleyBrookhaven National Laboratory, Upton, New York 11973, USAJ. FuInstitute of Particle Physics, CCNU (HZNU), Wuhan, 430079 ChinaC. A. GagliardiTexas A&M University, College Station, Texas 77843, USAN. GagunashviliJ. GansYale University, New Haven, Connecticut 06520, USAM. S. GantiVariable Energy Cyclotron Centre, Kolkata 700064, IndiaL. GaudichetSUBATECH, Nantes, FranceF. J. M. GeurtsRice University, Houston, Texas 77251, USAV. GhazikhanianUniversity of California, Los Angeles, California 90095, USAP. GhoshVariable Energy Cyclotron Centre, Kolkata 700064, IndiaJ. E. GonzalezUniversity of California, Los Angeles, California 90095, USAO. GrachovWayne State University, Detroit, Michigan 48201, USAO. G. GrebenyukNIKHEF, Amsterdam, The NetherlandsS. GronstalCreighton University, Omaha, Nebraska 68178, USAD. GrosnickValparaiso University, Valparaiso, Indiana 46383, USAS. M. GuertinUniversity of California, Los Angeles, California 90095, USAA. GuptaUniversity of Jammu, Jammu 180001, IndiaT. D. GutierrezUniversity of California, Davis, California 95616, USAT. J. HallmanBrookhaven National Laboratory, Upton, New York 11973, USAA. HamedWayne State University, Detroit, Michigan 48201, USAD. HardtkeLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. W. HarrisYale University, New Haven, Connecticut 06520, USAM. HeinzYale University, New Haven, Connecticut 06520, USA
2004lv
ABI
Аннотация
We report results on $\ensuremath{\rho}(770{)}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ production at midrapidity in $p+p$ and peripheral $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$. This is the first direct measurement of $\ensuremath{\rho}(770{)}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ in heavy-ion collisions. The measured ${\ensuremath{\rho}}^{0}$ peak in the invariant mass distribution is shifted by $\ensuremath{\sim}40\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{c}^{2}$ in minimum bias $p+p$ interactions and $\ensuremath{\sim}70\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}/{c}^{2}$ in peripheral $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions. The ${\ensuremath{\rho}}^{0}$ mass shift is dependent on transverse momentum and multiplicity. The modification of the ${\ensuremath{\rho}}^{0}$ meson mass, width, and shape due to phase space and dynamical effects are discussed.
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