Event-wise<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>〈</mml:mo><mml:msub><mml:mi>p</mml:mi><mml:mrow><mml:mi>t</mml:mi></mml:mrow></mml:msub><mml:mo>〉</mml:mo></mml:mrow></mml:math>fluctuations in Au-Au collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi mathvariant="italic">NN</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>130</mml:mn></mml:mrow></mml:math>GeV
J. R. AdamsUniversity of Birmingham, Birmingham, United KingdomC. AdlerUniversity of Frankfurt, Frankfurt, GermanyM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedPurdue University, West Lafayette, Indiana 47907, USAJ. AmonettKent State University, Kent, Ohio 44242, USAB. D. AndersonKent State University, Kent, Ohio 44242, USAMark AndersonUniversity of California, Davis, California 95616, USAD ArkhipkinParticle Physics Laboratory (JINR), Dubna, RussiaG. S. AverichevS.K. BadyalUniversity of Jammu, Jammu 180001, IndiaJ. T. BalewskiIndiana University, Bloomington, Indiana 47408, USAO. BarannikovaLaboratory for High Energy (JINR), Dubna, RussiaL. S. BarnbyKent State University, Kent, Ohio 44242, USAJ. BaudotInstitut de Recherches Subatomiques, Strasbourg, FranceS. BekeleOhio 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, IndiaP. BhaskarVariable Energy Cyclotron Centre, Kolkata 700064, 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, ChinaH. CainesYale University, New Haven, Connecticut 06520, USAM. Calderón de la Barca SánchezBrookhaven National Laboratory, Upton, New York 11973, USAJ. CarrollLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. Castillo CastellanosLawrence Berkeley National Laboratory, Berkeley, California 94720, USAM. CastroWayne State University, Detroit, Michigan 48201, USAD. CebraUniversity of California, Davis, California 95616, USAP. ChaloupkaNuclear Physics Institute AS CR, e/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, USAB. ChoiUniversity of Texas, Austin, Texas 78712, 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. DongLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. E. DraperUniversity of California, Davis, California 95616, USAF. DuYale University, New Haven, Connecticut 06520, USAA. K. DubeyInsitute 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 fr 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. FaineJoint Institute for Nuclear ResearchJ. FaivreInstitut de Recherches Subatomiques, Strasbourg, FranceR. FatemiIndiana University, Bloomington, Indiana 47408, USAK. FilimonovLawrence Berkeley National Laboratory, Berkeley, California 94720, USAP. FilipNuclear Physics Institute AS CR, e/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, College Station, Texas 77843, USAM. S. GantiVariable Energy Cyclotron Centre, Kolkata 700064, IndiaT. D. GutierrezUniversity of California, Davis, California 95616, USAN. GagunashviliLaboratory for High Energy (JINR), Dubna, RussiaJ. GansYale University, New Haven, Connecticut 06520, USAL. GaudichetSUBATECH, Nantes, FranceM. GermainInstitut de Recherches Subatomiques, Strasbourg, 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, USAV. GrigorievMoscow Engineering Physics Institute, Moscow, RussiaS. GronstalCreighton University, Omaha, Nebraska 68178, USAD. GrosnickValparaiso University, Valparaiso, Indiana 46383, USAM. GuedonInstitut de Recherches Subatomiques, Strasbourg, FranceS. M. GuertinUniversity of California, Los Angeles, California 90095, USAA. GuptaUniversity of Jammu, Jammu 180001, India
ABI
Аннотация
We present the first large-acceptance measurement of event-wise mean transverse momentum $\ensuremath{\langle}{p}_{t}\ensuremath{\rangle}$ fluctuations for Au-Au collisions at nucleon-nucleon center-of-momentum collision energy $\sqrt{{s}_{\mathit{NN}}}$ = 130 GeV. The observed nonstatistical $\ensuremath{\langle}{p}_{t}\ensuremath{\rangle}$ fluctuations substantially exceed in magnitude fluctuations expected from the finite number of particles produced in a typical collision. The r.m.s. fractional width excess of the event-wise $\ensuremath{\langle}{p}_{t}\ensuremath{\rangle}$ distribution is $13.7\ifmmode\pm\else\textpm\fi{}0.1$(stat) $\ifmmode\pm\else\textpm\fi{}1.3$(syst)% relative to a statistical reference, for the 15% most-central collisions and for charged hadrons within pseudorapidity range $|\ensuremath{\eta}|<1,2\ensuremath{\pi}$ azimuth, and $0.15\ensuremath{\le}{p}_{t}\phantom{\rule{0.3em}{0ex}}\ensuremath{\le}\phantom{\rule{0.3em}{0ex}}2$ GeV/c. The width excess varies smoothly but nonmonotonically with collision centrality and does not display rapid changes with centrality which might indicate the presence of critical fluctuations. The reported $\ensuremath{\langle}{p}_{t}\ensuremath{\rangle}$ fluctuation excess is qualitatively larger than those observed at lower energies and differs markedly from theoretical expectations. Contributions to $\ensuremath{\langle}{p}_{t}\ensuremath{\rangle}$ fluctuations from semihard parton scattering in the initial state and dissipation in the bulk colored medium are discussed.
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