<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">J</mml:mi><mml:mi>/</mml:mi><mml:mi mathvariant="italic">ψ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">ψ</mml:mi><mml:mo>(</mml:mo><mml:mn>2</mml:mn><mml:mi mathvariant="italic">S</mml:mi><mml:mo>)</mml:mo></mml:math>Production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">p</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi mathvariant="italic">p</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>√</mml:mi><mml:mi mathvariant="italic">s</mml:mi><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>1.8</mml:mn><mml:mn/><mml:mi/><mml:mi>TeV</mml:mi></mml:math>
F. AbeNational Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 315 JapanH. AkimotoUniversity of Tsukuba, Tsukuba, Ibaraki 315, JapanA. AkopianRockefeller University, New York, New York 10021M. G. AlbrowFermi National Accelerator Laboratory, Batavia, Illinois 60510S. R. AmendoliaIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyDante AmideiUniversity of Michigan, Ann Arbor, Michigan 48109J. AntošAcademia Sinica, Taipei, Taiwan 11530, Republic of ChinaS. AotaUniversity of Tsukuba, Tsukuba, Ibaraki 315, JapanG. ApollinariRockefeller University, New York, New York 10021T. AsakawaUniversity of Tsukuba, Tsukuba, Ibaraki 315, JapanW. AshmanskasErnest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720M. AtaçFermi National Accelerator Laboratory, Batavia, Illinois 60510F. AzfarUniversity of Pennsylvania, Philadelphia, Pennsylvania 19104P. AzziUniversita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-36132 Padova, ItalyN. BacchettaUniversita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-36132 Padova, ItalyW. BadgettUniversity of Michigan, Ann Arbor, Michigan 48109S. BagdasarovRockefeller University, New York, New York 10021M. W. BaileyUniversity of New Mexico, Albuquerque, New Mexico 87132J. BaoYale University, New Haven, Connecticut 06511P. de BarbaroUniversity of Rochester, Rochester, New York 14628A. Barbaro-GaltieriErnest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720V. E. BarnesPurdue University, West Lafayette, Indiana 47907B. A. BarnettThe Johns Hopkins University, Baltimore, Maryland 21218M. BaroneLaboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, ItalyE. BarziLaboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, ItalyG. BauerMassachusetts Institute of Technology, Cambridge, Massachusetts 02139T. BaumannHarvard University, Cambridge, Massachusetts 02138F. BedeschiIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyS. BehrendsBrandeis University, Waltham, Massachusetts 02264S. BelforteIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyG. BellettiniIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyJ. BellingerUniversity of Wisconsin, Madison, Wisconsin 53806D. BenjaminTexas Tech University, Lubbock, Texas 79409J. BenllochMassachusetts Institute of Technology, Cambridge, Massachusetts 02139J. R. BensingerBrandeis University, Waltham, Massachusetts 02264D. BentonUniversity of Pennsylvania, Philadelphia, Pennsylvania 19104A. BeretvasFermi National Accelerator Laboratory, Batavia, Illinois 60510J. P. BergéFermi National Accelerator Laboratory, Batavia, Illinois 60510J. BerryhillUniversity of Chicago, Chicago, Illinois 60638S. BertolucciLaboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, ItalyB. BevenseeUniversity of Pennsylvania, Philadelphia, Pennsylvania 19104A. BhattiRockefeller University, New York, New York 10021K. BieryFermi National Accelerator Laboratory, Batavia, Illinois 60510M. BinkleyFermi National Accelerator Laboratory, Batavia, Illinois 60510D. BiselloUniversita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-36132 Padova, ItalyR. E. BlairArgonne National Laboratory, Argonne, Illinois 60439C. BlockerBrandeis University, Waltham, Massachusetts 02264A. BodekUniversity of Rochester, Rochester, New York 14628W. BokhariMassachusetts Institute of Technology, Cambridge, Massachusetts 02139V. BolognesiIstituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, ItalyG. BollaPurdue University, West Lafayette, Indiana 47907D. BortolettoPurdue University, West Lafayette, Indiana 47907J. BoudreauUniversity of Pittsburgh, Pittsburgh, Pennsylvania 15270L. BrecciaIstituto Nazionale di Fisica Nucleare, University of Bologna, I-40127 Bologna, ItalyC. BrombergMichigan State University, East Lansing, Michigan 48824N. BrunerUniversity of New Mexico, Albuquerque, New Mexico 87132E. Buckley‐GeerFermi National Accelerator Laboratory, Batavia, Illinois 60510H. S. BuddUniversity of Rochester, Rochester, New York 14628K. BurkettUniversity of Michigan, Ann Arbor, Michigan 48109G. BusettoUniversita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-36132 Padova, ItalyR. G. WagnerFermi National Accelerator Laboratory, Batavia, Illinois 60510K. L. ByrumArgonne National Laboratory, Argonne, Illinois 60439J. CammerataThe Johns Hopkins University, Baltimore, Maryland 21218C. CampagnariFermi National Accelerator Laboratory, Batavia, Illinois 60510M. CampbellUniversity of Michigan, Ann Arbor, Michigan 48109A. CanerIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyW. CarithersErnest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720D. CarlsmithUniversity of Wisconsin, Madison, Wisconsin 53806A. CastroUniversita di Padova, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-36132 Padova, ItalyD. CauzIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyY. CenUniversity of Rochester, Rochester, New York 14628F. CervelliIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyP. S. ChangAcademia Sinica, Taipei, Taiwan 11530, Republic of ChinaP. ChangAcademia Sinica, Taipei, Taiwan 11530, Republic of ChinaH. Y. ChaoAcademia Sinica, Taipei, Taiwan 11530, Republic of ChinaJ. D. ChapmanUniversity of Michigan, Ann Arbor, Michigan 48109M.-T. ChengAcademia Sinica, Taipei, Taiwan 11530, Republic of ChinaG. ChiarelliIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyT. ChikamatsuUniversity of Tsukuba, Tsukuba, Ibaraki 315, JapanC. N. ChiouAcademia Sinica, Taipei, Taiwan 11530, Republic of ChinaL. ChristofekUniversity of Illinois, Urbana, Illinois 61801S. CihangirFermi National Accelerator Laboratory, Batavia, Illinois 60510A. ClarkUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandM. CobalIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyE. CoccaIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyM. ContrerasUniversity of Chicago, Chicago, Illinois 60638J. ConwayRutgers University, Piscataway, New Jersey 08854J. CooperFermi National Accelerator Laboratory, Batavia, Illinois 60510M. CordelliLaboratori Nazionali di Frascati, Istituto Nazionale di Fisica Nucleare, I-00044 Frascati, ItalyC. CouyoumtzelisUniversity of Geneva, CH-1211 Geneva 4, SwitzerlandD. CraneArgonne National Laboratory, Argonne, Illinois 60439D. Cronin-HennessyDuke University, Durham, North Carolina 28708R. CulbertsonUniversity of Chicago, Chicago, Illinois 60638T. DanielsMassachusetts Institute of Technology, Cambridge, Massachusetts 02139F. DeJonghFermi National Accelerator Laboratory, Batavia, Illinois 60510S. DelchampsFermi National Accelerator Laboratory, Batavia, Illinois 60510S. Dell’AgnelloIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyM. Dell’OrsoIstituto Nazionale di Fisica Nucleare, University and Scuola Normale Superiore of Pisa, I-56100 Pisa, ItalyR. DeminaFermi National Accelerator Laboratory, Batavia, Illinois 60510L. DemortierRockefeller University, New York, New York 10021
1997lv
ABI
Abstract
We present a study of $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$ production in $p\overline{p}$ collisions, at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ with the CDF detector at Fermilab. The $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$ mesons are reconstructed using their ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decay modes. We have measured the inclusive production cross section for both mesons as a function of their transverse momentum in the central region, $|\ensuremath{\eta}|<0.6$. We also measure the fraction of these events originating from $b$ hadrons. We thus extract individual cross sections for $J/\ensuremath{\psi}$ and $\ensuremath{\psi}(2S)$ mesons from $b$-quark decays and prompt production. We find a large excess (approximately a factor of 50) of direct $\ensuremath{\psi}(2S)$ production compared with predictions from the color singlet model.
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Cited by 20 references