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Measurements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mo mathvariant="bold">*</mml:mo></mml:msup></mml:math>production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo mathvariant="bold">+</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:mi>s</mml:mi></mml:msqrt><mml:mo mathvariant="bold">=</mml:mo><mml:mn>200</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi></mml:math>

L. AdamczykAGH University of Science and Technology, Cracow, PolandG. AgakishievJoint Institute for Nuclear Research, Dubna, 141 980, RussiaM. M. AggarwalPanjab University, Chandigarh 160014, IndiaZ. AhammedVariable Energy Cyclotron Centre, Kolkata 700064, IndiaA. V. AlakhverdyantsJoint Institute for Nuclear Research, Dubna, 141 980, RussiaI. AlekseevAlikhanov Institute for Theoretical and Experimental Physics, Moscow, RussiaJ. AlfordKent State University, Kent, Ohio 44242, USAB. D. AndersonKent State University, Kent, Ohio 44242, USAC. AnsonOhio State University, Columbus, Ohio 43210, USAD. ArkhipkinBrookhaven National Laboratory, Upton, New York 11973, USAE. C. AschenauerBrookhaven National Laboratory, Upton, New York 11973, USAG. S. AverichevJoint Institute for Nuclear Research, Dubna, 141 980, RussiaJ. BalewskiMassachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAA. BanerjeeVariable Energy Cyclotron Centre, Kolkata 700064, IndiaZ. BarnovskaNuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech RepublicD. R. BeavisBrookhaven National Laboratory, Upton, New York 11973, USAR. BellwiedUniversity of Houston, Houston, Texas, 77204, USAM. BetancourtMassachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAR. R. BettsUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAA. BhasinUniversity of Jammu, Jammu 180001, IndiaA. K. BhatiPanjab University, Chandigarh 160014, IndiaH. BichselUniversity of Washington, Seattle, Washington 98195, USAJ. BielčíkCzech Technical University in Prague, FNSPE, Prague, 115 19, Czech RepublicJ. BielčíkováNuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech RepublicL. C. BlandBrookhaven National Laboratory, Upton, New York 11973, USAI. G. BordyuzhinAlikhanov Institute for Theoretical and Experimental Physics, Moscow, RussiaW. BorowskiSUBATECH, Nantes, FranceJ. BouchetKent State University, Kent, Ohio 44242, USAA. V. BrandinMoscow Engineering Physics Institute, Moscow, RussiaS. G. BrovkoUniversity of California, Davis, California 95616, USAE. BrunaYale University, New Haven, Connecticut 06520, USAS. BueltmannOld Dominion University, Norfolk, Virginia, 23529, USAI. BunzarovJoint Institute for Nuclear Research, Dubna, 141 980, RussiaT. P. BurtonBrookhaven National Laboratory, Upton, New York 11973, USAJ. M. ButterworthRice University, Houston, Texas 77251, USAX. Z. CaiShanghai Institute of Applied Physics, Shanghai 201800, ChinaH. CainesYale University, New Haven, Connecticut 06520, USAM. Calderón de la Barca SánchezUniversity of California, Davis, California 95616, USAD. CebraUniversity of California, Davis, California 95616, USAR. CendejasUniversity of California, Los Angeles, California 90095, USAM. C. CervantesTexas A&M University, College Station, Texas 77843, USAP. ChaloupkaNuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech RepublicS. ChattopadhyayVariable Energy Cyclotron Centre, Kolkata 700064, IndiaH. F. ChenUniversity of Science and Technology of China, Hefei 230026, ChinaC. H. ChengCentral China Normal University (HZNU), Wuhan 430079, ChinaJ. Y. ChenCentral China Normal University (HZNU), Wuhan 430079, ChinaL. ChenCentral China Normal University (HZNU), Wuhan 430079, ChinaJ. ChengTsinghua University, Beijing 100084, ChinaM. CherneyCreighton University, Omaha, Nebraska 68178, USAA. ChikanianYale University, New Haven, Connecticut 06520, USAW. ChristieBrookhaven National Laboratory, Upton, New York 11973, USAP. ChungNuclear Physics Institute AS CR, 250 68 Řež/Prague, Czech RepublicJ. J. ChwastowskiTexas A&M University, College Station, Texas 77843, USAM. J. M. CodringtonTexas A&M University, College Station, Texas 77843, USAR. CorlissMassachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USAJ. G. CramerUniversity of Washington, Seattle, Washington 98195, USAH. J. CrawfordUniversity of California, Berkeley, California 94720, USAX.Y. CuiUniversity of Science and Technology of China, Hefei 230026, ChinaA. Davila LeyvaUniversity of Texas, Austin, Texas 78712, USAL. C. De SilvaUniversity of Houston, Houston, Texas, 77204, USAR. R. DebbeBrookhaven National Laboratory, Upton, New York 11973, USAT. G. DedovichJoint Institute for Nuclear Research, Dubna, 141 980, RussiaJ. DengShandong University, Jinan, Shandong 250100, ChinaR. Derradi de SouzaUniversidade Estadual de Campinas, Sao Paulo, BrazilS. DhamijaIndiana University, Bloomington, Indiana 47408, USAL. DidenkoBrookhaven National Laboratory, Upton, New York 11973, USAF. DingUniversity of California, Davis, California 95616, USAA. DionBrookhaven National Laboratory, Upton, New York 11973, USAP. DjawothoTexas A&M University, College Station, Texas 77843, USAX. DongLawrence Berkeley National Laboratory, Berkeley, California 94720, USAJ. L. DrachenbergTexas A&M University, College Station, Texas 77843, USAJ. E. DraperUniversity of California, Davis, California 95616, USAC. M. DuInstitute of Modern Physics, Lanzhou, ChinaL. E. DunkelbergerUniversity of California, Los Angeles, California 90095, USAJ. C. DunlopBrookhaven National Laboratory, Upton, New York 11973, USAL. G. EfimovJoint Institute for Nuclear Research, Dubna, 141 980, RussiaM. ElnimrWayne State University, Detroit, Michigan 48201, USAJ. EngelageUniversity of California, Berkeley, California 94720, USAG. EppleyRice University, Houston, Texas 77251, USAL. EunLawrence Berkeley National Laboratory, Berkeley, California 94720, USAO. EvdokimovUniversity of Illinois at Chicago, Chicago, Illinois 60607, USAR. FatemiUniversity of Kentucky, Lexington, Kentucky, 40506-0055, USAS. FazioBrookhaven National Laboratory, Upton, New York 11973, USAJ. FedorišinJoint Institute for Nuclear Research, Dubna, 141 980, RussiaR. G. FerschUniversity of Kentucky, Lexington, Kentucky, 40506-0055, USAP. FilipJoint Institute for Nuclear Research, Dubna, 141 980, RussiaE. FinchYale University, New Haven, Connecticut 06520, USAY. FisyakBrookhaven National Laboratory, Upton, New York 11973, USAC. A. GagliardiTexas A&M University, College Station, Texas 77843, USAD. R. GangadharanOhio State University, Columbus, Ohio 43210, USAF. J. M. GeurtsRice University, Houston, Texas 77251, USAS. GliskeArgonne National Laboratory, Argonne, Illinois 60439, USAY. N. GorbunovCreighton University, Omaha, Nebraska 68178, USAO. G. GrebenyukLawrence Berkeley National Laboratory, Berkeley, California 94720, USAD. GrosnickValparaiso University, Valparaiso, Indiana 46383, USAS. K. GuptaUniversity of Jammu, Jammu 180001, IndiaW. GurynBrookhaven National Laboratory, Upton, New York 11973, USAB. HaagUniversity of California, Davis, California 95616, USAO. HajkovaCzech Technical University in Prague, FNSPE, Prague, 115 19, Czech RepublicA. HamedTexas A&M University, College Station, Texas 77843, USA

2012lv

ABI

Аннотация

We report measurements of charmed-hadron $({D}^{0},{D}^{*})$ production cross sections at midrapidity in $p+p$ collisions at a center-of-mass energy of 200 GeV by the STAR experiment. Charmed hadrons were reconstructed via the hadronic decays ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$, ${D}^{*+}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{+}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}$ and their charge conjugates, covering the ${p}_{T}$ range of $0.6--2.0$ and $2.0--6.0\text{ }\text{ }\mathrm{GeV}/c$ for ${D}^{0}$ and ${D}^{*+}$, respectively. From this analysis, the charm-pair production cross section at midrapidity is $d\ensuremath{\sigma}/dy{|}_{y=0}^{c\overline{c}}=170\ifmmode\pm\else\textpm\fi{}45(\mathrm{stat}{)}_{\ensuremath{-}59}^{+38}(\mathrm{sys})\text{ }\text{ }\ensuremath{\mu}\mathrm{b}$. The extracted charm-pair cross section is compared to perturbative QCD calculations. The transverse momentum differential cross section is found to be consistent with the upper bound of a fixed-order next-to-leading logarithm calculation.

Идентификаторлар

DOI: 10.1103/physrevd.86.072013

Иқтибослар ва манбалар

3 та иқтибос0 та фойдаланилган манба

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