Measurement of e~+e~-→D■ cross sections at the ψ(3770) resonance
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摘要
We report new measurements of the cross sections for the production of DD final states at theψ(3770)resonance.Our data sample consists of an integrated luminosity of 2.93 fb~(-1)of e~+e~-annihilation data produced by the BEPCⅡ collider and collected and analyzed with the BESⅢ detector.We exclusively reconstruct three D~0and six D~+hadronic decay modes and use the ratio of the yield of fully reconstructed DD events("double tags")to the yield of all reconstructed D or D mesons("single tags")to determine the number of D~0 D~0and D~+D~-events,benefiting from the cancellation of many systematic uncertainties.Combining these yields with an independent determination of the integrated luminosity of the data sample,we find the cross sections to beσ(e~+e~-→D~0D~0)=(3.615±0.010±0.038)nb andσ(e~+e~-→D~+D~-)=(2.830±0.011±0.026)nb,where the uncertainties are statistical and systematic,respectively.
We report new measurements of the cross sections for the production of DD final states at theψ(3770)resonance.Our data sample consists of an integrated luminosity of 2.93 fb~(-1)of e~+e~-annihilation data produced by the BEPCⅡ collider and collected and analyzed with the BESⅢ detector.We exclusively reconstruct three D~0and six D~+hadronic decay modes and use the ratio of the yield of fully reconstructed DD events("double tags")to the yield of all reconstructed D or D mesons("single tags")to determine the number of D~0 D~0and D~+D~-events,benefiting from the cancellation of many systematic uncertainties.Combining these yields with an independent determination of the integrated luminosity of the data sample,we find the cross sections to beσ(e~+e~-→D~0D~0)=(3.615±0.010±0.038)nb andσ(e~+e~-→D~+D~-)=(2.830±0.011±0.026)nb,where the uncertainties are statistical and systematic,respectively.
We report new measurements of the cross sections for the production of DD final states at theψ(3770)resonance.Our data sample consists of an integrated luminosity of 2.93 fb~(-1)of e~+e~-annihilation data produced by the BEPCⅡ collider and collected and analyzed with the BESⅢ detector.We exclusively reconstruct three D~0and six D~+hadronic decay modes and use the ratio of the yield of fully reconstructed DD events("double tags")to the yield of all reconstructed D or D mesons("single tags")to determine the number of D~0 D~0and D~+D~-events,benefiting from the cancellation of many systematic uncertainties.Combining these yields with an independent determination of the integrated luminosity of the data sample,we find the cross sections to beσ(e~+e~-→D~0D~0)=(3.615±0.010±0.038)nb andσ(e~+e~-→D~+D~-)=(2.830±0.011±0.026)nb,where the uncertainties are statistical and systematic,respectively.
引文
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19 Heavy Flavor Averaging Group(HFLAV),(http://www.slac.stanford.edu/xorg/hflav/charm/).
20 T.Evans et al,Phys.Lett.B,757:520(2016)
2 M.Ablikim et al(BES Collaboration),Phys.Lett.B,659:74(2008)
3 D.Besson et al(CLEO Collaboration),Phys.Rev.Lett.,96:092002(2006);Phys.Rev.Lett.,104:159901(2010)
4 G.Bonvicini et al(CLEO Collaboration),Phys.Rev.D,89:072002(2014);Phys.Rev.D,91:019903(2015)
5 R.M.Baltrusaitis et al(MARK-III Collaboration),Phys.Rev.Lett.,56:2140(1986)
6 D.M.Asner and W.M.Sun,Phys.Rev.D,73:034024(2006);Phys.Rev.D,77:019901(2008)
7 M.Ablikim et al(BESIII Collaboration),Chin.Phys.C,37:123001(2013)
8 M.Ablikim et al(BESIII Collaboration),Phys.Lett.B,753:629(2016);G.Balossini et al,Nucl.Phys.B,758:227(2006);S.Actis et al(Working Group on Radiative Corrections and Monte Carlo Generators for Low Energies),Eur.Phys.J.C,66:585(2010)
9 M.Ablikim et al(BESIII Collaboration),Nucl.Instrum.Meth.A,614:345(2010)
10 S.Agostinelli et al(GEANT4 Collaboration),Nucl.Instrum.Meth.A,506:250(2003)
11 S.Jadach,B.F.L.Ward,and Z.Was,Comput.Phys.Commun.,130:260(2000)
12 S.Jadach,B.F.L.Ward,and Z.Was,Phys.Rev.D,63:113009(2001)
13 D.J.Lange,Nucl.Instrum.Meth.A,462:152(2001);R.G.Ping,Chin.Phys.C 32,599(2008)
14 J.C.Chen,G.S.Huang,X.R.Qi,D.H.Zhang,and Y.S.Zhu,Phys.Rev.D,62:034003(2000)
15 S.Jadach,J.H.K¨uhn,and Z.Was,Comput.Phys.Commun.,64:275(1990);M.Jezabek,Z.Was,S.Jadach,and J.H.K¨uhn,Comput.Phys.Commun.,70:69(1992);S.Jadach,Z.Was,R.Decker,and J.H.K¨uhn,Comput.Phys.Commun.,76:361(1993);P.Golonka et al,Comput.Phys.Commun.,174:818(2006)
16 M.Ablikim et al(BESIII Collaboration),Phys.Lett.B,744:339(2015)
17 H.Albrecht et al(ARGUS Collaboration),Phys.Lett.B,241:278(1990)
18 D.M.Asner et al(CLEO Collaboration),Phys.Rev.D,86:112001(2012)
19 Heavy Flavor Averaging Group(HFLAV),(http://www.slac.stanford.edu/xorg/hflav/charm/).
20 T.Evans et al,Phys.Lett.B,757:520(2016)