Study of the production of Λ_b~0 band ~0 hadrons in pp collisions and first measurement of the Λ_b~0→J/ψpK~- branching fraction
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摘要
The product of the A_b~0(B~0) differential production cross-section and the branching fraction of the decay A_b~0→J/ψpK~-(B~0→J/ψK~*(892)~0) is measured as a function of the beauty hadron transverse momentum,p_T,and rapidity,y.The kinematic region of the measurements is p_T <20 GeV/c and 2.0 The product of the A_b~0(B~0) differential production cross-section and the branching fraction of the decay A_b~0→J/ψpK~-(B~0→J/ψK~*(892)~0) is measured as a function of the beauty hadron transverse momentum,p_T,and rapidity,y.The kinematic region of the measurements is p_T <20 GeV/c and 2.0
引文
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Data files are courtesy of the COMPAS Group,IHEP,Protvino,Russia.
2 Y.Oh,C.M.Ko,S.H.Lee,and S.Yasui,Phys.Rev.C,79:044905(2009)
3 W.S.Lockman et al,Phys.Lett.B,85:443(1979)
4 P.Chauvat et al(R608 Collaboration),Phys.Lett.B,199:304(1987)
5 S.Chatrchyan et al(CMS Collaboration),Phys.Lett.B,714:136(2012)
6 J.L.Rosner,Phys.Rev.D,90:014023(2014)
7 R.Aaij et al(LHCb Collaboration),Phys.Rev.D,85:032008(2012)
8 R.Aaij et al(LHCb Collaboration),JHEP,08:143(2014)
9 R.Aaij et al(LHCb Collaboration),Phys.Rev.Lett.,111:102003(2013)
10 R.Aaij et al(LHCb Collaboration),Phys.Rev.Lett.,115:072001(2015)
11 R.Aaij et al(LHCb Collaboration),JHEP,07:103(2014)
12 K.Abe et al(Belle Collaboration),Phys.Lett.B,538:11(2002)
13 A.A.Alves Jr.et al(LHCb Collaboration),JINST,3:S08005(2008)
14 R.Aaij et al(LHCb Collaboration),Int.J.Mod.Phys.A,30:1530022(2015)
15 R.Aaij et al,JINST,9:P09007(2014)
16 R.Arink et al,JINST,9:P01002(2014)
17 M.Adinolfi et al,Eur.Phys.J.C,73:2431(2013)
18 A.A.Alves Jr.et al,JINST,8:P02022(2013)
19 R.Aaij et al,JINST,8:P04022(2013)
20 K.A.Olive et al(Particle Data Group),Chin.Phys.C,38:090001(2014)
21 T.Sjostrand,S.Mrenna,and P.Skands,JHEP,05:026(2006)
22 T.Sjostrand,S.Mrenna,and P.Skands,Comput.Phys.Commun.,178:852(2008)
23 I.Belyaev et al,J.Phys.Conf.Ser.,331:032047(2011)
24 D.J.Lange,Nucl.Instrum.Methods A,462:152(2001)
25 P.Golonka and Z.Was,Eur.Phys.J.C,45:97(2006)
26 J.Allison et al(Geant4 Collaboration),IEEE Trans.Nucl.Sci.,53:270(2006)
27 S.Agostinelli et al(Geant4 Collaboration),Nucl.Instrum.Methods A,506:250(2003)
28 M.Clemencic et al,J.Phys.Conf.Ser.,331:032023(2011)
29 L.Breiman,J.H.Friedman,R.A.Olshen,and C.J.Stone,Classification and regression trees(Belmont,California,USA:Wadsworth international group,1984)
30 B.P.Roe et al,Nucl.Instrum.Methods A,543:577(2005)
31 R.E.Schapire and Y.Freund,Jour.Comp.and Syst.Sc.,55:119(1997)
32 A.Hoecker et al,Po S,ACAT:040(2007)
33 R.Fruhwirth,Nucl.Instrum.Methods A,262:444(1987)
34 M.Needham and J.Van Tilburg,LHCb-2007-020
35 M.Needham,LHCb-2007-129
36 R.Aaij et al(LHCb Collaboration),JINST,9:P12005(2014)
37 W.D.Hulsbergen,Nucl.Instrum.Methods A,552:566(2005)
38 R.Aaij et al(LHCb Collaboration),JHEP,08:117(2013)
39 R.Aaij et al(LHCb Collaboration),Phys.Rev.D,88:052002(2013)
40 M.Pivk and F.R.Le Diberder,Nucl.Instrum.Methods A,555:356(2005)
41 R.Aaij et al(LHCb Collaboration),JHEP,07:041(2014)
42 D.Mart′?nez Santos and F.Dupertuis,Nucl.Instrum.Methods A,764:150(2014)
43 R.Aaij et al(LHCb Collaboration),JINST,10:P02007(2015)
44 C.Tsallis,J.Statist.Phys.,52:479(1988)
45 C.Tsallis,Braz.J.Phys.,29:1(1999)
46 A.A.Bylinkin and O.I.Piskounova,ar Xiv:1501.07706
47 G.D.Lafferty and T.R.Wyatt,Nucl.Instrum.Methods A,355:541(1995)
48 M.Cacciari,M.Greco,and P.Nason,JHEP,05:007(1998)
49 M.Cacciari,S.Frixione,and P.Nason,JHEP,03:006(2001)
50 M.Cacciari et al,JHEP,10:137(2012)
51 J.L.Rosner,Phys.Rev.D,86:014011(2012)
Data files are courtesy of the COMPAS Group,IHEP,Protvino,Russia.