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PublishBlanche McDonald Modified over 9 years ago
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LHCb-light Meeting –June, 18th 2002 Frédéric MACHEFERT 1 Laboratoire de l’Accélérateur Linéaire (IN2P3-CNRS) Orsay, France Effect of M1-thickness LHCb-light meeting Tuesday, June 18th 2002
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LHCb-light Meeting –June, 18th 2002 Frédéric MACHEFERT 2 Laboratoire de l’Accélérateur Linéaire (IN2P3-CNRS) Orsay, France 14.4 % X 0 MC Sample Figures based on 17000 B 0 0 LHCb-light as of v241 Brunel v9r1 0 MC considered: p t ( 0 )>500MeV and no merged case selection : p t ( )>200MeV E PRS > 4 MeV E SPD veto 0 Rec : p t ( 0 )>500MeV 0 0 e + e - (z conversion > 8m) # 0 30944 (42.3%)36365 (45.5%) Not seen14.4%76.7%51.9% Seen85.623.3%48.1% Efficiency17.6%17.2%17.9% Purity14.2%2.8% (P( e + e - )~35 %) e + e - : p t (e + e - )>200MeV E PRS > 10 MeV E SPD Out of the sweeping region: 0 : =21.1% =19.4% 0 e + e -: =20.1% =5.8%
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LHCb-light Meeting –June, 18th 2002 Frédéric MACHEFERT 3 Laboratoire de l’Accélérateur Linéaire (IN2P3-CNRS) Orsay, France Signal - Noise 49.5% 30% 42.3% 45.5% 65% 55% 0 0 e + e - Efficiency Evolution with respect to X 0
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LHCb-light Meeting –June, 18th 2002 Frédéric MACHEFERT 4 Laboratoire de l’Accélérateur Linéaire (IN2P3-CNRS) Orsay, France X0 variations
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