TRACKING PERFORMANCE OF THE HERA-B OUTER

The track-ˇnding efciency in the OTR PC chambers has been estimated from the real data by using external reference tracks provided by VDS, RICH, and ECAL reconstruction. A method of reducing the ghost fraction in the reference track sample has been developed. The experimental data taken during the 2000 run have been analyzed. A set of routines have been developed to provide a tool to estimate the track efciency of the OTR. The limitations of the considered method are discussed in the conclusion. � §· iµE ´ ³¥Eµ¤ µI¥´±¨ E·¥±µ¢µ° OEE¥±E¨¢´µ¸E¨ �'-± ³¥· ¢´¥I´¥£µ E·¥±ep (OTR) ¨§ ´ - ²¨§ ·¥ ²O´OI ¤ ´´OI ¸ ¨¸¶µ²O§µ¢ ´¨¥³ µ¶µ·´µ£µ E·¥± , ¶µ²EI¥´´µ£µ ¸ ¶µ³µÐOO ·¥±µ´¸E·E±I¨¨ ¢ ¢¥·I¨´´µ³ ¤¥E¥±Eµ·¥ (VDS), ¤¥E¥±Eµ·¥ I¥·¥´±µ¢¸±¨I ±µ²¥I (RICH) ¨ O²¥±E·µ³ £´¨E´µ³ ¤¥E¥±Eµ·¥ (ECAL). � ¸¸³µE·¥´ ´µ¢O° ³¥Eµ¤ ¶µ¤ ¢²¥´¨O ¤µ ²¨ ²µ|´OI E·¥±µ¢ ¢ ´ iµ·¥ ¢O¤¥²O¥³OI µ¶µ·´OI E·¥±µ¢. "²O ´ ²¨§ iO²¨ ¨¸¶µ²O§µ¢ ´O O±¸¶¥·¨³¥´E ²O´O¥ ¤ ´´O¥, ´ i· ´´O¥ ¢ ¸¥ ´¸¥ µi²EI¥- ´¨O E¸E ´µ¢±¨ ¢ 2000 £. ‚ § ±²OI¥´¨¥ µi¸E|¤ OE¸O µ£· ´¨I¥´¨O ´ ¶·¨³¥´¨³µ¸EO · c¸³µE·¥´´µ£µ ³¥Eµ¤ .