Lei Xia Xiaorong Zhou Guangshun Huang Zhengguo Zhao

Lei Xia, Xiaorong Zhou, Guangshun Huang, Zhengguo Zhao University of Science and Technology of China The BESIII Tau and QCD Group Meeting Jan 21 th 2016 University of Science and Technology of China

Outline • Jan 21 st 2016 Study of Proton Track Efficiency 2

Introduction Jan 21 st 2016 Study of Proton Track Efficiency 3

Motivation • Jan 21 st 2016 Study of Proton Track Efficiency 4

Track Efficiency Method • Jan 21 st 2016 Study of Proton Track Efficiency 5

Tracking systematic uncertainty • Jan 21 st 2016 Study of Proton Track Efficiency 6

Tracking systematic uncertainty • Jan 21 st 2016 Study of Proton Track Efficiency 7

Ø Boss version & Data sets Ø Preliminary Selection Criteria Jan 21 st 2016 Study of Proton Track Efficiency 8

Boss version & Data sets ü Boss version: Boss 6. 6. 5. p 01 ü Data sets: R-scan data at 2. 396 Ge. V, 2. 6444 Ge. V, 2. 6464 Ge. V, 2. 9 Ge. V and 3. 080 Ge. V. TABLE I. Data set ü 0. 5 m MC sample at each c. m. energy, generated with Conexc. ü 1. 5 m qqbar MC at each c. m. energy, generated with Conexc. Jan 21 st 2016 Study of Proton Track Efficiency 9

Boss version & Data sets FIGURE I. Data set Jan 21 st 2016 Study of Proton Track Efficiency 10

Preliminary Selection Criteria • Jan 21 st 2016 Study of Proton Track Efficiency 11

Preliminary Selection Criteria • Jan 21 st 2016 Study of Proton Track Efficiency 12

Preliminary Selection Criteria • Jan 21 st 2016 Study of Proton Track Efficiency 13

Preliminary Selection Criteria • Jan 21 st 2016 Study of Proton Track Efficiency 14

Track efficiency result Ø Ø Fitting of proton Fitting of anti-proton Efficiency of Tracking Comparation Jan 21 st 2016 Study of Proton Track Efficiency 15

Fitting of proton • Jan 21 st 2016 Study of Proton Track Efficiency 16

Fitting of proton • Jan 21 st 2016 Study of Proton Track Efficiency 17

Fitting of proton • Jan 21 st 2016 Study of Proton Track Efficiency 18

Fitting of proton • Jan 21 st 2016 Study of Proton Track Efficiency 19

Tracking Efficiency with p TABLE II. Tracking Efficiency with p (Data) Jan 21 st 2016 Study of Proton Track Efficiency 20

Tracking Efficiency with p TABLE III. Tracking Efficiency with p (MC) Jan 21 st 2016 Study of Proton Track Efficiency 21

Tracking Efficiency with p FIGURE IV. Tracking Efficiency with p Jan 21 st 2016 Study of Proton Track Efficiency 22

Fitting of anti-proton • Jan 21 st 2016 Study of Proton Track Efficiency 23

Fitting of anti-proton • Jan 21 st 2016 Study of Proton Track Efficiency 24

Fitting of anti-proton • Jan 21 st 2016 Study of Proton Track Efficiency 25

Fitting of anti-proton • Jan 21 st 2016 Study of Proton Track Efficiency 26

Fitting of anti-proton • Jan 21 st 2016 Study of Proton Track Efficiency 27

• Jan 21 st 2016 Study of Proton Track Efficiency 28

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Jan 21 st 2016 Study of Proton Track Efficiency 30

Tracking Efficiency FIGURE VIII. Tracking Efficiency Jan 21 st 2016 Study of Proton Track Efficiency 31

Comparation FIGURE IX. Comparation with W. L. Yuan, et al. , ar. Xiv: 1507. 03453 v 2 Jan 21 st 2016 Study of Proton Track Efficiency 32

Comparation Jan 21 st 2016 Study of Proton Track Efficiency 33

PID efficiency Study Ø Preliminary Selection Criteria Ø Preliminary result of PID Jan 21 st 2016 Study of Proton Track Efficiency 34

Preliminary Selection Criteria • Jan 21 st 2016 Study of Proton Track Efficiency 35

Preliminary Selection Criteria • Jan 21 st 2016 Study of Proton Track Efficiency 36

Preliminary Selection Criteria • Jan 21 st 2016 Study of Proton Track Efficiency 37

Preliminary Selection Criteria • Jan 21 st 2016 Study of Proton Track Efficiency 38

Preliminary result of PID Efficiency FIGURE XI. PID Efficiency Jan 21 rd 21 st 2016 Study of Proton Track Efficiency 3933

Summary Jan 21 st 2016 Study of Proton Track Efficiency 40

Summary • Jan 21 st 2016 Study of Proton Track Efficiency 41

Preliminary results ü Preliminary results • Jan 21 st 2016 Study of Proton Track Efficiency 42

December 14 th 2015 Measurement of e+e-→ppbar Cross Section 43

Thanks for Your Attention! Jan 21 st 2016 Study of Proton Track Efficiency 44