Efficiency Correction to HOWL Generator of J/ψ→ Baryon Antibaryon Decays

PING Rong-Gang; LI Hai-Bo

Chinese Physics C> 2006, Vol. 30> Issue(9) : 819-823

Efficiency Correction to HOWL Generator of J/ψ→ Baryon Antibaryon Decays

PING Rong-Gang ^, ,
LI Hai-Bo

CCASTWorld Lab., Beijing 100080, ChinaInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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Abstract：
A kind of Monte-Carlo generator based on the transition amplitude information is developed to study the detection efficiency correction to the pure phase space(HOWL) generator. Monte-Carlo(MC) simulations for the J/ψ→pp, ΛΛ, pX decays are carried out, and the results show that angular distributions for the decayed particles can well be reproduced. Compared with the HOWL generator, we find that the generator based on amplitude information will make a large correction to the detection efficiency. Therefore we recommend that a generator with a full transition information be used to simulate the long sequential decays.

References

[1]

. PING Rong-Gang, DU Shu-Xian. Chin. Phys. Lett., 2005,22: 13092. BAI J Z, BAN Y, BIAN J G et al. Phys. Lett., 2004, B549:473. Commins E D, Buchsbaus P H. Weak Interactions of Lep-tons and Quarks. Cambridge: Cambridge University Press,19834. ZOU B S, Hussain F. Phys. Rev., 2003, C67: 0152045. Particle Data Group. Phys. Lett., 2004, B592: 8646. Ablikim M, BAI J Z, BAN Y et al. arXiv:hep-ex/05060207. Ablikim M, BAI J Z, BAN Y et al. Phys. Rev. Lett., 2004,93: 1120028. Ablikim M, BAI J Z, BAN Y et al. arXiv:physics/05030019. Cronin J M, Oversetii O E. Phys. Rev., 1963, 129: 179510. Tornquist N A. Phys. Lett., 1986, A117: 111. Tixier M H, Ajaltouni Z, Falvard A et al. Phys. Lett., 1988,B212: 523

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PING Rong-Gang and LI Hai-Bo. Efficiency Correction to HOWL Generator of J/ψ→ Baryon Antibaryon Decays[J]. Chinese Physics C, 2006, 30(9): 819-823.

PING Rong-Gang and LI Hai-Bo. Efficiency Correction to HOWL Generator of J/ψ→ Baryon Antibaryon Decays[J]. Chinese Physics C, 2006, 30(9): 819-823. shu

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Received: 2006-02-05
Revised: 2006-04-11

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沈阳化工大学材料科学与工程学院沈阳 110142

Efficiency Correction to HOWL Generator of J/ψ→ Baryon Antibaryon Decays

PING Rong-Gang ^,
LI Hai-Bo

Corresponding author: PING Rong-Gang,

CCASTWorld Lab., Beijing 100080, ChinaInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2006-02-05
Accepted Date: 2006-04-11
Available Online: 2006-09-05

Abstract: A kind of Monte-Carlo generator based on the transition amplitude information is developed to study the detection efficiency correction to the pure phase space(HOWL) generator. Monte-Carlo(MC) simulations for the J/ψ→pp, ΛΛ, pX decays are carried out, and the results show that angular distributions for the decayed particles can well be reproduced. Compared with the HOWL generator, we find that the generator based on amplitude information will make a large correction to the detection efficiency. Therefore we recommend that a generator with a full transition information be used to simulate the long sequential decays.