Chinese Physics C > 1980, Vol. 4 > Issue(4): 531-535

COSMIC RAY'S DATA OF MEAN LIVES OF D MESONS AND∑_c⁺BARYON

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A sieve-comparison method is proposed according to the accelerator's data ofcharmed particles to identify the properties of the X-particles observed in high energycosmic ray interactions. The principles of the sieve-comparison method are as follows: 1. The cross section σ _xxof these X-particles produced in pair should be appro-ximately equal to the cross section σ _DDof D meson produced in pair. 2. The empirical selection rules of the decay in weak interaction from the experi-ments using accelerators should be suitable to these X-particles: charmed number|Δ c|=1, strangeness Δ S=Δ c=1, isospin |Δ I₃| =1→|Δ I|=1, (nonlepton). 3. The charge and the decay channel should be in coincidence with the empiricalselection rule, Q= I ₃+( B+ C)/2 for each X particle and it's transverse momentumshould be large ( P _⊥=400-1000MeV/c). 4. For the same kind of the particles, their width-mass ratio ( г/ M) should beof the same order of magnitude. All the X particles observed so far in emulsion chambers have been analyzedaccording to this method, it is found that they are possibly D, D, Σ_c ⁺, Λ_c ⁺, E_cc ⁺, (seetable I). Inversely, we may estimate the mean lives and masses of new charmed parti-cles observed in accelerator's experiments according to cosmic ray's data. The resultsare shown in table II.

References

[1]

K. Niu, Proc. 19th Int. Conf. High Energy Physics, B10(1978), 447, Tokyo, H, Fuchi et al.,宇宙线研究,23 (1978 ). 3.[S] C. Bricman et al.. Phys. Lett., 75B(1978). 1[3] H. Fuchi et al. 15th Int,. Cosmic Ray Conf., 7 (1917),376.[4] L. Baum et al., Phys. Lett., 77B(1978), 337.[5] K. Hoshino et al., 14th Int. Cosmic Conf. 7(1975).2448.[6] M. Peshkin et al,Nucl. Phys., B122(1977),144; A. Pais et al., Plays. Rev., D15(1977), 2529.[7] 赵树松、彭守礼,桑拉子与高能宇宙线中的新粒子,(待发表).

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Zhao Shu-song and Peng Shou-li. COSMIC RAY'S DATA OF MEAN LIVES OF D MESONS AND ∑_c ⁺BARYON[J]. Chinese Physics C, 1980, 4(4): 531-535.

Zhao Shu-song and Peng Shou-li. COSMIC RAY'S DATA OF MEAN LIVES OF D MESONS AND ∑_c ⁺BARYON[J]. Chinese Physics C, 1980, 4(4): 531-535. shu

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Received: 1979-06-14
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

COSMIC RAY'S DATA OF MEAN LIVES OF D MESONS AND∑_c⁺BARYON

Zhao Shu-song
Peng Shou-li

Received Date:1979-06-14
Accepted Date:1900-01-01
Available Online:1980-08-05

Abstract:A sieve-comparison method is proposed according to the accelerator's data ofcharmed particles to identify the properties of the X-particles observed in high energycosmic ray interactions. The principles of the sieve-comparison method are as follows: 1. The cross section σ_xxof these X-particles produced in pair should be appro-ximately equal to the cross section σ_DDof D meson produced in pair. 2. The empirical selection rules of the decay in weak interaction from the experi-ments using accelerators should be suitable to these X-particles: charmed number|Δc|=1, strangeness ΔS=Δc=1, isospin |ΔI₃| =1→|ΔI|=1, (nonlepton). 3. The charge and the decay channel should be in coincidence with the empiricalselection rule,Q=I₃+(B+C)/2 for each X particle and it's transverse momentumshould be large (P_⊥=400-1000MeV/c). 4. For the same kind of the particles, their width-mass ratio (г/M) should beof the same order of magnitude. All the X particles observed so far in emulsion chambers have been analyzedaccording to this method, it is found that they are possibly D,D,Σ_c⁺,Λ_c⁺,E_cc⁺, (seetable I). Inversely, we may estimate the mean lives and masses of new charmed parti-cles observed in accelerator's experiments according to cosmic ray's data. The resultsare shown in table II.