Is d<SUP>*</SUP> a candidate for a hexaquark-dominated exotic state?

HUANG Fei; ZHANG Zong-Ye; SHEN Peng-Nian; WANG Wen-Ling

doi:10.1088/1674-1137/39/7/071001

Chinese Physics C> 2015, Vol. 39> Issue(7) : 071001 DOI: 10.1088/1674-1137/39/7/071001

Is d^* a candidate for a hexaquark-dominated exotic state?

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We confirm our previous prediction of a d* state with I(JP)=0(3+) [Phys. Rev. C 60, 045203 (1999)] and report for the first time based on a microscopic calculation that d* has about 2/3 hidden color (CC) configurations and thus is a hexaquark-dominated exotic state. By performing a more elaborate dynamical coupled-channels investigation of the ΔΔ-CC system within the framework of the resonating group method (RGM) in a chiral quark model, we find that the d* state has a mass of about 2.38--2.42 GeV, a root-mean-square radius (RMS) of 0.76--0.88 fm, and a CC fraction of 66%--68%. The last may cause a rather narrow width for the d* which, together with the quantum numbers and our calculated mass, is consistent with the newly observed resonance-like structure (M≈ 2380 MeV, Γ≈ 70 MeV) in double-pionic fusion reactions reported by the WASA-at-COSY Collaboration.

References

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Booth N E et al. Phys. Rev. Lett., 1961, 7: 35[2] Bashkanov M et al. Phys. Rev. Lett., 2009, 102: 052301[3] Adlarson P et al. (WASA-at-COSY collaboration). Phys. Rev. Lett., 2011, 106: 242302[4] Adlarson P et al. (WASA-at-COSY collaboration SAID DAC). Phys. Rev. Lett., 2014, 112: 202301[5] Adlarson P et al. (WASA-at-COSY collaboration SAID DAC). Phys. Rev. C, 2014, 90: 035204[6] Adlarson P et al. (WASA-at-COSY collaboration). arXiv:1409.2659 [nucl-ex][7] Dyson F J, Xuong N H. Phys. Rev. Lett., 1964, 13: 815[8] Oka M, Yazaki K. Phys. Lett. B, 1980, 90: 41[9] ZHANG Z Y et al. Nucl. Phys. A, 1997, 625: 59[10] YUAN X Q et al. Phys. Rev. C, 1999, 60: 045203[11] LI Q B et al. Nucl. Phys. A, 2001, 683: 487[12] DAI L R et al. Nucl. Phys. A, 2003, 727: 321[13] Kusainov A M et al. Phys. Rev. C, 1991, 44: 2343[14] Glozman L Y, Neudatchin V G, Obukhovsky I T. Phys. Rev. C, 1993, 48: 389[15] Stancu F, Pepin S, Glozman L Y. Phys. Rev. C, 1997, 56: 2779[16] Bashkanov M, Brodsky S J, Clement H. Phys. Lett. B, 2013, 727: 438[17] HUANG H X et al. Phys. Rev. C, 2014, 89: 034001[18] Gal A et al. Phys. Rev. Lett., 2013, 111: 172301

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HUANG Fei, ZHANG Zong-Ye, SHEN Peng-Nian and WANG Wen-Ling. Is d^* a candidate for a hexaquark-dominated exotic state?[J]. Chinese Physics C, 2015, 39(7): 071001. doi: 10.1088/1674-1137/39/7/071001

HUANG Fei, ZHANG Zong-Ye, SHEN Peng-Nian and WANG Wen-Ling. Is d^* a candidate for a hexaquark-dominated exotic state?[J]. Chinese Physics C, 2015, 39(7): 071001. doi: 10.1088/1674-1137/39/7/071001 shu

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Received: 2015-03-23
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

Is d^* a candidate for a hexaquark-dominated exotic state?

Received Date: 2015-03-23
Accepted Date: 1900-01-01
Available Online: 2015-07-05

Abstract: We confirm our previous prediction of a d* state with I(JP)=0(3+) [Phys. Rev. C 60, 045203 (1999)] and report for the first time based on a microscopic calculation that d* has about 2/3 hidden color (CC) configurations and thus is a hexaquark-dominated exotic state. By performing a more elaborate dynamical coupled-channels investigation of the ΔΔ-CC system within the framework of the resonating group method (RGM) in a chiral quark model, we find that the d* state has a mass of about 2.38--2.42 GeV, a root-mean-square radius (RMS) of 0.76--0.88 fm, and a CC fraction of 66%--68%. The last may cause a rather narrow width for the d* which, together with the quantum numbers and our calculated mass, is consistent with the newly observed resonance-like structure (M≈ 2380 MeV, Γ≈ 70 MeV) in double-pionic fusion reactions reported by the WASA-at-COSY Collaboration.