QCD sum rules study of the meson Z+ (4430)

Su Houng Lee; Antonio Mihara; Fernando S. Navarra; Marina Nielsen

doi:10.1016/j.physletb.2008.01.062

QCD sum rules study of the meson Z⁺ (4430)

Su Houng Lee, Antonio Mihara, Fernando S. Navarra, Marina Nielsen

Department of Physics

Research output: Contribution to journal › Article › peer-review

73 Citations (Scopus)

Abstract

We use QCD sum rules to study the recently observed meson Z⁺ (4430), considered as a D^* D₁ molecule with J^P = 0^-. We consider the contributions of condensates up to dimension eight and work at leading order in α_s. We get m_Z = (4.40 ± 0.10) GeV in a very good agreement with the experimental value. We also make predictions for the analogous mesons Z_s and Z_{b b} considered as D_s^* D₁ and B^* B₁ molecules, respectively. For Z_s we predict m_Zs = (4.70 ± 0.06) GeV, which is above the D_s^* D₁ threshold, indicating that it is probably a very broad state and, therefore, difficult to observe experimentally. For Z_{b b} we predict m_{Zb b} = (10.74 ± 0.12) GeV, in agreement with quark model predictions.

Original language	English
Pages (from-to)	28-32
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	661
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2008.01.062
Publication status	Published - 2008 Mar

Bibliographical note

Funding Information:
This work has been partly supported by FAPESP and CNPq-Brazil, and by the Korea Research Foundation KRF-2006-C00011.

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

Access to Document

10.1016/j.physletb.2008.01.062

Cite this

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title = "QCD sum rules study of the meson Z+ (4430)",

abstract = "We use QCD sum rules to study the recently observed meson Z+ (4430), considered as a D* D1 molecule with JP = 0-. We consider the contributions of condensates up to dimension eight and work at leading order in αs. We get mZ = (4.40 ± 0.10) GeV in a very good agreement with the experimental value. We also make predictions for the analogous mesons Zs and Zb b considered as Ds* D1 and B* B1 molecules, respectively. For Zs we predict mZs = (4.70 ± 0.06) GeV, which is above the Ds* D1 threshold, indicating that it is probably a very broad state and, therefore, difficult to observe experimentally. For Zb b we predict mZb b = (10.74 ± 0.12) GeV, in agreement with quark model predictions.",

author = "Lee, {Su Houng} and Antonio Mihara and Navarra, {Fernando S.} and Marina Nielsen",

note = "Funding Information: This work has been partly supported by FAPESP and CNPq-Brazil, and by the Korea Research Foundation KRF-2006-C00011.",

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AU - Lee, Su Houng

AU - Mihara, Antonio

AU - Navarra, Fernando S.

AU - Nielsen, Marina

N1 - Funding Information: This work has been partly supported by FAPESP and CNPq-Brazil, and by the Korea Research Foundation KRF-2006-C00011.

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AB - We use QCD sum rules to study the recently observed meson Z+ (4430), considered as a D* D1 molecule with JP = 0-. We consider the contributions of condensates up to dimension eight and work at leading order in αs. We get mZ = (4.40 ± 0.10) GeV in a very good agreement with the experimental value. We also make predictions for the analogous mesons Zs and Zb b considered as Ds* D1 and B* B1 molecules, respectively. For Zs we predict mZs = (4.70 ± 0.06) GeV, which is above the Ds* D1 threshold, indicating that it is probably a very broad state and, therefore, difficult to observe experimentally. For Zb b we predict mZb b = (10.74 ± 0.12) GeV, in agreement with quark model predictions.

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