Role of the Λc+(2940) in the πpDD0p reaction close to threshold

Ju-Jun Xie, Yu-Bing Dong, and Xu Cao
Phys. Rev. D 92, 034029 – Published 31 August 2015

Abstract

We report on a theoretical study of the πpDD0p reaction near threshold within an effective Lagrangian approach. The production process is described by t-channel D*0 meson exchange, s-channel nucleon pole, and u-channel Σc++ exchange. In our work, the final D0p results from the ground Λc+(2286) state and also dominantly from the excited Λc+(2940) state which is assumed as a D*0p molecular state with spin parity JP=12+ or 12. We calculate the total cross section of the πpDD0p reaction. It is shown that the spin-parity assignment of 12 for Λc+(2940) gives a sizable enhancement for the total cross section in comparison with a choice of Jp=12+. However, our theoretical result of the total cross section is sensitive to the value of the cutoff parameter involved in the form factor of the exchanged off-shell particles. Moreover, we also calculate the second order differential cross section and find it can be used to determine the parity of the Λc+(2940). It is expected that our model calculations can be tested by future experiments at J-PARC in Japan.

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  • Received 10 June 2015

DOI:https://doi.org/10.1103/PhysRevD.92.034029

© 2015 American Physical Society

Authors & Affiliations

Ju-Jun Xie1,2,3,*, Yu-Bing Dong4,5,†, and Xu Cao1,2,3,‡

  • 1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  • 2Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS and Lanzhou University, Lanzhou 730000, China
  • 3State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 4Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, China
  • 5Theoretical Physics Center for Science Facilities (TPCSF), CAS, Beijing 100049, China

  • *xiejujun@impcas.ac.cn
  • dongyb@ihep.ac.cn
  • caoxu@impcas.ac.cn

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Vol. 92, Iss. 3 — 1 August 2015

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