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http://hdl.handle.net/2445/114893
Title: | Effective field theory with dibaryon fields: Nucleon-nucleon amplitudes at N2LO |
Author: | Soto Riera, Joan Tarrús Castellà, Jaume |
Keywords: | Teoria de camps (Física) Reaccions nuclears Barions Field theory (Physics) Nuclear reactions Baryons |
Issue Date: | 2010 |
Publisher: | American Physical Society |
Abstract: | We calculate the nucleon-nucleon scattering amplitudes in the 1S0 and 3S1−3D1 channels at next-to-next-to-leading order starting from a recently proposed nonrelativistic chiral effective theory, which includes dibaryon fields as fundamental degrees of freedom. We restrict ourselves to center-of-mass energies (E) smaller than the pion mass (mπ) and further divide the calculation into two relative momentum (p) regions, a high-energy one p~mπ≫δmi, δmi being the dibaryon residual masses, and low-energy one p≲δmi. We first match to a lower energy effective theory in which we calculate the amplitudes in the high-energy region. We further match this effective theory to the so-called pionless effective theory in the low-energy region and carry out the calculations in the latter. Dimensional regularization and minimal subtraction scheme are used throughout. For 1S0 channel a good description of the phase shift data is obtained for E≲50 MeV. For the 3S1−3D1 channel, the 3S1 phase shift data is only well described up to E≲20 MeV. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevC.81.014005 |
It is part of: | Physical Review C, 2010, vol. 81, num. 1, p. 014005-1-014005-12 |
URI: | http://hdl.handle.net/2445/114893 |
Related resource: | https://doi.org/10.1103/PhysRevC.81.014005 |
ISSN: | 0556-2813 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Publicacions de projectes de recerca finançats per la UE |
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