منابع مشابه
Pionic deuterium
The strong-interaction shift πD 1s and broadening Γ πD 1s in pionic deuterium have been determined in a high statistics study of the πD(3p-1s) X-ray transition using a high-resolution crystal spectrometer. The pionic deuterium shift will provide constraints for the pion-nucleon isospin scattering lengths extracted from measurements of shift and broadening in pionic hydrogen. The hadronic broade...
متن کاملDibaryon by Double - radiative Capture on Pionic Deuterium
We report a search for d∗ dibaryon production by double-radiative capture on pionic deuterium. The experiment was conducted at the TRIUMF cyclotron using the RMC cylindrical pair spectrometer, and detected γ-ray coincidences following pion stops in liquid deuterium. We found no evidence for narrow dibaryons, and obtained a branching ratio upper limit, BR < 6.7×10 (90% C.L.), for narrow d∗ produ...
متن کاملThe pion - nucleon scattering lengths from pionic deuterium ⋆
We use the framework of effective field theories to discuss the determination of the S-wave πN scattering lengths from the recent high-precision measurements of pionic deuterium observables. The theoretical analysis proceeds in several steps. Initially, the precise value of the pion-deuteron scattering length aπd is extracted from the data. Next, aπd is related to the S-wave πN scattering lengt...
متن کاملFrom Solar Proton Burning to Pionic Deuterium through the Nambu–Jona–Lasinio model of light nuclei
Within the Nambu–Jona–Lasinio model of light nuclei (the NNJL model), describing strong low–energy nuclear interactions, we compute the width of the energy level of the ground state of pionic deuterium. The theoretical value fits well the experimental data. Using the cross sections for the reactions νe + d → p+ p+ e and νe+d → p+n+νe, computed in the NNJL model, and the experimental values of t...
متن کاملPionic Hydrogen at Psi
The measurement of the pion–nucleon scattering lengths constitutes a high–precision test of the methods of Chiral Pertubation Theory (χPT), which is the low–energy approach of QCD. The πN s–wave scattering lengths are related to the strong–interaction shift ǫ1s and width Γ1s of the s–states of the pionic hydrogen atom. ǫ1s and Γ1s are determined from the measured energies and line widths of X–r...
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ژورنال
عنوان ژورنال: EPJ Web of Conferences
سال: 2010
ISSN: 2100-014X
DOI: 10.1051/epjconf/20100303006