56,605 research outputs found
Nucleon-Nucleon Scattering and Effective Field Theory: Including Pions Non-perturbatively
Next to leading order effective field theory calculations are performed for NN scattering using subtractive renormalization procedure. One pion
exchange and contact interaction potentials are iterated using
Lippman-Schwinger equation. Satisfactory fit to the Nijmegen data is obtained
for the momenta up to 300 MeV in the centre of mass frame. Phase shifts are
also compared with the results of KSW approach where pions are included
perturbatively.Comment: 7 pages, 3 figures, references added, to appear in Phys. Lett.
The aeronomy story: A memoir
Research in atmospheric physics leading to the identification of the metastable states of nitrogen is described. These forbidden nitrogen atomic molecular radiations were then identified in auroral spectra
The Missed Appointment: A Resident\u27s Journal through Activity to Introspection
There was one experience during my medical school psychiatry rotation that I could not forget. In a classroom on the cardiology ward, I listened, transfixed like a child at a magic show, as a psychiatrist interviewed a man who was recovering from a heart attack. Initially the man denied any stresses in his life that might have affected his health, but as he went on, a different story unfolded. He spoke of his recent retirement, his wife\u27s dissatisfactions and hostility, his disappointment with his children, his growing sense of failure and futility, and the recurring tightness in his chest that he had tried to ignore. His doctors colluded in his denial, for they were too busy with his EKGs and cardiac enzymes to wonder about his emotional well-being. I could see the despair, but also the hope in his face as he talked with the psychiatrist. At the end of the interview the patient was in tears, and though I hid them from my colleagues, so was I. Powerful and mysterious stuff, this business of feelings, much more complicated than anything I had yet encountered in my medical training, but also much more threatening. It seemed that talking to patients about their feelings would bring into question my own feelings, a Pandora\u27s box I wasn\u27t ready to open. A seed had been planted, but it was not to be tended to for some time to come
Gamma ray lines from TeV dark matter
We calculate, using unitarity, a lower bound on the branching ratio
and , where is any halo
dark matter particle that has as one of the major annihilation modes.
Examples of such particles are supersymmetric particles with a dominant
Higgsino component, or heavy triplet neutrinos. A substantial branching ratio
is found for the and modes. We estimate the strength
of the monoenergetic ray lines that result from such annihilations in
the Galactic or LMC halos. (Latex file; 2 compressed uuencoded postscript
figures available by anonymous ftp from vanosf.physto.se in file
pub/figures/lines.uu)Comment: 11 pages, USITP-94-03; PAR-LPTHE 94-0
Measuring CMB polarisation with the Planck HFI
We describe the Planck HFI design and expected performances for measuring CMB
polarisation.Comment: Proceedings of the Pol2001 "Astrophysical Polarised Backgrounds"
conference, Bologna, 9-12 october 200
- …