Nucleon-Nucleon Scattering and Effective Field Theory: Including Pions Non-perturbatively

Next to leading order effective field theory calculations are performed for ${}^1S_0$ 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 $\chi\chi\to \gamma\gamma$ and $\chi\chi\to \gamma Z$, where $\chi$ is any halo dark matter particle that has $W^+W^-$ 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 $\gamma\gamma$ and $\gamma Z$ modes. We estimate the strength of the monoenergetic $\gamma$ 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