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A Mechanism for Hadron Molecule Production in <i>pp</i>(<i>p</i>) Collisions

Journal of Modern Physics 2013年第12期4卷 1569-1573页

作者： Angelo Esposito Fulvio Piccinini alessandro pilloni Antonio D. Polosa 1Dipartimento di Fisica Sapienza Università di Roma Roma Italy 2Department of Physics Columbia University New York USA 1Dipartimento di Fisica Sapienza Università di Roma Roma Italy 2INFN Sezione di Roma 1 Roma Italy INFN Sezione di Pavia Pavia Italy

The problem of understanding loosely bound hadron molecules prompt production at hadron colliders is still open: how is it possible that meson molecules with binding energy compatible with zero could be formed within the bulk of the hadrons ejected in very high energy collisions? Monte Carlo simulations have been performed in the literature, leading to production cross sections, two orders of magnitude which were smaller than the experimental value. One possible mechanism to reduce this gap could be final state interactions of heavy mesons, but a precise evaluation of such effect is challenged by the presence of pions between the molecular constituents. In this paper, we present a new mechanism by using precisely such comoving pions. Heavy meson pairs can indeed slow down because of elastic scattering with surrounding pions. The number of low-relative-momentum meson pairs increases, thereby enhancing prompt production cross section. In this preliminar simulation, we show that an enhancement of 100 is indeed possible.

关键词： Exotic Spectroscopy Heavy Quark Phenomenology Hadron Scattering Monte Carlo Simulations

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Complete pancreatic heterotopia of gallbladder with hypertrophic duct simulating an adenomyoma

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World Journal of Gastroenterology 2006年第11期12卷 1786-1787页

作者： Luca pilloni alessandro Cois alessandro Uccheddu Rossano Ambu Pierpaolo Coni Gavino Faa Istituto di Anatomia Patologica Dipartimento di Citomorfologia Universita degli Studi di CagliariItaly Semeiotica Chirurgica Dipartimento Chirurgico Materno Infantile e di Scienze delle Immagini Università degli Studi di CagliariItaly Istituto di Anatomia Patologica Dipartimento di Citomorfologia Università degli Studi di CagliariItaly

The gallbladder is an unusual location of pancreatic heterotopia, defined as the presence of pancreatic tissue lacking anatomical and vascular continuity with the main body of the gland. A 28-year-old man presented with anorexia, nausea and pain in the right upper abdomen. On physical examination, the abdomen was tender to palpation and Murphy sign was positive. The patient underwent a cholecystecomy. This case, in our opinion, is very interesting since it permits to consider a controversial issue in the pathology of the gallbladder. The histological appearance of ductal structure in pancreatic heterotopia resembles the histological picture of both Aschoff-Rokitansky （AR） sinuses and adenomyomas. This finding suggests that these lesions are linked by a common histogenetic origin. We suggest that the finding of an adenomyoma in the gallbladder should prompt an extensive sampling of the organ in order to verify the coexistence of pancreatic rests.

关键词： Pancreatic heterotopia Gallbladder Hypertrophic duct Adenomyoma Aschoff-Rokitansky sinuses

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