Results of a search for the h[sub c]([sup 1]P[sub 1]) state of charmonium in the eta[sub c] gamma and J/psi pi[sup 0] decay modes

@article{Andreotti:PRD:hc:2005, abstract = {We report evidence for the hc state of charmonium in its etacgamma decay mode and lack of evidence in the J/psipi0 mode. We studied these channels in [overline p]p annihilations near the center of gravity of the 3PJ states, where the hc was reported in the J/psipi0 mode by E760, our previous experiment, at 3526.2\&\#177;0.15\&\#177;0.2 MeV, with GammaR\<=1 MeV. We observe an event excess in the etacgamma mode near 3526\ MeV. Testing the null hypothesis of a linearly varying background cross section against the alternate hypothesis that includes a resonance near 3526\ MeV, we reject the null hypothesis with [script P]~0.001. The resonance mass is 3525.8\&\#177;0.2\&\#177;0.2 MeV and the resonance width \<=1 MeV. We estimate 10.0\&\#177;3.5\<Gamma[overline p]p[script B]etacgamma\<12.0\&\#177;4.5 eV, corresponding to fixed values 0.5\<GammaR\<1.0 MeV. We find no event excess within the search region in the J/psipi0 mode.}, author = {Andreotti, M. and Bagnasco, S. and Baldini, W. and Bettoni, D. and Borreani, G. and Buzzo, A. and Calabrese, R. and Cester, R. and Cibinetto, G. and Dalpiaz, P. and Garzoglio, G. and Gollwitzer, K. E. and Graham, M. and Hu, M. and Joffe, D. and Kasper, J. and Lasio, G. and Lo Vetere, M. and Luppi, E. and Macr\`i, M. and Mandelkern, M. and Marchetto, F. and Marinelli, M. and Menichetti, E. and Metreveli, Z. and Mussa, R. and Negrini, M. and Obertino, M. M. and Pallavicini, M. and Pastrone, N. and Patrignani, C. and Pedlar, T. K. and Pordes, S. and Robutti, E. and Roethel, W. and Rosen, J. L. and Rumerio, P. and Rusack, R. and Santroni, A. and Schultz, J. and Seo, S. H. and Seth, K. K. and Stancari, G. and Stancari, M. and Tomaradze, A. and Uman, I. and Iii, Vidnovic T. and Werkema, S. and Zweber}, citeulike-article-id = {3041022}, doi = {10.1103/PhysRevD.72.032001}, journal = {Physical Review D (Particles and Fields)}, keywords = {e835, mypubs}, number = {3}, posted-at = {2008-07-24 20:04:49}, priority = {2}, publisher = {APS}, title = {Results of a search for the h[sub c]([sup 1]P[sub 1]) state of charmonium in the eta[sub c] gamma and J/psi pi[sup 0] decay modes}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRVDAQ000072000003032001000001\&idtype=cvips\&gifs=yes}, volume = {72}, year = {2005} }

TY - JOUR ID - Andreotti:PRD:hc:2005 L3 - citeulike-article-id:3041022 TI - Results of a search for the h[sub c]([sup 1]P[sub 1]) state of charmonium in the eta[sub c] gamma and J/psi pi[sup 0] decay modes JF - Physical Review D (Particles and Fields) VL - 72 IS - 3 PB - APS N2 - We report evidence for the hc state of charmonium in its etacgamma decay mode and lack of evidence in the J/psipi0 mode. We studied these channels in [overline p]p annihilations near the center of gravity of the 3PJ states, where the hc was reported in the J/psipi0 mode by E760, our previous experiment, at 3526.2±0.15±0.2 MeV, with GammaR<=1 MeV. We observe an event excess in the etacgamma mode near 3526 MeV. Testing the null hypothesis of a linearly varying background cross section against the alternate hypothesis that includes a resonance near 3526 MeV, we reject the null hypothesis with [script P]~0.001. The resonance mass is 3525.8±0.2±0.2 MeV and the resonance width <=1 MeV. We estimate 10.0±3.5<Gamma[overline p]p[script B]etacgamma<12.0±4.5 eV, corresponding to fixed values 0.5<GammaR<1.0 MeV. We find no event excess within the search region in the J/psipi0 mode. KW - e835 KW - mypubs AU - Andreotti, M AU - Bagnasco, S AU - Baldini, W AU - Bettoni, D AU - Borreani, G AU - Buzzo, A AU - Calabrese, R AU - Cester, R AU - Cibinetto, G AU - Dalpiaz, P AU - Garzoglio, G AU - Gollwitzer, KE AU - Graham, M AU - Hu, M AU - Joffe, D AU - Kasper, J AU - Lasio, G AU - Lo Vetere, M AU - Luppi, E AU - Macr\`i, M AU - Mandelkern, M AU - Marchetto, F AU - Marinelli, M AU - Menichetti, E AU - Metreveli, Z AU - Mussa, R AU - Negrini, M AU - Obertino, MM AU - Pallavicini, M AU - Pastrone, N AU - Patrignani, C AU - Pedlar, TK AU - Pordes, S AU - Robutti, E AU - Roethel, W AU - Rosen, JL AU - Rumerio, P AU - Rusack, R AU - Santroni, A AU - Schultz, J AU - Seo, SH AU - Seth, KK AU - Stancari, G AU - Stancari, M AU - Tomaradze, A AU - Uman, I AU - Iii, Vidnovic AU - Werkema, S AU - Zweber PY - 2005/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRVDAQ000072000003032001000001&idtype=cvips&gifs=yes ER -