Dilepton mass spectra in p+p collisions at s=200 GeV and the contribution from open charm

PHENIX has measured the electron–positron pair mass spectrum from 0 to 8 GeV/c2 in p+p collisions at s=200 GeV. The contributions from light meson decays to e+e− pairs have been determined based on measurements of hadron production cross sections by PHENIX. Within the systematic uncertainty of ∼20%...

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Veröffentlicht in:	Physical review letters 2009-01, Vol.670 (4-5), p.313-320
Hauptverfasser:	Bathe, S., Belikov, S., Buesching, H., Bumazhnov, V., Chang, B.S., Chiba, J., Choi, I.J., Chujo, T., Cleven, C.R., Csanád, M., Deaton, M.B., Dehmelt, K., Dietzsch, O., Dzhordzhadze, V., Egdemir, J., Ellinghaus, F., Esumi, S., Fleuret, F., Fokin, S.L., Franz, A., Fukao, Y., Fusayasu, T., Gadrat, S., Gonin, M., Gosset, J., Goto, Y., Granier de Cassagnac, R., Grosse Perdekamp, M., Gustafsson, H.-Å., Harada, H., Haslum, E., Hayano, R., Hemmick, T.K., Hobbs, R., Hong, B., Inaba, M., Isenhower, D., Jin, J., Jinnouchi, O., Jouan, D., Kang, J.H., Kanou, H., Kawall, D., Kikuchi, J., Kim, D.J., Kim, E., Kurihara, N., Kurita, K., Kyle, G.S., Lai, Y.-S., Lajoie, J.G., Lebedev, A., Leite, M.A.L., Liška, T., Li, X., Makdisi, Y.I., Mašek, L., McGaughey, P.L., Miller, T.E., Moukhanova, T.V., Mukhopadhyay, D., Murata, J., Nakamiya, Y., Ohnishi, H., Okada, H., Okada, K., Oka, M., Omiwade, O.O., Pal, D., Park, W.J., Pereira, H., Qu, H., Rakotozafindrabe, A., Romana, A., Rosendahl, S.S.E., Sakai, S., Sakata, H., Seele, J., Semenov, V., Seto, R., Shibata, T.-A., Shoji, K., Sickles, A., Skutnik, S., Sorensen, S.P., Suire, C., Sziklai, J., Tabaru, T., Taketani, A., Tanaka, Y., Togawa, M., Tomášek, L., Watanabe, Y., White, S.N., Winter, D., Yamaguchi, Y.L., Yasin, Z., Yokkaichi, S., Younus, I., Zajc, W.A.
Format:	Artikel
Sprache:	eng
Schlagworte:	CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS CROSS SECTIONS Exact sciences and technology HADRONS LEPTONS MASS SPECTRA MESONS Nuclear physics Physics PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PRODUCTION QUANTUM CHROMODYNAMICS SEMILEPTONIC DECAY SHAPE The physics of elementary particles and fields
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Zusammenfassung:	PHENIX has measured the electron–positron pair mass spectrum from 0 to 8 GeV/c2 in p+p collisions at s=200 GeV. The contributions from light meson decays to e+e− pairs have been determined based on measurements of hadron production cross sections by PHENIX. Within the systematic uncertainty of ∼20% they account for all e+e− pairs in the mass region below ∼1 GeV/c2. The e+e− pair yield remaining after subtracting these contributions is dominated by semileptonic decays of charmed hadrons correlated through flavor conservation. Using the spectral shape predicted by PYTHIA, we estimate the charm production cross section to be 544±39(stat)±142(syst)±200(model) μb, which is consistent with QCD calculations and measurements of single leptons by PHENIX.
ISSN:	0370-2693 0031-9007 1873-2445 1079-7114
DOI:	10.1016/j.physletb.2008.10.064