Measurement of inclusive (D(s)(+/-)) photoproduction at HERA

Breitweg, J; Chekanov, S; Derrick, M; Krakauer, D; Magill, S; Musgrave, B; Pellegrino, A; Repond, J; Stanek, R; Yoshida, R; Mattingly, Mck; Abbiendi, G; Anselmo, F; Antonioli, P; Bari, G; Basile, M; Bellagamba, L; Boscherini, D; Bruni, A; Bruni, C; Romeo, Gc; Castellini, G; Cifarelli, L; Cindolo, F; Contin, A; Coppola, N; Corradi, M; De Pasquale, S; Giusti, P; Iacobucci, G; Laurenti, G; Levi, G; Margotti, A; Massam, T; Nania, R; Palmonari, F; Pesci, A; Polini, A; Sartorelli, G; Garcia, Yz; Zichichi, A; Amelung, C; Bornheim, A; Brock, I; Coboken, K; Crittenden, J; Deffner, R; Hartmann, H; Heinloth, K; Hilger, E; Irrgang, P; Jakob, Hp; Kappes, A; Katz, Uf; Kerger, R; Paul, E; Schnurbusch, H; Stifutkin, A; Tandler, J; Voss, Kc; Weber, A; Wieber, H; Bailey, Ds; Barret, O; Brook, Nh; Foster, B; Heath, Gp; Heath, Hf; McFall, Jd; Piccioni, D; Rodrigues, E; Scott, J; Tapper, Rj; Capua, Marcella; Mastroberardino, Anna; Schioppa, M; Susinno, G; Jeoung, Hy; Kim, Jy; Lee, Jh; Lim, It; Ma, Kj; Pac, My; Caldwell, A; Liu, W; Liu, X; Mellado, B; Paganis, S; Sampson, S; Schmidke, Wb; Sciulli, F; Chwastowski, J; Eskreys, A; Figiel, J; Klimek, K; Olkiewicz, K; Piotrzkowski, K; Przybycien, Mb; Stopa, P; Zawiejski, L; Bednarek, B; Jelen, K; Kisielewska, D; Kowal, Am; Kowalski, T; Przybycien, M; Rulikowska Zarebska, E; Suszycki, L; Szuba, D; Kotanski, A; Bauerdick, Lat; Behrens, U; Bienlein, Jk; Burgard, C; Dannheim, D; Desler, K; Drews, G; Fox Murphy, A; Fricke, U; Goebel, F; Gottlicher, P; Graciani, R; Haas, T; Hain, W; Hartner, Gf; Hasell, D; Hebbel, K; Johnson, Kf; Kasemann, M; Koch, W; Kotz, U; Kowalski, H; Lindemann, L; Lohr, B; Martinez, M; Milite, M; Monteiro, T; Moritz, M; Notz, D; Pelucchi, F; Petrucci, Mc; Rohde, M; Saull, Prb; Savin, Aa; Schneekloth, U; Selonke, F; Sievers, M; Stonjek, S; Tassi, Enrico; Wolf, G; Wollmer, U; Youngman, C; Zeuner, W; Coldewey, C; Viani, Ald; Meyer, A; Schlenstedt, S; Straub, Pb; Barbagli, G; Gallo, E; Pelfer, P; Maccarrone, G; Votano, L; Bamberger, A; Benen, A; Eisenhardt, S; Markun, P; Raach, H; Wolfle, S; Bussey, Pj; Doyle, At; Lee, Sw; Macdonald, N; McCance, Gj; Saxon, Dh; Sinclair, Le; Skillicorn, Io; Waugh, R; Bohnet, I; Gendner, N; Holm, U; Meyer Larsen, A; Salehi, H; Wick, K; Garfagnini, A; Gialas, I; Gladilin, Lk; Kcira, D; Klanner, R; Lohrmann, E; Poelz, G; Zetsche, F; Goncalo, R; Long, Kr; Miller, Db; Tapper, Ad; Walker, R; Mallik, U; Cloth, P; Filges, D; Ishii, T; Kuze, M; Nagano, K; Tokushuku, K; Yamada, S; Yamazaki, Y; Ahn, Sh; Lee, Sb; Park, Sk; Lim, H; Park, Ih; Son, D; Barreiro, F; Garcia, G; Glasman, C; Gonzalez, O; Labarga, L; del Peso, J; Redondo, I; Terron, J; Barbi, M; Corriveau, F; Hanna, Ds; Ochs, A; Padhi, S; Riveline, M; Stairs, Dg; Wing, M; Tsurugai, T; Bashkirov, V; Dolgoshein, Ba; Dementiev, Rk; Ermolov, Pf; Golubkov, Ya; Katkov, Ii; Khein, La; Korotkova, Na; Korzhavina, Ia; Kuzmin, Va; Lukina, Oy; Proskuryakov, As; Shcheglova, Lm; Solomin, An; Vlasov, Nn; Zotkin, Sa; Bokel, C; Botje, M; Brummer, N; Engelen, J; Grijpink, S; Koffeman, E; Kooijman, P; Schagen, S; van Sighem, A; Tiecke, H; Tuning, N; Velthuis, Jj; Vossebeld, J; Wiggers, I; de Wolf, E; Acosta, D; Bylsma, B; Durkin, Ls; Gilmore, J; Ginsburg, Cm; Kim, Cl; Ling, Ty; Boogert, S; Cooper Sarkar AM,; Devenish, Rce; Grosse Knetter, J; Matsushita, T; Ruske, O; Sutton, Mr; Walczak, R; Bertolin, A; Brugnera, R; Carlin, R; Dal Corso, F; Dosselli, U; Dusini, S; Limentani, S; Morandin, M; Posocco, M; Stanco, I; Stroili, R; Voci, C; Adamczyk, L; Iannotti, L; Oh, By; Okrasinski, Jr; Toothacker, Ws; Whitmore, Jj; Iga, Y; D'Agostini, G; Marini, G; Nigro, A; Cormack, C; Hart, Jc; McCubbin, Na; Shah, Tp; Epperson, D; Heusch, C; Sadrozinski, Hfw; Seiden, A; Wichmann, R; Williams, Dc; Pavel, N; Abramowicz, H; Dagan, S; Kananov, S; Kreisel, A; Levy, A; Abe, T; Fusayasu, T; Umemori, K; Yamashita, T; Hamatsu, R; Hirose, T; Inuzuka, M; Kitamura, S; Nishimura, T; Arneodo, M; Cartiglia, N; Cirio, R; Costa, M; Ferrero, Mi; Maselli, S; Monaco, V; Peroni, C; Ruspa, M; Sacchi, R; Solano, A; Staiano, A; Dardo, M; Bailey, Dc; Fagerstroem, Cp; Galea, R; Koop, T; Levman, Gm; Martin, Jf; Orr, Rs; Polenz, S; Sabetfakhri, A; Simmons, D; Butterworth, Jm; Catterall, Cd; Hayes, Me; Heaphy, Ea; Jones, Tw; Lane, Jb; West, Bj; Ciborowski, J; Ciesielski, R; Grzelak, G; Nowak, Rj; Pawlak, Jm; Pawlak, R; Smalska, B; Tymieniecka, T; Wroblewski, Ak; Zakrzewski, Ja; Zarnecki, Af; Adamus, M; Gadaj, T; Deppe, O; Eisenberg, Y; Hochman, D; Karshon, U; Badgett, Wf; Chapin, D; Cross, R; Foudas, C; Mattingly, S; Reeder, Dd; Smith, Wh; Vaiciulis, A; Wildschek, T; Wodarczyk, M; Deshpande, A; Dhawan, S; Hughes, Vw; Bhadra, S; Catterall, C; Cole, Je; Frisken, Wr; Hall Wilton, R; Khakzad, M; Menary, S.

doi:10.1016/S0370-2693(00)00431-7

The first measurement of inclusive D(s)(+/-) photoproduction at HERA has been performed with the ZEUS detector for photon-proton centre-of-mass energies; 130 < W < 280 GeV The measured cross section for 3 < p(perpendicular to)(Ds) < 12 GeV and \eta(Ds)\ < 1.5 is sigma(ep-->DsX) = 3.79 +/- 0.59(stat.)(-0.46)(+0.26)(syst.) +/- 0.94(br.) nb, where the last error arises from the uncertainty in the D(s)(+/-) decay branching ratio. The measurements are compared with inclusive D*(+/-) photoproduction cross sections in the same kinematic region and with QCD calculations. The D(s)(+/-) cross sections lie above a fixed-order next-to-leading order calculation and agree better with a tree-level O(alpha alpha(s)(3)) calculation that was tuned to describe the ZEUS D* (+/-) cross sections. The ratio of D(s)(+/-) to D*(+/-) cross sections is 0.41 +/- 0.07(stat.)(-0.05)(+0.03)(syst.) +/- 0.10 (br.). From this ratio, the strangeness-suppression factor in charm photoproduction, within the LUND string fragmentation model, has been calculated to be gamma(s)= 0.27 +/- 0.05 +/- 0.07(br.). The cross-section ratio and gamma(s) are in good agreement with those obtained in charm production in e(+)e(-) annihilation. (C) 2000 Elsevier Science B.V. All rights reserved.

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Titolo:	Measurement of inclusive (D(s)(+/-)) photoproduction at HERA
Autori:	Breitweg J Chekanov S Derrick M Krakauer D Magill S Musgrave B Pellegrino A Repond J Stanek R Yoshida R Mattingly MCK Abbiendi G Anselmo F Antonioli P Bari G Basile M Bellagamba L Boscherini D Bruni A Bruni C Romeo GC Castellini G Cifarelli L Cindolo F Contin A Coppola N Corradi M De Pasquale S Giusti P Iacobucci G Laurenti G Levi G Margotti A Massam T Nania R Palmonari F Pesci A Polini A Sartorelli G Garcia YZ Zichichi A Amelung C Bornheim A Brock I Coboken K Crittenden J Deffner R Hartmann H Heinloth K Hilger E Irrgang P Jakob HP Kappes A Katz UF Kerger R Paul E Schnurbusch H Stifutkin A Tandler J Voss KC Weber A Wieber H Bailey DS Barret O Brook NH Foster B Heath GP Heath HF McFall JD Piccioni D Rodrigues E Scott J Tapper RJ CAPUA, Marcella MASTROBERARDINO, Anna SCHIOPPA, Marco Susinno G Jeoung HY Kim JY Lee JH Lim IT Ma KJ Pac MY Caldwell A Liu W Liu X Mellado B Paganis S Sampson S Schmidke WB Sciulli F Chwastowski J Eskreys A Figiel J Klimek K Olkiewicz K Piotrzkowski K Przybycien MB Stopa P Zawiejski L Bednarek B Jelen K Kisielewska D Kowal AM Kowalski T Przybycien M Rulikowska Zarebska E Suszycki L Szuba D Kotanski A Bauerdick LAT Behrens U Bienlein JK Burgard C Dannheim D Desler K Drews G Fox Murphy A Fricke U Goebel F Gottlicher P Graciani R Haas T Hain W Hartner GF Hasell D Hebbel K Johnson KF Kasemann M Koch W Kotz U Kowalski H Lindemann L Lohr B Martinez M Milite M Monteiro T Moritz M Notz D Pelucchi F Petrucci MC Rohde M Saull PRB Savin AA Schneekloth U Selonke F Sievers M Stonjek S TASSI, Enrico Wolf G Wollmer U Youngman C Zeuner W Coldewey C Viani ALD Meyer A Schlenstedt S Straub PB Barbagli G Gallo E Pelfer P Maccarrone G Votano L Bamberger A Benen A Eisenhardt S Markun P Raach H Wolfle S Bussey PJ Doyle AT Lee SW Macdonald N McCance GJ Saxon DH Sinclair LE Skillicorn IO Waugh R Bohnet I Gendner N Holm U Meyer Larsen A Salehi H Wick K Garfagnini A Gialas I Gladilin LK Kcira D Klanner R Lohrmann E Poelz G Zetsche F Goncalo R Long KR Miller DB Tapper AD Walker R Mallik U Cloth P Filges D Ishii T Kuze M Nagano K Tokushuku K Yamada S Yamazaki Y Ahn SH Lee SB Park SK Lim H Park IH Son D Barreiro F Garcia G Glasman C Gonzalez O Labarga L del Peso J Redondo I Terron J Barbi M Corriveau F Hanna DS Ochs A Padhi S Riveline M Stairs DG Wing M Tsurugai T Bashkirov V Dolgoshein BA Dementiev RK Ermolov PF Golubkov YA Katkov II Khein LA Korotkova NA Korzhavina IA Kuzmin VA Lukina OY Proskuryakov AS Shcheglova LM Solomin AN Vlasov NN Zotkin SA Bokel C Botje M Brummer N Engelen J Grijpink S Koffeman E Kooijman P Schagen S van Sighem A Tiecke H Tuning N Velthuis JJ Vossebeld J Wiggers I de Wolf E Acosta D Bylsma B Durkin LS Gilmore J Ginsburg CM Kim CL Ling TY Boogert S Cooper Sarkar AM Devenish RCE Grosse Knetter J Matsushita T Ruske O Sutton MR Walczak R Bertolin A Brugnera R Carlin R Dal Corso F Dosselli U Dusini S Limentani S Morandin M Posocco M Stanco I Stroili R Voci C Adamczyk L Iannotti L Oh BY Okrasinski JR Toothacker WS Whitmore JJ Iga Y D'Agostini G Marini G Nigro A Cormack C Hart JC McCubbin NA Shah TP Epperson D Heusch C Sadrozinski HFW Seiden A Wichmann R Williams DC Pavel N Abramowicz H Dagan S Kananov S Kreisel A Levy A Abe T Fusayasu T Umemori K Yamashita T Hamatsu R Hirose T Inuzuka M Kitamura S Nishimura T Arneodo M Cartiglia N Cirio R Costa M Ferrero MI Maselli S Monaco V Peroni C Ruspa M Sacchi R Solano A Staiano A Dardo M Bailey DC Fagerstroem CP Galea R Koop T Levman GM Martin JF Orr RS Polenz S Sabetfakhri A Simmons D Butterworth JM Catterall CD Hayes ME Heaphy EA Jones TW Lane JB West BJ Ciborowski J Ciesielski R Grzelak G Nowak RJ Pawlak JM Pawlak R Smalska B Tymieniecka T Wroblewski AK Zakrzewski JA Zarnecki AF Adamus M Gadaj T Deppe O Eisenberg Y Hochman D Karshon U Badgett WF Chapin D Cross R Foudas C Mattingly S Reeder DD Smith WH Vaiciulis A Wildschek T Wodarczyk M Deshpande A Dhawan S Hughes VW Bhadra S Catterall C Cole JE Frisken WR Hall Wilton R Khakzad M Menary S. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2000
Rivista:	PHYSICS LETTERS. SECTION B
Abstract:	The first measurement of inclusive D(s)(+/-) photoproduction at HERA has been performed with the ZEUS detector for photon-proton centre-of-mass energies; 130 < W < 280 GeV The measured cross section for 3 < p(perpendicular to)(Ds) < 12 GeV and \eta(Ds)\ < 1.5 is sigma(ep-->DsX) = 3.79 +/- 0.59(stat.)(-0.46)(+0.26)(syst.) +/- 0.94(br.) nb, where the last error arises from the uncertainty in the D(s)(+/-) decay branching ratio. The measurements are compared with inclusive D(+/-) photoproduction cross sections in the same kinematic region and with QCD calculations. The D(s)(+/-) cross sections lie above a fixed-order next-to-leading order calculation and agree better with a tree-level O(alpha alpha(s)(3)) calculation that was tuned to describe the ZEUS D (+/-) cross sections. The ratio of D(s)(+/-) to D*(+/-) cross sections is 0.41 +/- 0.07(stat.)(-0.05)(+0.03)(syst.) +/- 0.10 (br.). From this ratio, the strangeness-suppression factor in charm photoproduction, within the LUND string fragmentation model, has been calculated to be gamma(s)= 0.27 +/- 0.05 +/- 0.07(br.). The cross-section ratio and gamma(s) are in good agreement with those obtained in charm production in e(+)e(-) annihilation. (C) 2000 Elsevier Science B.V. All rights reserved.
Handle:	http://hdl.handle.net/20.500.11770/126382
Appare nelle tipologie:	1.1 Articolo in rivista

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