PHOTOPRODUCTION OF J PSI MESONS AT HERA

Authors
AHMED T AID S ANDREEV V ANDRIEU B APPUHN RD ARPAGAUS M BABAEV A BAEHR J BAN J BARANOV P BARRELET E BARTEL W BARTH M BASSLER U BECK HP BEHREND HJ BELOUSOV A BERGER C BERGSTEIN H BERNARDI G BERNET R BERTRANDCOREMANS G BESANCON M BEYER R BIDDULPH P BIZOT JC BLOBEL V BORRAS K BOTTERWECK F BOUDRY V BRAEMER A BRASSE F BRAUNSCHWEIG W BRISSON V BRUNCKO D BRUNE C BUCHHOLZ R BUNGENER L BURGER J BUSSER FW BUNIATIAN A BURKE S BUSCHHORN G CAMPBELL AJ CARLI T CHARLES F CLARKE D CLEGG AB COLOMBO M CONTRERAS JG COUGHLAN JA COURAU A COUTURES C COZZIKA G CRIEGEE L CUSSANS DG CVACH J DAGORET S DAINTON JB DANILOV M DAU WD DAUM K DAVID M DEFFUR E DELCOURT B DELBUONO L DEROECK A DEWOLF EA DINEZZA P DOLLFUS C DOWELL JD DREIS HB DUBOC J DULLMANN D DUNGER O DUHM H EBERT J EBERT TR ECKERLIN G EFREMENKO V EGLI S EHRLICHMANN H EICHENBERGER S EICHLER R EISELE F EISENHANDLER E ELLISON RJ ELSEN E ERDMANN M ERDMANN W EVRARD E FAVART L FEDOTOV A FEEKEN D FELST R FELTESSE J FERENCEI J FERRAROTTO F FLAMM K FLEISCHER M FLIESER M FLUGGE G FOMENKO A FOMINYKH B FORBUSH M FORMANEK J FOSTER JM FRANKE G FRETWURST E GABATHULER E GABATHULER K GAMERDINGER K GARVEY J GAYLER J GEBAUER M GELLRICH A GENZEL H GERHARDS R GOERLACH U GOERLICH L GOGITIDZE N GOLDBERG M GOLDNE RD GONZALEZPINEIRO B GOODALL AM GORELOV I GORITCHEV P GRAB C GRASSLER H GRASSLER R GREENSHAW T GRINDHAMMER G GRUBER A GRUBER C HAACK J HAIDT D HAJDUK L HAMON O HAMPEL M HANLON EM HAPKE M HAYNES WJ HEATERINGTON J HEDBERG V HEINZELMANN G HENDERSON RCW HENSCHEL H HERMA R HERYNEK I HESS MF HILDESHEIM W HILL P HILLER KH HILTON CD HLADKY J HOEGER KC HOPPNER M HORISBERGER R HUET P HUFNAGEL H IBBOTSON M ITTERBECK H JABIOL MA JACHOLKOWSKA A JACOBSSON C JAFFRE M JANOTH J JANSEN T JONSSON L JOHANNSEN K JOHNSON DP JOHNSON L JUNG H KALMUS PIP KANT D KASCHOWITZ R KASSELMANN P KATHAGE U KAUFMANN HH KAZARIAN S KENYON IR KERMICHE S KEUKER C KIESLING C KLEIN M KLEINWORT C KNIES G KO W KOHLER T KOLANOSKI H KOLE F KOLYA SD KORBEL V KORN M KOSTKA P KOTELNIKOV SK KRASNY MW KREHBIEL H KRUCKER D KRUGER U KRUNERMARQUIS U KUBENKA JP KUSTER H KUHLEN M KURCA T KURZHOFER J KUZNIK B LACOUR D LAMARCHE F LANDER R LANDON MPJ LANGE W LANIUS P LAPORTE JF LEBEDEV A LEVERENZ C LEVONIAN S LEY C LINDNER A LINDSTROM G LINSEL F LIPINSKI J LIST B LOCH P LOHMANDER H LOPEZ GC LUKE D MAGNUSSEN N MALINOVSKI E MANI S MARACEK R MARAGE P MARKS J MARSHALL R MARTENS J MARTIN R MARTYN HU MARTYNIAK J MASSON S MAVROIDIS T MAXFIELD SJ MCMAHON SJ MEHTA A MEIER K MERCER D MERZ T MEYER CA MEYER H MEYER J MIKOCKI S MILSTEAD D MOREAU F MORRIS JV MULLER G MULLER K MURIN P NAGOVIZIN V NAHNHAUER R NAROSKA B NAUMANN T NEWMAN PR NEWTON D NEYRET D NGUYEN HK NIEBERGALL F NIEBUHR C NISIUS R NOWAK G NOYES GW NYBERGWERTHER M OBERLACK H OBROCK U OLSSON JE PANARO E PANITCH A PASCAUD C PATEL GD PEPPEL E PEREZ E PHILLIPS JP PICHLER C PITZL D POPE G PRELL S PROSI R RADEL G RAUPACH F REIMER P REINSHAGEN S RIBARICS P RIECH V RIEDLBERGER J RIESS S RIETZ M ROBERTSON SM ROBMANN P ROLOFF HE ROOSEN R ROSENBAUER K ROSTOVTSEV A ROUSE F ROYON C RUTER K RUSAKOV S RYBICKI K RYLKO R SAHLMANN N SANCHEZ E SANKEY DPC SAVITSKY M SCHACHT P SCHIEK S SCHLEPER P VONSCHLIPPE W SCHMIDT C SCHMIDT D SCHMIDT G SCHONING A SCHRODER V SCHUHMANN E SCHWAB B SCHWIND A SEEHAUSEN U SEFKOW F SEIDEL M SELL R SEMENOV A SHEKELYAN V SHEVIAKOV I SHOOSHTARI H SHTARKOV LN SIEGMON G SIEWERT U SIROIS Y SKILLICORN IO SMIRNOV P SMITH JR SOLOVIEV Y SPITZER H STAROSTA R STEENBOCK M STEFFEN P STEINBERG R STELLA B STEPHENS K STIER J STIEWE J STOSSLEIN U STRACHOTA J STRAUMANN U STRUCZINSKI W SUTTON JP TAPPROGGE S TAYLOR RE TCHERNYSHOV V THIEBAUX C THOMPSON G TICHOMIROV I TRUOL P TURNAU J TUTAS J UELKES P USIK A VALKAR S VALKAROVA A VALLEE C VANESCH P VANMECHELEN P VARTAPETIAN A VAZDIK Y VECKO M VERRECCHIA P VILLET G WACKER K WAGENER A WAGENER M WALKER IW WALTHER A WEBER G WEBER M WEGENER D WEGNER A WELLISCH HP WEST LR WILLARD S WINDE M WINTER GG WRIGHT AE WUNSCH E WULFF N YIOU TP ZACEK J ZARBOCK D ZHANG Z ZIMMER M ZIMMERMANN W ZOMER F ZUBER K
Citation
T. Ahmed et al., PHOTOPRODUCTION OF J PSI MESONS AT HERA, Physics letters. Section B, 338(4), 1994, pp. 507-518
Citations number
36
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
338
Issue
4
Year of publication
1994
Pages
507 - 518
Database
ISI
SICI code
0370-2693(1994)338:4<507:POJPMA>2.0.ZU;2-G
Abstract
We present a study of J/psi meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY. The J/psi mesons are detected via their lepton ic decays both to electrons and muons. Requiring exactly two particles in the detector, a cross section of sigma(ep --> J/psiX) = (8.8 +/- 2 .2) nb is determined for 30 GeV less-than-or-equal-to W(gammap) less-t han-or-equal-to 180 GeV and Q2 less-than-or-similar-to 4 GeV2. Using t he flux of quasi-real photons with Q2 less-than-or-similar-to 4 GeV2, a total photoproduction cross section of sigma(gammap --> J/psiX) = (5 6 +/- 13 +/- 14) nb is derived at an average W(gammap) = 90 GeV. The d istribution of the squared momentum transfer t from the proton to the J/psi can be fitted using an exponential exp (-b\t\) elow a \t\ of 0.7 5 GeV2 yielding a slope parameter of b = (4.7 +/- 1.9) GeV-2.