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MEASUREMENT OF THE DIRECT PHOTON SPECTRUM IN Y(1S) DECAYS

Authors

NEMATI B RICHICHI SJ ROSS WR SKUBIC P WOOD M BISHAI M FAST J GERNDT E HINSON JW MENON N MILLER DH SHIBATA EI SHIPSEY IPJ YURKO M GIBBONS L JOHNSON SD KWON Y ROBERTS S THORNDIKE EH JESSOP CP LINGEL K MARSISKE H PERL ML SCHAFFNER SF UGOLINI D WANG R ZHOU X COAN TE FADEYEV V KOROLKOV I MARAVIN Y NARSKY I SHELKOV V STAECK J STROYNOWSKI R VOLOBOUEV I YE J ARTUSO M EFIMOV A FRASCONI F GAO M GOLDBERG M HE D KOPP S MONETI GC MOUNTAIN R MUKHIN Y SCHUH S SKWARNICKI T STONE S VIEHHAUSER G XING X BARTELT J CSORNA SE JAIN V MARKA S FREYBERGER A GIBAUT D GODANG R KINOSHITA K LAI IC POMIANOWSKI P SCHRENK S BONVICINI G CINABRO D GREENE R PERERA LP BARISH B CHADHA M CHAN S EIGEN G MILLER JS OGRADY C SCHMIDTLER M URHEIM J WEINSTEIN AJ WURTHWEIN F ASNER DM BLISS DW BROWER WS MASEK G PAAR HP SIVERTZ M SHARMA V GRONBERG J KUTSCHKE R LANGE DJ MENARY S MORRISON RJ NELSON HN NELSON TK QIAO C RICHMAN JD ROBERTS D RYD A WITHERELL MS BALEST R BEHRENS BH CHO K FORD WT PARK H RANKIN P ROY J SMITH JG ALEXANDER JP BEBEK C BERGER BE BERKELMAN K BLOOM K CASSE DG CHO HA COFFMAN DM CROWCROFT DS DICKSON M DRELL PS ECKLUND KM EHRLICH R ELIA R FOLAND AD GAIDAREV P GALIK RS GITTELMAN B GRAY SW HARTILL DL HELTSLEY BK HOPMAN PI KANDASWAMY J KATAYAMA N KIM PC KREINICK DL LEE T LIU Y LUDWIG GS MASUI J MEVISSEN J MISTRY NB NG CR NORDBERG E OGG M PATTERSON JR PETERSON D RILEY D SOFFER A WARD C ATHANAS M AVERY P JONES CD LONER M PRESCOTT C YANG S YELTON J ZHENG J BRANDENBURG G BRIERE RA GAO YS KIM DYJ WILSON R YAMAMOTO H BROWDER TE LI F LI Y RODRIGUEZ JL BERGFELD T EISENSTEIN BI ERNST I GLADDING GE GOLLIN CD HANS RM JOHNSON E KARLINER I MARSH MA PALMER M SELEN M THALER JJ EDWARDS KW BELLERIVE A JANICEK R MACFARLANE DB MCLEAN KW PATEL PR SADOFF AJ AMMAR R BARINGER P BEAN A BESSON D COPPAGE D DARLING C DAVIS R HANCOCK N KOTOV S KRAVCHENKO I KWAK N ANDERSON S KUBOTA Y LATTERY H ONEILL JJ PATTON S POLING R RIEHLE T SAVINOV V SMITH A ALAM MS ATHAR SB LING Z MAHMOOD AH SEVERINI H TIMM S WAPPLER F ANASTASSOV A BLINOV S DUBOSCQ JE FISHER KD FUJINO D FULTON R GAN KK HART T HONSCHEID K KAGAN H KASS R LEE J SPENCER MB SUNG M UNDRUS A WANKE R WOLF A ZOELLER MR

Citation

B. Nemati et al., MEASUREMENT OF THE DIRECT PHOTON SPECTRUM IN Y(1S) DECAYS, Physical review. D. Particles and fields, 55(9), 1997, pp. 5273-5281

Citations number

Categorie Soggetti

Physics, Particles & Fields

Journal title

Physical review. D. Particles and fields → ACNP

ISSN journal

05562821

Volume

Issue

Year of publication

1997

Pages

5273 - 5281

Database

ISI

SICI code

0556-2821(1997)55:9<5273:MOTDPS>2.0.ZU;2-8

Abstract

Using data taken with the CLEO II detector at the Cornell Electron Sto rage Ring, we have determined the ratio of branching fractions: R-gamm a=Gamma(Upsilon(1S)--> gamma ilon(1S)-->ggg)=[2.75+/-0.04(stat)+/-0.15 (syst)]%. From this ratio, we have determined the QCD scale parameter Lambda(<(MS)over bar>) (defined in the modified minimal subtraction sc heme) to be Lambda(<(MS)over bar>)=233+/-11+/-59 MeV, from which we de termine a value for the strong coupling constant alpha(s)(M-gamma(1S)) =0.163+/-0.002+/-0.014, or alpha(s)(M-Z)=0.110+/-0.001+/-0.007.