We present the present status of the E877 studies of anisotropic transverse flow at the AGS energy. Flow is quantified by Fourier analysis of the azimuthal distributions of transverse energy and charged particle multiplicity. Additionally, the mean transverse momentum of identified particle spectra with respect to the reaction plane are measured near the beam rapidity. Analysis shows the presence of nucleon flow at AGS energies and a small pion flow in the direction opposite to that of the nucleon.
Bibliographical noteFunding Information:
Measuremenotsf flow in AGS Au+Au collisionsh avei dentifieda directedfl ow compo-nenti n thet ransverseen ergya ndc hargepd articled istributionosf m id-centralictyo llisions. The anisotropiyn transverseen ergyp roductionis largert hanthat for chargedp articles. The latterd ifferenchea sb eenu sedt o disentanglteh ec ontributiontso the measure\d]l ow from nucleonsa nd pions. It is found that the nucleonsa re the primarys ourceo f the flow signala ndthat pionse xhibita smallefrl ow whichi s directedo ppositeto that of the nucleons. Triple differentiaclr osss ectionso f identifiedp articlep roductionh aveb eenm easured. Identifiedp rotonsa nd pions nearb eamr apidityv erifyt her esultsf romthe calorimeter; namelyt hatn ucleonps rimarilyc arryt heftow and chargedp ionso f both signse xhibita smallerfl ow directedo ppositeto the protons. RQMD predictionrsu n in cascadem odef ail to reproducteh edata. Calculationuss ing meanf ieldsm aybring the predictionisn to agreementA.R C calculationrse quirep urely repulsivetr ajectorieast low ECM to accounfto r the data. Financiasl upporftr omt heUS DoE, the NSF, the CanadianN SERC, and CNPq Brazil are gratefullya cknowledged.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics