/*===================================================================*/ /* NRDF D0232 Data No.2 */ /*===================================================================*/ /* Bibliography */ /*===================================================================*/ \\BIB,2; D#=D232; TITLE=/MEASUREMENT OF POLARIZATION IN ELASTIC PP SCATTERING AT 2.1GEV/C IN THE REGION OF SMALL MOMENTUM TRANSFERS/; PURPOSE=/IT IS OF INTEREST TO MEASURE THE POLARIZATION FOR SMALL 'T' BECAUSE THE BEHAVIOR OF THE POLARIZATION IN THIS REGION GIVES SPECIFIC INFORMATION ON THE AMPLITUDES OF THE SCATTERING MATRIX. THE COULOMB SCATTERING REGION IS ESPECIALLY INTERESTING BECAUSE THAT IS WHERE THE POLARIZATION CAN BE EXPECTED TO BEHAVE IRREGULARY BECAUSE OF INTERFENCE BETWEEN THE ELECTROMAGNETIC AMPLITUDES AND THE STRONG-INTERACTION AMPLITUDES./; ATH=(V.V.ZHURKIN'1',I.M.IVANCHENKO'1,2',V.P.KANAVETS'1', N.N.KARPENKO'1,2',I.I.LEVINTOV'1',V.I.MARTYNOV'1', O.E.MIKHAILOV'1',B.V.MOROZOV'1',V.M.NESTEROV'1',I.I.PERSHIN'1', L.M.POLYAKOVA'1',V.V.RYLTSOV'1',T.S.CHERKALINA'1'); INST-ATH=(4CCPSCU'1',4ZZZDUB'2'); REF=SNP; VLP=28(1978)660; RCTS=(1H(P,P)1H,12C(PIN,PIN)12C); /*===================================================================*/ /* Experimental Conditions */ /*===================================================================*/ \\EXP,2; RCT=12C(PIN,PIN)12C; ACC=(SYN); INST-ACC=4CCPSCU; INC-ENGY-RANGE=(2.1GEV/C); /*@5@*/ DET-PARTCL=(PIN); /*===================================================================*/ /* Descriptive Parameters */ /*===================================================================*/ \\DATA,2; INC-ENGY-RANGE=(2.1GEV/C); /*@5@*/ /*FIG.2-(B)*/ /* D232 FIG 2-(B) */ /* SER#= 2 */ /* XSCALE=LINEAR YSCALE=LINEAR */ /* XMAX= 1.400E+01*0.01 YMAX= 1.100E-01 */ /* XMIN= 0.000E+00 YMIN= 0.000E+00 */ /* FOLLOWING DATA ARE TAKEN FROM GRAPH */ @@12; COMMENT = THIS MEASUREMENT OF THE INSTRUMENTAL ASYMMETRY IN THE ANGU- LAR RANGE OF THE APPARATUS, WHICH WAS 60-180 MRAD, GAVE 0.0029+- 0.0049. @@13; ERR-ANALYSIS = THE BACKGROUND FROM INELASTIC P-P INTERACTIONS RECORD- ED BY THE APPARATUS WAS CALCULATED FOR THE PRINCIPLE BACKGROUND REACTIONS P+P TO P+P+PION0 AND P+P TO P+N+PION+. THE RESULTS OF THE CALCULATION SHOWED THAT THE BACKGROUND OF INELASTIC REACTIONS DEPENDS WEAKLY ON THE SQUARED MOMENTUM TRANSFERS AND IS 7 PERCENT OF THE CROSS SECTION FOR ELASTIC P+P SCATTERING. THE METHOD USED IN THIS EXPERIMENT FOR SELECTING EVENTS CAUSED THE BACKGROUND OF INELASTIC INTERACTIONS TO BE SUPPRESSED BY A FACTOR OF 13. @@14; COMMENT = THE DIFFERENTIAL CROSS SECTIONS IS CLOSELY APPROXIMATED BY THE FORMULA: DSIGMA/DT = A*EXP(-B*T) WITH B=5.97+-0.15(GEV/C)**(- @@15; DATA IS THE MOMENTUM DEPENDENCE OF THE SLOPE (B) OF THE DIFFRACTION PEAK IN THE ELASTIC P-P SCATTERING. @@16; '2' DATA2 = THE SLOPE B, WHERE B IS DEFINED BY DSIGMA/DT = A*EXP(-B*T @@18; DATA IS POLARIZATION ARISING IN THE SCATTERING OF AN UNPOLARIZED ON AN UNPOLARIZED TARGET. @@19; COMMENT = FOR ABS(T) [< 0.5 (GEV/C)**2 THE T-DEPENDENCE OF THE POLAR- IZATION IS APPROXIMATED BY THE EMPIRICAL FORMULA: P(T)=C*SQRT(ABS (T))*EXP(-D*ABS(T)), WITH C=1.3388+-0.106 AND D=2.512+-0.136 (GEV /C)**(-2). IT IS EASY TO SEE THAT THE POSITION OF THE POLARIZATION MAXIMUM T(MAX)=D/2 PRACTICALLY DOES NOT CHANGE IN THE RANGE OF MOMENTA 2 TO 6 GEV/C. @@20; '3' SEE COMMENTS IN FIG.2-(A) AND FIG.2-(B). /*===================================================================*/ /* Data Table */ /*===================================================================*/ \DATA; SQ-MMT DELTA-SQ-MMT DATA1'1' DELTA-DATA1 ((GEV/C)**2) ((GEV/C)**2) (NODIM) (NODIM) 0.0221 5.69E-03 5.25E-03 7.22E-03 0.0358 7.70E-03 6.57E-03 9.85E-03 0.0529 1.03E-02 -2.13E-02 1.18E-02 0.0747 1.20E-02 3.51E-02 1.54E-02 0.0971 1.27E-02 -3.61E-03 1.80E-02 0.1229 1.40E-02 -1.41E-02 1.97E-02 \END; /*===================================================================*/ |