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Analysis of - and 0 systems
Vladimir Korotkikh Ludmila Malinina Moscow State University 12 October 2004


E852 experiment

Search of mesons with unusual quantum numbers
-p -p, -p +--p, -p 0n, -p '-p, -p K+K-0 n, ... at 18 GeV/c, AGS (BNL)
E852 date:10.59·106 (1994-95), 8.79·106 (1997-98)- 852 collaboration: BNL, SINP SU, IHEP and 6 USA universities 62 physicists, 12 ­ from MSU 1995-2004


E852 author list of last publications
S.U. Chung, K. Danyo, R.W. Hackenburg, C. Olchanski, J.S. Suh, H.J. Willutzki (Brookhaven), T. Adams, J.M. Bishop, N.M. Cason, E.I. Ivanov, J.M. LoSecco, J.J. Manak, W.D. Shephard, D.L. Stienike, S.A. Taegar (Notre Dame U.), V.A. Bodyagin, A.I. Demianov, A.M. Gribushin, O.L. Kodolova, V.L. Korotkikh, M.A. Kostin, L.V. Malinina, A.I. Ostrovidov, L.I.Sarycheva, N.V. Sinev, I.N. Vardanyan, A.A. Yershov (Moscow State U.),

New E852 member !

S.P. Denisov, V. Dorofeev, V.V., I. Kachaev, V.V. Lipaev, A.V. Popov, D.I. Ryabchikov (Serpukhov, IHEP), Z. Bar-Yam, J.P. Dowd, P. Eugenio, M. Hayek, W. Kern, E. King, N.Shenhav (Massachusetts U., North Dartmouth), D.S. Brown, X.L. Fan, D. Joffe, T.K. Pedlar, K.K. Seth, A.Tomaradze (Northwestern U.), G.S. Adams, J.P. Cummings, J. Hu, J. Kuhn, M. Lu, J. Napolitano, D.B. White, M. Witkowski (Rensselaer Poly.), M. Nozar, X. Shen, D.P. Weygand (Jefferson Lab)


E852 statistics and Exotics JPC=1-+
Publi c ations. Reacti on
1 . D. R. T h o m pso n e t a l . - p - p, Phy s . Re v. Let t . 79( 1997) 163 0 , S . U . C h u n g et al, - p - p, Ph ys . R e v . D 60( 1999) 0 920 0 1 2. G . S . A d a m s et al. "O b s er v a t i on of a N e w J PC = 1+ Ex ot ic S t at e in t h e R e ac t i on - p + - - p at 18 G e V / c " , P h ys . R e v . L e t t . 81( 1 998) 576 0 3. E. Iv a n ov et a l . - p + - p , Ph y s . R e v . Le t t . 86( 200 1) 3977 4 . J . Kuhn e t a l . - p + - - p Ph y s . L e t t . B ., 2003. 5. M . Lu et al. - p 0 - p. Ph ys. R e v . Le t t . 2004. T o be publ i s he d 6. V . L.K o ro tk i k h et al. - p 0 n, + - H A DR O N 99, N u c l .Ph y s . A 6 75( 2 00 0) 413c
0

Fi nal state - 47200 +- - 250000 '- 6040 f1- 68900 b1- 145148 0 18712

Main result 1 (14 00) 1 (16 00) 1 (16 00) 1 (16 00) 1 (20 00) 1 (16 00) 1 (20 00)
M=12 8 0 ± 24 =526 ± 81


1- +
1 (1400)
E852 CrBar CrBar GAMS E852-IU
M, , 1370 385 -

1 (1600)
M, ,

1400 1360 1370 1301 1268 1356

310 220 300 190 670 629

- 0 0 00.14<|t|< 0 0.14<|t|<0.31 0 |t|>0.31
2

2

1593 E852 1597 VES 1610 E852 1709 E852 1664
E852

168 340 290 403 185

- ´

-

- ,´ -,b1

f1- b 1 -

1 (2000)
E852 1280 526 0 , +-0 Korotkikh HADRON2000
E852 E852

2001 333 f1- 2014 230 b1-




-



a) - meson signal and the side bands selected for background b) - - mass distribution in data sample, black region is background




-p -p at 18 GeV/c, 1(1400)
The evidence of resonant nature of P+ wave and the parameters 1(1400), JPC=1-+
14.10.2004


Ambiguous solutions
Three methods : 1. Average of eight solutions (E852)

2. Follow to BW of a0 and a2 famous resonances (E852_IU) 3. Selection of one solution according to Regge model prediction of the ratio R=(D0+D-)/D+ (GAMS)




0


0

n
0 0


D 0 ,D -



b1

(t) = -0.37+ 0.9 t

(t) = 0.57 + 0.91 t D
+


For a2(1320) D+ p - 1 , D0 , D - p - 2 R=(D0+D-)/D+ , R(p) p
-1

p, GeV/c 38. 18.

Regge model 0.4 0.84

GAMS E852-IU
2 2

0.38 ±0.015 0.72 ± 0.12


GAMS ,S.A.Sadovsky, Nucl. Phys. A655(1999) 131c

-p 0n

at 38 GeV/c, GAMS Regge model extrapolation R p - 1 At 38 GeV/c R0.4

R=(D0+D-)/D

+

GAMS: 1. R = 0.38 ± 0.15 for one solution among eight 2. For this solution R is maximum !!! Rule of selection


a0(1320) ? !

-p

After selection of the physical solution: 0n at 38 GeV/c, GAMS


0

n
0

0 a 0,M=0

If we see a0(980) , why we don't see a0 (1320) in E852 data?


GAMS , -p 0n 1(1400), JPC=1-+
GAMS claims M=1370 MeV (fixed from BNL data 1- ) =300±125 MeV
S.A.Sadovsky, Nucl. Phys. A655(1999) 131c


-p -p 18 /c
Experimental data and analysis are published in S.U. Chung et al (E852), Phys. Rev. D60(2001)092001

Lets calculate R=(D0+D-)/D+


NPE waves


UNPE waves


R=(D0+D-)/D Large scale

+

Small scale

For charge system



- the ratio is R 0

f2 reggion exchange is dominated


V.L. Korotkikh, BNL note , 1998 "t-dependence of a2 production ..."

Points are E852 data for a2 region

Regge parameters from E.J. Sacharidis, Lett. Nuov.Cim. 24(1979)193


, 2 (39.4%)
0
A.R.Dzierba et al. -p0n, 2, Phys. Rev. D67(2003))094015
45000 events


A.R.Dzierba et al. -p0n, 2 PWA, low |t|
MDFit of H(LM)


A.R.Dzierba et al. -p0n, 2 PWA+MDFit


Table of the P+ bump parameters A.R.Dzierba et al. -p0n, 2, Phys.Rev. D67(2003))094015

Ma2 a2 MX
X

2

all |t| 1.326 ±0.0023 0.169 ±0.0069 1.272 ±0.017 0.66 ±0.048 3.23

low-|t| 1.316 ±0.0049 0.127 ±0.014 1.301 ±0.014 0.19 ±0.032 2.13

medium-|t| 1.329 ±0.0029 0.154 ±0.0082 1.268 ±0.023 0.67 ±0.087 1.51

high-|t| 1.326 ±0.0036 0.166 ±0.01 1.356 ±0.021 0.629 ±0.064 1.60


1(1400)

A.R.Dzierba et al. -p0n, 2 Comparison


A.R.Dzierba et al. -p0n, 2 t'-dependence

R = 0.72 ± 0.12 It is obvious that R=(D0+D-)/D+ depends on t' cuts by the acceptance


For a2(1320) D+ p - 1 , D0 , D - p - 2 R=(D0+D-)/D+ , R(p) p
-1

p, GeV/c 38. 18.

Regge model 0.4 0.84

GAMS E852-IU
2 2

0.38 ±0.015 0.72 ± 0.12


A.R.Dzierba et al. -p0n, 2 Leakage study


Mine criticism on IU results of

0

1. There is not the point of interaction in analysis 2. Selection of physical solution is not complete 3. Leakage study is made without the beam smearing




E852 statistics and Exotics JPC=1-+
Publications. Reaction
1. D . R . Th o m p s on et al. - p - p, Ph y s . R e v . Le t t . 79( 1997) 163 0, S . U . C h u n g et al, - p - p, P h ys . R e v . D 6 0( 1999) 0920 0 1 2. G . S . A d a m s et al. "O b s er v a t i on of a N e w J PC = 1+ Ex o t ic S t at e in t h e R e a c t i on - p + - - p at 18 G e V / c", P h ys . R e v . Le t t . 81( 1998) 576 0 3. E. I v a n ov et al. - p + - p , Ph ys. R e v . Le t t . 86( 200 1) 3977 4. J. K u h n e t al. - p + - - p Ph ys. Let t . B., 2003. 5. M. Lu et al. - p 0 - p. P h ys . R e v . Le t t . 2004. T o be publ i s he d 6. V . L.K o rot k i k h et al. - p 0 n, + - , H AD RON9 9 , Nuc l . P hy s . A6 7 5 ( 2 0 00 )4 1 3 c
0

Final state - 47200 +- - 250000 '- 6040 f1- 68900 b1- 145148 0 18712 0 45000

Main resu lt 1 (14 00) 1 (16 00) 1 (16 00) 1 (16 00) 1 (2 0 0 0) 1 (16 00) 1 (20 00)
M= 128 0 ± 24 =526 ± 81

7 . A. R. Dz i e r b a e t a l . - p 0 n, 2 , Ph ys.R ev . D 67( 2003) ) 0940 15

M= 127 2 ± 17 =660 ± 48

All | t |


, +- (28 %)
0

0

V.L.Korotkikh et al.(E852) -p0n, +-0 HADRON99, Nucl. Phys. A675(2000)413c


Onn-line selection * * * * Interaction beam Two downstream tracks No recoil trac LGD trigger processor mass > 0 mass Trigger: 0-2-2-(4) 0

Off-line selection * * * * * * * Reconstructed beam No recoil CsI < 160 MeV Two forward reconstructed tracks Vertex in target Exactly 4 photons Kinematical fit selecting events consistent with (n, , 0)


Statistics. Data cuts.
Total 0-2-2-X triggers analyzed 108,000,000

Trigger: 0-2-2-(4) 0

After skimming data 0-2-2-4Photons 6,000,000 ----------------------------------------------------------------------------------------1.1. Hypothesis EtaPi0,(cl>0.01) 41,108 (36,475) 1.1.1. Hypothesis EtaPi0,(ellips cut+cl>0.01) 26,871 ----------------------------------------------------------------------------------------1.2. Hypothesis EtaPi0,(cl>0.10) 41,108 (20,674) 1.2.1. Hypothesis EtaPi0,(ellips cut, cl>0.10) 18,712 ---------------------------------------------------------------------------------------1.1.MC. EtaPi0, Raw Monte Carlo Events 900,424 ---------------------------------------------------------------------------------------1.1.MC. EtaPi0, Acc MC Events,(after SQUAW) 265,972 1.1.MC. EtaPi0, Acc MC Events,(ellips cut) 1.1.1.MC. EtaPi0, Acc MC Events,(ellips cut, cl>0.01) 1.2.1.MC. EtaPi0, Acc MC Events,(ellips cut, cl>0.10) 196,560 192,302 180,294 PWA PWA PWA


Set waves


NPE waves

cl > 0.10 18712 data 180294 acc 900000 raw

PWA mass bin= 40 MeV


UNPE waves


Mass dependent fit of 0 1. Two BW 2. Average of amb. solutions

The same as in analysis of -


V.L.Korotkikh et al.(E852) HADRON 99, Nucl.Phys. A675(2000)413c


E852 statistics and Exotics JPC=1-+
Publications. R eaction
1. D . R . Th o m p s on et al. - p - p, Ph y s . R e v . Let t . 79( 1997) 163 0, S . U . C h u n g et al, - p - p, P h ys . R e v . D 60( 1999) 0920 0 1 2. G . S . A d a m s et al. "O b s er v a t i on of a N e w J PC = 1+ Ex ot ic St at e in t h e R e action - p + - - p at 18 G e V / c", P h ys . R e v . Le t t . 81( 1998) 576 0 3. E. I v an ov et al. - p + - p , Ph ys. R e v . Le t t . 86( 200 1) 3977 4 . J . Kuhn e t a l . - p + - - p Ph ys. Let t . B., 2003. 5. M . Lu et a l . - p 0 - p. P h ys . R e v . Le t t . 2004. T o be publ i s he d 6. V . L.K o rotk i k h et al. - p 0 n, + - , H A D R O N 99, N u cl.P h y s . A 6 75( 200 0) 413c
0

Final state - 47200 +- - 250000 '- 6040 f1- 68900 b1- 145148 0 18712 0 45000

Main result 1 (14 00) 1 (16 00) 1 (16 00) 1 (16 00) 1 (20 0 0) 1 (16 00) 1 (20 00)
M=128 0 ± 24 =526 ± 81

7 . A. R. Dz i e r b a e t a l . - p 0 n, 2 , Ph ys.R ev . D 67( 2003) ) 0940 15

M=127 2 ± 17 =660 ± 48

A l l |t |


0, +- 0 Leakage study 1. Only D+ wave 2. Whole chain to get acceptance events 3. PWA
green ­ input data black ­ PWA results

There is no the beam smearing


Leakage study


Mass dependent PWA of 0 1. Simultaneous fit of angular and mass distributions 2. Free BW parameters and leakage

A) Leakage = 0 and fixed

red ­ BW of P+ wave

M=1250 ± 7 =386 ± 10


Mass dependent PWA of 0 1. Simultaneous fit of angular and mass distributions 2. Free BW parameters and leakage
blue ­ leakage red ­ BW contribution

B) Leakage is free ??? !

M=1118 ± 21 =477 ± 32

We can't make the free leakage, but there is problem !!!


Lets calculate R=(D0+D-)/D+ for 0, +- 0 The source of ambiguous solutions is UNP waves. So we need to work with them in order to select the physical solution


For a2(1320) D+ p - 1 , D0 , D - p - 2 R=(D0+D-)/D+ , R(p) p
-1

p, GeV/c 38. 18.

Regge model 0.4 0.84

GAMS
2

E852-IU
2

E852
+-
0

0.38 ±0.015 0.72 ± 0.12 ?


0, +- 0

One solution


0, +- 0

Ambiguous solution

RModel


0, +- 0

Ambiguous solution

RModel


Why
1. R is small ? It depends on t­ acceptance cut 2. R jumps up and down ? Small statistic.


Why
1 (1400) and not ´ 1 (1600)´ and not


S.U. Chung, E.Klempt, J.G.Korner, Eur.Phys.J.A15(2002)539

In the limit of flavor SU(3) conservation and by the requirement of Bose symmetrization

, {Octet}8 If {X}8 {}8 +{}8 , then X = + X=1 (1400)[]­ , L=1, X = - So 1 (1400) is not {Octet}8 , not Hybrid !! 1(1600) may be {Octet}8 , {X}8 {'}1 +{}
8


Experimental results and interpretation

1

-+

X

X´

Interpretation

1 (1400) 1 (1600)

+ -

- +

Decuplet {4q}

Hybrid


S.U. Chung, E.Klempt, J.G.Korner, Eur.Phys.J.A15(2002)539 S.U. Chung , E.Klempt, Phys.Lett. B563(2003)83 SU(3) Decomposition 8 8 = 27 10 10 81 82 1 Multiplet Singlet (1) Symm.Octet(81) Antisym.Octet(82) Multiplet 17(10+ 10) Multiplet 17(10-10) Multiplet 27 JPC even even even
++ ++ --

Composition qq , Hybrid, 4q qq , Hybrid, 4q qq , Hybrid, 4q 4q, X(=+1), X'(=-1) 4q ,X(=+1), X'(=-1) 4q

odd - + odd - - even ++


S.U. Chung , E.Klempt, Phys.Lett. B563(2003)83 Nonstrange decays of multiplets X and X' JPC 1 1
-+ -+

[{a},{b}]

Decays
8

X(=+1) [{a},{b}]+ []8, [] X'(=-1) [{a},{b}]- , b1

1 (1400) 1'(1400)


If 1- + bump (0 ) is a true resonant state, then how to understand the different resonant masses in (- ) and (0 ) systems ? JPC 1 1
-+ -+

Production

Exchange by f2 , b1

Mass, MeV 1370 1280

Question Mass difference of X and X' ?

-p - p -p 0 n


My comments on

0, +- 0

1. 2. 3. 4. 5.

We have the good selection events There is coincidence of IU and V.L. results for all t There is the leakage problem Selection of the physical solution Watson phase for UNP wave and new PWA


Comments
Continuation of 0 analysis · · · · Estimation of leakage with beam smearing Why don't we see a0(1320) in E852 as in GAMS Selection of the physical solution Exotic JPC=1-+ in 0 : 1(1400) or 1'(1400)


Outside slides


Goodness of fit

0


Goodness of fit