Baryons, S=−2

~88

Data Card Listings

Baryons E(3000), EXOTIC HYPERONS, E-, E O, ~(1530)

For notation, see ke~ at.front of Listings. I=1/2

S=-2 59 Pl P2

Y*i(300O}

Y*II30001

DECAY MASSES 497~ 939 I L L S ÷ 139

INTO KBAR N

Y*I(3OOO]INTO

STATES (Z)

HYPERON

PARTIAL DECAY MODES (PROD. EXP.I

LAMBOA PI

t*****

t=*****t=

t$t*t~t*t

= t**h*

t*$

22

Xl-

t=tt**tt*

(13211

JR=l/2

t*t*$t=**

}

~*tttt=**

tt*=t*tt

I=1/2

SEE STABLE PARTICLE DATA CARD LISTINGS REFERENCES FOR Y * I i 3 0 O O ( EHRLICH

66 PR 152 1194

(PROD. E X P . }

R EHRLICH, N SELOVE~ H YUTA

****** ********* * * * * * * * * *

*********

*********

(PENNiBNL})

I

********* *,******

*********

F

~

23

EXOTIC HYPERON CROSS SECTION THIS IS NOT A COMPLETE LIST. ONLY F~D~ tgTO ON.

CS CS CS CS CS

HE TABULATE

I"""I i

UNITS MICROBARNS G (20o} OR G ABOVE LIMIT FOR A [4Ool OR A ABOVE LIMIT FOR

LESS MASS < LESS MASS <

GALTIERI

68 DBC

K-N TO SG-PI-RIO K-) GALTIERI 68 DBC - - K-N TO SG-PI-PIO 2.3 GEV AND GAMMA < 120 MEV- (2.7 GEV/C K-) 2 . 1 5 GEV AND GAMMA <

b O M E V - (2.1GEV/C

7/70 7/70 7170 7170

-

-

i

12(153o)I

60

XI.1/2(1530,

A.BARBARC-GALTIERI,CHADWICK +

TH is THE . . . . . . . . . . . . . . . . STABLISHED XI . . . . . QUANTUM NUMBERS 3/2+ ARE FAVORED BY THE DATA.

WE DO NOT USE DETERMINATIONS OF THE MASS AND THE WIDTH OF THIS STATE UNLESS THEY ~RE ACCOMPANIED BY SOME DISCUSSION DF SYSTEMATICS AND RESOLUTION.

(LRL+SLAE)

...................................

xI*112(IE30)

49 M

55|1529,0)

M M-

(1532.O}

MASS (MEV}

The ~

resonance

will probably

long

situation h a s long b e e n a n d

r e m a i n unsettled.

This is be-

cause t) t h e y c a n o n l y b e p r o d u c e d a s p a r t of a

final state,

N-+p ~*

+ others,

p r o d u c e d with v e r y s m a l l c r o s s T h u s the n u m b e r s

and Z) t h e y a r e s o

FJERROU

(2.0}

BAOIER

64 HBC

-0 K-R 3 GEV/C

LONDON BALTAY KIRSCH

66 HBC 75 HBC 72 HBC

-

ROSS2

73

38 1 3 3 5 . 7 3.2 334 1536o7 1.1 185 1 5 3 6 , 2 1.6 N1535*3 2,0 M• . . . . . . . . ~_ 69G 1535.8 1.5 FIT 1535o05 0.62 NO 76 1 5 2 8 . 7 1.t MO 59 1 5 3 1 . 4 0.8 NO 1262 1 5 3 2 . 0 0.4 MO 326 1 5 3 1 ° 3 0.6 MO 286 1 5 3 2 , 3 0.7 MO 1533.0 L.O MO . . . . . . . . . MO AVO 1531*72 0,39 MO F I T 1531.66 0.35

s e c t i o n s ( <50 ~b).

of events available are small,

and the a n a l y s i s i s m o r e c o m p l i c a t e d than if d i r e c t Only the ~ (t530) is

formation w e r e possible.

really well established. states in the 1 8 0 0 - 2 0 0 0

above

the situation is v e r y u n c l e a r . together

await

new

rather

results.

The

a r e f o r c e d to

observations

in the

among

R

O D

AVG FIT

2.7

I*0

2°52 3,41

0.91 0.61

various

listings

and point

experiments.

49 wo WO WO NO WO wo

NO wo WD NO AVO

7.0 T.O 8,5 11.0 9.0 8o6

status

ger

data

of the

-~ r e s o n a n c e s ,

available

at this

-

K-P 2 , 2 4 GEV/C K-P 1 . 7 5 GEV K-P 2,87GEV/C

7/66 1/73 2/75

Xl KBAR El (El)

2176"

(ERROR INCLUOES SCALE FACTOR OF 1 . 0 } LONDON 66 HBC 0 K-P 2 . 2 4 GEV/C BAOIER 72 HBC 0 K-R AT 3oOSGEV/C BALTAY 72 HBD 0 K-P 1 , 7 5 GEV BORENSTEI 72 HBC 0 K-F 2.2GEV/C KIRSCH 72 HBC 0 K-P 2.87GEV/C ROSS2 73 x l KBAR P I | E l i

7/60 10171 1/73

2/72 2/72 2/7~*

(XI~O) MASS DIFFERENCE tREY) PJERROU LONDON MERRILL

65 HBC 66 HBC 66 HBC

-0 -0 -0

t.8-1.95 GEV/C 2 . 2 4 GEV/C 1 . 7 - 2 . 7 GEV/C

7/66 7/66 7/66

BALTAY

72 HBC

-0 K-P 1.75 GEV

1173

KIRSCH

72 ~;BC

-0

2/72

K - P 2 . 8 GEV/C

AVERAGE(ERROR INCLUDES SCALE FACTOR OF [.O) FROMFIT (ERROR INCLUDES SCALE FACTOR OF 1.Of

based

on the

XI*l/2(1530) 2.0 7,0 3.5 2.0 0.7 1.4

WIDTH IMEVI SCHLEIN SERGE LONDON BAOIER BALTAY BORENSTEI

11.0 l,B 9.1 2.4 . . . . . . . . . 9.07 0°52

63 66 66 72 72 72 75

RIRSCH ROSS2

HBC HBC HBC HBC HBC HBC

0 0 O 0 O 0

HBC

0 XI- El+ XI KBAR Pl ( E l l

73

l,B, 1 . 9 5 GEV/C l.S-1,7 GEV/C 2 . 2 4 GEV/C K-P AT 3.95GEV/C K-P 1 . 7 5 GEV X I - P I + MODE

7166 7/66 10/71 1/73 2/72

AVERAGE(ERROR INCLUDES SCALE FACTOR OF l . O )

(SEE IDEOGRAM BELOW )

table f o l l o w i n g this note g i v e s o u r e v a l u a t i o n of

the

K-P 1 . B GEV/C

AVERAGE (ERROR INCLUDES SCALE FACTOR OF 1o5} FROM F I T (ERROR INCLUDES SCALE FACTOR OR 1.3}

(3.9} It.El . . . . . . . . .

but

Z000 1~eV,

We

disparate Figures

out d i s a g r e e m e n t s

0 O

3,0 (4.0I 3.2

-0

AVERAGE IER~DR INCLUDES SCALE FACTOR OF 1.0I FROM F I T

|x1=-I -

5.7 (7.0) 2.0

HBD

region and there are

indications of s e v e r a l m o r e

group

R

D

T h e r e are at least two MeV

40 O D D

62

15.O)

N-* M-

Resonances

IP131

I=i/2

JP=3/2+}

.................................

REFERENCES FOR EXOTIC HYPERONS

GALTIERI 68 PRL 21 573

xIo t1314, JP=ll2 I I=112

SEE STABLE PARTICLE DATA CARD LISTINGS

mea-

WEIBHTED

RUERRBE

ERROR

time.

=

SCALED

9.07 BY

±

0,$2

i.O

STATUS OF XI* RESONANCES THOSE WITH AN OVERALL STATUS DF *** OR **** ARE INCLUDED IN THE MAIN BARYON

TABLE. THE OTHERS AWAIT CONFIRMATION. STATUS AS SEEN IN - ..................................

OVERALL PARTICLE t I J STATUS X( Pl LAMK .....................................................................

SIG K

X l WWP I

OTHER CHANNELS

.CHISQ XI(13201

Pll

Xl11530I PI3 XI{1630) xI11820} x II 19401

x112030) XII2250I XI (2500)

*~'**

**** **

*** *** *t~ *

WEAK TO tAN P I

**** **

***

***

**

*** ~,*

** **

$~

~

...............................................

~

***

***

.

. . . . . . . .

$$~ •$

•

GOOD, CLEAR, AND UNMISTAKABLE, GO00, B~T IN NEED OF CLARIFICA'~ION

.KIRSCH

HBC

1.2

?2

HBC

0.2

.....

BALTAY

?2

HBC

0.0

.....

BADIER

72

HBC

0.9

.....

LONDON

66

HBC

0.0

BERGE

66

HBC

63

HBC

.....

ABSOLUTELY CERTAIN.

CHLEIN

i,i 3,4

NEEDS CONFIRMATION. WEAK.

....................................................................

0.0

?2

BOREHSTEI

3-BODY D E C A Y S 3-BODY DECAYS - ......................

OR NO7

73

3-BODY DECAYS

.... • ~'~,~,

•ROSS2

S XIml/2(1530)O

I0 WIDTH

IS (MEU)

20

(CONLEU =O.?SS)

2172 2176"