Dalitz plot analysis of the decay D(+)-->K(-)pi(+)pi(+) and indication of a low-mass scalar Kpi resonance.
We study the Dalitz plot of the decay D(+)-->K(-)pi(+)pi(+) with a sample of 15090 events from Fermilab experiment E791. Modeling the decay amplitude as the coherent sum of known Kpi resonances and a uniform nonresonant term, we do not obtain an acceptable fit. If we allow the mass and width of the K(*)(0)(1430) to float, we obtain values consistent with those from PDG but the chi(2) per degree of freedom of the fit is still unsatisfactory. A good fit is found when we allow for the presence of an additional scalar resonance, with mass 797+/-19+/-43 MeV/c(2) and width 410+/-43+/-87 MeV/c(2). The mass and width of the K(*)(0)(1430) become 1459+/-7+/-5 MeV/c(2) and 175+/-12+/-12 MeV/c(2), respectively. Our results provide new information on the scalar sector in hadron spectroscopy.
Aitala
E M
EM
University of Mississippi-Oxford, University, Mississippi 38677, USA.
Amato
S
S
Anjos
J C
JC
Appel
J A
JA
Ashery
D
D
Banerjee
S
S
Bediaga
I
I
Blaylock
G
G
Bracker
S B
SB
Burchat
P R
PR
Burnstein
R A
RA
Carter
T
T
Carvalho
H S
HS
Copty
N K
NK
Cremaldi
L M
LM
Darling
C
C
Denisenko
K
K
Devmal
S
S
Fernandez
A
A
Fox
G F
GF
Gagnon
P
P
Göbel
C
C
Gounder
K
K
Halling
A M
AM
Herrera
G
G
Hurvits
G
G
James
C
C
Kasper
P A
PA
Kwan
S
S
Langs
D C
DC
Leslie
J
J
Lundberg
B
B
Magnin
J
J
Massafferri
A
A
MayTal-Beck
S
S
Meadows
B
B
de Mello Neto
J R T
JR
Mihalcea
D
D
Milburn
R H
RH
de Miranda
J M
JM
Napier
A
A
Nguyen
A
A
d'Oliveira
A B
AB
O'Shaughnessy
K
K
Peng
K C
KC
Perera
L P
LP
Purohit
M V
MV
Quinn
B
B
Radeztsky
S
S
Rafatian
A
A
Reay
N W
NW
Reidy
J J
JJ
dos Reis
A C
AC
Rubin
H A
HA
Sanders
D A
DA
Santha
A K S
AK
Santoro
A F S
AF
Schwartz
A J
AJ
Sheaff
M
M
Sidwell
R A
RA
Slaughter
A J
AJ
Sokoloff
M D
MD
Solano  Salinas
C J
CJ
Stanton
N R
NR
Stefanski
R J
RJ
Stenson
K
K
Summers
D J
DJ
Takach
S
S
Thorne
K
K
Tripathi
A K
AK
Watanabe
S
S
Weiss-Babai
R
R
Wiener
J
J
Witchey
N
N
Wolin
E
E
Yang
S M
SM
Yi
D
D
Yoshida
S
S
Zaliznyak
R
R
Zhang
C
C