Search for the Z(4430) at BABAR
We report the results of a search for Z(4430){sup -} decay to J/{psi}{pi}{sup -} or {psi}(2S){pi}{sup -} in B{sup -,0} {yields} J/{psi}{pi}{sup -} K{sup 0,+} and B{sup -,0} {yields} {psi}(2S){pi}{sup -}K{sup 0,+} decays. The data were collected with the BABAR detector at the SLAC PEP-II asymmetric-energy e{sup +}e{sup -} collider operating at center of mass energy 10.58 GeV, and the sample corresponds to an integrated luminosity of 413 fb{sup -1}. Each K{pi}{sup -} mass distribution exhibits clear K*(892) and K*{sub 2}(1430) signals, and the efficiency-corrected spectrum is well-described by a superposition of the associated Breit-Wigner intensity distributions, together with an S-wave contribution obtained from the LASS I = 1/2 K{pi}{sup -} scattering amplitude measurements. Each K{pi}{sup -} angular distribution varies significantly in structure with K{pi}{sup -} mass, and is represented in terms of low-order Legendre polynomial moments. We find that each J/{psi}{pi}{sup -} or {psi}(2S){pi}{sup -} mass distribution is well-described by the reflection of the measured K{pi}{sup -} mass and angular distribution structures. We see no significant evidence for a Z(4430){sup -} signal for any of the processes investigated, neither in the total J/{psi}{pi}{sup -} or {psi}(2S){pi}{sup -} mass distribution, nor in the corresponding distributions for the regions of K{pi}{sup -} mass for which observation of the Z(4430){sup -} signal was reported. We obtain branching fraction upper limits {Beta}(B{sup -} {yields} Z{sup -}{bar K}{sup 0}, Z{sup -} {yields} J/{psi}{pi}{sup -}) < 1.5 x 10{sup -5}, {Beta}(B{sup 0} {yields} Z{sup -}K{sup +},Z{sup -} {yields} J/{psi}{pi}{sup -}) < 0.4 x 10{sup -5}, {Beta}(B{sup -} {yields} Z{sup -} {bar K}{sup 0}, Z{sup -} {yields} {psi}(2S){pi}{sup -}) > 4.7 x 10{sup -5}, and {Beta}(B{sup 0} {yields} Z{sup -} K{sup +}, Z{sup -} {yields} {psi}(2S){pi}{sup -}) < 3.1 x 10{sup -5} at 95% confidence level, where the Z(4430){sup -} mass and width have been fixed to be reported central values.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 946080
- Report Number(s):
- SLAC-PUB-13437; arXiv:0811.0564; TRN: US0900856
- Journal Information:
- Physical Review D, Journal Name: Physical Review D
- Country of Publication:
- United States
- Language:
- English
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