Improved measurement of the form factors in the decay Λc+→ Λe+νe

J. W. Hinson; G. S. Huang; J. Lee; D. H. Miller; V. Pavlunin; R. Rangarajan; B. Sanghi; E. I. Shibata; I. P.J. Shipsey; D. Cronin-Hennessy; C. S. Park; W. Park; J. B. Thayer; E. H. Thorndike; T. E. Coan; Y. S. Gao; F. Liu; R. Stroynowski; M. Artuso; C. Boulahouache; S. Blusk; E. Dambasuren; O. Dorjkhaidav; R. Mountain; H. Muramatsu; R. Nandakumar; T. Skwarnicki; S. Stone; J. C. Wang; S. E. Csorna; I. Danko; G. Bonvicini; D. Cinabro; M. Dubrovin; S. McGee; A. Bornheim; E. Lipeles; S. P. Pappas; A. Shapiro; W. M. Sun; A. J. Weinstein; R. A. Briere; G. P. Chen; T. Ferguson; G. Tatishvili; H. Vogel; M. E. Watkins; N. E. Adam; J. P. Alexander; K. Berkelman

doi:10.1103/PhysRevLett.94.191801

Improved measurement of the form factors in the decay Λc+→ Λe+νe

J. W. Hinson, G. S. Huang, J. Lee, D. H. Miller, V. Pavlunin, R. Rangarajan, B. Sanghi, E. I. Shibata, I. P.J. Shipsey, D. Cronin-Hennessy, C. S. Park, W. Park, J. B. Thayer, E. H. Thorndike, T. E. Coan, Y. S. Gao, F. Liu, R. Stroynowski, M. Artuso, C. BoulahouacheS. Blusk, E. Dambasuren, O. Dorjkhaidav, R. Mountain, H. Muramatsu, R. Nandakumar, T. Skwarnicki, S. Stone, J. C. Wang, S. E. Csorna, I. Danko, G. Bonvicini, D. Cinabro, M. Dubrovin, S. McGee, A. Bornheim, E. Lipeles, S. P. Pappas, A. Shapiro, W. M. Sun, A. J. Weinstein, R. A. Briere, G. P. Chen, T. Ferguson, G. Tatishvili, H. Vogel, M. E. Watkins, N. E. Adam, J. P. Alexander, K. Berkelman

Physics and Astronomy (Twin Cities)

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Abstract

Using the CLEO detector at the Cornell Electron Storage Ring, we have studied the distribution of kinematic variables in the decay Λc+→Λe+νe. By performing a four-dimensional maximum likelihood fit, we determine the form factor ratio, R=f2/f1=-0.31±0. 05(stat)±0.04(syst), the pole mass, Mpole=[2.21±0.08(stat) ±0.14(syst)]GeV/c2, and the decay asymmetry parameter of the Λc+, αΛc=-0.86±0.03(stat)±0.02(syst), forq2=0.67 (GeV/c2)2. We compare the angular distributions of the Λc+ and Λ̄c- and find no evidence for CP violation: AΛc= (αΛc+αΛ̄c)(αΛc- αΛ̄c)=0.00±0.03(stat)±0.01(syst)±0.02, where the third error is from the uncertainty in the world average of the CP-violating parameter, AΛ, for Λ→pπ-.

Original language	English (US)
Article number	191801
Journal	Physical review letters
Volume	94
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.94.191801
State	Published - May 20 2005

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10.1103/PhysRevLett.94.191801

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Hinson, J. W., Huang, G. S., Lee, J., Miller, D. H., Pavlunin, V., Rangarajan, R., Sanghi, B., Shibata, E. I., Shipsey, I. P. J., Cronin-Hennessy, D., Park, C. S., Park, W., Thayer, J. B., Thorndike, E. H., Coan, T. E., Gao, Y. S., Liu, F., Stroynowski, R., Artuso, M., ... Berkelman, K. (2005). Improved measurement of the form factors in the decay Λc+→ Λe+νe. Physical review letters, 94(19), Article 191801. https://doi.org/10.1103/PhysRevLett.94.191801

Hinson, JW, Huang, GS, Lee, J, Miller, DH, Pavlunin, V, Rangarajan, R, Sanghi, B, Shibata, EI, Shipsey, IPJ, Cronin-Hennessy, D, Park, CS, Park, W, Thayer, JB, Thorndike, EH, Coan, TE, Gao, YS, Liu, F, Stroynowski, R, Artuso, M, Boulahouache, C, Blusk, S, Dambasuren, E, Dorjkhaidav, O, Mountain, R, Muramatsu, H, Nandakumar, R, Skwarnicki, T, Stone, S, Wang, JC, Csorna, SE, Danko, I, Bonvicini, G, Cinabro, D, Dubrovin, M, McGee, S, Bornheim, A, Lipeles, E, Pappas, SP, Shapiro, A, Sun, WM, Weinstein, AJ, Briere, RA, Chen, GP, Ferguson, T, Tatishvili, G, Vogel, H, Watkins, ME, Adam, NE, Alexander, JP & Berkelman, K 2005, 'Improved measurement of the form factors in the decay Λc+→ Λe+νe', Physical review letters, vol. 94, no. 19, 191801. https://doi.org/10.1103/PhysRevLett.94.191801

@article{b70535345b9b4bc3a9bb49e1ad388aa1,

title = "Improved measurement of the form factors in the decay Λc+→ Λe+νe",

abstract = "Using the CLEO detector at the Cornell Electron Storage Ring, we have studied the distribution of kinematic variables in the decay Λc+→Λe+νe. By performing a four-dimensional maximum likelihood fit, we determine the form factor ratio, R=f2/f1=-0.31±0. 05(stat)±0.04(syst), the pole mass, Mpole=[2.21±0.08(stat) ±0.14(syst)]GeV/c2, and the decay asymmetry parameter of the Λc+, αΛc=-0.86±0.03(stat)±0.02(syst), forq2=0.67 (GeV/c2)2. We compare the angular distributions of the Λc+ and {\=Λ}c- and find no evidence for CP violation: AΛc= (αΛc+α{\=Λ}c)(αΛc- α{\=Λ}c)=0.00±0.03(stat)±0.01(syst)±0.02, where the third error is from the uncertainty in the world average of the CP-violating parameter, AΛ, for Λ→pπ-.",

author = "Hinson, {J. W.} and Huang, {G. S.} and J. Lee and Miller, {D. H.} and V. Pavlunin and R. Rangarajan and B. Sanghi and Shibata, {E. I.} and Shipsey, {I. P.J.} and D. Cronin-Hennessy and Park, {C. S.} and W. Park and Thayer, {J. B.} and Thorndike, {E. H.} and Coan, {T. E.} and Gao, {Y. S.} and F. Liu and R. Stroynowski and M. Artuso and C. Boulahouache and S. Blusk and E. Dambasuren and O. Dorjkhaidav and R. Mountain and H. Muramatsu and R. Nandakumar and T. Skwarnicki and S. Stone and Wang, {J. C.} and Csorna, {S. E.} and I. Danko and G. Bonvicini and D. Cinabro and M. Dubrovin and S. McGee and A. Bornheim and E. Lipeles and Pappas, {S. P.} and A. Shapiro and Sun, {W. M.} and Weinstein, {A. J.} and Briere, {R. A.} and Chen, {G. P.} and T. Ferguson and G. Tatishvili and H. Vogel and Watkins, {M. E.} and Adam, {N. E.} and Alexander, {J. P.} and K. Berkelman",

year = "2005",

month = may,

day = "20",

doi = "10.1103/PhysRevLett.94.191801",

language = "English (US)",

volume = "94",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "19",

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T1 - Improved measurement of the form factors in the decay Λc+→ Λe+νe

AU - Hinson, J. W.

AU - Huang, G. S.

AU - Lee, J.

AU - Miller, D. H.

AU - Pavlunin, V.

AU - Rangarajan, R.

AU - Sanghi, B.

AU - Shibata, E. I.

AU - Shipsey, I. P.J.

AU - Cronin-Hennessy, D.

AU - Park, C. S.

AU - Park, W.

AU - Thayer, J. B.

AU - Thorndike, E. H.

AU - Coan, T. E.

AU - Gao, Y. S.

AU - Liu, F.

AU - Stroynowski, R.

AU - Artuso, M.

AU - Boulahouache, C.

AU - Blusk, S.

AU - Dambasuren, E.

AU - Dorjkhaidav, O.

AU - Mountain, R.

AU - Muramatsu, H.

AU - Nandakumar, R.

AU - Skwarnicki, T.

AU - Stone, S.

AU - Wang, J. C.

AU - Csorna, S. E.

AU - Danko, I.

AU - Bonvicini, G.

AU - Cinabro, D.

AU - Dubrovin, M.

AU - McGee, S.

AU - Bornheim, A.

AU - Lipeles, E.

AU - Pappas, S. P.

AU - Shapiro, A.

AU - Sun, W. M.

AU - Weinstein, A. J.

AU - Briere, R. A.

AU - Chen, G. P.

AU - Ferguson, T.

AU - Tatishvili, G.

AU - Vogel, H.

AU - Watkins, M. E.

AU - Adam, N. E.

AU - Alexander, J. P.

AU - Berkelman, K.

PY - 2005/5/20

Y1 - 2005/5/20

N2 - Using the CLEO detector at the Cornell Electron Storage Ring, we have studied the distribution of kinematic variables in the decay Λc+→Λe+νe. By performing a four-dimensional maximum likelihood fit, we determine the form factor ratio, R=f2/f1=-0.31±0. 05(stat)±0.04(syst), the pole mass, Mpole=[2.21±0.08(stat) ±0.14(syst)]GeV/c2, and the decay asymmetry parameter of the Λc+, αΛc=-0.86±0.03(stat)±0.02(syst), forq2=0.67 (GeV/c2)2. We compare the angular distributions of the Λc+ and Λ̄c- and find no evidence for CP violation: AΛc= (αΛc+αΛ̄c)(αΛc- αΛ̄c)=0.00±0.03(stat)±0.01(syst)±0.02, where the third error is from the uncertainty in the world average of the CP-violating parameter, AΛ, for Λ→pπ-.

AB - Using the CLEO detector at the Cornell Electron Storage Ring, we have studied the distribution of kinematic variables in the decay Λc+→Λe+νe. By performing a four-dimensional maximum likelihood fit, we determine the form factor ratio, R=f2/f1=-0.31±0. 05(stat)±0.04(syst), the pole mass, Mpole=[2.21±0.08(stat) ±0.14(syst)]GeV/c2, and the decay asymmetry parameter of the Λc+, αΛc=-0.86±0.03(stat)±0.02(syst), forq2=0.67 (GeV/c2)2. We compare the angular distributions of the Λc+ and Λ̄c- and find no evidence for CP violation: AΛc= (αΛc+αΛ̄c)(αΛc- αΛ̄c)=0.00±0.03(stat)±0.01(syst)±0.02, where the third error is from the uncertainty in the world average of the CP-violating parameter, AΛ, for Λ→pπ-.

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DO - 10.1103/PhysRevLett.94.191801

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VL - 94

JO - Physical review letters

JF - Physical review letters

IS - 19

M1 - 191801

ER -

Improved measurement of the form factors in the decay Λc+→ Λe+νe

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