Improved measurement of the form factors in the decay Λc+ → Λe+νe -: art. no. 191801

被引：26

作者：

Hinson, JW ^{[1
]}

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

机构：

[1] Purdue Univ, W Lafayette, IN 47907 USA

[2] Univ Rochester, Rochester, NY 14627 USA

[3] So Methodist Univ, Dallas, TX 75275 USA

[4] Syracuse Univ, Syracuse, NY 13244 USA

[5] Vanderbilt Univ, Nashville, TN 37235 USA

[6] Wayne State Univ, Detroit, MI 48202 USA

[7] CALTECH, Pasadena, CA 91125 USA

[8] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[9] Cornell Univ, Ithaca, NY 14853 USA

[10] Univ Florida, Gainesville, FL 32611 USA

[11] Univ Illinois, Urbana, IL 61801 USA

[12] Carleton Univ, Ottawa, ON K1S 5B6, Canada

[13] Univ Kansas, Lawrence, KS 66045 USA

[14] Univ Minnesota, Minneapolis, MN 55455 USA

[15] Northwestern Univ, Evanston, IL 60208 USA

[16] SUNY Albany, Albany, NY 12222 USA

[17] Ohio State Univ, Columbus, OH 43210 USA

[18] Univ Oklahoma, Norman, OK 73019 USA

[19] Univ Pittsburgh, Pittsburgh, PA 15260 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.94.191801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using the CLEO detector at the Cornell Electron Storage Ring, we have studied the distribution of kinematic variables in the decay Lambda(c)(+)->Lambda e(+)nu(e). By performing a four-dimensional maximum likelihood fit, we determine the form factor ratio, R=f(2)/f(1)=-0.31 +/- 0.05(stat)+/- 0.04(syst), the pole mass, M-pole=[2.21 +/- 0.08(stat)+/- 0.14(syst)] GeV/c(2), and the decay asymmetry parameter of the Lambda(c)(+), alpha(Lambda c)=-0.86 +/- 0.03(stat)+/- 0.02(syst), for < q(2)>=0.67 (GeV/c(2))(2). We compare the angular distributions of the Lambda(c)(+) and (Lambda) over bar (-)(c) and find no evidence for CP violation: A(Lambda c)=(alpha(Lambda c)+alpha((Lambda) over barc))/(alpha(Lambda c)-alpha((Lambda) over barc))=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, A(Lambda), for Lambda -> p pi(-).

引用

页数：5

共 24 条

[1] FIRST OBSERVATION OF THE DECAY XI(+)(C)-]XI(0)E+NU(E) AND AN ESTIMATE OF THE XI(+)(C)/XI(0)(C) LIFETIME RATIO [J].

ALEXANDER, JP ;

BEBEK, C ;

BERKELMAN, K ;

BLOOM, K ;

BROWDER, TE ;

CASSEL, DG ;

CHO, HA ;

COFFMAN, DM ;

CROWCROFT, DS ;

DRELL, PS ;

DUMAS, D ;

EHRLICH, R ;

GAIDAREV, P ;

GARCIASCIVERES, M ;

GEISER, B ;

GITTELMAN, B ;

GRAY, SW ;

HARTILL, DL ;

HELTSLEY, BK ;

HENDERSON, S ;

JONES, CD ;

JONES, SL ;

KANDASWAMY, J ;

KATAYAMA, N ;

KIM, PC ;

KREINICK, DL ;

LUDWIG, GS ;

MASUI, J ;

MEVISSEN, J ;

MISTRY, NB ;

NG, CR ;

NORDBERG, E ;

PATTERSON, JR ;

PETERSON, D ;

RILEY, D ;

SALMAN, S ;

SAPPER, M ;

WURTHWEIN, F ;

AVERY, P ;

FREYBERGER, A ;

RODRIGUEZ, J ;

YANG, S ;

YELTON, J ;

CINABRO, D ;

LIU, T ;

SAULNIER, H ;

WILSON, R ;

YAMAMOTO, H ;

BERGFELD, T ;

EISENSTEIN, BI .

PHYSICAL REVIEW LETTERS, 1995, 74 (16) :3113-3117

[2] RADIATIVE-CORRECTIONS AND SEMILEPTONIC B-DECAYS [J].

ATWOOD, D ;

MARCIANO, WJ .

PHYSICAL REVIEW D, 1990, 41 (05) :1736-1740

[3] PHOTOS - A UNIVERSAL MONTE-CARLO FOR QED RADIATIVE-CORRECTIONS - VERSION 2.0 [J].

BARBERIO, E ;

WAS, Z .

COMPUTER PHYSICS COMMUNICATIONS, 1994, 79 (02) :291-308

[4] STUDY OF THE DECAY LAMBDA(C+)-]LAMBDA-L+NU(L) [J].

BERGFELD, T ;

EISENSTEIN, BI ;

GOLLIN, G ;

ONG, B ;

PALMER, M ;

SELEN, M ;

THALER, JJ ;

SADOFF, AJ ;

AMMAR, R ;

BALL, S ;

BARINGER, P ;

BEAN, A ;

BESSON, D ;

COPPAGE, D ;

COPTY, N ;

DAVIS, R ;

HANCOCK, N ;

KELLY, M ;

KWAK, N ;

LAM, H ;

KUBOTA, Y ;

LATTERY, M ;

NELSON, JK ;

PATTON, S ;

PERTICONE, D ;

POLING, R ;

SAVINOV, V ;

SCHRENK, S ;

WANG, R ;

ALAM, MS ;

KIM, IJ ;

NEMATI, B ;

ONEILL, JJ ;

SEVERINI, H ;

SUN, CR ;

ZOELLER, MM ;

CRAWFORD, G ;

DAUBENMIER, CM ;

FULTON, R ;

FUJINO, D ;

GAN, KK ;

HONSCHEID, K ;

KAGAN, H ;

KASS, R ;

LEE, J ;

MALCHOW, R ;

MORROW, F ;

SKOVPEN, Y ;

SUNG, M ;

WHITE, C .

PHYSICS LETTERS B, 1994, 323 (02) :219-226

[5]

BRUN R, 1987, DDEE841 CERN

[6] FORM-FACTOR RATIO MEASUREMENT IN LAMBDA(+)(C)-]LAMBDA-E(+)NU(E) [J].

CRAWFORD, G ;

DAUBENMIER, CM ;

FULTON, R ;

FUJINO, D ;

GAN, KK ;

HONSCHEID, K ;

KAGAN, H ;

KASS, R ;

LEE, J ;

SUNG, M ;

WHITE, C ;

WOLF, A ;

ZOELLER, MM ;

BUTLER, F ;

FU, X ;

NEMATI, B ;

ROSS, WR ;

SKUBIC, P ;

WOOD, M ;

BISHAI, M ;

FAST, J ;

GERNDT, E ;

HINSON, JW ;

MCILWAIN, RL ;

MIAO, T ;

MILLER, DH ;

MODESITT, M ;

PAYNE, D ;

SHIBATA, EI ;

SHIPSEY, IPJ ;

WANG, PN ;

BATTLE, M ;

ERNST, J ;

GIBBONS, L ;

KWON, Y ;

ROBERTS, S ;

THORNDIKE, EH ;

WANG, CH ;

DOMINICK, J ;

LAMBRECHT, M ;

SANGHERA, S ;

SHELKOV, V ;

SKWARNICKI, T ;

STROYNOWSKI, R ;

VOLOBOUEV, I ;

WEI, G ;

ZADOROZHNY, P ;

ARTUSO, M ;

GAO, M ;

GOLDBERG, M .

PHYSICAL REVIEW LETTERS, 1995, 75 (04) :624-628

[7] SIGNALS OF CP NONCONSERVATION IN HYPERON DECAY [J].

DONOGHUE, JF ;

PAKVASA, S .

PHYSICAL REVIEW LETTERS, 1985, 55 (02) :162-165

[8] AN EFFECTIVE FIELD-THEORY FOR THE CALCULATION OF MATRIX-ELEMENTS INVOLVING HEAVY QUARKS [J].

EICHTEN, E ;

HILL, B .

PHYSICS LETTERS B, 1990, 234 (04) :511-516

[9] Review of particle physics [J].

Eidelman, S ;

Hayes, KG ;

Olive, KA ;

Aguilar-Benitez, M ;

Amsler, C ;

Asner, D ;

Babu, KS ;

Barnett, RM ;

Beringer, J ;

Burchat, PR ;

Carone, CD ;

Caso, C ;

Conforto, G ;

Dahl, O ;

D'Ambrosio, G ;

Doser, M ;

Feng, JL ;

Gherghetta, T ;

Gibbons, L ;

Goodman, M ;

Grab, C ;

Groom, DE ;

Gurtu, A ;

Hagiwara, K ;

Hernández-Rey, JJ ;

Hikasa, K ;

Honscheid, K ;

Jawahery, H ;

Kolda, C ;

Kwon, Y ;

Mangano, ML ;

Manohar, AV ;

March-Russell, J ;

Masoni, A ;

Miquel, R ;

Mönig, K ;

Murayama, H ;

Nakamura, K ;

Navas, S ;

Pape, L ;

Patrignani, C ;

Piepke, A ;

Raffelt, G ;

Roos, M ;

Tanabashi, M ;

Terning, J ;

Törnqvist, NA ;

Trippe, TG ;

Vogel, P ;

Wohl, CG .

PHYSICS LETTERS B, 2004, 592 (1-4) :1-1109

[10] 2ND-ORDER POWER CORRECTIONS IN THE HEAVY-QUARK EFFECTIVE THEORY .2. BARYON FORM-FACTORS [J].

FALK, AF ;

NEUBERT, M .

PHYSICAL REVIEW D, 1993, 47 (07) :2982-2990

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