Observation of the Production of a W Boson in Association with a Single
Charm Quark

Aaltonen, T.
Amerio, S.
Amidei, D.
Anastassov, A. and
Annovi, A.
Antos, J.
Apollinari, G.
Appel, J. A. and
Arisawa, T.
Artikov, A.
Asaadi, J.
Ashmanskas, W. and
Auerbach, B.
Aurisano, A.
Azfar, F.
Badgett, W.
Bae, T.
and Barbaro-Galtieri, A.
Barnes, V. E.
Barnett, B. A. and
Barria, P.
Bartos, P.
Bauce, M.
Bedeschi, F.
Behari, S.
and Bellettini, G.
Bellinger, J.
Benjamin, D.
Beretvas, A.
and Bhatti, A.
Bland, K. R.
Blumenfeld, B.
Bocci, A. and
Bodek, A.
Bortoletto, D.
Boudreau, J.
Boveia, A. and
Brigliadori, L.
Bromberg, C.
Brucken, E.
Budagov, J. and
Burkett, K.
Busetto, G.
Bussey, P.
Butti, P.
Buzatu, A.
and Calamba, A.
Camarda, S.
Campanelli, M.
Canelli, F. and
Carls, B.
Carlsmith, D.
Carosi, R.
Carrillo, S.
Casal,
B.
Casarsa, M.
Castro, A.
Catastini, P.
Cauz, D. and
Cavaliere, V.
Cavalli-Sforza, M.
Cerri, A.
Cerrito, L. and
Chen, Y. C.
Chertok, M.
Chiarelli, G.
Chlachidze, G. and
Cho, K.
Chou, J. P.
Chokheli, D.
Clark, A.
Clarke, C.
and Convery, M. E.
Conway, J.
Corbo, M.
Cordelli, M. and
Cox, C. A.
Cox, D. J.
Cremonesi, M.
Cuevas, J. and
Culbertson, R.
d&apos

Observation of the Production of a W Boson in Association with a Single Charm Quark

Authors: T. Aaltonen Amerio, S. Amidei, D. Anastassov, A. and Annovi, A. Antos, J. Apollinari, G. Appel, J. A. and Arisawa, T. Artikov, A. Asaadi, J. Ashmanskas, W. and Auerbach, B. Aurisano, A. Azfar, F. Badgett, W. Bae, T. and Barbaro-Galtieri, A. Barnes, V. E. Barnett, B. A. and Barria, P. Bartos, P. Bauce, M. Bedeschi, F. Behari, S. and Bellettini, G. Bellinger, J. Benjamin, D. Beretvas, A. and Bhatti, A. Bland, K. R. Blumenfeld, B. Bocci, A. and Bodek, A. Bortoletto, D. Boudreau, J. Boveia, A. and Brigliadori, L. Bromberg, C. Brucken, E. Budagov, J. and Burkett, K. Busetto, G. Bussey, P. Butti, P. Buzatu, A. and Calamba, A. Camarda, S. Campanelli, M. Canelli, F. and Carls, B. Carlsmith, D. Carosi, R. Carrillo, S. Casal, B. Casarsa, M. Castro, A. Catastini, P. Cauz, D. and Cavaliere, V. Cavalli-Sforza, M. Cerri, A. Cerrito, L. and Chen, Y. C. Chertok, M. Chiarelli, G. Chlachidze, G. and Cho, K. Chou, J. P. Chokheli, D. Clark, A. Clarke, C. and Convery, M. E. Conway, J. Corbo, M. Cordelli, M. and Cox, C. A. Cox, D. J. Cremonesi, M. Cuevas, J. and Culbertson, R. d&apos
Publication date: 1 January 2013
Publisher

Abstract

The first observation of the production of a W boson with a single charm quark (c) jet in p (p) over bar collisions at root s = 1.96 TeV is reported. The analysis uses data corresponding to 4.3 fb(-1), recorded with the CDF II detector at the Fermilab Tevatron. Charm quark candidates are selected through the identification of an electron or muon from charm-hadron semileptonic decay within a hadronic jet, and a Wc signal is observed with a significance of 5.7 standard deviations. The production cross section sigma(Wc) (p(Tc) > 20 GeV/c, vertical bar eta(c)vertical bar < 1.5) x B(W -> l nu) is measured to be 13.6(-3.1)(+3.4) pb and is in agreement with theoretical expectations. From this result the magnitude of the quark-mixing matrix element V-cs is derived, vertical bar V-cs vertical bar = 1.08 +/- 0.16 along with a lower limit of vertical bar V-cs vertical bar > 0.71 at the 95% confidence level, assuming that the Wc production through c to s quark coupling is dominant. DOI: 10.1103/PhysRevLett.110.07180

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