Search for maximal flavor violating scalars in same-charge lepton pairs in pp collisions at sqrt[s]=1.96 TeV

• Published in: Physical review letters 2009-01, Vol.102 (4), p.041801-041801
• Main Authors: Aaltonen, T, Adelman, J, Akimoto, T, Albrow, M G, Alvarez González, B, Amerio, S, Amidei, D, Anastassov, A, Annovi, A, Antos, J, Aoki, M, Apollinari, G, Apresyan, A, Arisawa, T, Artikov, A, Ashmanskas, W, Attal, A, Aurisano, A, Azfar, F, Azzi-Bacchetta, P, Azzurri, P, Bacchetta, N, Badgett, W, Barbaro-Galtieri, A, Barnes, V E, Barnett, B A, Baroiant, S, Bar-Shalom, S, Bartsch, V, Bauer, G, Beauchemin, P-H, Bedeschi, F, Bednar, P, Behari, S, Bellettini, G, Bellinger, J, Belloni, A, Benjamin, D, Beretvas, A, Beringer, J, Berry, T, Bhatti, A, Binkley, M, Bisello, D, Bizjak, I, Blair, R E, Blocker, C, Blumenfeld, B, Bocci, A, Bodek, A, Boisvert, V, Bolla, G, Bolshov, A, Bortoletto, D, Boudreau, J, Boveia, A, Brau, B, Bridgeman, A, Brigliadori, L, Bromberg, C, Brubaker, E, Budagov, J, Budd, H S, Budd, S, Burkett, K, Busetto, G, Bussey, P, Buzatu, A, Byrum, K L, Cabrera, S, Campanelli, M, Campbell, M, Canelli, F, Canepa, A, Carlsmith, D, Carosi, R, Carrillo, S, Carron, S, Casal, B, Casarsa, M, Castro, A, Catastini, P, Cauz, D, Cavalli-Sforza, M, Cerri, A, Cerrito, L, Chang, S H, Chen, Y C, Chertok, M, Chiarelli, G, Chlachidze, G, Chlebana, F, Cho, K, Chokheli, D, Chou, J P, Choudalakis, G, Chuang, S H, Chung, K, Chung, W H, Chung, Y S
• Format: Article
• Language: English
• ISSN: 0031-9007

Models of maximal flavor violation (MxFV) in elementary particle physics may contain at least one new scalar SU(2) doublet field Phi(FV)=(eta(0),eta(+)) that couples the first and third generation quarks (q_(1), q_(3)) via a Lagrangian term L(FV)=xi(13)Phi(FV)q(1)q(3). These models have a distinctive signature of same-charge top-quark pairs and evade flavor-changing limits from meson mixing measurements. Data corresponding to 2 fb(-1) collected by the Collider Dectector at Fermilab II detector in pp[over ] collisions at sqrt[s]=1.96 TeV are analyzed for evidence of the MxFV signature. For a neutral scalar eta(0) with m_(eta;(0))=200 GeV/c(2) and coupling xi(13)=1, approximately 11 signal events are expected over a background of 2.1+/-1.8 events. Three events are observed in the data, consistent with background expectations, and limits are set on the coupling xi(13) for m(eta(0)=180-300 GeV/c(2).