First measurement of the forward-backward asymmetry in bottom-quark pair production at high mass

We measure the particle-level forward-backward production asymmetry in bb pairs with masses ( m sub(b)b larger than 150 GeV /c super(2), using events with hadronic jets and employing jet charge to distinguish b from b. The measurement uses 9.5 fb super(-1) of pp collisions at a center-of-mass energy...

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Veröffentlicht in:	Physical review. D 2015-08, Vol.92 (3), Article 032006
Hauptverfasser:	Aaltonen, T., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., Antos, J., Apollinari, G., Appel, J. A., Arisawa, T., Artikov, A., Asaadi, J., Ashmanskas, W., Auerbach, B., Aurisano, A., Azfar, F., Badgett, W., Bae, T., Barbaro-Galtieri, A., Barnes, V. E., Barnett, B. A., Barria, P., Bartos, P., Bauce, M., Bedeschi, F., Behari, S., Bellettini, G., Bellinger, J., Benjamin, D., Beretvas, A., Bhatti, A., Bland, K. R., Blumenfeld, B., Bocci, A., Bodek, A., Bortoletto, D., Boudreau, J., Boveia, A., Brigliadori, L., Bromberg, C., Brucken, E., Budagov, J., Budd, H. S., Burkett, K., Busetto, G., Bussey, P., Butti, P., Buzatu, A., Calamba, A., Camarda, S., Campanelli, M., Canelli, F., Carls, B., Carlsmith, D., Carosi, R., Carrillo, S., Casal, B., Casarsa, M., Castro, A., Catastini, P., Cauz, D., Cavaliere, V., Cerri, A., Cerrito, L., Chen, Y. C., Chertok, M., Chiarelli, G., Chlachidze, G., Cho, K., Chokheli, D., Clark, A., Clarke, C., Convery, M. E., Conway, J., Corbo, M., Cordelli, M., Cox, C. A., Cox, D. J., Cremonesi, M., Cruz, D., Cuevas, J., Culbertson, R., d’Ascenzo, N., Datta, M., de Barbaro, P., Demortier, L., Deninno, M., D’Errico, M., Devoto, F., Di Canto, A., Di Ruzza, B., Dittmann, J. R., Donati, S., D’Onofrio, M., Dorigo, M., Driutti, A., Ebina, K., Edgar, R., Elagin, A., Erbacher, R., Errede, S.
Format:	Artikel
Sprache:	eng
Schlagworte:	Asymmetry Collisions Cosmology Energy use Gravitation Jets Mathematical models Pair production PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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Zusammenfassung:	We measure the particle-level forward-backward production asymmetry in bb pairs with masses ( m sub(b)b larger than 150 GeV /c super(2), using events with hadronic jets and employing jet charge to distinguish b from b. The measurement uses 9.5 fb super(-1) of pp collisions at a center-of-mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of m sub(b)bis consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200 GeV /c super(2), whereas a model containing a heavier 345 GeV /c super(2) axigluon is not excluded.
ISSN:	1550-7998 2470-0010 1550-2368 2470-0029
DOI:	10.1103/PhysRevD.92.032006