| Autor: |
Aaltonen, T, Amerio, S, Amidei, D, Anastassov, A, Annovi, A, Antos, J, Apollinari, G, Appel, JA, Arisawa, T, Artikov, A, Asaadi, J, Ashmanskas, W, Auerbach, B, Aurisano, A, Azfar, F, Badgett, W, Bae, T, Barbaro-Galtieri, A, Barnes, VE, Barnett, BA, Barria, P, Bartos, P, Bauce, M, Bedeschi, F, Behari, S, Bellettini, G, Bellinger, J, Benjamin, D, Beretvas, A, Bhatti, A, Bland, KR, Blumenfeld, B, Bocci, A, Bodek, A, Bortoletto, D, Boudreau, J, Boveia, A, Brigliadori, L, Bromberg, C, Brucken, E, Budagov, J, Budd, HS, 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, YC, Chertok, M, Chiarelli, G, Chlachidze, G, Cho, K, Chokheli, D, Clark, A, Clarke, C, Convery, ME, Conway, J, Corbo, M, Cordelli, M, Cox, CA, Cox, DJ, 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, JR, Donati, S, D'Onofrio, M, Dorigo, M, Driutti, A, Ebina, K, Edgar, R, Elagin, A, Erbacher, R, Errede, S |
| Rok vydání: |
2018 |
| Předmět: |
|
| Zdroj: |
Physical Review D, vol 98, iss 7 |
| Popis: |
The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (pp̄) collisions with a vertex displaced from the pp̄ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb-1, is used to measure the Z-boson production cross section times branching ratio into bb̄. The number of Z→bb̄ events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(pp̄→Z)×B(Z→bb̄)=1.11±0.08(stat)±0.14(syst) nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive pp̄→H→bb̄ process at s=1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6 pb, at the 95% confidence level. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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