R-parity violating supersymmetric explanation for the large t(t)over-bar forward-backward asymmetry

被引：8

作者：

Allanach, B. C. ^{[1
]}

Sridhar, K. ^{[2
]}

机构：

[1] Univ Cambridge, Dept Appl Math & Theoret Phys, Ctr Math Sci, Cambridge CB3 0WA, England

[2] TIFR, Bombay 400005, Maharashtra, India

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 07期

关键词：

QUARK PAIR PRODUCTION; CHARGE ASYMMETRY; COLLISIONS; COUPLINGS; BOUNDS;

D O I：

10.1103/PhysRevD.86.075016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We examine a supersymmetric explanation for the anomalously high forward-backward asymmetry in top pair production measured by CDF and D0. We suppose that it is due to the t-channel exchange of a right-handed sbottom which couples to d(R) and t(R), as is present in the R-parity violating minimal supersymmetric standard model. We show that all Tevatron and LHC experiments' t (t) over bar constraints may be respected for a sbottom mass between 300 and 1200 GeV, and a large Yukawa coupling >2.2, yielding A(FB) up to 0.18. The non-Standard Model contribution to the LHC charge asymmetry parameter is Delta A(C)(y) = 0.017-0.045, small enough to be consistent with current measurements but nonzero and positive, allowing for LHC confirmation in the future within 20 fb(-1). A small additional contribution to the LHC t (t) over bar production cross section is also predicted, allowing a further test. We estimate that 10 fb(-1) of LHC luminosity would be sufficient to rule out the proposal to 95% confidence level, if the measurements of the t (t) over bar cross section turn out to be centered on the Standard Model prediction.

引用

页数：5

共 37 条

[1]

Aad G, 2012, EUR PHYS J C, V72, DOI 10.1140/epjc/s10052-012-2039-5

[2] Evidence for a mass dependent forward-backward asymmetry in top quark pair production [J].

Aaltonen, T. ;

Gonzalez, B. Alvarez ;

Amerio, S. ;

Amidei, D. ;

Anastassov, A. ;

Annovi, A. ;

Antos, J. ;

Apollinari, G. ;

Appel, J. A. ;

Apresyan, A. ;

Arisawa, T. ;

Artikov, A. ;

Asaadi, J. ;

Ashmanskas, W. ;

Auerbach, B. ;

Aurisano, A. ;

Azfar, F. ;

Badgett, W. ;

Barbaro-Galtieri, A. ;

Barnes, V. E. ;

Barnett, B. A. ;

Barria, P. ;

Bartos, P. ;

Bauce, M. ;

Bauer, G. ;

Bedeschi, F. ;

Beecher, D. ;

Behari, S. ;

Bellettini, G. ;

Bellinger, J. ;

Benjamin, D. ;

Beretvas, A. ;

Bhatti, A. ;

Binkley, M. ;

Bisello, D. ;

Bizjak, I. ;

Bland, K. R. ;

Blumenfeld, B. ;

Bocci, A. ;

Bodek, A. ;

Bortoletto, D. ;

Boudreau, J. ;

Boveia, A. ;

Brau, B. ;

Brigliadori, L. ;

Brisuda, A. ;

Bromberg, C. ;

Brucken, E. ;

Bucciantonio, M. ;

Budagov, J. .

PHYSICAL REVIEW D, 2011, 83 (11)

[3] First Measurement of the t(t) over bar Differential Cross Section dσ/dMt(t) over bar in p(p) over bar Collisions at √s=1.96 TeV [J].

Aaltonen, T. ;

Adelman, J. ;

Akimoto, T. ;

Alvarez Gonzalez, B. ;

Amerio, S. ;

Amidei, D. ;

Anastassov, A. ;

Annovi, A. ;

Antos, J. ;

Apollinari, G. ;

Apresyan, A. ;

Arisawa, T. ;

Artikov, A. ;

Ashmanskas, W. ;

Attal, A. ;

Aurisano, A. ;

Azfar, F. ;

Azzurri, P. ;

Badgett, W. ;

Barbaro-Galtieri, A. ;

Barnes, V. E. ;

Barnett, B. A. ;

Bartsch, V. ;

Bauer, G. ;

Beauchemin, P. -H. ;

Bedeschi, F. ;

Beecher, D. ;

Behari, S. ;

Bellettini, G. ;

Bellinger, J. ;

Benjamin, D. ;

Beretvas, A. ;

Beringer, J. ;

Bhatti, A. ;

Binkley, M. ;

Bisello, D. ;

Bizjak, I. ;

Blair, R. E. ;

Blocker, C. ;

Blumenfeld, B. ;

Bocci, A. ;

Bodek, A. ;

Boisvert, V. ;

Bolla, G. ;

Bortoletto, D. ;

Boudreau, J. ;

Boveia, A. ;

Brau, B. ;

Bridgeman, A. ;

Brigliadori, L. .

PHYSICAL REVIEW LETTERS, 2009, 102 (22)

[4]

Aaltonen T., 2012, 10584 CDF COLL

[5]

AALTONEN T, 2009, 9913 CDF COLL

[6] Forward-backward asymmetry in top quark-antiquark production [J].

Abazov, V. M. ;

Abbott, B. ;

Acharya, B. S. ;

Adams, M. ;

Adams, T. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Aoki, M. ;

Arov, M. ;

Askew, A. ;

Asman, B. ;

Atramentov, O. ;

Avila, C. ;

BackusMayes, J. ;

Badaud, F. ;

Bagby, L. ;

Baldin, B. ;

Bandurin, D. V. ;

Banerjee, S. ;

Barberis, E. ;

Baringer, P. ;

Barreto, J. ;

Bartlett, J. F. ;

Bassler, U. ;

Bazterra, V. ;

Beale, S. ;

Bean, A. ;

Begalli, M. ;

Begel, M. ;

Belanger-Champagne, C. ;

Bellantoni, L. ;

Beri, S. B. ;

Bernardi, G. ;

Bernhard, R. ;

Bertram, I. ;

Besancon, M. ;

Beuselinck, R. ;

Bezzubov, V. A. ;

Bhat, P. C. ;

Bhatnagar, V. ;

Blazey, G. ;

Blessing, S. ;

Bloom, K. ;

Boehnlein, A. ;

Boline, D. ;

Boos, E. E. ;

Borissov, G. .

PHYSICAL REVIEW D, 2011, 84 (11)

[7]

Aguilar-Saavedra J. A., ARXIV12022382

[8] Top-pair forward-backward asymmetry beyond next-to-leading order [J].

Ahrens, Valentin ;

Ferroglia, Andrea ;

Neubert, Matthias ;

Pecjak, Ben D. ;

Yang, Li Lin .

PHYSICAL REVIEW D, 2011, 84 (07)

[9] Renormalization-group improved predictions for top-quark pair production at hadron colliders [J].

Ahrens, Valentin ;

Ferroglia, Andrea ;

Neubert, Matthias ;

Pecjak, Ben D. ;

Yang, Li Lin .

JOURNAL OF HIGH ENERGY PHYSICS, 2010, (09)

[10] Hide and seek with natural supersymmetry at the LHC [J].

Allanach, B. C. ;

Gripaios, Ben .

JOURNAL OF HIGH ENERGY PHYSICS, 2012, (05)

← 1 2 3 4 →