TY - JOUR
T1 - Forward Tevatron top quarks and backward LHC top quarks with associates
AU - Drobnak, Jure
AU - Kagan, Alexander L.
AU - Kamenik, Jernej F.
AU - Perez, Gilad
AU - Zupan, Jure
N1 - Slovenian Research Agency; DOE [FG02-84-ER40153]; Gruber foundation; IRG; ISF; Minerva; U.S. National Science Foundation under CAREER Grant [PHY-1151392]We thank Yonit Hochberg and Jessie Shelton for discussions and V. Ahrens for communication regarding the SM predictions for the t (t) over bar cross sections. J. D. thanks C. Duhr and O. Mattelaer for enlightening discussions as well as the Lawrence Berkeley National Laboratory and University of Cincinnati, where part of this work was completed, for their hospitality. We thank the organizers of the NPKI Workshop "Top physics and electroweak symmetry breaking in the LHC era," Seoul, February 2012, for their hospitality in the initial stage of this work. The work of J. D. and J. F. K. was supported in part by the Slovenian Research Agency. A. L. K. was supported in part by DOE Grant No. FG02-84-ER40153. G. P. is supported by the grants from Gruber foundation, IRG, ISF and Minerva. J. Z. was supported in part by the U.S. National Science Foundation under CAREER Grant No. PHY-1151392.
PY - 2012/11/27
Y1 - 2012/11/27
N2 - The anomalous forward-backward asymmetry (A FB) in tt̄ production at the Tevatron is in apparent contradiction with the tt̄ charge asymmetry (A C) measurements at the LHC, which agree well with the standard model predictions. We argue that associated production of a state with [ut̄] flavor quantum numbers can lead to a sizable negative contribution to A C. Exchange of such a resonance in the t channel would lead to positive contributions to A FB and A C, as has been extensively discussed in the literature. Given the additional negative A C contribution, both the Tevatron and LHC data can be naturally accommodated within this framework. A simple realization of this setup is the well known example of a Z ′ with flavor off-diagonal up-top couplings. We provide a detailed study of this model, demonstrating that it indeed reproduces the tt̄ asymmetry data, and is compatible with other constraints, e.g., t+jet resonance searches, tt̄ inclusive jet multiplicities, and atomic parity violation.
AB - The anomalous forward-backward asymmetry (A FB) in tt̄ production at the Tevatron is in apparent contradiction with the tt̄ charge asymmetry (A C) measurements at the LHC, which agree well with the standard model predictions. We argue that associated production of a state with [ut̄] flavor quantum numbers can lead to a sizable negative contribution to A C. Exchange of such a resonance in the t channel would lead to positive contributions to A FB and A C, as has been extensively discussed in the literature. Given the additional negative A C contribution, both the Tevatron and LHC data can be naturally accommodated within this framework. A simple realization of this setup is the well known example of a Z ′ with flavor off-diagonal up-top couplings. We provide a detailed study of this model, demonstrating that it indeed reproduces the tt̄ asymmetry data, and is compatible with other constraints, e.g., t+jet resonance searches, tt̄ inclusive jet multiplicities, and atomic parity violation.
UR - http://www.scopus.com/inward/record.url?scp=84870175572&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.86.094040
DO - 10.1103/PhysRevD.86.094040
M3 - مقالة
SN - 1550-7998
VL - 86
JO - Physical review D
JF - Physical review D
IS - 9
M1 - 094040
ER -