scholarly journals Littlest Higgs model and top-charm production at high-energy linear colliders

2005 ◽  
Vol 624 (1-2) ◽  
pp. 39-46 ◽  
Author(s):  
Chong-Xing Yue ◽  
Lei Wang ◽  
Yi-Qun Di ◽  
Shuo Yang
Keyword(s):  
High Energy ◽  
Higgs Model ◽  
Charm Production ◽  
Linear Colliders

scholarly journals Probing the gauge bosons and from the littlest Higgs model in the high-energy linear colliders

2005 ◽  
Vol 716 (1-2) ◽  
pp. 199-214 ◽  
Author(s):  
Chong-Xing Yue ◽  
Wei Wang ◽  
Feng Zhang
Keyword(s):  
High Energy ◽  
Higgs Model ◽  
Gauge Bosons ◽  
Linear Colliders

Littlest Higgs Model and Spin Correlation of Top Quark Production at High Energy Linear e + e − Colliders

2006 ◽  
Vol 23 (9) ◽  
pp. 2379-2382 ◽  
Author(s):  
Yue Chong-Xing ◽  
Wang Lei ◽  
Wang Li-Na ◽  
Zhang Yan-Ming
Keyword(s):  
Top Quark ◽  
Spin Correlation ◽  
High Energy ◽  
Higgs Model ◽  
Top Quark Production ◽  
Quark Production

scholarly journals New vistas in charm production

2019 ◽  
Vol 206 ◽  
pp. 02004
Author(s):  
Antoni Szczurek
Keyword(s):  
Large Deviations ◽  
Transition Probabilities ◽  
High Energy ◽  
Lhcb Collaboration ◽  
Charm Production ◽  
High Energy Neutrino ◽  
Neutrino Production ◽  
Energy Neutrino ◽  
Low Energies

We discuss some new aspects of charm production trigerred by recent observations of the LHCb collaboration. The LHCb collaboration measured small asymmetries in production of D+D−mesons as well as $ D_s^ + D_s^ - $ mesons. Is this related to initial quark/antiquark asymmetries in the proton ? Here we discuss a scenario in which unfavored fragmentations $ q/\bar {q} \to D $ and $ s/\bar {s} \to D_s $ are responsible for the asymmetries. We fix the strength of such fragmentations – transition probabilities, by adjusting to the size of the LHCb asymmetries. This has consequences for production of D mesons in forward directions (large xF ) as well as at low energies. Large asymmetries are predicted then in these regions. We present here some of our predictions. Consequences for high-energy neutrino production in the atmosphere are discussed and quantified. The production of Λc baryon at the LHC is disussed. Large deviations from the independent-parton fragmentation picture are found.

scholarly journals Intrinsic charm in the nucleon and charm production at large rapidities in collinear, hybrid and kT-factorization approaches

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Rafał Maciuła ◽  
Antoni Szczurek
Keyword(s):  
Transverse Momentum ◽  
High Energy ◽  
Charm Production ◽  
Leading Order ◽  
Collinear Factorization ◽  
Factorization Approach ◽  
High Energies ◽  
Neutrino Production ◽  
Intrinsic Charm ◽  
Gluon Distributions

Abstract We discuss the role of intrinsic charm (IC) in the nucleon for forward production of c-quark (or $$ \overline{c} $$ c ¯ -antiquark) in proton-proton collisions for low and high energies. The calculations are performed in collinear-factorization approach with on-shell partons, kT-factorization approach with off-shell partons as well as in a hybrid approach using collinear charm distributions and unintegrated (transverse momentum dependent) gluon distributions. For the collinear-factorization approach we use matrix elements for both massless and massive charm quarks/antiquarks. The distributions in rapidity and transverse momentum of charm quark/antiquark are shown for a few different models of IC. Forward charm production is dominated by gc-fusion processes. The IC contribution dominates over the standard pQCD (extrinsic) gg-fusion mechanism of $$ c\overline{c} $$ c c ¯ -pair production at large rapidities or Feynman-xF. We perform similar calculations within leading-order and next-to-leading order kT-factorization approach. The kT-factorization approach leads to much larger cross sections than the LO collinear approach. At high energies and large rapidities of c-quark or $$ \overline{c} $$ c ¯ -antiquark one tests gluon distributions at extremely small x. The IC contribution has important consequences for high-energy neutrino production in the Ice-Cube experiment and can be, to some extent, tested at the LHC by the SHIP and FASER experiments by studies of the ντ neutrino production.

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