scholarly journals NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders

2012 ◽  
Vol 2012 (10) ◽  
Author(s):  
A. Denner ◽  
S. Dittmaier ◽  
S. Kallweit ◽  
S. Pozzorini
Keyword(s):  
Hadron Colliders ◽  
Leptonic Decays

scholarly journals Identifying hadronic charmonium decays in hadron colliders

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Nicolo De Groot ◽  
Sergi Castells
Keyword(s):  
Large Majority ◽  
Hadronic Decays ◽  
Hadron Colliders ◽  
Leptonic Decays ◽  
Gluon Jets ◽  
Charmonium States

Identification of charmonium states at hadron colliders has mostly been limited to leptonic decays of the J/\psiJ/ψ. In this paper we present an algorithm to identify hadronic decays of charmonium states (J/\psiJ/ψ, \psiψ(2S), \chi_{c0,c1,c2}χc0,c1,c2) which make up the large majority of all decays. The algorithm is able to identify hadronic J/\psiJ/ψ decays with an efficiency of 36% while suppressing a background of quark and gluon jets by a factor 100.

scholarly journals B-hadron production in NNLO QCD: application to LHC t$$ \overline{t} $$ events with leptonic decays

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Michał Czakon ◽  
Terry Generet ◽  
Alexander Mitov ◽  
Rene Poncelet
Keyword(s):  
Top Quark ◽  
Hadron Production ◽  
Precise Determination ◽  
Heavy Flavor ◽  
Hadron Colliders ◽  
Top Quark Mass ◽  
Leptonic Decays ◽  
Heavy Hadron ◽  
First Time

Abstract We calculate, for the first time, the NNLO QCD corrections to identified heavy hadron production at hadron colliders. The calculation is based on a flexible numeric framework which allows the calculation of any distribution of a single identified heavy hadron plus jets and non-QCD particles. As a first application we provide NNLO QCD predictions for several differential distributions of B hadrons in t$$ \overline{t} $$ t ¯ events at the LHC. Among others, these predictions are needed for the precise determination of the top quark mass. The extension of our results to other processes, like open or associated B and charm production is straightforward. We also explore the prospects for extracting heavy flavor fragmentation functions from LHC data.

The Z boson aTdistribution at hadron colliders

2009 ◽  
Author(s):  
Andrea Banfi ◽  
Rosa Maria Duran Delgado ◽  
Mrinal Dasgupta
Keyword(s):  
Z Boson ◽  
Hadron Colliders

Parity-Odd Asymmetries inW-Jet Events at Hadron Colliders

1984 ◽  
Vol 52 (13) ◽  
pp. 1076-1079 ◽  
Author(s):  
Kaoru Hagiwara ◽  
Ken-ichi Hikasa ◽  
Naoyuki Kai
Keyword(s):  
Hadron Colliders

scholarly journals Contribution of the Darwin operator to non-leptonic decays of heavy quarks

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Alexander Lenz ◽  
Maria Laura Piscopo ◽  
Aleksey V. Rusov
Keyword(s):  
Standard Technique ◽  
Quark Propagator ◽  
Leptonic Decay ◽  
Leptonic Decays ◽  
Interference Contribution ◽  
The Standard Model ◽  
Strength Tensor ◽  
Quark Flavour ◽  
Quark Decay ◽  
B Quark

Abstract We compute the Darwin operator contribution ($$ 1/{m}_b^3 $$ 1 / m b 3 correction) to the width of the inclusive non-leptonic decay of a B meson (B+, Bd or Bs), stemming from the quark flavour-changing transition b → $$ {q}_1{\overline{q}}_2{q}_3 $$ q 1 q ¯ 2 q 3 , where q1, q2 = u, c and q3 = d, s. The key ideas of the computation are the local expansion of the quark propagator in the external gluon field including terms with a covariant derivative of the gluon field strength tensor and the standard technique of the Heavy Quark Expansion (HQE). We confirm the previously known expressions of the $$ 1/{m}_b^3 $$ 1 / m b 3 contributions to the semi-leptonic decay b → $$ {q}_1\mathrm{\ell}{\overline{\nu}}_{\mathrm{\ell}} $$ q 1 ℓ ν ¯ ℓ , with ℓ = e, μ, τ and of the $$ 1/{m}_b^2 $$ 1 / m b 2 contributions to the non-leptonic modes. We find that this new term can give a sizeable correction of about −4 % to the non-leptonic decay width of a B meson. For Bd and Bs mesons this turns out to be the dominant correction to the free b-quark decay, while for the B+ meson the Darwin term gives the second most important correction — roughly 1/2 to 1/3 of the phase space enhanced Pauli interference contribution. Due to the tiny experimental uncertainties in lifetime measurements the incorporation of the Darwin term contribution is crucial for precision tests of the Standard Model.

scholarly journals Optimized probes of CP-odd effects in the tt¯h process at hadron colliders

2021 ◽  
Vol 964 ◽  
pp. 115328
Author(s):  
Blaž Bortolato ◽  
Jernej F. Kamenik ◽  
Nejc Košnik ◽  
Aleks Smolkovič
Keyword(s):  
Hadron Colliders

scholarly journals Impact of non-Gaussian beam profiles in the performance of hadron colliders

2020 ◽  
Vol 23 (10) ◽  
Author(s):  
S. Papadopoulou ◽  
F. Antoniou ◽  
T. Argyropoulos ◽  
M. Hostettler ◽  
Y. Papaphilippou ◽  
...  
Keyword(s):  
Gaussian Beam ◽  
Hadron Colliders ◽  
Non Gaussian
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