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 Search for a heavy vector resonance decaying to a $${\mathrm{Z}}_{\mathrm{}}^{\mathrm{}}$$  boson and a Higgs boson in proton-proton collisions at $$\sqrt{s} = 13\,\text {Te}\text {V} $$

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
A. M. Sirunyan ◽  
A. Tumasyan ◽  
W. Adam ◽  
T. Bergauer ◽  
M. Dragicevic ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Branching Fraction ◽  
Vector Boson ◽  
Hadronic Decays ◽  
Vector Resonance ◽  
Proton Proton ◽  
Leptonic Decays ◽  
Upper Limits ◽  
Proton Proton Collisions

AbstractA search is presented for a heavy vector resonance decaying into a $${\mathrm{Z}}_{\mathrm{}}^{\mathrm{}}$$ Z boson and the standard model Higgs boson, where the $${\mathrm{Z}}_{\mathrm{}}^{\mathrm{}}$$ Z boson is identified through its leptonic decays to electrons, muons, or neutrinos, and the Higgs boson is identified through its hadronic decays. The search is performed in a Lorentz-boosted regime and is based on data collected from 2016 to 2018 at the CERN LHC, corresponding to an integrated luminosity of 137$$\,\text {fb}^{-1}$$ fb - 1 . Upper limits are derived on the production of a narrow heavy resonance $${\mathrm{{{\mathrm{Z}}_{\mathrm{}}^{\mathrm{}}}}}_{\mathrm{}}^{\mathrm{\prime }}$$ Z ′ , and a mass below 3.5 and 3.7$$\,\text {Te}\text {V}$$ Te is excluded at 95% confidence level in models where the heavy vector boson couples predominantly to fermions and to bosons, respectively. These are the most stringent limits placed on the Heavy Vector Triplet $${\mathrm{{{\mathrm{Z}}_{\mathrm{}}^{\mathrm{}}}}}_{\mathrm{}}^{\mathrm{\prime }}$$ Z ′ model to date. If the heavy vector boson couples exclusively to standard model bosons, upper limits on the product of the cross section and branching fraction are set between 23 and 0.3$$\,\text {fb}$$ fb for a $${\mathrm{{{\mathrm{Z}}_{\mathrm{}}^{\mathrm{}}}}}_{\mathrm{}}^{\mathrm{\prime }}$$ Z ′ mass between 0.8 and 4.6$$\,\text {Te}\text {V}$$ Te , respectively. This is the first limit set on a heavy vector boson coupling exclusively to standard model bosons in its production and decay.

PHYSICS ISSUES IN η′ DECAYS

2005 ◽  
Vol 20 (02n03) ◽  
pp. 532-535 ◽  
Author(s):  
MAGNUS WOLKE
Keyword(s):  
Radiative Decay ◽  
Light Quark ◽  
Mass Difference ◽  
Experimental Information ◽  
Hadronic Decays ◽  
Fundamental Physics ◽  
Leptonic Decays ◽  
Light Quark Mass ◽  
Isospin Symmetry Breaking ◽  
Shed Light

Studies of hadronic, radiative, and (semi–)leptonic decays of the η′ allow to shed light on a broad field of fundamental physics questions. Isospin symmetry breaking decays provide a well-suited tool to extract the light quark mass difference. Differential distributions in hadronic decays both test predictions obtained within ChPT approaches, and enclose information on the scalar meson sector. Precision measurements on radiative decay widths will constrain pseudoscalar mixing, the manifestation of QCD anomalies, and the structure of the η′. The latter is also subject of investigation in semileptonic decays probing the η′ transition form factor. The presently available experimental information is reviewed, and prospects for η′ decay physics with WASA at COSY are presented.

scholarly journals SUPERFICIAL NON-UNITARITY OF THE QUARK-MIXING MATRIX AS A POSSIBLE EVIDENCE FOR THE SUBSTRUCTURE OF QUARKS

1996 ◽  
Vol 11 (30) ◽  
pp. 2463-2472
Author(s):  
HIDEZUMI TERAZAWA
Keyword(s):  
Momentum Transfer ◽  
Precise Measurement ◽  
Branching Ratios ◽  
Hadronic Decays ◽  
Leptonic Decays ◽  
Quark Mixing ◽  
Composite Models ◽  
Mixing Matrix ◽  
Momentum Transfer Dependence

Superficial non-unitarity of the quark-mixing matrix, which has been predicted to be momentum transfer dependent due to the possible substructure of quarks, is discussed in composite models of quarks and leptons. A precise measurement of the momentum transfer dependence of the branching ratios for inclusive hadronic decays of τ→vτ+ hadrons and for inclusive semi-leptonic decays of K, D, B and [Formula: see text] hadrons is proposed as one of the best experimental searches for a possible evidence of the substructure of quarks.

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

Puzzles in Hadronic Charmonium Decays

1997 ◽  
Vol 12 (22) ◽  
pp. 4069-4078 ◽  
Author(s):  
Stephen L. Olsen
Keyword(s):  
Pseudoscalar Meson ◽  
Experimental Studies ◽  
Decay Rates ◽  
Hadronic Decays ◽  
Final States ◽  
Tensor Meson ◽  
Meson Decays ◽  
Charmonium States

Recent results of experimental studies of hadronic decays of charmonium states using the BES detector are reported. A number of puzzling features are observed. Foremost among these is the large discrepancy between the decay rates for J/ψ and ψ(2S) decays to ρπ and [Formula: see text] final states, first observed by the Mark II experiment. We find suppressions for ψ(2S) decays to these modes of factors in excess of sixty and twenty, respectively. Similar, although less dramatic, suppressions of vector plus tensor meson final states are also observed. No suppression is seen for axialvector plus pseudoscalar meson decays, but a strong flavor-SU(3) violation is seen in [Formula: see text] final states that has an opposite character for the J/ψ and ψ(2S).

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

Generation of the Leptonic Asymmetry in the Sterile Neutrino Hadronic Decays

2013 ◽  
Vol 58 (9) ◽  
pp. 811-826
Author(s):  
V.M. Gorkavenko ◽  
◽  
I.V. Rudenok ◽  
S.I. Vilchynskiy ◽  
◽  
...  
Keyword(s):  
Sterile Neutrino ◽  
Hadronic Decays
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