With top quark physics now entering the precision era, the need for ever more accurate theory calculations is greater than ever. In this talk we present a formalism, derived from SCET, for the simultaneous resummation of soft and small mass logarithms present in top quark pair production at the LHC. By matching with standard soft gluon resummation and recent exact NNLO results, we present...
Measurements of the inclusive and differential top-quark pair cross sections in proton-proton collisions at both 8 and 13 TeV with the ATLAS detector at the Large Hadron Collider are presented. The inclusive measurements reach high precision and are compared to the best available theoretical calculations. Differential measurements of the kinematic properties of the top quark production are...
Measurements of the inclusive and differential top quark pair production cross section via the strong force at 7 TeV, 8 TeV and 13 TeV are presented, performed using CMS data collected in 2011, 2012 and 2015. The total cross section is measured in the lepton+jets, dilepton and fully hadronic channels, including the tau-dilepton and tau+jets modes. Indirect constraints on both the top quark...
I will discuss the impact of EW corrections on differential distributions in top-quark pair production at the LHC and future hadron colliders, focusing on the effects of initial-state photons. Performing a calculation at NLO in QCD+EW accuracy, the impact of photon-initiated channels is investigated in detail, on central values as well as PDF and scale uncertainties at order $\alpha_s\alpha$...
Differential distributions for top-quark pair production can be employed to extract the top-quark pole mass. In addition to precision measurements of these distributions, accurate predictions of the observables for different values of the masses are needed. Using next-to-next-to-leading order predictions a first extraction has been performed using data taken at the Tevatron. In this talk, I...
This talk focuses on the impact of top-quark spin polarization effects in Higgs boson production in association with a top-quark pair, where the Higgs boson decays to two photons. Predictions for the signal are compared with direct top-quark pair production in association with two photons at NLO+PS.
Precise measurements of the properties of the top quark test the Standard Model (SM) and can be used to constrain new physics models. As it may be significantly enhanced by the presence of new physics, the ttbar production charge asymmetry is measured inclusively and differentially using the 8 TeV ATLAS dataset using both the lepton+jets and dilepton channels, including a dedicated measurement...
Measurements of several top-quark properties are presented, obtained from the CMS data collected at various centre-of-mass energies. The results include measurements of the top pair charge asymmetry, the $W$ helicity in top decays, $CP$ violation, $t\bar{t}$ spin correlation, top polarisation and the search for anomalous couplings including Flavour Changing Neutral Currents. The results are...
Measurements of single top-quark production in proton-proton collisions are presented based on the 8 TeV and 13 TeV ATLAS datasets. In the leading order process, a $W$ boson is exchanged in the $t$-channel. The cross-section for the production of single top-quarks and single anti-top-quarks total production cross sections, their ratio, as well as a measurement of the inclusive production cross...
Measurements of single top quark production are presented, performed using CMS data collected in 2011, 2012 and 2015 at centre-of-mass energies of 7, 8 and 13 TeV respectively. The cross sections for the electroweak production of single top quarks in the $t$-channel and in association with $W$-bosons is measured and the results are used to place constraints on the CKM matrix element $V_{tb}$....
The electroweak production of single top quarks offers a unique laboratory for precision tests of top-quark related parameters of the Standard Model and possible extensions thereof. To obtain a precise and accurate parameter determination efficient, unbiased and theoretically unambigous analysis methods are needed. The Matrix Element Method (MEM) has proven beneficial to make maximal use of...
I discuss the interpretation of the top-quark mass measurements, which rely on the use of Monte Carlo parton showers, in terms of theoretical definitions, such as the pole mass. I also debate the role played by non-perturbative effects, namely colour reconnection and bottom-quark hadronization, in the top-mass determination and present preliminary results, based on the simulation of fictitious...
Measurements of the top quark mass are presented, obtained from CMS data collected in proton proton collisions at the LHC at centre-of-mass energies of 7 TeV and 8 TeV. The mass of the top quark is measured using several methods and channels, including the reconstructed invariant mass distribution of the top quark, an analysis of endpoint spectra as well as measurements from shapes of top...
The latest measurements of the top quark mass using the ATLAS experiment are presented. A measurement based on a multi-dimensional template fit that can constrain the uncertainties on the energy measurements of jets is presented and combined with a measurement using dilepton events. A measurement in the all-hadronic channel is also reported. In addition an analysis of the top quark mass using...
We present a method to establish experimentally the relation between the top-quark mass $m_t^{MC}$ as implemented in Monte-Carlo generators and the Lagrangian mass parameter $m_t$ in a theoretically well-defined renormalization scheme. We propose a simultaneous fit of $m_t^{MC}$ and an observable sensitive to $m_t$, which does not rely on any prior assumptions about the relation between $m_t$...
BESIII collected the world largest data samples of 2.93, 0.482 and 0.567 fb-1 data at 3.773, 4.009 and 4.6 GeV, respectively. Based on these data samples, BESIII perform some analyses of $D^{0(+)}$, $D_{s}^{+}$ and $\Lambda_{c}^{+}$, which are important to understand the weak decay machanisms of charmed mesons and baryons. The leptonic decays of $D^{+} \to \tau^{+}\nu_{\tau}$ and $D_{s}^{+}...
We report recent results on $B$ decays from Belle experiment at KEKB collider. $B \to D^{*} \tau \bar{\nu}_{\tau}$ mode is sensitive to probe New Physics such as charged Higgs or leptoquark, and the current world average of the branching ratio shows discrepancy from the Standard Model. Belle has performed a new measurement of this mode using tau decays to hadronic final states, which is...
Rare decays of $B$ mesons and $b$ hadrons provide sensitive indirect probes
of effects beyond the Standard Model (SM). In the SM, these decays are
forbidden at tree level and are therefore suppressed. In particular, the
$b \to s\ell\ell$ processes give access to many observables where effects of New
Physics can be observed. The LHCb experiment is designed for these
searches due to its large...
We study the pseudoscalar and vector $B$ mesons decay constants within the framework of the light cone quark model (LCQM). LCQM deals with the wave function defined on the four-dimensional space-time plane defined by $x^{+} = x^{0} + x^{3}$ and includes the important relativistic effects that are neglected in the traditional constituent quark model. With the help of known values of constituent...
The Belle II experiment at the SuperKEKB collider is a major upgrade of the KEK “B factory” facility in Tsukuba, Japan aiming at an increase of the peak luminosity by a factor of 40. Commissioning of the SuperKEKB main ring took place in the first half of 2016. Phase 2 of the commissioning will start beginning of 2018 after the installation of the final focus system in the IR but still without...
Combined HERA data on charm production in deeply inelastic scattering have earlier been used to determine the charm-quark running mass $m_c(m_c)$ in the $\overline{MS}$ renormalisation scheme. The same data are used differentially as a function of the photon virtuality $Q^2$ to evaluate the charm-quark running mass at different scales to one-loop order, in the context of a next-to-leading...
Heavy quark measurements in hadronic collisions are useful tests of perturbative Quantum Chromodynamics (pQCD) calculations given their large mass ($m_{c,b}\gg\Lambda_{\mathrm{QCD}}$). These measurements can also probe the gluon distribution in protons at a relatively large $Q^2$. At RHIC energies, $b$-quark production is dominated by the leading order gluon-gluon fusion in contrast of the...
Heavy flavor particles produced in LHC pp collisions at 7, 8, and 13 TeV constitute an excellent opportunity to test the standard model and probe for new physics effects. Recent results by the CMS Collaboration on heavy flavor production and decays are presented.
In this talk, we present our recent work on heavy flavor production in heavy ion collisions. We develop a version of Soft Collinear Effective Theory (SCET) which includes finite quark masses, as well as Glauber gluons that describe the interaction of collinear partons with QCD matter. With such a framework (labeled SCET$_{\mathrm{M},\mathrm{G}}$), we derive the massive splitting functions in...
Charm and bottom quarks are produced in hard processes, in the early stages of relativistic hadron-hadron collisions. Due to their large masses, their initial production yield is practically unaffected by the later stages of the reaction. Therefore they provide us with unique means for understanding several aspects of Quantum Chromodynamics, from pure pQCD processes, to energy loss and...
Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm state $X(3872)$ and of $\psi(2S)$, in the decay mode $J/\psi \pi^{+} \pi^{-}$, measured at $\sqrt{s} = 8$ TeV by the ATLAS detector at LHC. In the non-prompt production, the data suggest the presence of a short-lived component, which my be due to $B_{c}$ decays. The dipion invariant mass in...
BESIII has collected about 9 pb$^{-1}$ electron positron annihilation sample at 4.0–4.6 GeV. With this large sample, new searches for exotic states and precise studies of line-shape during this energy region are performed. We present the measurements of cross sections with final states $\pi^{+} \pi^{-} \psi(2S)$, $K \bar{K} J/\psi$, $\pi^{+} \pi^{-} h_{c}$, $\pi^{+} \pi^{-} J/\psi$, $\gamma...
We report the recent results on the measurement of charmonium-like and bottomonium-like resonances at Belle. The report includes the first observation of $Z_{b}(10610) \to B^{*}B$ and $Z_{b}(10650) \to B^{*}B^{*}$ and studies of bottomonium-like state using $\Upsilon(5S)$ and $\Upsilon(6S)$ data taken at Belle. We also report measurements of $B$ decays to charmonium and charmonium-like states.
Discoveries of exotic hadrons in the past years increased the interest from both theory and experiments. Using the LHCb Run-I data, several exotic hadrons are observed or searched for, and some precision measurements of the properties are performed. In this talk the most recent results are reported.
The D0 collaboration has recently reported evidence for a possible four-quark state named $X(5568)$ in the decay sequence $X(5568) \rightarrow B_s^0 \pi^{\pm}$, $B_s^0 \rightarrow J/\psi \phi$. Here we present a progress report on our search for the $X(5568)$ with semileptonic decays of the $B_s^0$ meson. We also report on a search for a strange pentaquark decaying to a $J/\psi \Lambda$...
A wide program of studies of heavy flavour production in at LHC is performed with the ATLAS detector, including charm and beauty hadrons, quarkonia production in both sectors, and associated production $J/\psi + W$, $J/\psi + Z$ and, most recently, $J/\psi+ J/\psi$, which is the subject of this presentation.
The study is based on data collected at 8 TeV. The differential cross-section is...
In this talk, I will review how quarkonia and their associated production -despite the debates regarding their production mechanisms- can provide us with useful information on double parton scatterings, on gluon TMDs (both in polarised and unpolarised protons) and on the (nuclear) gluon PDFs.
For that, I will report on recent studies of the production of quarkonium pairs, quarkonium + vector...
Heavy flavor production is a sensitive probe of all stages in the evolution of a heavy ion collision system. The characterization of the relative weights of the corresponding mechanisms (like energy loss or suppression by collisions with initial partons or comovers) requires a detailed description of the production, from $p$+$p$ and $p$+$A$ to $A$+$A$ collisions. Heavy quarkonia could also be...
Beyond the study of the hot and dense matter created in heavy-ion collisions, the ALICE experiment at the LHC has a unique potential to study proton-proton collisions with the goal to probe the Quantum ChromoDynamics (QCD). ALICE is particularly well suited for the reconstruction of low transverse momentum particles and in this way to measure the bulk of the production cross section of...
Study of heavy quarkonium production cross-sections in $pp$ collisions provide important tests to our understanding of strong interactions. The LHCb experiment can contribute with results in unique kinematic range, low transverse momentum and large rapidity. In this talk recent results of heavy quarkonium production with the LHC Run 2 data will be presented.
The Upsilon states (1S, 2S, and 3S) produced in exclusive photoproduction in ultraperipheral collisions at the LHC energies are investigated. Predictions in the theoretical framework of the color dipole formalism are presented for proton-proton, proton-nucleus, and nucleus-nucleus for Run 2 LHC energies. The rapidity and transverse momentum distribution are calculated and compared with...
