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Grace in all simplicity : beauty, truth, and wonders on the path to the Higgs boson and new laws of nature
\"Grace in All Simplicity narrates the saga of how we have prospected for some of Nature's most tightly held secrets, the basic constituents of matter and the fundamental forces that rule them. Our current understanding of the world (and universe) we inhabit is the result of curiosity, diligence, and daring, of abstraction and synthesis, and of an abiding faith in the value of exploration. In these pages we will meet scientists of both past and present. These men and women are professional scientists and amateurs, the eccentric and the conventional, performers and introverts\"-- Provided by publisher.
Book
Exploring the Υ ( 6 S ) → χ b J ϕ and Υ ( 6 S ) → χ b J ω hidden-bottom hadronic transitions
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image)In this work, we investigate the hadronic loop contributions to the ... along with ... transitions. We predict that the branching ratios of ..., ... and ... are (0.68–4.62) ..., (0.50–3.43) ..., and (2.22–15.18) ..., respectively, and those of ..., ... and ... are (0.15–2.81) ..., (0.63–11.68) ..., and (1.08–20.02) ..., respectively. Especially, some typical ratios, which reflect the relative magnitudes of the predicted branching ratios, are given, i.e., for ... transitions, ..., ..., and ..., and for ... transitions, ..., ..., and ... With the running of BelleII in the near future, experimental measurement of these two kinds of transitions will be a potential research issue.
Journal Article
Searches for the Zγ decay mode of the Higgs boson and for new high-mass resonances in pp collisions at √s = 13 TeV with the ATLAS detector
A
bstract
This article presents searches for the Zγ decay of the Higgs boson and for narrow high-mass resonances decaying to
Z
γ, exploiting
Z
boson decays to pairs of electrons or muons. The data analysis uses 36.1 fb
−1
of
pp
collisions at
s
=
13
recorded by the ATLAS detector at the CERN Large Hadron Collider. The data are found to be consistent with the expected Standard Model background. The observed (expected — assuming Standard Model
pp
→
H
→
Z
γ production and decay) upper limit on the production cross section times the branching ratio for
pp
→
H
→
Z
γ is 6.6. (5.2) times the Standard Model prediction at the 95% confidence level for a Higgs boson mass of 125.09 GeV. In addition, upper limits are set on the production cross section times the branching ratio as a function of the mass of a narrow resonance between 250 GeV and 2.4 TeV, assuming spin-0 resonances produced via gluon-gluon fusion, and spin-2 resonances produced via gluon-gluon or quark-antiquark initial states. For high-mass spin-0 resonances, the observed (expected) limits vary between 88 fb (61 fb) and 2.8 fb (2.7 fb) for the mass range from 250 GeV to 2.4 TeV at the 95% confidence level.
Journal Article
Search for squarks and gluinos in final states with jets and missing transverse momentum using 139 fb(-1) of √s=13 TeV pp collision data with the ATLAS detector
A search for the supersymmetric partners of quarks and gluons (squarks and gluinos) in final states containing jets and missing transverse momentum, but no electrons or muons, is presented. The data used in this search were recorded by the ATLAS experiment in proton-proton collisions at a centre-of-mass energy of root s = 13 TeV during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb(-1). The results are interpreted in the context of various R-parity-conserving models where squarks and gluinos are produced in pairs or in association and a neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% confidence level on the mass of the gluino is set at 2.30 TeV for a simplified model containing only a gluino and the lightest neutralino, assuming the latter is massless. For a simplified model involving the strong production of mass-degenerate first- and second-generation squarks, squark masses below 1.85 TeV are excluded if the lightest neutralino is massless. These limits extend substantially beyond the region of supersymmetric parameter space excluded previously by similar searches with the ATLAS detector.
Journal Article
Chemical freeze-out of light nuclei in high energy nuclear collisions and resolution of the hyper-triton chemical freeze-out puzzle
We present a summary of the recent results obtained with the novel hadron resonance gas model with the multicomponent hard-core repulsion which is extended to describe the mixtures of hadrons and light (anti-, hyper-)nuclei. A very accurate description is obtained for the hadronic and the light nuclei data measured by STAR at the collision energy sNN=200GeV and by ALICE at sNN=2.76TeV. The most striking result discussed here is that for the most probable chemical freeze-out scenario for the STAR energy the found parameters allow us to reproduce the values of the experimental ratios S3 and S¯3 without fitting.
Journal Article
Exotic hadrons from BESIII
We report the progress in the study of the exotic hadrons, also called XYZ states, at BESIII experiment with its unique data samples in e + e − annihilation at center-of-mass energies of 3.8–4.6 GeV. The talk covers the observation of the Z c (3900) and Z c (4020) and new measurements related to them; updated measurement of the resonant parameters of the Y (4260) in e + e − → π + π − J /ψ and discovery of its new decay modes π + π − ψ(2 S ), ωχ c 0, π + π − h c , and D 0 D ∗− π + + c.c. ; and observation of X (3872) in e + e − annihilation.
Journal Article
Measurement of the W boson mass
A
bstract
The
W
boson mass is measured using proton-proton collision data at
s
= 13 TeV corresponding to an integrated luminosity of 1.7 fb
−
1
recorded during 2016 by the LHCb experiment. With a simultaneous fit of the muon
q/p
T
distribution of a sample of
W
→
μν
decays and the
ϕ
*
distribution of a sample of
Z
→
μμ
decays the
W
boson mass is determined to be
m
w
=
80354
±
23
stat
±
10
exp
±
17
theory
±
9
PDF
MeV
,
where uncertainties correspond to contributions from statistical, experimental systematic, theoretical and parton distribution function sources. This is an average of results based on three recent global parton distribution function sets. The measurement agrees well with the prediction of the global electroweak fit and with previous measurements.
Journal Article
Measurement of the forward-backward asymmetry of electron and muon pair-production in pp collisions at √s = 7 TeV with the ATLAS detector
A
bstract
This paper presents measurements from the ATLAS experiment of the forward-backward asymmetry in the reaction
pp
→
Z/γ
*
→
l
+
l
−
, with
l
being electrons or muons, and the extraction of the effective weak mixing angle. The results are based on the full set of data collected in 2011 in
pp
collisions at the LHC at
s
=
7
TeV, corresponding to an integrated luminosity of 4.8 fb
−1
. The measured asymmetry values are found to be in agreement with the corresponding Standard Model predictions. The combination of the muon and electron channels yields a value of the effective weak mixing angle of sin
2
θ
eff
lept
= 0.2308 ± 0.0005(stat.) ± 0.0006(syst.) ± 0.0009(PDF), where the first uncertainty corresponds to data statistics, the second to systematic effects and the third to knowledge of the parton density functions. This result agrees with the current world average from the Particle Data Group fit.
Journal Article
A method for correcting the substructure of multiprong jets using the Lund jet plane
Many analyses at the CERN LHC exploit the substructure of jets to identify heavy resonances produced with high momenta that decay into multiple quarks and/or gluons. This paper presents a new technique for correcting the substructure of simulated large-radius jets from multiprong decays. The technique is based on reclustering the jet constituents into several subjets such that each subjet represents a single prong, and separately correcting the radiation pattern in the Lund jet plane of each subjet using a correction derived from data. The data presented here correspond to an integrated luminosity of 138 fb−1 collected by the CMS experiment between 2016–2018 at a center-of-mass energy of 13 TeV. The correction procedure improves the agreement between data and simulation for several different substructure observables of multiprong jets. This technique establishes, for the first time, a robust calibration for the substructure of jets with four or more prongs, enabling future measurements and searches for new phenomena containing these signatures.
Journal Article
Search for top squarks in final states with many light-flavor jets and 0, 1, or 2 charged leptons in proton-proton collisions at $\\sqrt{s}=13$ TeV
Several new physics models including versions of supersymmetry (SUSY) characterized by R-parity violation (RPV) or with additional hidden sectors predict the production of events with top quarks, low missing transverse momentum, and many additional quarks or gluons. The results of a search for top squarks decaying to two top quarks and six additional light-flavor quarks or gluons are reported. The search employs a novel machine learning method for background estimation from control samples in data using decorrelated discriminators. The search is performed using events with 0, 1, or 2 electrons or muons in conjunction with at least six jets. No requirement is placed on the magnitude of the missing transverse momentum. The result is based on a sample of proton-proton collisions at $\\sqrt{s}=13$ TeV corresponding to 138 fb−1 of integrated luminosity collected with the CMS detector at the LHC in 2016–2018. With no statistically significant excess of events observed beyond the expected contributions from the standard model, the data are used to determine upper limits on the top squark pair production cross section in the frameworks of RPV and stealth SUSY. Models with top squark masses less than 700 (930) GeV are excluded at 95% confidence level for RPV (stealth) SUSY scenarios.
Journal Article