112 research outputs found
Measurement of ϒ production in pp collisions at √s = 2.76 TeV
The production of ϒ(1S), ϒ(2S) and ϒ(3S)
mesons decaying into the dimuon final state is studied with
the LHCb detector using a data sample corresponding to an
integrated luminosity of 3.3 pb−1 collected in proton–proton
collisions at a centre-of-mass energy of √s = 2.76 TeV. The
differential production cross-sections times dimuon branching
fractions are measured as functions of the ϒ transverse
momentum and rapidity, over the ranges pT < 15 GeV/c
and 2.0 < y < 4.5. The total cross-sections in this kinematic
region, assuming unpolarised production, are measured to be
σ (pp → ϒ(1S)X) × B
ϒ(1S)→μ+μ−
= 1.111 ± 0.043 ± 0.044 nb,
σ (pp → ϒ(2S)X) × B
ϒ(2S)→μ+μ−
= 0.264 ± 0.023 ± 0.011 nb,
σ (pp → ϒ(3S)X) × B
ϒ(3S)→μ+μ−
= 0.159 ± 0.020 ± 0.007 nb,
where the first uncertainty is statistical and the second systematic
Study of the doubly charmed tetraquark T+cc
Quantum chromodynamics, the theory of the strong force, describes interactions of coloured quarks and gluons and the formation of hadronic matter. Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported of an exotic narrow state in the D0D0π+ mass spectrum just below the D*+D0 mass threshold produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The state is consistent with the ground isoscalar T+cc tetraquark with a quark content of ccu⎯⎯⎯d⎯⎯⎯ and spin-parity quantum numbers JP = 1+. Study of the DD mass spectra disfavours interpretation of the resonance as the isovector state. The decay structure via intermediate off-shell D*+ mesons is consistent with the observed D0π+ mass distribution. To analyse the mass of the resonance and its coupling to the D*D system, a dedicated model is developed under the assumption of an isoscalar axial-vector T+cc state decaying to the D*D channel. Using this model, resonance parameters including the pole position, scattering length, effective range and compositeness are determined to reveal important information about the nature of the T+cc state. In addition, an unexpected dependence of the production rate on track multiplicity is observed
analysis.ipynb from Even violins can cry: specifically vocal emotional behaviours also drive the perception of emotions in non-vocal music
Analysis code, as python noteboo
data.csv from Even violins can cry: specifically vocal emotional behaviours also drive the perception of emotions in non-vocal music
Experimental dat
UltraVISTA Catalogue Release DR1
VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'UltraVISTA: a new ultra-deep near-infrared survey in COSMOS.' (bibcode: 2012A&A...544A.156M
The COSMOS2015 catalog
VizieR online Data Catalogue associated with article published in journal Astronomical Journal (AAS) with title 'The COSMOS2015 catalog: exploring the
VLA-COSMOS 3 GHz Large Project
VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release.' (bibcode: 2017A&A...602A...1S
The ESO DIBs Large Exploration Survey
VizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'The ESO Diffuse Interstellar Bands Large Exploration Survey (EDIBLES). I. Project description, survey sample, and quality assessment.' (bibcode: 2017A&A...606A..76C
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