CERN Accelerating science

CERN Document Server 1,376 record trovati  1 - 10successivofine  salta al record: La ricerca ha impiegato 0.64 secondi. 
1.
First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–350 GeV / AMS Collaboration
A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8×106 positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼250  GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. [...]
2013 - 10 p. - Published in : Phys. Rev. Lett. 110 (2013) 141102 External links: Interactions.org article; Symmetry Magazine article; Press Release
2.
Nuclear modification of $\Upsilon$ states in pPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV / CMS Collaboration
Production cross sections of $\Upsilon$(1S), $\Upsilon$(2S), and $\Upsilon$(3S) states decaying into ${\mu^{+}\mu^{-}}$ in proton-lead (pPb) collisions are reported using data collected by the CMS experiment at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV. A comparison is made with corresponding cross sections obtained with pp data measured at the same collision energy and scaled by the Pb nucleus mass number. [...]
arXiv:2202.11807; CMS-HIN-18-005; CERN-EP-2020-181; CMS-HIN-18-005-004.- Geneva : CERN, 2022-08-28 - 40 p. - Published in : Phys. Lett. B 835 (2022) 137397 Fulltext: 2202.11807 - PDF; jt - PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF; External link: Fermilab Library Server
3.
First measurement of large area jet transverse momentum spectra in heavy-ion collisions / CMS Collaboration
Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to integrated luminosities of 404 $\mu$b$^{-1}$ and 27.4 pb$^{-1}$, respectively. Jets with different areas are reconstructed using the anti-$k_{\mathrm{T}}$ algorithm by varying the distance parameter $R$. [...]
arXiv:2102.13080; FERMILAB-PUB-21-160-CMS; CMS-HIN-18-014; CERN-EP-2020-226; CMS-HIN-18-014-004.- Geneva : CERN, 2021-05-31 - 48 p. - Published in : JHEP 2105 (2021) 284 Article from SCOAP3: PDF; Fulltext: PDF; External links: Additional information for the analysis; CMS AuthorList
4.
Evidence for X(3872) in Pb-Pb Collisions and Studies of its Prompt Production at $\sqrt {s_{NN}}$=5.02  TeV / CMS Collaboration
The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (PpPb) collisions at a center-of-mass energy of ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $ 5.02 TeV per nucleon pair, using the decay chain ${\mathrm{X}(3872)} \to \mathrm{J}/\psi\,\pi^{+}\pi^{-}\to \mu^{+}\mu^{-}\pi^{+}\pi^{-}$. [...]
arXiv:2102.13048; CMS-HIN-19-005; CERN-EP-2021-023; CMS-HIN-19-005-003.- Geneva : CERN, 2022-01-19 - 18 p. - Published in : Phys. Rev. Lett. 128 (2022) 032001 Fulltext: PDF; Fulltext from Publisher: PDF; External links: Additional information for the analysis; CMS AuthorList
5.
The Alpha Magnetic Spectrometer (AMS) on the International Space Station. I: Results from the test flight on the space shuttle / AMS Collaboration
The Alpha Magnetic Spectrometer (AMS) was flown on the space shuttle Discovery during flight STS-91 (June 1998) in a 51.7° orbit at altitudes between 320 and 390 km . A search for antihelium nuclei in the rigidity range 1– 140 GV was performed. [...]
2002 - 75 p. - Published in : Phys. Rep. 366 (2002) 331-405
- Published in : Phys. Rep. 380 (2003) 97-98
6.
Measurement of prompt ${\mathrm{D^0}}$ and ${\mathrm{\overline{D}}{}^0}$ meson azimuthal anisotropy and search for strong electric fields in PbPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} = $5.02 TeV / CMS Collaboration
The strong Coulomb field created in ultrarelativistic heavy ion collisions is expected to produce a rapidity-dependent difference ($\Delta v_{2}$) in the second Fourier coefficient of the azimuthal distribution (elliptic flow, $v_{2}$) between ${\mathrm{D^0}}$ ($\mathrm{\bar{u}}\mathrm{c}$) and ${\mathrm{\overline{D}}{}^0}$ ($\mathrm{u}\mathrm{\bar{c}}$) mesons. Motivated by the search for evidence of this field, the CMS detector at the LHC is used to perform the first measurement of $\Delta v_{2}$. [...]
arXiv:2009.12628; CMS-HIN-19-008; CERN-EP-2020-155; CMS-HIN-19-008-003.- Geneva : CERN, 2021-05-10 - 25 p. - Published in : Phys. Lett. B 816 (2021) 136253 Article from SCOAP3: PDF; Fulltext: PDF; External links: Additional information for the analysis; CMS AuthorList
7.
Studies of charm and beauty hadron long-range correlations in pp and pPb collisions at LHC energies / CMS Collaboration
Measurements of the second Fourier harmonic coefficient ($v_2$) of the azimuthal distributions of prompt and nonprompt ${\mathrm{D^0}}$ mesons (the latter coming from beauty hadron decays) produced in pp and pPb collisions are presented. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. [...]
arXiv:2009.07065; CMS-HIN-19-009; CERN-EP-2020-141; CMS-HIN-19-009-003.- Geneva : CERN, 2021-02-10 - 37 p. - Published in : Phys. Lett. B 813 (2021) 136036 Article from SCOAP3: PDF; Fulltext: PDF; External links: Additional information for the analysis; CMS AuthorList
8.
Measurements of the W boson rapidity, helicity, double-differential cross sections, and charge asymmetry in pp collisions at 13 TeV / CMS Collaboration
The differential cross section and charge asymmetry for inclusive W boson production at $\sqrt{s} = $ 13 TeV is measured for the two transverse polarization states as a function of the W boson absolute rapidity. The measurement uses events in which a W boson decays to a neutrino and either a muon or an electron. [...]
arXiv:2008.04174; CMS-SMP-18-012; CERN-EP-2020-116; CMS-SMP-18-012-003.- Geneva : CERN, 2020-11-30 - 50 p. - Published in : Phys. Rev. D 102 (2020) 092012 Article from SCOAP3: PDF; Fulltext: PDF; External links: Additional information for the analysis; CMS AuthorList
9.
Investigation into the event-activity dependence of $\Upsilon(\text{nS})$ relative production in proton-proton collisions at $\sqrt{s} = $ 7 TeV / CMS Collaboration
The ratios of the production cross sections between the excited $\Upsilon\text{(2S)}$ and $\Upsilon\text{(3S)}$ mesons and the $\Upsilon\text{(1S)}$ ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. The data are from proton-proton collisions at $\sqrt{s} = $ 7 TeV, corresponding to an integrated luminosity of 4.8 fb$^{-1}$, collected with the CMS detector at the LHC. [...]
arXiv:2007.04277; CMS-BPH-14-009; CERN-EP-2020-075; CMS-BPH-14-009-003.- Geneva : CERN, 2020-11-02 - 35 p. - Published in : JHEP 2011 (2020) 001 Article from SCOAP3: PDF; Fulltext: PDF; External links: Additional information for the analysis; CMS AuthorList
10.
Measurement of the inclusive and differential Higgs boson production cross sections in the leptonic WW decay mode at $\sqrt{s} = $ 13 TeV / CMS Collaboration
Measurement of the fiducial inclusive and differential production cross sections of the Higgs boson in proton-proton collisions at $\sqrt{s} = $ 13 TeV are performed using events where the Higgs boson decays into a pair of W bosons that subsequently decay into a final state with an electron, a muon, and a pair of neutrinos. The analysis is based on data collected with the CMS detector at the LHC during 2016-2018, corresponding to an integrated luminosity of 137 fb$^{-1}$. [...]
arXiv:2007.01984; CMS-HIG-19-002; CERN-EP-2020-106; CMS-HIG-19-002-003.- Geneva : CERN, 2021-03-01 - 48 p. - Published in : JHEP 2103 (2021) 003 Article from SCOAP3: PDF; Fulltext: PDF; External links: Additional information for the analysis; CMS AuthorList

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