CERN Accelerating science

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2017-06-24
09:59
Status of the Charged Higgs Boson in Two Higgs Doublet Models / Arbey, A. ; Mahmoudi, F. ; Stal, O. ; Stefaniak, T.
The existence of charged Higgs boson(s) is inevitable in models with two (or more) Higgs doublets. Hence, their discovery would constitute unambiguous evidence for new physics beyond the Standard Model (SM). [...]
CERN-TH-2017-137; SCIPP-17-07; arXiv:1706.07414.- 2017-06-22 - 35 p. Fulltext: PDF;

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2017-06-24
09:59
Prompt and nonprompt J/$\psi$ production and nuclear modification in $p$Pb collisions at $\sqrt{s_{\text{NN}}}= 8.16$ TeV / LHCb Collaboration
The production of J/$\psi$ mesons is studied in proton-lead collisions at the centre-of-mass energy per nucleon pair $\sqrt{s_{\text{NN}}}=8.16$ TeV with the LHCb detector at the LHC. The double differential cross-sections of prompt and nonprompt J/$\psi$ production are measured as functions of the J/$\psi$ transverse momentum and rapidity in the nucleon-nucleon centre-of-mass frame. [...]
arXiv:1706.07122.- 2017-06-21 Fulltext: PDF;

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2017-06-24
09:59
A determination of the fragmentation functions of pions, kaons, and protons with faithful uncertainties / Bertone, Valerio ; Carrazza, Stefano ; Hartland, Nathan P. ; Nocera, Emanuele R. ; Rojo, Juan
We present NNFF1.0, a new determination of the fragmentation functions (FFs) of charged pions, charged kaons, and protons/antiprotons from an analysis of single-inclusive hadron production data in electron-positron annihilation. This determination, performed at leading, next-to-leading, and next-to-next-to-leading order in perturbative QCD, is based on the NNPDF methodology, a fitting framework designed to provide a statistically sound representation of FF uncertainties and to minimise any procedural bias. [...]
CERN-TH-2017-122; OUTP-16-15P; NIKHEF-2016-047; arXiv:1706.07049.- 2017-06-21 - 50 p. Fulltext: PDF;

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2017-06-24
09:59
Study of charmonium production in $b$-hadron decays and first evidence for the decay $B_s \rightarrow \phi \phi \phi$ / LHCb Collaboration
Using decays to $\phi$-meson pairs, the inclusive production of charmonium states in $b$-hadron decays is studied with $pp$ collision data corresponding to an integrated luminosity of $3.0fb^{-1}$, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by $B_C\equiv B(b\to CX)\times B(C\to\phi\phi)$ the inclusive branching fraction of a $b$ hadron to a charmonium state $C$ that decays into a pair of $\phi$ mesons, ratios $R^{C1}_{C2}\equiv B_{C1}/B_{C2}$ are determined as $R^{\chi_{c0}}_{\eta_c(1S)}=0.147\pm0.023\pm0.011$, $R^{\chi_{c1}}_{\eta_c (1S)}=0.073\pm0.016\pm0.006$, $R^{\chi_{c2}}_{\eta_c (1S)}=0.081\pm0.013\pm0.005$, $R^{\chi_{c1}}_{\chi_{c0}}=0.50\pm0.11\pm0.01$, $R^{\chi_{c2}}_{\chi_{c0}}=0.56\pm0.10\pm0.01$ and $R^{\eta_c (2S)}_{\eta_c(1S)}=0.040\pm0.011\pm0.004$. [...]
LHCB-PAPER-2017-007; CERN-EP-2017-099; arXiv:1706.07013.- 2017-06-21 Fulltext: PDF;

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2017-06-24
09:59
High-Precision Calculations in Strongly Coupled Quantum Field Theory with Next-to-Leading-Order Renormalized Hamiltonian Truncation / Elias-Miro, Joan ; Rychkov, Slava ; Vitale, Lorenzo G.
Hamiltonian Truncation (a.k.a. Truncated Spectrum Approach) is an efficient numerical technique to solve strongly coupled QFTs in d=2 spacetime dimensions. [...]
CERN-TH-2017-132; arXiv:1706.06121.- 2017-06-19 - 7 p. Preprint: PDF;

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2017-06-24
09:59
Phase structure of complete asymptotically free SU($N_c$) theories with quarks and scalar quarks / Hansen, Frederik F. ; Janowski, Tadeusz ; Langaeble, Kasper ; Mann, Robert B. ; Sannino, Francesco ; Steele, Tom G. ; Wang, Zhi-Wei
We determine the phase diagram of complete asymptotically free SU($N_c$) gauge theories featuring $N_s$ complex scalars and $N_f$ Dirac quarks transforming according to the fundamental representation of the gauge group. The analysis is performed at the maximum known order in perturbation theory. [...]
CP3-ORIGINS-2017-022-DNRF90; CERN-TH-2017-133; arXiv:1706.06402.- 2017-06-20 - 37 p. Fulltext: PDF;

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2017-06-24
09:59
On the Catalysis of the Electroweak Vacuum Decay by Black Holes at High Temperature / Canko, D. (Athens Natl. Capodistrian U.) ; Gialamas, I. (Athens Natl. Capodistrian U.) ; Jelic-Cizmek, G. (Geneva U., Dept. Theor. Phys. ; Geneva U., CAP) ; Riotto, A. (Geneva U., Dept. Theor. Phys. ; Geneva U., CAP ; CERN ; CERN) ; Tetradis, N. (Athens Natl. Capodistrian U. ; Athens U. ; CERN ; Athens U. ; CERN ; Athens U. ; CERN)
We study the effect of primordial black holes on the classical rate of nucleation of AdS regions within the standard electroweak vacuum at high temperature. We find that the energy barrier for transitions to the new vacuum, which determines the exponential suppression of the nucleation rate, can be reduced significantly, or even eliminated completely, in the black-hole background if the Standard Model Higgs is coupled to gravity through the renormalizable term $\xi {\cal R} h^2$..
arXiv:1706.01364.- 2017-06-05 - 15 p. Fulltext: PDF;

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2017-06-22
17:07
Dark matter search in CMS / Vartak, Adish (UC, San Diego) /CMS Collaboration
The dark matter search program at the LHC covers a wide range of final states and targets a variety of possible interactions between dark matter and standard model particles. A summary of the dark matter searches performed at the CMS experiment, using proton-proton collision data collected at a center of energy of 13 TeV, is presented.Searches performed in various final states are described, and results interpreted in terms of several dark matter models are presented. [...]
CMS-CR-2017-147.- Geneva : CERN, 2017 - 10 p. Fulltext: PDF;
In : 52nd Rencontres de Moriond on Very High Energy Phenomena in the Universe, La Thuile, Italy, 18 - 25 Mar 2017

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2017-06-22
17:00
FPGA-based Real-time Charged Particle Trajectory Reconstruction at the Large Hadron Collider / Bartz, Edward Hugo (Rutgers U., Piscataway) ; Chaves, Jorge Enrique (Cornell U.) ; Gershtein, Yury (Rutgers U., Piscataway) ; Halkiadakis, Eva (Rutgers U., Piscataway) ; Hildreth, Michael (Notre Dame U.) ; Kyriacou, Savvas (Rutgers U., Piscataway) ; Lannon, Kevin Patrick (Notre Dame U.) ; Lefeld, Anthony James (Ohio State U.) ; Ryd, Anders Per Erik (Cornell U.) ; Skinnari, Louise (Cornell U.) et al.
The upgrades of the Compact Muon Solenoid particle physics experiment at CERN's Large Hadron Collider provide a major challenge for the real-time collision data selection. This paper presents a novel approach to pattern recognition and charged particle trajectory reconstruction using an all-FPGA solution. [...]
CMS-CR-2017-100.- Geneva : CERN, 2017 - 9 p. Fulltext: PDF;
In : 25th Annual International Symposium on Field-Programmable Custom Computing Machines, Napa, CA, USA, 30 Apr - 2 May 2017

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2017-06-22
10:51
Injection of the Lead Ion Beam for LHC into the PS / Martini, Michel (CERN)
CERN-PS-AE-Note-2001-012.
- 2001. - 11 p.
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