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Ultimi arrivi:
2021-01-28
04:23
Perspectives for quarkonium studies at the high-luminosity LHC / Chapon, Emilien (Beijing, Inst. High Energy Phys.) ; d'Enterria, David (CERN) ; Ducloue, Bertrand (Edinburgh U.) ; Echevarria, Miguel G. (Alcala de Henares U.) ; Gossiaux, Pol-Bernard (SUBATECH, Nantes) ; Kartvelishvili, Vato (Lancaster U.) ; Kasemets, Tomas (U. Mainz, PRISMA) ; Lansberg, Jean-Philippe (IJCLab, Orsay) ; McNulty, Ronan (University Coll., Dublin) ; Price, Darren D. (Manchester U.) et al.
We review the prospects for quarkonium-production studies in proton and nuclear collisions accessible during the upcoming phases of the CERN Large Hadron Collider operation after 2021, including the ultimate high-luminosity phase, with increased luminosities compared to LHC Runs 1 and 2. [...]
arXiv:2012.14161 ; MIT-CTP/5231 ; JLAB-THY-20-3240.
- 115 p.
JLAB - Fulltext

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2021-01-28
04:23
Photoproduction of the $f_2(1270)$ meson using the CLAS detector / CLAS Collaboration
The quark structure of the $f_2(1270)$ meson has, for many years, been assumed to be a pure quark-antiquark ($q\bar{q}$) resonance with quantum numbers $J^{PC} = 2^{++}$. [...]
arXiv:2010.16006 ; JLAB-PHY-20-3279.
- 6 p.
JLAB - Fulltext

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2021-01-28
04:23
High-resolution laser spectroscopy of $^{27-32}$Al / Heylen, H. (CERN ; Leuven U. ; Heidelberg, Max Planck Inst.) ; Devlin, C.S. (Liverpool U.) ; Gins, W. (Leuven U. ; Jyvaskyla U.) ; Bissell, M.L. (Manchester U.) ; Blaum, K. (Heidelberg, Max Planck Inst.) ; Cheal, B. (Liverpool U.) ; Filippin, L. (Brussels U.) ; Garcia Ruiz, R.F. (CERN ; Manchester U.) ; Godefroid, M. (Brussels U.) ; Gorges, C. (Darmstadt, Tech. U.) et al.
Hyperfine spectra of $^\text{27-32}$Al ($Z=13$) have been measured at the ISOLDE-CERN facility via collinear laser spectroscopy using the $3s^23p\ ^2\text{P}^\text{o} _{3/2}\rightarrow 3s^24s\ ^2\text{S}_{1/2}$ atomic transition. [...]
arXiv:2010.06918.
- 10 p.
Fulltext

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2021-01-27
18:53
Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a $\tau$-lepton in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
A search for pair production of third-generation scalar leptoquarks decaying into a top quark and a $\tau$-lepton is presented. [...]
CERN-EP-2020-241.
- 2021.
Fulltext - Previous draft version

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2021-01-27
06:31
Chapter 13: Beam instrumentation and long-range beam–beam compensation / Jones, R (CERN) ; Bravin, Enrico (CERN) ; Lefevre, Thibault (CERN) ; Veness, Raymond (CERN)
The extensive array of beam instrumentation with which the LHC is equipped has played a major role in its commissioning, rapid intensity ramp-up and safe and reliable operation. [...]
2020. - 14 p.
Fulltext

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2021-01-27
06:31
Chapter 2: Machine layout and performance / Arduini, G (CERN) ; Bruce, R (CERN) ; De Maria, R (CERN) ; Giovannozzi, M (CERN) ; Iadarola, G (CERN) ; Jowett, J (CERN) ; Métral, E (CERN) ; Papaphilippou, Y (CERN) ; Garcia, R Tomás (CERN)
The goal of the High-luminosity upgrade of the LHC is to deliver an integrated luminosity of at least 250 fb-1 per year (assuming at least 160 days of operation at high-luminosity) in each of the two high-luminosity general-purpose detectors, ATLAS and CMS, located at the interaction points (IP) 1 and 5, respectively. [...]
2020. - 30 p.
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2021-01-27
06:31
Chapter 1: High-Luminosity Large Hadron Collider / Brüning, O (CERN) ; Rossi, L (CERN ; U. Milan (main) ; LASA, Segrate)
The Large Hadron Collider (LHC) was successfully commissioned in 2010 for proton–proton collisions with a 7 TeV centre-of-mass (c.o.m.) energy. [...]
16 p.
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2021-01-27
06:31
Chapter 3: Insertion Magnets / Todesco, E (CERN) ; Ferracin, P (CERN)
In general, magnets will be tested individually in a vertical test station, and then horizontally in the final cold mass assembly within the final cryostat, with the exception of Q2 and D2 whose length does not allow vertical testing. [...]
2020. - 18 p.
Fulltext

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2021-01-27
06:31
Chapter 4: RF systems / Calaga, R (CERN) ; Baudrenghien, P (CERN) ; Capatina, Ofelia (CERN) ; Jensen, Erk (CERN) ; Montesinos, Eric (CERN)
The HL-LHC beams are injected, accelerated, and stored to their nominal energy of 7 TeV by the existing 400 MHz superconducting RF system of the LHC. A novel superconducting RF system consisting of eight cavities per beam for transverse deflection (aka crab cavities) of the bunches will be used to compensate the geometric loss in luminosity due to the non-zero crossing angle and the extreme focusing of the bunches in the HL-LHC. Due to doubling of the beam currents in the HL-LHC era, an optimal detuning scheme (aka full- detuning) is required to cope with the transient beam loading effects. [...]
2020. - 22 p.
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2021-01-27
06:31
Chapter 5: Collimation system / Redaelli, Stefano (CERN) ; Bruce, Roderik (CERN) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN)
A variety of processes can cause unavoidable beam losses during normal and abnormal beam operation. [...]
2020. - 27 p.
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