Measurement of LEP beam energy by resonant spin depolarization

Arnaudon, L; Knudsen, Line Gry; Koutchouk, J. P.; Olsen, Roar A.; Placidi, M.; Schmidt, R.; Crozon, M.; Blondel, A.; Abmann, R.; Dehning, B.

doi:10.1016/0370-2693(92)90457-f

Cited by 51 publications

(45 citation statements)

References 14 publications

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“…A technique unique to e + e − rings, called resonant spin depolarization [33], can therefore be used to measure the beam energy with high precision. This technique was developed and successfully used during the LEP1 programme, and allowed the average beam energy to be known with a precision of 1 MeV.…”

Section: Beam Energy Measurementmentioning

confidence: 99%

First look at the physics case of TLEP

Biçer¹,

Yıldız²,

Yıldız³

et al. 2014

J. High Energ. Phys.

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493

616

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Abstract:The discovery by the ATLAS and CMS experiments of a new boson with mass around 125 GeV and with measured properties compatible with those of a Standard-Model Higgs boson, coupled with the absence of discoveries of phenomena beyond the Standard Model at the TeV scale, has triggered interest in ideas for future Higgs factories. A new circular e + e − collider hosted in a 80 to 100 km tunnel, TLEP, is among the most attractive solutions proposed so far. It has a clean experimental environment, produces high luminosity for top-quark, Higgs boson, W and Z studies, accommodates multiple detectors, and can reach energies up to the tt threshold and beyond. It will enable measurements of the Higgs boson properties and of Electroweak Symmetry-Breaking (EWSB) parameters with unequalled precision, offering exploration of physics beyond the Standard Model in the multi-TeV range. Moreover, being the natural precursor of the VHE-LHC, a 100 TeV hadron machine in the same tunnel, it builds up a long-term vision for particle physics. Altogether, the combination of TLEP and the VHE-LHC offers, for a great cost effectiveness, the best precision and the best search reach of all options presently on the market. This paper presents a first appraisal of the salient features of the TLEP physics potential, to serve as a baseline for a more extensive design study.

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Section: Beam Energy Measurementmentioning

confidence: 99%

First look at the physics case of TLEP

Biçer¹,

Yıldız²,

Yıldız³

et al. 2014

J. High Energ. Phys.

Self Cite

493

616

View full text Add to dashboard Cite

show abstract

“…Tidal forces from the Moon and the Sun also alter the beam energies, as discussed in reference [11]. These forces lead to timedependent deformations in the shape of the Earth and are expected to cause relative c hanges of the circumference, C, of LEP by a few 10 8 The six depolarization measurements of the beam energy are shown in gure 2 as a function of the tidal force normalized between -1 and 1. A strong correlation is observed and is conrmed by a controlled experiment performed during the 1992 running period of LEP [12].…”

Section: Stability Of the Beam Energy Over Timementioning

confidence: 98%

“…Towards the end of the 1991 data taking period, transversely polarized electrons at a nominal energy of 46.5 GeV were depolarized in a controlled way b y applying an oscillating horizontal magnetic eld [8]. Under the inuence of such a w eak eld the spins are slightly rotated away from the vertical axis on each turn, and a depolarizing resonance occurs if the depolarizing eld is in phase with the spin precession [9].…”

Section: Energy Calibration By Resonant Depolarizationmentioning

confidence: 99%

Measurement of the mass of the Z boson and the energy calibration of LEP

Arnaudon¹,

Billan²,

Birr³

et al. 1993

Physics Letters B

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“…The energy calibration of LEP The absolute energy scale of LEP has been calibrated in 1991 [26] using the measurements done with a controlled spin-depolarizing resonance on the vertically polarized beam [27] as main tool. Transverse polarization has been observed using a laser polarimeter during eight dedicated experiments with a level between 5% and 16% under special conditions, distinct from those of the physics runs and at a single nominal energy setting.…”

Section: CCmentioning

confidence: 99%