DEPOLARIZATION AND LUMINOSITY ISSUES IN A HIGH ENERGY LINEAR COLLIDER

2000 ◽  
Vol 15 (16) ◽  
pp. 2555-2564
Author(s):  
S. CHESHKOV ◽  
T. TAJIMA
Keyword(s):  
Linear Collider ◽  
Center Of Mass ◽  
High Energy ◽  
Collision Point ◽  
Single Beam ◽  
Center Of Mass Energy ◽  
Electron Positron ◽  
Spin Depolarization ◽  
Positron Beams ◽  
Energy Frontier

In the next energy frontier of an electron–positron (electron–electron) linear collider its demand of both extreme high energy and high luminosity leads to a high production of W+W- (W- particles). In order to delineate processes of interest, it is advantageous to polarize the electron and positron beams, as this tends to suppress the above known processes and thus heightens the sensitivity to the sought-after processes. We investigate the possible depolarization of the electron (positron) beams in the acceleration stages as well as in the collision point. We take the example of the laser wakefield accelerator design at 5 TeV center of mass energy of colliding beams. We find that in this design the spin depolarization due to the stage jitter noise is certainly negligible, and the depolarization due to the self-generated fields at the collision point is still tolerable. We also consider several lower energy scenarios as they might be possible to achieve in a single beam driven acceleration stage.

scholarly journals PROGRESS WITH THE JLC/NLC X-BAND LINEAR COLLIDER DESIGN

2001 ◽  
Vol 16 (supp01c) ◽  
pp. 1193-1196
Author(s):  
T. O. Raubenheimer
Keyword(s):  
Linear Collider ◽  
Center Of Mass ◽  
Cost Savings ◽  
Significant Cost ◽  
Center Of Mass Energy ◽  
Physics Program ◽  
Electron Positron ◽  
X Band ◽  
Beam Delivery ◽  
Beam Delivery System

An electron/positron linear collider with a center-of-mass energy between 0.5 and 1 TeV would be an important complement to the physics program of the LHC in the next decade. The Next Linear Collider (NLC) is being designed by a US collaboration (FNAL, LBNL, LLNL, and SLAC) which is working closely with the Japanese collaboration that is designing the Japanese Linear Collider (JLC). This paper will discuss the technical difficulties encountered as well as the changes that have been made to the NLC design over the last year. These changes include improvements to the X-band rf system as well as modifications to the beam delivery system. The net effect has been to reduce the length of the collider from about 32 km to 25 km and to reduce the number of klystrons and modulators by a factor of two. Together these lead to significant cost savings.

scholarly journals The future of the Large Hadron Collider and CERN

2012 ◽  
Vol 370 (1961) ◽  
pp. 986-994 ◽  
Author(s):  
Rolf-Dieter Heuer
Keyword(s):  
Large Hadron Collider ◽  
Particle Physics ◽  
Linear Collider ◽  
Hadron Collider ◽  
International Linear Collider ◽  
High Energy ◽  
Scientific Programme ◽  
Electron Positron ◽  
To Come ◽  
Energy Frontier

This paper presents the Large Hadron Collider (LHC) and its current scientific programme and outlines options for high-energy colliders at the energy frontier for the years to come. The immediate plans include the exploitation of the LHC at its design luminosity and energy, as well as upgrades to the LHC and its injectors. This may be followed by a linear electron–positron collider, based on the technology being developed by the Compact Linear Collider and the International Linear Collider collaborations, or by a high-energy electron–proton machine. This contribution describes the past, present and future directions, all of which have a unique value to add to experimental particle physics, and concludes by outlining key messages for the way forward.

scholarly journals SppC Based Energy Frontier Lepton-Proton Colliders: Luminosity and Physics

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Ali Can Canbay ◽  
Umit Kaya ◽  
Bora Ketenoglu ◽  
Bilgehan Baris Oner ◽  
Saleh Sultansoy
Keyword(s):  
Linear Collider ◽  
Center Of Mass ◽  
International Linear Collider ◽  
Mass Energy ◽  
Proton Proton ◽  
Center Of Mass Energy ◽  
Wake Field ◽  
Bsm Physics ◽  
Beam Parameters ◽  
Energy Frontier

Main parameters of Super proton-proton Collider (SppC) based lepton-proton colliders are estimated. For electron beam parameters, highest energy International Linear Collider (ILC) and Plasma Wake Field Accelerator-Linear Collider (PWFA-LC) options are taken into account. For muon beams, 1.5 TeV and 3 TeV center of mass energy muon collider parameters are used. In addition, ultimate μp collider which assumes construction of additional 50 TeV muon ring in the SppC tunnel is considered. It is shown that luminosity values exceeding 1032 cm-2 s-1 can be achieved with moderate upgrade of the SppC proton beam parameters. Physics search potential of proposed lepton-proton colliders is illustrated by considering small Björken x region as an example of SM physics and resonant production of color octet leptons as an example of BSM physics.

Novel laser-plasma TeV electron-positron linear colliders

2019 ◽  
Vol 34 (34) ◽  
pp. 1943003 ◽  
Author(s):  
Kazuhisa Nakajima ◽  
Jonathan Wheeler ◽  
Gérard Mourou ◽  
Toshiki Tajima
Keyword(s):  
Laser Plasma ◽  
Linear Collider ◽  
Center Of Mass ◽  
Radiation Reaction ◽  
Particle Beam ◽  
Moderate Intensity ◽  
Center Of Mass Energy ◽  
Multiple Coulomb Scattering ◽  
Electron Positron ◽  
Linear Colliders

TeV center-of-mass energy electron-positron linear colliders comprising seamlessly staged capillary laser-plasma accelerators are presented. A moderate intensity laser pulse coupled with the single electromagnetic hybrid mode in a gas-filled capillary can generate plasma waves in the linear regime, where laser wakefields can accelerate equally focused electron and positron beams. In multiple stage capillary accelerators, a particle beam with respect to the laser wakefield can undergo consecutive acceleration up to TeV energies, associated with continuous transverse focusing in a beam size down to a nanometer level, being capable of a promising electron-positron linear collider with very high luminosities of the order of 10[Formula: see text] cm[Formula: see text]s[Formula: see text]. The transverse and longitudinal beam dynamics of beam particles in plasma wakefields with the effects of radiation reaction and multiple Coulomb scattering are investigated numerically to estimate the luminosities in beam-beam collisions with the effects of beamstrahlung radiation and bunch disruption.

CEPC booster design study

2017 ◽  
Vol 32 (34) ◽  
pp. 1746009
Author(s):  
Tianjian Bian ◽  
Jie Gao ◽  
Chuang Zhang ◽  
Xiao-Hao Cui ◽  
Yi-Wei Wang ◽  
...  
Keyword(s):  
Beam Energy ◽  
Center Of Mass ◽  
High Energy ◽  
Low Energy ◽  
Mass Energy ◽  
Dipole Magnet ◽  
Center Of Mass Energy ◽  
The Earth ◽  
Electron Positron ◽  
Normal Ring

In September 2012, Chinese scientists proposed a Circular Electron Positron Collider (CEPC) in China at 240 GeV center-of-mass energy for Higgs studies. The booster provides 120 GeV electron and positron beams to the CEPC collider for top-up injection at 0.1 Hz. The design of the full energy booster ring of the CEPC is a challenge. The ejected beam energy is 120 GeV and the injected beam energy is 6 GeV. In this paper we describe two alternative schemes, the wiggler bend scheme and the normal bend scheme. For the wiggler bend scheme, we propose to operate the booster ring as a large wiggler at low energy and as a normal ring at high energy to avoid the problem of very low dipole magnet fields. For the normal bend scheme, we implement the orbit correction to correct the earth field.

scholarly journals Search for Anomalous Quartic ZZγγ Couplings in Photon-Photon Collisions

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
M. Köksal ◽  
V. Arı ◽  
A. Senol
Keyword(s):  
Linear Collider ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Energy Scale ◽  
Mass Energy ◽  
Abelian Gauge ◽  
Center Of Mass Energy ◽  
High Energy Scale ◽  
Integrated Luminosity

The self-couplings of the electroweak gauge bosons are completely specified by the non-Abelian gauge nature of the Standard Model (SM). The direct study of these couplings provides a significant opportunity to test the validity of the SM and the existence of new physics beyond the SM up to the high energy scale. For this reason, we investigate the potential of the processes γγ→ZZ, e-γ→e-γ⁎γ→e-ZZ,  and e+e-→e+γ⁎γ⁎e-→e+ZZe- to examine the anomalous quartic couplings of ZZγγ vertex at the Compact Linear Collider (CLIC) with center-of-mass energy 3 TeV. We calculate 95% confidence level sensitivities on the dimension-8 parameters with various values of the integrated luminosity. We show that the best bounds on the anomalous fM2/Λ4, fM3/Λ4, fT0/Λ4, and fT9/Λ4 couplings arising from γγ→ZZ process among those three processes at center-of-mass energy of 3 TeV and integrated luminosity of Lint=2000 fb−1 are found to be [-3.30;3.30]×10-3 TeV−4, [-1.20;1.20]×10-2 TeV−4, [-3.40;3.40]×10-3 TeV−4, and [-1.80;1.80]×10-3 TeV−4, respectively.

scholarly journals Search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c.

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
◽  
M. Ablikim ◽  
M. N. Achasov ◽  
P. Adlarson ◽  
S. Ahmed ◽  
...  
Keyword(s):  
Confidence Level ◽  
Branching Fraction ◽  
Center Of Mass ◽  
Leptonic Decay ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Upper Limit ◽  
Electron Positron

Abstract Using 10.1 × 109J/ψ events produced by the Beijing Electron Positron Collider (BEPCII) at a center-of-mass energy $$ \sqrt{s} $$ s = 3.097 GeV and collected with the BESIII detector, we present a search for the rare semi-leptonic decay J/ψ → D−e+νe + c.c. No excess of signal above background is observed, and an upper limit on the branching fraction ℬ(J/ψ → D−e+νe + c. c.) < 7.1 × 10−8 is obtained at 90% confidence level. This is an improvement of more than two orders of magnitude over the previous best limit.

INTERMITTENCY PATTERNS IN PROTON-NUCLEUS INTERACTIONS AT HIGH ENERGY

1993 ◽  
Vol 08 (40) ◽  
pp. 3853-3859 ◽  
Author(s):  
D. K. MAITY ◽  
P. K. BANERJEE ◽  
B. B. DAS ◽  
D. RAVINDRAN ◽  
D. K. BHATTACHARJEE
Keyword(s):  
Power Law ◽  
Quark Gluon Plasma ◽  
Center Of Mass ◽  
Gluon Plasma ◽  
High Energy ◽  
Mass Energy ◽  
Factorial Moments ◽  
Center Of Mass Energy

A study of intermittency in hadron-nucleus and the comparison with nucleus-nucleus interactions is presented. The power law behavior of the factorial moments and the variation of intermittency index with the center-of-mass energy are shown. Results favor the formation of quark-gluon plasma in preference to a cascade mechanism.

High(est) energy lepton colliders

2021 ◽  
pp. 2142016
Author(s):  
Roberto Franceschini
Keyword(s):  
Standard Model ◽  
Center Of Mass ◽  
High Energy ◽  
New Physics ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Lepton Colliders ◽  
The Standard Model

We discuss the physics opportunities and challenges presented by high energy lepton colliders in the range of center-of-mass energy between few and several tens of TeV. The focus is on the progress attainable on the study of weak and Higgs interactions in connection with new physics scenarios motivated by the shortcomings of the Standard Model.

scholarly journals High-energy resummation in heavy-quark pair hadroproduction

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
A. D. Bolognino ◽  
Francesco Giovanni Celiberto ◽  
M. Fucilla ◽  
D. Yu. Ivanov ◽  
A. Papa
Keyword(s):  
Heavy Quark ◽  
Cross Section ◽  
Center Of Mass ◽  
High Energy ◽  
Heavy Quarks ◽  
Mass Energy ◽  
Center Of Mass Energy ◽  
Large Separation ◽  
Bfkl Approach ◽  
Heavy Quark Pair

AbstractThe inclusive hadroproduction of two heavy quarks, featuring a large separation in rapidity, is proposed as a novel probe channel of the Balitsky–Fadin–Kuraev–Lipatov (BFKL) approach. In a theoretical setup which includes full resummation of leading logarithms in the center-of-mass energy and partial resummation of the next-to-leading ones, predictions for the cross section and azimuthal coefficients are presented for kinematic configurations typical of current and possible future experimental analyses at the LHC.

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