Towards a Muon Collider

A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work.Comment: 118 pages, 103 figure

Towards a muon collider

A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work

Hard color-singlet exchange in dijet events in proton-proton collisions at root s=13 TeV

Events where the two leading jets are separated by a pseudorapidity interval devoid of particle activity, known as jet-gap-jet events, are studied in proton-proton collisions at root s = 13 TeV. The signature is expected from hard color-singlet exchange. Each of the highest transverse momentum (p(T)) jets must have p(T)(jet) > 40 GeV and pseudorapidity 1.4 0.2 GeV in the interval vertical bar eta vertical bar < 1 between the jets are observed in excess of calculations that assume only color-exchange. The fraction of events produced via color-singlet exchange, f(CSE), is measured as a function of p(T)(jet2), the pseudorapidity difference between the two leading jets, and the azimuthal angular separation between the two leading jets. The fraction f(CSE) has values of 0.4-1.0%. The results are compared with previous measurements and with predictions from perturbative quantum chromodynamics. In addition, the first study of jet-gap-jet events detected in association with an intact proton using a subsample of events with an integrated luminosity of 0.40 pb(-1) is presented. The intact protons are detected with the Roman pot detectors of the TOTEM experiment. The f(CSE) in this sample is 2.91 +/- 0.70(stat)(-1.01)(+1.08)(syst) times larger than that for inclusive dijet production in dijets with similar kinematics.Peer reviewe

Research and Development for Near Detector Systems Towards Long Term Evolution of Ultra-precise Long-baseline Neutrino Experiments

With the discovery of non-zero value of $\theta_{13}$ mixing angle, the next generation of long-baseline neutrino (LBN) experiments offers the possibility of obtaining statistically significant samples of muon and electron neutrinos and anti-neutrinos with large oscillation effects. In this document we intend to highlight the importance of Near Detector facilities in LBN experiments to both constrain the systematic uncertainties affecting oscillation analyses but also to perform, thanks to their close location, measurements of broad benefit for LBN physics goals. A strong European contribution to these efforts is possible

Towards a muon collider

A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work

Erratum: Towards a muon collider

The original online version of this article was revised: The additional reference [139] has been added. Tao Han’s ORICD ID has been incorrectly assigned to Chengcheng Han and Chengcheng Han’s ORCID ID to Tao Han. Yang Ma’s ORCID ID has been incorrectly assigned to Lianliang Ma, and Lianliang Ma’s ORCID ID to Yang Ma. The original article has been corrected

Results from the Chorus Experiment

The recent results from the CHORUS experiment are summarised. CHORUS is an experiment made to study the neutrino oscillation using the pure and intense # µ Wide Beam at SPS(CERN). A fraction of the neutrino interactions collected during the years 1994-1995 and 1996 by the CHORUS experiment has been analysed, searching for # # charged current interactions followed by the # lepton decay into a negative hadron or into a muon. Within the applied cuts, no # # candidate has been found. This result leads to a 90% C.L. limit P (# µ # # # ) &lt; 6.0 · 10 -4 on the mixing probability. We also report about the first direct observation of a neutrino induced charged current interation with two subsequent decays of short-lived particles that a complete analysis allows to interpreter as D +# s production followed by the decay chain D +# s # D + s #, D + s # # + # # , # + # µ + # µ # # . 1 Introduction The question about the neutrino mass and stability remains one of the most ..

Representing the CHORUS Collaboration

The recent results from the CHORUS experiment are summarised. CHORUS is an experiment made to study the neutrino oscillation using the pure and intense νµ Wide Beam at SPS(CERN). A fraction of the neutrino interactions collected during the years 1994-1995 and 1996 by the CHORUS experiment has been analysed, searching for ντ charged current interactions followed by the τ lepton decay into a negative hadron or into a muon. Within the applied cuts, no ντ candidate has been found. This result leads to a 90 % C.L. limit P (νµ → ντ) &lt; 6.0 · 10 −4 on the mixing probability. We also report about the first direct observation of a neutrino induced charged current interation with two subsequent decays of short-lived par-ticles that a complete analysis allows to interpreter as D +∗ s production followed by the decay chain D +∗ s → D + s γ,D + s → τ + ντ,τ + →µ + νµ ¯ντ.