Exclusive production in CMS

2014 ◽  
Vol 29 (28) ◽  
pp. 1446011 ◽  
Author(s):  
J. Hollar ◽  
Keyword(s):  
Central Exclusive Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Exclusive Production ◽  
Cms Experiment ◽  
Proton Proton Collisions

This paper reviews measurements of exclusive production performed by the CMS experiment in proton–proton collisions during Run 1 of the LHC. The results include photon-induced production of μ+μ-, e+e- and W+W- pairs, and a search for strong Central Exclusive Production of γγ pairs.

scholarly journals Central exclusive production of axial-vector $f_{1}$ mesons in proton-proton collisions

2021 ◽  
Author(s):  
Piotr Lebiedowicz ◽  
Josef Leutgeb ◽  
Otto Nachtmann ◽  
Anton Rebhan ◽  
Antoni Szczurek
Keyword(s):  
Axial Vector ◽  
Central Exclusive Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Exclusive Production ◽  
Proton Proton Collisions

scholarly journals Central exclusive production of W boson pairs in pp collisions at the LHC in hadronic and semi-leptonic final states

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
C. Baldenegro ◽  
G. Biagi ◽  
G. Legras ◽  
C. Royon
Keyword(s):  
W Boson ◽  
Hadron Collider ◽  
Large Radius ◽  
Final States ◽  
Central Exclusive Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Exclusive Production ◽  
Forward Proton ◽  
Proton Proton Collisions

Abstract We present a phenomenology study on central exclusive production of W+W− boson pairs in proton-proton collisions at the Large Hadron Collider at 14 TeV using the forward proton detectors, such as the ATLAS Forward Proton or the CMS-TOTEM Precision Proton Spectrometer detectors. Final states where at least one of the W bosons decay hadronically in a large-radius jet are considered. The latter extends previous efforts that consider solely leptonic final states. A measurement of exclusive W+W− also allows us to further constrain anomalous quartic gauge boson interactions between photons and W bosons. Expected limits on anomalous quartic gauge couplings $$ {a}_{0,C}^W $$ a 0 , C W associated to dimension-six effective operators are derived for the hadronic, semi-leptonic, and leptonic final states. It is found that the couplings can be probed down to one-dimensional values of $$ {a}_0^W=3.7\times {10}^{-7}{\mathrm{GeV}}^{-2} $$ a 0 W = 3.7 × 10 − 7 GeV − 2 and $$ {a}_C^W=9.2\times {10}^{-7}{\mathrm{GeV}}^{-7} $$ a C W = 9.2 × 10 − 7 GeV − 7 at 95% CL at an integrated luminosity of 300 fb−1 by combining all final states, compared to values of about $$ {a}_0^W=4\times {10}^{-6}{\mathrm{GeV}}^{-2} $$ a 0 W = 4 × 10 − 6 GeV − 2 and $$ {a}_C^W=1\times {10}^{-5}{\mathrm{GeV}}^{-2} $$ a C W = 1 × 10 − 5 GeV − 2 at 95% CL expected for the leptonic channel alone.

scholarly journals Central Exclusive Production at LHCb

2019 ◽  
Vol 64 (7) ◽  
pp. 595
Author(s):  
C. Van Hulse
Keyword(s):  
Theoretical Calculations ◽  
Lhcb Collaboration ◽  
Central Exclusive Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Exclusive Production ◽  
8 Tev ◽  
Gluon Distributions ◽  
Bjorken X ◽  
Proton Proton Collisions

The LHCb collaboration has measured central exclusive production of J/ф, ф(2S), and ϒ mesons as well as J/фJ/ф, J/фф(2S), ф(2S)ф(2S), and xcxc meson pairs in proton-proton collisions. The analyses of ϒ and charmonium pairs are performed at the centre-of-mass energies of 7 TeV and 8 TeV, and those of J/ф and ф(2S) are done at 7 TeV and 13 TeV. The analysis at 13 TeV involves the use of new shower counters. These allow a reduction in the background by vetoing events with activity in an extended region in rapidity. The measurements of central exclusive production at LHCb are sensitive to gluon distributions for Bjorken-x values down to 2×10−6 (at 13 TeV). An overview of the LHCb results is presented and compared to existing measurements of other experiments and theoretical calculations.

scholarly journals Central exclusive production of K+K− pairs in proton-proton collisions

2019 ◽  
Vol 199 ◽  
pp. 03005
Author(s):  
Piotr Lebiedowicz ◽  
Antoni Szczurek ◽  
Otto Nachtmann
Keyword(s):  
Experimental Data ◽  
Pseudoscalar Meson ◽  
Interference Effects ◽  
Central Exclusive Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Exclusive Production ◽  
Diffractive Production ◽  
Proton Proton Collisions ◽  
Theoretical Results

We discuss central exclusive diffractive production of light mesons in the reactions $pp \to pp{\pi ^ + }{\pi ^ - }$ and $pp \to pp{K^ + }{K^ - }$. The calculation is based on a tensor-pomeron approach. We include a purely diffractive dipion continuum, and the scalar f0(980), f0(1500), f0(1710) and tensor f2(1770), ${f^{\prime}_2}(1525)$ resonances decaying into pseudoscalar meson pairs. We include also photoproduction mechanisms for the nonresonant (Drell-Söding) and the ϕ(1020) resonance contributions. The theoretical results are compared with existing CDF experimental data and predictions for being carried out LHC experiments are presented. The distributions in dimeson invariant mass and in a special "glueball filter variable" including the interference effects of resonance and dimeson continuum are presented.

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