4,310 research outputs found
Understanding forward hadron production
The LHCb collaboration has recently performed a measurement of the production
rate of inclusive hadron production () at both 7 and 13~TeV
centre-of-mass (CoM) energies. As part of this measurement, the ratio of these
two cross section measurements has been presented differentially in hadron
pseudorapidity within the range of . A large tension
() is observed for the ratio measurement in the lower pseudorapidity
range of , where the data is observed to exceed
theoretical predictions, while consistency is found at larger values.
This behaviour is not expected within perturbative QCD, and can only be
achieved by introducing ad-hoc features into the structure of the
non-perturbative gluon PDF within the region of .
Specifically, the gluon PDF must grow extremely quickly with decreasing
within this kinematic range, closely followed by a period of decelerated
growth. However, such behaviour is highly disfavoured by global fits to proton
structure. Further studies of the available LHCb and hadron cross
section data, available for a range of CoM energies, indicate systematic
tension in the (pseudo)rapidity region of .Comment: 31 page
The small-x gluon from forward charm production: implications for a 100 TeV proton collider
We review the constraints on the small-x gluon PDF that can be derived by
exploiting the forward D meson production data from the LHCb experiment at
and 13 TeV. We then discuss the phenomenological implications of
the resulting improved small-x gluon for ultra-high energy astrophysics, in
particular neutrino telescopes, as well as for the proposed Future Circular
Collider (FCC) with TeV. We illustrate how at the FCC even
electroweak scale cross-sections can become sensitive to the small-x region of
the quark and gluon PDFs, and then demonstrate how the addition of the LHCb
heavy meson production measurements leads to a reduction of PDF uncertainties
for various benchmark cross-sections.Comment: 5 pages, 4 figures, to appear in the proceedings of the XXV
International Workshop on Deep-Inelastic Scattering and Related Subjects, 3-7
April 2017, University of Birmingham, U
Social inclusion through ageing-in-place with care?
The onset of ill-health and frailty in later life, within the context of the policy of ageing-in-place, is increasingly being responded to through the provision of home care. In the philosophy of ageing-in-place, the home provides for continuity of living environment, maintenance of independence in the community and social inclusion. The provision of assistance to remain at home assumes continuity in the living environment and independence in the organisation of daily life and social contact. This paper explores the changes that occur as a result of becoming a care recipient within the home and concludes that the transition into receiving care is characterised by discontinuity and upheaval which tends to reinforce social exclusion. We draw on the rites of passage framework, which highlights social processes of separation, liminality and reconnection, in analysing this transition to enhance understanding of the experience and gain insights to improve the policy and practice of home care. Separation from independent living leads to a state of liminality. The final stage in the rites of passage framework draws attention to reconnections, but reconnection is not inevitable. Reconnection is, however, an appropriate goal for the care sector when supporting frail or disabled older people through the transition into becoming a home-care recipient
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