4,310 research outputs found

    Understanding forward BB hadron production

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    The LHCb collaboration has recently performed a measurement of the production rate of inclusive BB hadron production (ppBXpp\to BX) 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 BB hadron pseudorapidity within the range of ηB[2.0,5.0]\eta_B \in [2.0,5.0]. A large tension (4σ4\sigma) is observed for the ratio measurement in the lower pseudorapidity range of ηB[2.0,3.0]\eta_B \in [2.0,3.0], where the data is observed to exceed theoretical predictions, while consistency is found at larger ηB\eta_B 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 x[103,104]x\in[10^{-3},10^{-4}]. Specifically, the gluon PDF must grow extremely quickly with decreasing xx 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 BB and DD hadron cross section data, available for a range of CoM energies, indicate systematic tension in the (pseudo)rapidity region of [2.0,2.5][2.0,2.5].Comment: 31 page

    The small-x gluon from forward charm production: implications for a 100 TeV proton collider

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    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 s=5,7\sqrt{s}=5,7 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 s=100\sqrt{s}=100 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?

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    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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