The Impact of Negative Game Reviews and User Comments on Player Experience

Game reviews and player ratings have an effect on the commercial success of games. They are used extensively by game developers to gauge the success of their titles and by potential buyers to make more informed purchase decisions. However, their potential influence on player experience remains uncertain. We investigated how game reviews and user comments influence players' affective states and experiences during game play. We found that both professional reviews and user comments (especially the negative comments) affected experience measured through game ratings, and that this effect was not mediated by changes in players' moods. Our results are important to the game industry because of the meaningful negative effect that user and critic comments can have on individual player experience and the resulting commercial success of a game.Ye

Tensor analyzing powers for Li

Differential cross sections and T 20 and TT 20 analyzing powers have been measured for 70 MeV 7 Li breakup into the α particle plus triton channel, on a 120 Sn target. Measurements were made for both continuum breakup and sequential breakup via the 4.63 MeV state in 7 Li . The T 20 data for the continuum breakup do not agree with a semiclassical Coulomb model, indicating that the breakup at small angles does not proceed solely via a Coulomb force. The data generally show a somewhat better agreement with continuum discretized coupled channels calculations, indicating the importance of the nuclear force and channel coupling in the reaction mechanism

Neutron polarisation transfer, Cx′, in π+ photoproduction off the proton, d(γ⊙,n→π+)nspec

We report a first measurement of the double-polarisation observable, Cx′, in π+ photoproduction off the proton. The double-polarisation observable represents the transfer of polarisation from a circularly polarised photon beam to the recoiling neutron. The MAMI circularly polarised photon beam impinged on a liquid deuterium target cell, with reaction products detected in the Crystal Ball calorimeter. Ancillary apparatus surrounding the target provided tracking, particle identification and determination of recoil nucleon polarisation. The Cx′ observable is determined for photon energies 800-1400 MeV, providing new constraints on models aiming to elucidate the spectrum and properties of nucleon resonances. This is the first determination of any polarisation observable from the beam-recoil group of observables for this reaction. Inclusion of the new data in the database of the SAID partial wave analysis shifted the solution to a new global minima which, not only gives better agreement with the current data, but also improves the description of a range of other single and double polarisation observables for charged pion photoproduction

Double polarisation observable G for single pion photoproduction from the proton

We report measurements of and meson photoproduction from longitudinally spin-polarised protons by an energy tagged (0.73-2.3 GeV) and linearly polarised photon beam. A close to complete solid angle coverage for the reaction products was provided by the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The double-polarisation observable is extracted from Maximum Likelihood fits to the data, enabling the first accurate determination for the reaction , while also significantly extending the kinematic coverage for . This large data set provides an important constraint on the properties and spectrum of excited nucleon states decaying to Nπ in the mass range from 1.4 to 2.2 GeV, as well as for background (non-resonant) photoproduction processes. The considerable improvement achieved in the description of the observable within the SAID and Bonn-Gatchina approaches after implementation of our data, illustrates that the partial-wave analyses now significantly extend the knowledge on Nπ photoproduction amplitudes at GeV. A partial-wave analysis using the new high-precision data set has a large impact on the extracted properties of high-spin nucleon excited states

Differential cross sections for Λ(1520) using photoproduction at CLAS

he reaction γ p → K + Λ ( 1520 ) using photoproduction data from the CLAS g 12 experiment at Jefferson Lab is studied. The decay of Λ ( 1520 ) into two exclusive channels, Σ + π − and Σ − π + , is studied from the detected K + , π + , and π − particles. A good agreement is established for the Λ ( 1520 ) differential cross sections with the previous CLAS measurements. The differential cross sections as a function of center-of-mass angle are extended to higher photon energies. Newly added are the differential cross sections as a function of invariant four-momentum transfer t , which is the natural variable to use for a theoretical model based on a Regge-exchange reaction mechanism. No new N ∗ resonances decaying into the K + Λ ( 1520 ) final state are found

12C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region

High-momentum configurations of nucleon pairs at short-distance are probed using measurements of the 12C and 12C reactions (where N is either n or p), at high- and . The data span a missing-momentum range of 300–1000 MeV/c and are predominantly sensitive to the transition region of the strong nuclear interaction from a Tensor to Scalar interaction. The data are well reproduced by theoretical calculations using the Generalized Contact Formalism with both chiral and phenomenological nucleon-nucleon (NN) interaction models. This agreement suggests that the measured high missing-momentum protons up to 1000 MeV/c predominantly belong to short-ranged correlated (SRC) pairs. The measured 12C / 12C and 12C / 12C cross-section ratios are consistent with a decrease in the fraction of proton-neutron SRC pairs and increase in the fraction of proton-proton SRC pairs with increasing missing momentum. This confirms the transition from an isospin-dependent tensor NN interaction at ∼400 MeV/c to an isospin-independent scalar interaction at high-momentum around ∼800 MeV/c as predicted by theoretical calculation