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Measurement of inelastic J/ψ and ψ′ photoproduction at HERA
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Arslan, O.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, Springer-Verlag 2013 Journal of high energy physics Vol.2013 No.2
Exclusive electroproduction of two pions at HERA
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Ashery, D.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, Springer-Verlag 2012 The European physical journal. C, Particles and fi Vol.72 No.1
Measurement of heavy-quark jet photoproduction at HERA
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, G.,Bari, G. Springer-Verlag 2011 The European physical journal. C, Particles and fi Vol.71 No.5
Scaled momentum distributions for $ K_S^0 $ KS and $ \Lambda /\bar{\Lambda } $ in DIS at HERA
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, G.,Bari, G. Springer-Verlag 2012 Journal of high energy physics Vol.2012 No.3
Measurement of beauty production in deep inelastic scattering at HERA using decays into electrons
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, G.,Bari, G. Springer-Verlag 2011 European Physical Journal C Vol.71 No.2
Aad, G.,Abbott, B.,Abbott, D.C.,Abed Abud, A.,Abeling, K.,Abhayasinghe, D.K.,Abidi, S.H.,AbouZeid, O.S.,Abraham, N.L.,Abramowicz, H.,Abreu, H.,Abulaiti, Y.,Acharya, B.S.,Achkar, B.,Adachi, S.,Adam, L. North-Holland Pub. Co 2020 Physics letters. Section B Vol.801 No.-
<P><B>Abstract</B></P> <P>A search for non-resonant Higgs boson pair production, as predicted by the Standard Model, is presented, where one of the Higgs bosons decays via the H → b b channel and the other via one of the H → W <SUP> W ⁎ </SUP> / Z <SUP> Z ⁎ </SUP> / τ τ channels. The analysis selection requires events to have at least two <I>b</I>-tagged jets and exactly two leptons (electrons or muons) with opposite electric charge in the final state. Candidate events consistent with Higgs boson pair production are selected using a multi-class neural network discriminant. The analysis uses 139 fb<SUP>−1</SUP> of <I>pp</I> collision data recorded at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. An observed (expected) upper limit of 1.2 ( 0.9 − 0.3 + 0.4 ) pb is set on the non-resonant Higgs boson pair production cross-section at 95% confidence level, which is equivalent to 40 ( 29 − 9 + 14 ) times the value predicted in the Standard Model.</P>
Aad, G.,Abbott, B.,Abdallah, J.,Abdinov, O.,Aben, R.,Abolins, M.,AbouZeid, O. S.,Abramowicz, H.,Abreu, H.,Abreu, R.,Abulaiti, Y.,Acharya, B. S.,Adamczyk, L.,Adams, D. L.,Adelman, J.,Adomeit, S.,Adye, American Physical Society 2015 Physical Review Letters Vol.114 No.19
<P>A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H --> gamma gamma and H --> ZZ --> 4l decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. The measured masses from the individual channels and the two experiments are found to be consistent among themselves. The combined measured mass of the Higgs boson is m(H) = 125.09 +/- 0.21 (stat) +/- 0.11 (syst) GeV.</P>
Aad, G.,Abbott, B.,Abbott, D.C.,Abed Abud, A.,Abeling, K.,Abhayasinghe, D.K.,Abidi, S.H.,AbouZeid, O.S.,Abraham, N.L.,Abramowicz, H.,Abreu, H.,Abulaiti, Y.,Acharya, B.S.,Achkar, B.,Adachi, S.,Adam, L. North-Holland Pub. Co 2020 Physics letters. Section B Vol.801 No.-
<P><B>Abstract</B></P> <P>A search for long-lived particles decaying into an oppositely charged lepton pair, <I>μμ</I>, <I>ee</I>, or <I>eμ</I>, is presented using 32.8 <SUP> fb − 1 </SUP> of <I>pp</I> collision data collected at s = 13 TeV by the ATLAS detector at the LHC. Candidate leptons are required to form a vertex, within the inner tracking volume of ATLAS, displaced from the primary <I>pp</I> interaction region. No lepton pairs with an invariant mass greater than 12 GeV are observed, consistent with the background expectations derived from data. The detection efficiencies for generic resonances with lifetimes (<I>cτ</I>) of 100–1000 mm decaying into a dilepton pair with masses between 0.1–1.0 TeV are presented as a function of <SUB> p T </SUB> and decay radius of the resonances to allow the extraction of upper limits on the cross sections for theoretical models. The result is also interpreted in a supersymmetric model in which the lightest neutralino, produced via squark–antisquark production, decays into <SUP> ℓ + </SUP> <SUP> ℓ ′ − </SUP> ν ( ℓ , <SUP> ℓ ′ </SUP> = e , <I>μ</I>) with a finite lifetime due to the presence of R-parity violating couplings. Cross-section limits are presented for specific squark and neutralino masses. For a 700 GeV squark, neutralinos with masses of 50–500 GeV and mean proper lifetimes corresponding to <I>cτ</I> values between 1 mm to 6 m are excluded. For a 1.6 TeV squark, <I>cτ</I> values between 3 mm to 1 m are excluded for 1.3 TeV neutralinos.</P>
Aad, G.,Abbott, B.,Abdallah, J.,Abdel Khalek, S.,Abdinov, O.,Aben, R.,Abi, B.,Abolins, M.,AbouZeid, O.S.,Abramowicz, H.,Abreu, H.,Abreu, R.,Abulaiti, Y.,Acharya, B.S.,Adamczyk, L.,Adams, D.L.,Adelman, North-Holland Pub. Co 2014 Physics letters. Section B Vol.738 No.-
<P><B>Abstract</B></P> <P>A search is reported for Higgs boson decay to <SUP> μ + </SUP> <SUP> μ − </SUP> using data with an integrated luminosity of 24.8 <SUP> fb − 1 </SUP> collected with the ATLAS detector in <I>pp</I> collisions at s = 7 and 8 TeV at the CERN Large Hadron Collider. The observed dimuon invariant mass distribution is consistent with the Standard Model background-only hypothesis in the 120–150 GeV search range. For a Higgs boson with a mass of 125.5 GeV, the observed (expected) upper limit at the 95% confidence level is 7.0 (7.2) times the Standard Model expectation. This corresponds to an upper limit on the branching ratio BR ( H → <SUP> μ + </SUP> <SUP> μ − </SUP> ) of 1.5 × <SUP> 10 − 3 </SUP> .</P>
Measurement of the energy dependence of the total photon-proton cross section at HERA
ZEUS Collaboration,Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A.N.,Bar North-Holland Pub. Co 2011 Physics letters: B Vol.697 No.3
The energy dependence of the photon-proton total cross section, σ<SUB>tot</SUB><SUP>γ</SUP><SUP>p</SUP>, was determined from e<SUP>+</SUP>p scattering data collected with the ZEUS detector at HERA at three values of the center-of-mass energy, W, of the γp system in the range 194<W<296 GeV. This is the first determination of the W dependence of σ<SUB>tot</SUB><SUP>γ</SUP><SUP>p</SUP> from a single experiment at high W. Parameterizing σ<SUB>tot</SUB><SUP>γ</SUP><SUP>p</SUP>≃W<SUP>2ε</SUP>, ε=0.111+/-0.009(stat.)+/-0.036(syst.) was obtained.