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Studies of Beauty Suppression via Nonprompt <math><mrow><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math> Mesons in Pb-Pb Collisions at <math><mrow><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi>NN</mi></mrow></msub></mrow></msqrt><mo>=</mo><mn>5.02</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math>
https://repo.scoap3.org/record/33752
The transverse momentum spectra of D0 mesons from b hadron decays are measured at midrapidity (|y|<1) in pp and Pb-Pb collisions at a nucleon-nucleon center of mass energy of 5.02 TeV with the CMS detector at the LHC. The D0 mesons from b hadron decays are distinguished from prompt D0 mesons by their decay topologies. In Pb-Pb collisions, the B→D0 yield is found to be suppressed in the measured pT range from 2 to 100 GeV/c as compared to pp collisions. The suppression is weaker than that of prompt D0 mesons and charged hadrons for pT around 10 GeV/c. While theoretical calculations incorporating partonic energy loss in the quark-gluon plasma can successfully describe the measured B→D0 suppression at higher pT, the data show an indication of larger suppression than the model predictions in the range of 2<pT<5 GeV/c.Sirunyan, A. M.Wed, 10 Jul 2019 00:16:23 GMThttps://repo.scoap3.org/record/33752APS2019-07-09Search for supersymmetry in final states with photons and missing transverse momentum in proton-proton collisions at 13 TeV
https://repo.scoap3.org/record/33658
Results are reported of a search for supersymmetry in final states with photons and missing transverse momentum in proton-proton collisions at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb −1 collected at a center-of-mass energy of 13 TeV using the CMS detector. The results are interpreted in the context of models of gauge-mediated supersymmetry breaking. Production cross section limits are set on gluino and squark pair production in this framework. Gluino masses below 1.86 TeV and squark masses below 1.59 TeV are excluded at 95% confidence level.Sirunyan, A.Wed, 03 Jul 2019 18:32:15 GMThttps://repo.scoap3.org/record/336582019-06-28Observation of <math><mrow><mi>ψ</mi><mo>(</mo><mn>3686</mn><mo>)</mo><mo>→</mo><mi>p</mi><mover><mrow><mi>p</mi></mrow><mrow><mo>¯</mo></mrow></mover><mi>ϕ</mi></mrow></math>
https://repo.scoap3.org/record/33597
Using a data sample of 4.48×108 ψ(3686) events collected with the BESIII detector, we present a first observation of ψ(3686)→pp¯ϕ, and we measure its branching fraction to be [6.06±0.38(stat)±0.48(syst)]×10−6. In contrast to the earlier discovery of a threshold enhancement in the pp¯-mass spectrum of the channel J/ψ→γpp¯, denoted as X(pp¯), we do not find a similar enhancement in ψ(3686)→pp¯ϕ. An upper limit of 1.82×10−7 at the 90% confidence level on the branching fraction of ψ(3686)→X(pp¯)ϕ→pp¯ϕ is obtained.Ablikim, M.Thu, 27 Jun 2019 16:16:07 GMThttps://repo.scoap3.org/record/33597APS2019-06-27Measurement of electroweak WZ boson production and search for new physics in WZ + two jets events in pp collisions at s=13TeV
https://repo.scoap3.org/record/33576
A measurement of WZ electroweak (EW) vector boson scattering is presented. The measurement is performed in the leptonic decay modes WZ→ℓνℓ′ℓ′ , where ℓ,ℓ′=e,μ . The analysis is based on a data sample of proton-proton collisions at s=13 TeV at the LHC collected with the CMS detector and corresponding to an integrated luminosity of 35.9 fb −1 . The WZ plus two jet production cross section is measured in fiducial regions with enhanced contributions from EW production and found to be consistent with standard model predictions. The EW WZ production in association with two jets is measured with an observed (expected) significance of 2.2 (2.5) standard deviations. Constraints on charged Higgs boson production and on anomalous quartic gauge couplings in terms of dimension-eight effective field theory operators are also presented.Sirunyan, A.M.Wed, 26 Jun 2019 13:51:33 GMThttps://repo.scoap3.org/record/335762019-08-10Search for the associated production of the Higgs boson and a vector boson in proton-proton collisions at s $$ \sqrt{s} $$ = 13 TeV via Higgs boson decays to τ leptons
https://repo.scoap3.org/record/33497
A search for the standard model Higgs boson produced in association with a W or a Z boson and decaying to a pair of τ leptons is performed. A data sample of proton-proton collisions collected at s $$ \sqrt{s} $$ = 13 TeV by the CMS experiment at the CERN LHC is used, corresponding to an integrated luminosity of 35.9 fb −1 . The signal strength is measured relative to the expectation for the standard model Higgs boson, yielding μ = 2.5 − 1.3 + 1.4 . These results are combined with earlier CMS measurements targeting Higgs boson decays to a pair of τ leptons, performed with the same data set in the gluon fusion and vector boson fusion production modes. The combined signal strength is μ = 1.24 − 0.27 + 0.29 (1.00 − 0.23 + 0.24 expected), and the observed significance is 5.5 standard deviations (4.8 expected) for a Higgs boson mass of 125 GeV.Sirunyan, A.Thu, 20 Jun 2019 16:33:31 GMThttps://repo.scoap3.org/record/334972019-06-19Search for an exotic decay of the Higgs boson to a pair of light pseudoscalars in the final state with two muons and two b quarks in pp collisions at 13 TeV
https://repo.scoap3.org/record/33444
A search for exotic decays of the Higgs boson to a pair of light pseudoscalar particles a1 is performed under the hypothesis that one of the pseudoscalars decays to a pair of opposite sign muons and the other decays to bb‾ . Such signatures are predicted in a number of extensions of the standard model (SM), including next-to-minimal supersymmetry and two-Higgs-doublet models with an additional scalar singlet. The results are based on a data set of proton-proton collisions corresponding to an integrated luminosity of 35.9 fb−1 , accumulated with the CMS experiment at the CERN LHC in 2016 at a centre-of-mass energy of 13 TeV. No statistically significant excess is observed with respect to the SM backgrounds in the search region for pseudoscalar masses from 20 GeV to half of the Higgs boson mass. Upper limits at 95% confidence level are set on the product of the production cross section and branching fraction, σhB(h→a1a1→μ+μ−bb‾) , ranging from 5 to 33 fb, depending on the pseudoscalar mass. Corresponding limits on the branching fraction, assuming the SM prediction for σh , are (1–7)×10−4 .Sirunyan, A.M.Wed, 19 Jun 2019 14:15:45 GMThttps://repo.scoap3.org/record/334442019-08-10Search for dark matter in events with a leptoquark and missing transverse momentum in proton-proton collisions at 13 TeV
https://repo.scoap3.org/record/33443
A search is presented for dark matter in proton-proton collisions at a center-of-mass energy of s=13 TeV using events with at least one high transverse momentum ( pT ) muon, at least one high- pT jet, and large missing transverse momentum. The data were collected with the CMS detector at the CERN LHC in 2016 and 2017, and correspond to an integrated luminosity of 77.4 fb −1 . In the examined scenario, a pair of scalar leptoquarks is assumed to be produced. One leptoquark decays to a muon and a jet while the other decays to dark matter and low- pT standard model particles. The signature for signal events would be significant missing transverse momentum from the dark matter in conjunction with a peak at the leptoquark mass in the invariant mass distribution of the highest pT muon and jet. The data are observed to be consistent with the background predicted by the standard model. For the first benchmark scenario considered, dark matter masses up to 500 GeV are excluded for leptoquark masses mLQ≈1400 GeV, and up to 300 GeV for mLQ≈1500 GeV. For the second benchmark scenario, dark matter masses up to 600 GeV are excluded for mLQ≈1400 GeV.Sirunyan, A.M.Wed, 19 Jun 2019 14:15:31 GMThttps://repo.scoap3.org/record/334432019-08-10Study of <math><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><mi>γ</mi><mi>ω</mi><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></math> and Observation of <math><mrow><mi>X</mi><mo>(</mo><mn>3872</mn><mo>)</mo><mo>→</mo><mi>ω</mi><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></math>
https://repo.scoap3.org/record/33381
We study the e+e−→γωJ/ψ process using 11.6 fb−1 e+e− annihilation data taken at center-of-mass energies from s=4.008 GeV to 4.600 GeV with the BESIII detector at the BEPCII storage ring. The X(3872) resonance is observed for the first time in the ωJ/ψ system with a significance of more than 5σ. The relative decay ratio of X(3872)→ωJ/ψ and π+π−J/ψ is measured to be R=1.6−0.3+0.4±0.2, where the first uncertainty is statistical and the second systematic (the same hereafter). The s-dependent cross section of e+e−→γX(3872) is also measured and investigated, and it can be described by a single Breit-Wigner resonance, referred to as the Y(4200), with a mass of 4200.6−13.3+7.9±3.0 MeV/c2 and a width of 115−26+38±12 MeV. In addition, to describe the ωJ/ψ mass distribution above 3.9 GeV/c2, we need at least one additional Breit-Wigner resonance, labeled as X(3915), in the fit. The mass and width of the X(3915) are determined. The resonant parameters of the X(3915) agree with those of the Y(3940) in B→KωJ/ψ and of the X(3915) in γγ→ωJ/ψ observed by the Belle and BABAR experiments within errors.Ablikim, M.Tue, 18 Jun 2019 14:03:14 GMThttps://repo.scoap3.org/record/33381APS2019-06-14Search for a low-mass τ − τ + resonance in association with a bottom quark in proton-proton collisions at s $$ \sqrt{s} $$ = 13 TeV
https://repo.scoap3.org/record/33322
A general search is presented for a low-mass τ − τ + resonance produced in association with a bottom quark. The search is based on proton-proton collision data at a center-of-mass energy of 13 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb −1 . The data are consistent with the standard model expectation. Upper limits at 95% confidence level on the cross section times branching fraction are determined for two signal models: a light pseudoscalar Higgs boson decaying to a pair of τ leptons produced in association with bottom quarks, and a low-mass boson X decaying to a τ -lepton pair that is produced in the decay of a bottom-like quark B such that B → bX. Masses between 25 and 70 GeV are probed for the light pseudoscalar boson with upper limits ranging from 250 to 44 pb. Upper limits from 20 to 0.3 pb are set on B masses between 170 and 450 GeV for X boson masses between 20 and 70 GeV.Sirunyan, A.Fri, 14 Jun 2019 16:08:58 GMThttps://repo.scoap3.org/record/333222019-05-31Study of the decays <math><msubsup><mi>D</mi><mi>s</mi><mo>+</mo></msubsup><mo>→</mo><msubsup><mi>K</mi><mi>S</mi><mn>0</mn></msubsup><msup><mi>K</mi><mo>+</mo></msup></math> and <math><msubsup><mi>K</mi><mi>L</mi><mn>0</mn></msubsup><msup><mi>K</mi><mo>+</mo></msup></math>
https://repo.scoap3.org/record/33267
Using an e+e− annihilation data sample corresponding to an integrated luminosity of 3.19 fb−1 and collected at a center-of-mass energy s=4.178 GeV with the BESIII detector, we measure the absolute branching fractions B(Ds+→KS0K+)=(1.425±0.038stat.±0.031syst.)% and B(Ds+→KL0K+)=(1.485±0.039stat.±0.046syst.)%. The branching fraction of Ds+→KS0K+ is compatible with the world average and that of Ds+→KL0K+ is measured for the first time. We present the first measurement of the KS0−KL0 asymmetry in the decays Ds+→KS,L0K+, and R(Ds+→KS,L0K+)=B(Ds+→KS0K+)−B(Ds+→KL0K+)B(Ds+→KS0K+)+B(Ds+→KL0K+)=(−2.1±1.9stat.±1.6syst.)%. In addition, we measure the direct CP asymmetries ACP(Ds±→KS0K±)=(0.6±2.8stat.±0.6syst.)% and ACP(Ds±→KL0K±)=(−1.1±2.6stat.±0.6syst.)%.Ablikim, M.Wed, 12 Jun 2019 16:16:31 GMThttps://repo.scoap3.org/record/33267APS2019-06-12Measurements of the Higgs boson width and anomalous <math><mrow><mi>H</mi><mi>V</mi><mi>V</mi></mrow></math> couplings from on-shell and off-shell production in the four-lepton final state
https://repo.scoap3.org/record/33244
Studies of on-shell and off-shell Higgs boson production in the four-lepton final state are presented, using data from the CMS experiment at the LHC that correspond to an integrated luminosity of 80.2 fb−1 at a center-of-mass energy of 13 TeV. Joint constraints are set on the Higgs boson total width and parameters that express its anomalous couplings to two electroweak vector bosons. These results are combined with those obtained from the data collected at center-of-mass energies of 7 and 8 TeV, corresponding to integrated luminosities of 5.1 and 19.7 fb−1, respectively. Kinematic information from the decay particles and the associated jets are combined using matrix element techniques to identify the production mechanism and to increase sensitivity to the Higgs boson couplings in both production and decay. The constraints on anomalous HVV couplings are found to be consistent with the standard model expectation in both the on-shell and off-shell regions. Under the assumption of a coupling structure similar to that in the standard model, the Higgs boson width is constrained to be 3.2−2.2+2.8 MeV while the expected constraint based on simulation is 4.1−4.0+5.0 MeV. The constraints on the width remain similar with the inclusion of the tested anomalous HVV interactions.Sirunyan, A. M.Wed, 12 Jun 2019 00:16:29 GMThttps://repo.scoap3.org/record/33244APS2019-06-11Observation of a Narrow Pentaquark State, <math><mrow><msub><mrow><mi>P</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>(</mo><mn>4312</mn><msup><mrow><mo>)</mo></mrow><mrow><mo>+</mo></mrow></msup></mrow></math>, and of the Two-Peak Structure of the <math><msub><mi>P</mi><mi>c</mi></msub><mo>(</mo><mn>4450</mn><msup><mo>)</mo><mo>+</mo></msup></math>
https://repo.scoap3.org/record/33152
A narrow pentaquark state, Pc(4312)+, decaying to J/ψp, is discovered with a statistical significance of 7.3σ in a data sample of Λb0→J/ψpK− decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The Pc(4450)+ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, Pc(4440)+ and Pc(4457)+, where the statistical significance of this two-peak interpretation is 5.4σ. The proximity of the Σc+D¯0 and Σc+D¯*0 thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states.Aaij, R.Wed, 05 Jun 2019 20:16:33 GMThttps://repo.scoap3.org/record/33152APS2019-06-05Amplitude analysis and branching fraction measurement of <math><mrow><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math>
https://repo.scoap3.org/record/33098
Utilizing the dataset corresponding to an integrated luminosity of 2.93 fb−1 at s=3.773 GeV collected by the BESIII detector, we report the first amplitude analysis and branching fraction measurement of the D0→K−π+π0π0 decay. We investigate the substructures and determine the relative fractions and the phases among the different intermediate processes. Our results are used to provide an accurate detection efficiency and allow measurement of B(D0→K−π+π0π0)=(8.86±0.13(stat)±0.19(syst))%.Ablikim, M.Fri, 31 May 2019 16:16:22 GMThttps://repo.scoap3.org/record/33098urn:ISSN:2470-0029APS2019-05-31Observation of the Decay <math><mi>X</mi><mo>(</mo><mn>3872</mn><mo>)</mo><mo>→</mo><msup><mi>π</mi><mn>0</mn></msup><msub><mi>χ</mi><mrow><mi>c</mi><mn>1</mn></mrow></msub><mo>(</mo><mn>1</mn><mi>P</mi><mo>)</mo></math>
https://repo.scoap3.org/record/32994
Using a total of 9.0 fb−1 of e+e− collision data with center-of-mass energies between 4.15 and 4.30 GeV collected by the BESIII detector, we search for the processes e+e−→γX(3872) with X(3872)→π0χcJ for J=0, 1, 2. We report the first observation of X(3872)→π0χc1, a new decay mode of the X(3872), with a statistical significance of more than 5σ for all systematic fit variations. Normalizing to the previously established process e+e−→γX(3872) with X(3872)→π+π−J/ψ, we find B(X(3872)→π0χc1)/B(X(3872)→π+π−J/ψ)=0.88−0.27+0.33±0.10, where the first error is statistical and the second is systematic. We set 90% confidence level upper limits on the corresponding ratios for the decays to π0χc0 and π0χc2 of 19 and 1.1, respectively.Ablikim, M.Tue, 28 May 2019 09:41:22 GMThttps://repo.scoap3.org/record/32994urn:ISSN:1079-7114APS2019-05-23Search for associated production of a Higgs boson and a single top quark in proton-proton collisions at <math><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>
https://repo.scoap3.org/record/32898
A search is presented for the production of a Higgs boson in association with a single top quark, based on data collected in 2016 by the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, which corresponds to an integrated luminosity of 35.9 fb−1. The production cross section for this process is highly sensitive to the absolute values of the top quark Yukawa coupling, yt; the Higgs boson coupling to vector bosons, gHVV; and, uniquely, their relative sign. Analyses using multilepton signatures, targeting H→WW, H→ττ, and H→ZZ decay modes, and signatures with a single lepton and a bb¯ pair, targeting the H→bb¯ decay, are combined with a reinterpretation of a measurement in the H→γγ channel to constrain yt. For a standard model–like value of gHVV, the data favor positive values of yt and exclude values of yt below about −0.9ytSM.Sirunyan, A. M.Tue, 28 May 2019 09:36:08 GMThttps://repo.scoap3.org/record/32898urn:ISSN:2470-0029APS2019-05-21Cross section measurements of <math><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>−</mo></msup><mo>→</mo><mi>ω</mi><msub><mi>χ</mi><mrow><mi>c</mi><mn>0</mn></mrow></msub></math> from <math><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>4.178</mn></math> to 4.278 GeV
https://repo.scoap3.org/record/32874
The cross section of the process e+e−→ωχc0 is measured at center-of-mass energies from s=4.178 to 4.278 GeV using a data sample of 7 fb−1 collected with the BESIII detector operating at the BEPCII storage ring. The dependence of the cross section on s shows a resonant structure with mass of (4218.5±1.6(stat)±4.0(syst)) MeV/c2 and width of (28.2±3.9(stat)±1.6(syst)) MeV, respectively. This observation confirms and improves upon the result of a previous study. The angular distribution of the e+e−→ωχc0 process is extracted for the first time.Ablikim, M.Tue, 28 May 2019 09:34:47 GMThttps://repo.scoap3.org/record/32874urn:ISSN:2470-0029APS2019-05-16Observation of the <math><mrow><mi>W</mi></mrow></math>-annihilation decay <math><mrow><msubsup><mrow><mi>D</mi></mrow><mrow><mi>s</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><mi>ω</mi><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math> and evidence for <math><mrow><msubsup><mrow><mi>D</mi></mrow><mrow><mi>s</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><mi>ω</mi><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow></math>
https://repo.scoap3.org/record/32857
We report the observation of W-annihilation decay Ds+→ωπ+ and evidence for Ds+→ωK+ in a data sample corresponding to an integrated luminosity of 3.19 fb−1 collected with the BESIII detector at a center-of-mass energy s=4.178 GeV. We obtain the branching fractions B(Ds+→ωπ+)=(1.77±0.32stat±0.13sys)×10−3 with a significance of 6.7σ and B(Ds+→ωK+)=(0.87±0.24stat±0.08sys)×10−3 with a significance of 4.4σ. This measurement provides critical information to determine the nonperturbative W-annihilation amplitudes and shows the potential of searching for CP asymmetry in Ds+→ωK+.Ablikim, M.Tue, 28 May 2019 09:33:37 GMThttps://repo.scoap3.org/record/32857urn:ISSN:2470-0029APS2019-05-13Study of the process <math><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><mi>p</mi><mover><mrow><mi>p</mi></mrow><mrow><mo>¯</mo></mrow></mover></mrow></math> via initial state radiation at BESIII
https://repo.scoap3.org/record/32851
The Born cross section for the process e+e−→pp¯ is measured using the initial state radiation technique with an undetected photon. This analysis is based on datasets corresponding to an integrated luminosity of 7.5 fb−1, collected with the BESIII detector at the BEPCII collider at center of mass energies between 3.773 and 4.600 GeV. The Born cross section for the process e+e−→pp¯ and the proton effective form factor are determined in the pp¯ invariant mass range between 2.0 and 3.8 GeV/c2 divided into 30 intervals. The proton form factor ratio (|GE|/|GM|) is measured in 3 intervals of the pp¯ invariant mass between 2.0 and 3.0 GeV/c2.Ablikim, M.Tue, 28 May 2019 09:32:46 GMThttps://repo.scoap3.org/record/32851urn:ISSN:2470-0029APS2019-05-10Combinations of single-top-quark production cross-section measurements and | f LV V tb | determinations at s $$ \sqrt{s} $$ = 7 and 8 TeV with the ATLAS and CMS experiments
https://repo.scoap3.org/record/32754
This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at s $$ \sqrt{s} $$ = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb −1 at s $$ \sqrt{s} $$ = 7 TeV and 12.2 to 20.3 fb −1 at s $$ \sqrt{s} $$ = 8 TeV. These combinations are performed per centre-of-mass energy and for each production mode: t -channel, tW , and s -channel. The combined t -channel cross-sections are 67.5 ± 5.7 pb and 87.7 ± 5.8 pb at s $$ \sqrt{s} $$ = 7 and 8 TeV respectively. The combined tW cross-sections are 16.3 ± 4.1 pb and 23.1 ± 3.6 pb at s $$ \sqrt{s} $$ = 7 and 8 TeV respectively. For the s -channel cross-section, the combination yields 4.9 ± 1.4 pb at s $$ \sqrt{s} $$ = 8 TeV. The square of the magnitude of the CKM matrix element V tb multiplied by a form factor f LV is determined for each production mode and centre-of-mass energy, using the ratio of the measured cross-section to its theoretical prediction. It is assumed that the top-quark-related CKM matrix elements obey the relation | V td |, | V ts | ≪ | V tb |. All the | f LV V tb | 2 determinations, extracted from individual ratios at s $$ \sqrt{s} $$ = 7 and 8 TeV, are combined, resulting in | f LV V tb | = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.Aaboud, M.Mon, 27 May 2019 16:05:19 GMThttps://repo.scoap3.org/record/32754urn:ISSN:1029-8479Springer/SISSA2019-05-16Measurement of inclusive very forward jet cross sections in proton-lead collisions at s N N $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV
https://repo.scoap3.org/record/32693
Measurements of differential cross sections for inclusive very forward jet production in proton-lead collisions as a function of jet energy are presented. The data were collected with the CMS experiment at the LHC in the laboratory pseudorapidity range −6.6 < η < −5.2. Asymmetric beam energies of 4 TeV for protons and 1.58 TeV per nucleon for Pb nuclei were used, corresponding to a center-of-mass energy per nucleon pair of s N N $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV. Collisions with either the proton (p+Pb) or the ion (Pb+p) traveling towards the negative η hemisphere are studied. The jet cross sections are unfolded to stable-particle level cross sections with p T ≳ 3 GeV, and compared to predictions from various Monte Carlo event generators. In addition, the cross section ratio of p+Pb and Pb+p data is presented. The results are discussed in terms of the saturation of gluon densities at low fractional parton momenta. None of the models under consideration describes all the data over the full jet-energy range and for all beam configurations. Discrepancies between the differential cross sections in data and model predictions of more than two orders of magnitude are observed.Sirunyan, A.Mon, 27 May 2019 15:23:55 GMThttps://repo.scoap3.org/record/32693urn:ISSN:1029-8479Springer/SISSA2019-05-07Search for supersymmetry in events with a photon, jets, b \documentclass[12pt]{minimal}
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https://repo.scoap3.org/record/32688
A search for supersymmetry is presented based on events with at least one photon, jets, and large missing transverse momentum produced in proton–proton collisions at a center-of-mass energy of 13 Te \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {b}$$\end{document} -tagged jets, and the missing transverse momentum. No significant excess of events is observed with respect to the expectations from standard model processes. Limits are placed on the gluino and top squark pair production cross sections using several simplified models of supersymmetric particle production with gauge-mediated supersymmetry breaking. Depending on the model and the mass of the next-to-lightest supersymmetric particle, the production of gluinos with masses as large as 2120 Ge \documentclass[12pt]{minimal}
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\begin{document}$$\,\text {Ge}\text {V}$$\end{document} and the production of top squarks with masses as large as 1230 Ge \documentclass[12pt]{minimal}
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\begin{document}$$\,\text {Ge}\text {V}$$\end{document} are excluded at 95% confidence level.Sirunyan, A. M.Mon, 27 May 2019 15:19:58 GMThttps://repo.scoap3.org/record/326882019-5-25Combined measurements of Higgs boson couplings in proton–proton collisions at s=13Te \documentclass[12pt]{minimal}
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\begin{document}$$\sqrt{s}=13\,\text {Te}\text {V} $$\end{document}
https://repo.scoap3.org/record/32673
Combined measurements of the production and decay rates of the Higgs boson, as well as its couplings to vector bosons and fermions, are presented. The analysis uses the LHC proton–proton collision data set recorded with the CMS detector in 2016 at s=13Te \documentclass[12pt]{minimal}
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\begin{document}$$\sqrt{s}=13\,\text {Te}\text {V} $$\end{document} , corresponding to an integrated luminosity of 35.9 fb-1 \documentclass[12pt]{minimal}
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\begin{document}$${\,\text {fb}^{-1}} $$\end{document} . The combination is based on analyses targeting the five main Higgs boson production mechanisms (gluon fusion, vector boson fusion, and associated production with a W \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {W}$$\end{document} or Z \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {Z}$$\end{document} boson, or a top quark-antiquark pair) and the following decay modes: H→γγ \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {Z}\mathrm {Z}$$\end{document} , WW \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {W}\mathrm {W}$$\end{document} , ττ \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {\tau }\mathrm {\tau }$$\end{document} , bb \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {b} \mathrm {b} $$\end{document} , and μμ \documentclass[12pt]{minimal}
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\begin{document}$$\mathrm {\mu }\mathrm {\mu }$$\end{document} . Searches for invisible Higgs boson decays are also considered. The best-fit ratio of the signal yield to the standard model expectation is measured to be μ=1.17±0.10 \documentclass[12pt]{minimal}
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\begin{document}$$\mu =1.17\pm 0.10$$\end{document} , assuming a Higgs boson mass of 125.09Ge \documentclass[12pt]{minimal}
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\begin{document}$$125.09\,\text {Ge}\text {V} $$\end{document} . Additional results are given for various assumptions on the scaling behavior of the production and decay modes, including generic parametrizations based on ratios of cross sections and branching fractions or couplings. The results are compatible with the standard model predictions in all parametrizations considered. In addition, constraints are placed on various two Higgs doublet models.Sirunyan, A. M.Mon, 27 May 2019 14:58:17 GMThttps://repo.scoap3.org/record/326732019-5-20Measurement of the energy density as a function of pseudorapidity in proton–proton collisions at s=13TeV \documentclass[12pt]{minimal}
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\begin{document}$$\sqrt{s} =13\,\text {TeV} $$\end{document}
https://repo.scoap3.org/record/32611
A measurement of the energy density in proton–proton collisions at a centre-of-mass energy of s=13 \documentclass[12pt]{minimal}
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\begin{document}$$\sqrt{s} =13$$\end{document} TeV \documentclass[12pt]{minimal}
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\begin{document}$$\,\text {TeV}$$\end{document} is presented. The data have been recorded with the CMS experiment at the LHC during low luminosity operations in 2015. The energy density is studied as a function of pseudorapidity in the ranges -6.6<η<-5.2 \documentclass[12pt]{minimal}
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\begin{document}$$-\,6.6<\eta <-\,5.2$$\end{document} and 3.15<|η|<5.20 \documentclass[12pt]{minimal}
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\begin{document}$$3.15<|\eta |<5.20$$\end{document} . The results are compared with the predictions of several models. All the models considered suggest a different shape of the pseudorapidity dependence compared to that observed in the data. A comparison with LHC proton–proton collision data at s=0.9 \documentclass[12pt]{minimal}
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\begin{document}$$\sqrt{s} =0.9$$\end{document} and 7TeV \documentclass[12pt]{minimal}
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\begin{document}$$7\,\text {TeV} $$\end{document} confirms the compatibility of the data with the hypothesis of limiting fragmentation.Sirunyan, A. M.Tue, 07 May 2019 13:35:03 GMThttps://repo.scoap3.org/record/326112019-5-7Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at s=8 and 13 TeV
https://repo.scoap3.org/record/32566
The results of a search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV decaying into two photons are presented. The analysis uses the data set collected with the CMS experiment in proton-proton collisions during the 2012 and 2016 LHC running periods. The data sample corresponds to an integrated luminosity of 19.7 (35.9)fb−1 at s=8 (13) TeV. The expected and observed 95% confidence level upper limits on the product of the cross section and branching fraction into two photons are presented. The observed upper limit for the 2012 (2016) data set ranges from 129 (161) fb to 31 (26) fb. The statistical combination of the results from the analyses of the two data sets in the common mass range between 80 and 110 GeV yields an upper limit on the product of the cross section and branching fraction, normalized to that for a standard model-like Higgs boson, ranging from 0.7 to 0.2, with two notable exceptions: one in the region around the Z boson peak, where the limit rises to 1.1, which may be due to the presence of Drell–Yan dielectron production where electrons could be misidentified as isolated photons, and a second due to an observed excess with respect to the standard model prediction, which is maximal for a mass hypothesis of 95.3 GeV with a local (global) significance of 2.8 (1.3) standard deviations.Sirunyan, A.M.Thu, 02 May 2019 15:02:51 GMThttps://repo.scoap3.org/record/32566urn:ISSN:0370-2693Elsevier2019-05-20Search for vector-like quarks in events with two oppositely charged leptons and jets in proton–proton collisions at s=13Te
https://repo.scoap3.org/record/32538
A search for the pair production of heavy vector-like partners T and B of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton–proton collisions at s=13Te . The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9 fb-1 . Final states studied for TT¯ production include those where one of the T quarks decays via T→tZ and the other via T→bW , tZ , or tH , where H is a Higgs boson. For the BB¯ case, final states include those where one of the B quarks decays via B→bZ and the other B→tW , bZ , or bH . Events with two oppositely charged electrons or muons, consistent with coming from the decay of a Z boson, and jets are investigated. The number of observed events is consistent with standard model background estimations. Lower limits at 95% confidence level are placed on the masses of the T and B quarks for a range of branching fractions. Assuming 100% branching fractions for T→tZ , and B→bZ , T and B quark mass values below 1280 and 1130 Ge , respectively, are excluded.Sirunyan, A. M.Thu, 02 May 2019 14:59:43 GMThttps://repo.scoap3.org/record/32538urn:ISSN:1434-6052Springer/Società Italiana di Fisica2019-4-26