期刊
PHYSICAL REVIEW D
卷 84, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.84.052005
关键词
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资金
- DOE (USA)
- NSF (USA)
- CEA (France)
- CNRS/IN2P3 (France)
- FASI (Russia)
- Rosatom (Russia)
- RFBR (Russia)
- CNPq (Brazil)
- FAPERJ (Brazil)
- FAPESP (Brazil)
- FUNDUNESP (Brazil)
- DAE (India)
- DST (India)
- Colciencias (Colombia)
- CONACyT (Mexico)
- KRF (Korea)
- KOSEF (Korea)
- CONICET (Argentina)
- UBACyT (Argentina)
- FOM (The Netherlands)
- STFC (United Kingdom)
- Royal Society (United Kingdom)
- MSMT (Czech Republic)
- GACR (Czech Republic)
- CRC (Canada)
- NSERC (Canada)
- BMBF (Germany)
- DFG (Germany)
- SFI (Ireland)
- Swedish Research Council (Sweden)
- CAS (China)
- CNSF (China)
- ICREA Funding Source: Custom
- STFC [PP/E000487/1, ST/F00754X/1, ST/F007418/1, ST/H00095X/1, ST/J501074/1, ST/H00095X/2, ST/I505756/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H00095X/2, PP/E000487/1, ST/J501074/1, ST/H00095X/1, ST/F007418/1, ST/I505756/1, ST/F00754X/1, PP/D004284/1] Funding Source: researchfish
We present a direct measurement of the mass difference between top and antitop quarks (Delta m) in lepton + jets t (t) over bar final states using the matrix element method. The purity of the lepton + jets sample is enhanced for t (t) over bar events by identifying at least one of the jets as originating from a b quark. The analyzed data correspond to 3.6 fb(-1) of p (p) over bar collisions at root s = 1.96 TeV acquired by D0 in Run II of the Fermilab Tevatron Collider. The combination of the e + jets and mu + jets channels yields Delta m = 0.8 +/- 1.8(stat) +/- 0.5(syst) GeV, which is in agreement with the standard model expectation of no mass difference.
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